gcc/gcc.c

/* Compiler driver program that can handle many languages.
   Copyright (C) 1987, 89, 92-97, 1998 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

This paragraph is here to try to keep Sun CC from dying.
The number of chars here seems crucial!!!!  */

/* This program is the user interface to the C compiler and possibly to
other compilers.  It is used because compilation is a complicated procedure
which involves running several programs and passing temporary files between
them, forwarding the users switches to those programs selectively,
and deleting the temporary files at the end.

CC recognizes how to compile each input file by suffixes in the file names.
Once it knows which kind of compilation to perform, the procedure for
compilation is specified by a string called a "spec".  */

#include "config.h"

#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include "system.h"
#include <signal.h>
#include <sys/stat.h>

#include "gansidecl.h"
#include "obstack.h"


/* ??? Need to find a GCC header to put these in.  */
extern int pexecute PROTO ((const char *, char * const *, const char *,
			    const char *, char **, char **, int));
extern int pwait PROTO ((int, int *, int));
extern char *update_path PROTO((char *, char *));
extern void set_std_prefix PROTO((char *, int));
/* Flag arguments to pexecute.  */
#define PEXECUTE_FIRST   1
#define PEXECUTE_LAST    2
#define PEXECUTE_SEARCH  4
#define PEXECUTE_VERBOSE 8

#ifndef WIFSIGNALED
#define WIFSIGNALED(S) (((S) & 0xff) != 0 && ((S) & 0xff) != 0x7f)
#endif
#ifndef WTERMSIG
#define WTERMSIG(S) ((S) & 0x7f)
#endif
#ifndef WIFEXITED
#define WIFEXITED(S) (((S) & 0xff) == 0)
#endif
#ifndef WEXITSTATUS
#define WEXITSTATUS(S) (((S) & 0xff00) >> 8)
#endif

#ifdef VMS
#define exit __posix_exit
#endif

#ifdef USG
#define vfork fork
#endif /* USG */

/* Test if something is a normal file.  */
#ifndef S_ISREG
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif

/* Test if something is a directory.  */
#ifndef S_ISDIR
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

/* By default there is no special suffix for executables.  */
#ifdef EXECUTABLE_SUFFIX
#define HAVE_EXECUTABLE_SUFFIX
#else
#define EXECUTABLE_SUFFIX ""
#endif

/* By default, the suffix for object files is ".o".  */
#ifdef OBJECT_SUFFIX
#define HAVE_OBJECT_SUFFIX
#else
#define OBJECT_SUFFIX ".o"
#endif

/* By default, colon separates directories in a path.  */
#ifndef PATH_SEPARATOR
#define PATH_SEPARATOR ':'
#endif

#ifndef DIR_SEPARATOR
#define DIR_SEPARATOR '/'
#endif

static char dir_separator_str[] = {DIR_SEPARATOR, 0};

#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free

#ifndef GET_ENVIRONMENT
#define GET_ENVIRONMENT(ENV_VALUE,ENV_NAME) ENV_VALUE = getenv (ENV_NAME)
#endif

extern char *my_strerror PROTO((int));

#ifndef HAVE_KILL
#define kill(p,s) raise(s)
#endif

/* If a stage of compilation returns an exit status >= 1,
   compilation of that file ceases.  */

#define MIN_FATAL_STATUS 1

/* Flag saying to print the directories gcc will search through looking for
   programs, libraries, etc.  */

static int print_search_dirs;

/* Flag saying to print the full filename of this file
   as found through our usual search mechanism.  */

static char *print_file_name = NULL;

/* As print_file_name, but search for executable file.  */

static char *print_prog_name = NULL;

/* Flag saying to print the relative path we'd use to
   find libgcc.a given the current compiler flags.  */

static int print_multi_directory;

/* Flag saying to print the list of subdirectories and
   compiler flags used to select them in a standard form.  */

static int print_multi_lib;

/* Flag saying to print the command line options understood by gcc and its
   sub-processes.  */

static int print_help_list;

/* Flag indicating whether we should print the command and arguments */

static int verbose_flag;

/* Nonzero means write "temp" files in source directory
   and use the source file's name in them, and don't delete them.  */

static int save_temps_flag;

/* The compiler version.  */

static char *compiler_version;

/* The target version specified with -V */

static char *spec_version = DEFAULT_TARGET_VERSION;

/* The target machine specified with -b.  */

static char *spec_machine = DEFAULT_TARGET_MACHINE;

/* Nonzero if cross-compiling.
   When -b is used, the value comes from the `specs' file.  */

#ifdef CROSS_COMPILE
static char *cross_compile = "1";
#else
static char *cross_compile = "0";
#endif

/* The number of errors that have occurred; the link phase will not be
   run if this is non-zero.  */
static int error_count = 0;

/* This is the obstack which we use to allocate many strings.  */

static struct obstack obstack;

/* This is the obstack to build an environment variable to pass to
   collect2 that describes all of the relevant switches of what to
   pass the compiler in building the list of pointers to constructors
   and destructors.  */

static struct obstack collect_obstack;

extern char *version_string;

/* Forward declaration for prototypes.  */
struct path_prefix;

static void init_spec		PROTO((void));
static void read_specs		PROTO((char *, int));
static void set_spec		PROTO((char *, char *));
static struct compiler *lookup_compiler PROTO((char *, size_t, char *));
static char *build_search_list	PROTO((struct path_prefix *, char *, int));
static void putenv_from_prefixes PROTO((struct path_prefix *, char *));
static char *find_a_file	PROTO((struct path_prefix *, char *, int));
static void add_prefix		PROTO((struct path_prefix *, char *, char *,
				       int, int, int *));
static char *skip_whitespace	PROTO((char *));
static void record_temp_file	PROTO((char *, int, int));
static void delete_if_ordinary	PROTO((char *));
static void delete_temp_files	PROTO((void));
static void delete_failure_queue PROTO((void));
static void clear_failure_queue PROTO((void));
static int check_live_switch	PROTO((int, int));
static char *handle_braces	PROTO((char *));
static char *save_string	PROTO((char *, int));
static char *concat		PVPROTO((char *, ...));
extern int do_spec		PROTO((char *));
static int do_spec_1		PROTO((char *, int, char *));
static char *find_file		PROTO((char *));
static int is_directory		PROTO((char *, char *, int));
static void validate_switches	PROTO((char *));
static void validate_all_switches PROTO((void));
static void give_switch		PROTO((int, int, int));
static int used_arg		PROTO((char *, int));
static int default_arg		PROTO((char *, int));
static void set_multilib_dir	PROTO((void));
static void print_multilib_info	PROTO((void));
static void pfatal_with_name	PROTO((char *));
static void perror_with_name	PROTO((char *));
static void pfatal_pexecute	PROTO((char *, char *));
static void fatal		PVPROTO((char *, ...));
static void error		PVPROTO((char *, ...));
static void display_help 	PROTO((void));

void fancy_abort ();
char *xmalloc ();
char *xrealloc ();

#ifdef LANG_SPECIFIC_DRIVER
/* Called before processing to change/add/remove arguments. */
extern void lang_specific_driver PROTO ((void (*) PVPROTO((char *, ...)), int *, char ***, int *));

/* Called before linking.  Returns 0 on success and -1 on failure. */
extern int lang_specific_pre_link ();

/* Number of extra output files that lang_specific_pre_link may generate. */
extern int lang_specific_extra_outfiles;
#endif

/* Specs are strings containing lines, each of which (if not blank)
is made up of a program name, and arguments separated by spaces.
The program name must be exact and start from root, since no path
is searched and it is unreliable to depend on the current working directory.
Redirection of input or output is not supported; the subprograms must
accept filenames saying what files to read and write.

In addition, the specs can contain %-sequences to substitute variable text
or for conditional text.  Here is a table of all defined %-sequences.
Note that spaces are not generated automatically around the results of
expanding these sequences; therefore, you can concatenate them together
or with constant text in a single argument.

 %%	substitute one % into the program name or argument.
 %i     substitute the name of the input file being processed.
 %b     substitute the basename of the input file being processed.
	This is the substring up to (and not including) the last period
	and not including the directory.
 %gSUFFIX
	substitute a file name that has suffix SUFFIX and is chosen
	once per compilation, and mark the argument a la %d.  To reduce
	exposure to denial-of-service attacks, the file name is now
	chosen in a way that is hard to predict even when previously
	chosen file names are known.  For example, `%g.s ... %g.o ... %g.s'
	might turn into `ccUVUUAU.s ccXYAXZ12.o ccUVUUAU.s'.  SUFFIX matches
	the regexp "[.A-Za-z]*" or the special string "%O", which is
	treated exactly as if %O had been pre-processed.  Previously, %g
	was simply substituted with a file name chosen once per compilation,
	without regard to any appended suffix (which was therefore treated
	just like ordinary text), making such attacks more likely to succeed.
 %uSUFFIX
	like %g, but generates a new temporary file name even if %uSUFFIX
	was already seen.
 %USUFFIX
	substitutes the last file name generated with %uSUFFIX, generating a
	new one if there is no such last file name.  In the absence of any
	%uSUFFIX, this is just like %gSUFFIX, except they don't share
	the same suffix "space", so `%g.s ... %U.s ... %g.s ... %U.s'
	would involve the generation of two distinct file names, one
	for each `%g.s' and another for each `%U.s'.  Previously, %U was
	simply substituted with a file name chosen for the previous %u,
	without regard to any appended suffix.
 %d	marks the argument containing or following the %d as a
	temporary file name, so that that file will be deleted if CC exits
	successfully.  Unlike %g, this contributes no text to the argument.
 %w	marks the argument containing or following the %w as the
	"output file" of this compilation.  This puts the argument
	into the sequence of arguments that %o will substitute later.
 %W{...}
	like %{...} but mark last argument supplied within
	as a file to be deleted on failure.
 %o	substitutes the names of all the output files, with spaces
	automatically placed around them.  You should write spaces
	around the %o as well or the results are undefined.
	%o is for use in the specs for running the linker.
	Input files whose names have no recognized suffix are not compiled
	at all, but they are included among the output files, so they will
	be linked.
 %O	substitutes the suffix for object files.  Note that this is
	handled specially when it immediately follows %g, %u, or %U,
	because of the need for those to form complete file names.  The
	handling is such that %O is treated exactly as if it had already
	been substituted, except that %g, %u, and %U do not currently
	support additional SUFFIX characters following %O as they would
	following, for example, `.o'.
 %p	substitutes the standard macro predefinitions for the
	current target machine.  Use this when running cpp.
 %P	like %p, but puts `__' before and after the name of each macro.
	(Except macros that already have __.)
	This is for ANSI C.
 %I	Substitute a -iprefix option made from GCC_EXEC_PREFIX.
 %s     current argument is the name of a library or startup file of some sort.
        Search for that file in a standard list of directories
	and substitute the full name found.
 %eSTR  Print STR as an error message.  STR is terminated by a newline.
        Use this when inconsistent options are detected.
 %x{OPTION}	Accumulate an option for %X.
 %X	Output the accumulated linker options specified by compilations.
 %Y	Output the accumulated assembler options specified by compilations.
 %Z	Output the accumulated preprocessor options specified by compilations.
 %v1	Substitute the major version number of GCC.
	(For version 2.5.n, this is 2.)
 %v2	Substitute the minor version number of GCC.
	(For version 2.5.n, this is 5.)
 %a     process ASM_SPEC as a spec.
        This allows config.h to specify part of the spec for running as.
 %A	process ASM_FINAL_SPEC as a spec.  A capital A is actually
	used here.  This can be used to run a post-processor after the
	assembler has done its job.
 %D	Dump out a -L option for each directory in startfile_prefixes.
	If multilib_dir is set, extra entries are generated with it affixed.
 %l     process LINK_SPEC as a spec.
 %L     process LIB_SPEC as a spec.
 %G     process LIBGCC_SPEC as a spec.
 %S     process STARTFILE_SPEC as a spec.  A capital S is actually used here.
 %E     process ENDFILE_SPEC as a spec.  A capital E is actually used here.
 %c	process SIGNED_CHAR_SPEC as a spec.
 %C     process CPP_SPEC as a spec.  A capital C is actually used here.
 %1	process CC1_SPEC as a spec.
 %2	process CC1PLUS_SPEC as a spec.
 %|	output "-" if the input for the current command is coming from a pipe.
 %*	substitute the variable part of a matched option.  (See below.)
	Note that each comma in the substituted string is replaced by
	a single space.
 %{S}   substitutes the -S switch, if that switch was given to CC.
	If that switch was not specified, this substitutes nothing.
	Here S is a metasyntactic variable.
 %{S*}  substitutes all the switches specified to CC whose names start
	with -S.  This is used for -o, -D, -I, etc; switches that take
	arguments.  CC considers `-o foo' as being one switch whose
	name starts with `o'.  %{o*} would substitute this text,
	including the space; thus, two arguments would be generated.
 %{^S*} likewise, but don't put a blank between a switch and any args.
 %{S*:X} substitutes X if one or more switches whose names start with -S are
	specified to CC.  Note that the tail part of the -S option
	(i.e. the part matched by the `*') will be substituted for each
	occurrence of %* within X.
 %{S:X} substitutes X, but only if the -S switch was given to CC.
 %{!S:X} substitutes X, but only if the -S switch was NOT given to CC.
 %{|S:X} like %{S:X}, but if no S switch, substitute `-'.
 %{|!S:X} like %{!S:X}, but if there is an S switch, substitute `-'.
 %{.S:X} substitutes X, but only if processing a file with suffix S.
 %{!.S:X} substitutes X, but only if NOT processing a file with suffix S.
 %{S|P:X} substitutes X if either -S or -P was given to CC.  This may be
	  combined with ! and . as above binding stronger than the OR.
 %(Spec) processes a specification defined in a specs file as *Spec:
 %[Spec] as above, but put __ around -D arguments

The conditional text X in a %{S:X} or %{!S:X} construct may contain
other nested % constructs or spaces, or even newlines.  They are
processed as usual, as described above.

The -O, -f, -m, and -W switches are handled specifically in these
constructs.  If another value of -O or the negated form of a -f, -m, or
-W switch is found later in the command line, the earlier switch
value is ignored, except with {S*} where S is just one letter; this
passes all matching options.

The character | at the beginning of the predicate text is used to indicate
that a command should be piped to the following command, but only if -pipe
is specified.

Note that it is built into CC which switches take arguments and which
do not.  You might think it would be useful to generalize this to
allow each compiler's spec to say which switches take arguments.  But
this cannot be done in a consistent fashion.  CC cannot even decide
which input files have been specified without knowing which switches
take arguments, and it must know which input files to compile in order
to tell which compilers to run.

CC also knows implicitly that arguments starting in `-l' are to be
treated as compiler output files, and passed to the linker in their
proper position among the other output files.  */

/* Define the macros used for specs %a, %l, %L, %S, %c, %C, %1.  */

/* config.h can define ASM_SPEC to provide extra args to the assembler
   or extra switch-translations.  */
#ifndef ASM_SPEC
#define ASM_SPEC ""
#endif

/* config.h can define ASM_FINAL_SPEC to run a post processor after
   the assembler has run.  */
#ifndef ASM_FINAL_SPEC
#define ASM_FINAL_SPEC ""
#endif

/* config.h can define CPP_SPEC to provide extra args to the C preprocessor
   or extra switch-translations.  */
#ifndef CPP_SPEC
#define CPP_SPEC ""
#endif

/* config.h can define CC1_SPEC to provide extra args to cc1 and cc1plus
   or extra switch-translations.  */
#ifndef CC1_SPEC
#define CC1_SPEC ""
#endif

/* config.h can define CC1PLUS_SPEC to provide extra args to cc1plus
   or extra switch-translations.  */
#ifndef CC1PLUS_SPEC
#define CC1PLUS_SPEC ""
#endif

/* config.h can define LINK_SPEC to provide extra args to the linker
   or extra switch-translations.  */
#ifndef LINK_SPEC
#define LINK_SPEC ""
#endif

/* config.h can define LIB_SPEC to override the default libraries.  */
#ifndef LIB_SPEC
#define LIB_SPEC "%{!shared:%{g*:-lg} %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}"
#endif

/* config.h can define LIBGCC_SPEC to override how and when libgcc.a is
   included.  */
#ifndef LIBGCC_SPEC
#if defined(LINK_LIBGCC_SPECIAL) || defined(LINK_LIBGCC_SPECIAL_1)
/* Have gcc do the search for libgcc.a.  */
#define LIBGCC_SPEC "libgcc.a%s"
#else
#define LIBGCC_SPEC "-lgcc"
#endif
#endif

/* config.h can define STARTFILE_SPEC to override the default crt0 files.  */
#ifndef STARTFILE_SPEC
#define STARTFILE_SPEC  \
  "%{!shared:%{pg:gcrt0%O%s}%{!pg:%{p:mcrt0%O%s}%{!p:crt0%O%s}}}"
#endif

/* config.h can define SWITCHES_NEED_SPACES to control which options
   require spaces between the option and the argument.  */
#ifndef SWITCHES_NEED_SPACES
#define SWITCHES_NEED_SPACES ""
#endif

/* config.h can define ENDFILE_SPEC to override the default crtn files.  */
#ifndef ENDFILE_SPEC
#define ENDFILE_SPEC ""
#endif

/* This spec is used for telling cpp whether char is signed or not.  */
#ifndef SIGNED_CHAR_SPEC
/* Use #if rather than ?:
   because MIPS C compiler rejects like ?: in initializers.  */
#if DEFAULT_SIGNED_CHAR
#define SIGNED_CHAR_SPEC "%{funsigned-char:-D__CHAR_UNSIGNED__}"
#else
#define SIGNED_CHAR_SPEC "%{!fsigned-char:-D__CHAR_UNSIGNED__}"
#endif
#endif

#ifndef LINKER_NAME
#define LINKER_NAME "collect2"
#endif

static char *cpp_spec = CPP_SPEC;
static char *cpp_predefines = CPP_PREDEFINES;
static char *cc1_spec = CC1_SPEC;
static char *cc1plus_spec = CC1PLUS_SPEC;
static char *signed_char_spec = SIGNED_CHAR_SPEC;
static char *asm_spec = ASM_SPEC;
static char *asm_final_spec = ASM_FINAL_SPEC;
static char *link_spec = LINK_SPEC;
static char *lib_spec = LIB_SPEC;
static char *libgcc_spec = LIBGCC_SPEC;
static char *endfile_spec = ENDFILE_SPEC;
static char *startfile_spec = STARTFILE_SPEC;
static char *switches_need_spaces = SWITCHES_NEED_SPACES;
static char *linker_name_spec = LINKER_NAME;

/* Some compilers have limits on line lengths, and the multilib_select
   and/or multilib_matches strings can be very long, so we build them at
   run time.  */
static struct obstack multilib_obstack;
static char *multilib_select;
static char *multilib_matches;
static char *multilib_defaults;
#include "multilib.h"

/* Check whether a particular argument is a default argument.  */

#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS { "" }
#endif

static char *multilib_defaults_raw[] = MULTILIB_DEFAULTS;

struct user_specs {
  struct user_specs *next;
  char *filename;
};

static struct user_specs *user_specs_head, *user_specs_tail;

/* This defines which switch letters take arguments.  */

#define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
  ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
   || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
   || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
   || (CHAR) == 'L' || (CHAR) == 'A' || (CHAR) == 'V' \
   || (CHAR) == 'B' || (CHAR) == 'b')

#ifndef SWITCH_TAKES_ARG
#define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
#endif

/* This defines which multi-letter switches take arguments.  */

#define DEFAULT_WORD_SWITCH_TAKES_ARG(STR)		\
 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext")	\
  || !strcmp (STR, "Tbss") || !strcmp (STR, "include")	\
  || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
  || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
  || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
  || !strcmp (STR, "isystem") || !strcmp (STR, "specs"))

#ifndef WORD_SWITCH_TAKES_ARG
#define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
#endif


#ifdef HAVE_EXECUTABLE_SUFFIX
/* This defines which switches stop a full compilation.  */
#define DEFAULT_SWITCH_CURTAILS_COMPILATION(CHAR) \
  ((CHAR) == 'c' || (CHAR) == 'S')

#ifndef SWITCH_CURTAILS_COMPILATION
#define SWITCH_CURTAILS_COMPILATION(CHAR) \
  DEFAULT_SWITCH_CURTAILS_COMPILATION(CHAR)
#endif
#endif

/* Record the mapping from file suffixes for compilation specs.  */

struct compiler
{
  char *suffix;			/* Use this compiler for input files
				   whose names end in this suffix.  */

  char *spec[4];		/* To use this compiler, concatenate these
				   specs and pass to do_spec.  */
};

/* Pointer to a vector of `struct compiler' that gives the spec for
   compiling a file, based on its suffix.
   A file that does not end in any of these suffixes will be passed
   unchanged to the loader and nothing else will be done to it.

   An entry containing two 0s is used to terminate the vector.

   If multiple entries match a file, the last matching one is used.  */

static struct compiler *compilers;

/* Number of entries in `compilers', not counting the null terminator.  */

static int n_compilers;

/* The default list of file name suffixes and their compilation specs.  */

static struct compiler default_compilers[] =
{
  /* Add lists of suffixes of known languages here.  If those languages
     were not present when we built the driver, we will hit these copies
     and be given a more meaningful error than "file not used since
     linking is not done".  */
  {".cc", {"#C++"}}, {".cxx", {"#C++"}}, {".cpp", {"#C++"}}, {".c++", {"#C++"}},
  {".C", {"#C++"}}, {".ads", {"#Ada"}}, {".adb", {"#Ada"}}, {".ada", {"#Ada"}},
  {".f", {"#Fortran"}}, {".for", {"#Fortran"}}, {".F", {"#Fortran"}},
  {".fpp", {"#Fortran"}},
  {".p", {"#Pascal"}}, {".pas", {"#Pascal"}},
  /* Next come the entries for C.  */
  {".c", {"@c"}},
  {"@c",
   {
#if USE_CPPLIB
     "%{E|M|MM:cpp -lang-c%{ansi:89} %{nostdinc*} %{C} %{v} %{A*} %{I*} %{P} %I\
	%{C:%{!E:%eGNU C does not support -C without using -E}}\
	%{M} %{MM} %{MD:-MD %b.d} %{MMD:-MMD %b.d} %{MG}\
        -undef -D__GNUC__=%v1 -D__GNUC_MINOR__=%v2\
	%{ansi:-trigraphs -D__STRICT_ANSI__}\
	%{!undef:%{!ansi:%p} %P} %{trigraphs} \
        %c %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
        %{traditional} %{ftraditional:-traditional}\
        %{traditional-cpp:-traditional}\
	%{g*} %{W*} %{w} %{pedantic*} %{H} %{d*} %C %{D*} %{U*} %{i*} %Z\
        %i %{E:%W{o*}}%{M:%W{o*}}%{MM:%W{o*}}\n}\
      %{!E:%{!M:%{!MM:cc1 %i %1 \
                  -lang-c%{ansi:89} %{nostdinc*} %{A*} %{I*} %I\
                  %{!Q:-quiet} -dumpbase %b.c %{d*} %{m*} %{a*}\
                  %{MD:-MD %b.d} %{MMD:-MMD %b.d} %{MG}\
                  -undef -D__GNUC__=%v1 -D__GNUC_MINOR__=%v2\
                  %{ansi:-trigraphs -D__STRICT_ANSI__}\
                  %{!undef:%{!ansi:%p} %P} %{trigraphs} \
                  %c %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
                  %{H} %C %{D*} %{U*} %{i*} %Z\
                  %{ftraditional:-traditional}\
                  %{traditional-cpp:-traditional}\
		  %{traditional} %{v:-version} %{pg:-p} %{p} %{f*}\
		  %{aux-info*}\
		  %{--help:--help} \
		  %{g*} %{O*} %{W*} %{w} %{pedantic*} %{ansi} \
		  %{pg:%{fomit-frame-pointer:%e-pg and -fomit-frame-pointer are incompatible}}\
		  %{S:%W{o*}%{!o*:-o %b.s}}%{!S:-o %{|!pipe:%g.s}} |\n\
                  %{!S:as %a %Y\
		     %{c:%W{o*}%{!o*:-o %w%b%O}}%{!c:-o %d%w%u%O}\
                     %{!pipe:%g.s} %A\n }}}}"
  }},
#else /* ! USE_CPPLIB */
    "cpp -lang-c%{ansi:89} %{nostdinc*} %{C} %{v} %{A*} %{I*} %{P} %I\
	%{C:%{!E:%eGNU C does not support -C without using -E}}\
	%{M} %{MM} %{MD:-MD %b.d} %{MMD:-MMD %b.d} %{MG}\
        -undef -D__GNUC__=%v1 -D__GNUC_MINOR__=%v2\
	%{ansi:-trigraphs -D__STRICT_ANSI__}\
	%{!undef:%{!ansi:%p} %P} %{trigraphs} \
        %c %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
        %{traditional} %{ftraditional:-traditional}\
        %{traditional-cpp:-traditional}\
	%{g*} %{W*} %{w} %{pedantic*} %{H} %{d*} %C %{D*} %{U*} %{i*} %Z\
        %i %{!M:%{!MM:%{!E:%{!pipe:%g.i}}}}%{E:%W{o*}}%{M:%W{o*}}%{MM:%W{o*}} |\n",
   "%{!M:%{!MM:%{!E:cc1 %{!pipe:%g.i} %1 \
		   %{!Q:-quiet} -dumpbase %b.c %{d*} %{m*} %{a*}\
		   %{g*} %{O*} %{W*} %{w} %{pedantic*} %{ansi} \
		   %{traditional} %{v:-version} %{pg:-p} %{p} %{f*}\
		   %{aux-info*}\
		   %{--help:--help} \
		   %{pg:%{fomit-frame-pointer:%e-pg and -fomit-frame-pointer are incompatible}}\
		   %{S:%W{o*}%{!o*:-o %b.s}}%{!S:-o %{|!pipe:%g.s}} |\n\
              %{!S:as %a %Y\
		      %{c:%W{o*}%{!o*:-o %w%b%O}}%{!c:-o %d%w%u%O}\
                      %{!pipe:%g.s} %A\n }}}}"
  }},
#endif /* ! USE_CPPLIB */
  {"-",
   {"%{E:cpp -lang-c%{ansi:89} %{nostdinc*} %{C} %{v} %{A*} %{I*} %{P} %I\
	%{C:%{!E:%eGNU C does not support -C without using -E}}\
	%{M} %{MM} %{MD:-MD %b.d} %{MMD:-MMD %b.d} %{MG}\
        -undef -D__GNUC__=%v1 -D__GNUC_MINOR__=%v2\
	%{ansi:-trigraphs -D__STRICT_ANSI__}\
	%{!undef:%{!ansi:%p} %P} %{trigraphs}\
        %c %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
        %{traditional} %{ftraditional:-traditional}\
        %{traditional-cpp:-traditional}\
	%{g*} %{W*} %{w} %{pedantic*} %{H} %{d*} %C %{D*} %{U*} %{i*} %Z\
        %i %W{o*}}\
    %{!E:%e-E required when input is from standard input}"}},
  {".m", {"@objective-c"}},
  {"@objective-c",
   {"cpp -lang-objc %{nostdinc*} %{C} %{v} %{A*} %{I*} %{P} %I\
	%{C:%{!E:%eGNU C does not support -C without using -E}}\
	%{M} %{MM} %{MD:-MD %b.d} %{MMD:-MMD %b.d} %{MG}\
        -undef -D__OBJC__ -D__GNUC__=%v1 -D__GNUC_MINOR__=%v2\
	 %{ansi:-trigraphs -D__STRICT_ANSI__}\
	%{!undef:%{!ansi:%p} %P} %{trigraphs}\
        %c %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
        %{traditional} %{ftraditional:-traditional}\
        %{traditional-cpp:-traditional}\
	%{g*} %{W*} %{w} %{pedantic*} %{H} %{d*} %C %{D*} %{U*} %{i*} %Z\
        %i %{!M:%{!MM:%{!E:%{!pipe:%g.i}}}}%{E:%W{o*}}%{M:%W{o*}}%{MM:%W{o*}} |\n",
    "%{!M:%{!MM:%{!E:cc1obj %{!pipe:%g.i} %1 \
		   %{!Q:-quiet} -dumpbase %b.m %{d*} %{m*} %{a*}\
		   %{g*} %{O*} %{W*} %{w} %{pedantic*} %{ansi} \
		   %{traditional} %{v:-version} %{pg:-p} %{p} %{f*} \
    		   -lang-objc %{gen-decls} \
		   %{aux-info*}\
		   %{pg:%{fomit-frame-pointer:%e-pg and -fomit-frame-pointer are incompatible}}\
		   %{S:%W{o*}%{!o*:-o %b.s}}%{!S:-o %{|!pipe:%g.s}} |\n\
              %{!S:as %a %Y\
		      %{c:%W{o*}%{!o*:-o %w%b%O}}%{!c:-o %d%w%u%O}\
                      %{!pipe:%g.s} %A\n }}}}"}},
  {".h", {"@c-header"}},
  {"@c-header",
   {"%{!E:%eCompilation of header file requested} \
    cpp %{nostdinc*} %{C} %{v} %{A*} %{I*} %{P} %I\
	%{C:%{!E:%eGNU C does not support -C without using -E}}\
	 %{M} %{MM} %{MD:-MD %b.d} %{MMD:-MMD %b.d} %{MG}\
        -undef -D__GNUC__=%v1 -D__GNUC_MINOR__=%v2\
	 %{ansi:-trigraphs -D__STRICT_ANSI__}\
	%{!undef:%{!ansi:%p} %P} %{trigraphs}\
        %c %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
        %{traditional} %{ftraditional:-traditional}\
        %{traditional-cpp:-traditional}\
	%{g*} %{W*} %{w} %{pedantic*} %{H} %{d*} %C %{D*} %{U*} %{i*} %Z\
        %i %W{o*}"}},
  {".i", {"@cpp-output"}},
  {"@cpp-output",
   {"%{!M:%{!MM:%{!E:cc1 %i %1 %{!Q:-quiet} %{d*} %{m*} %{a*}\
			%{g*} %{O*} %{W*} %{w} %{pedantic*} %{ansi}\
			%{traditional} %{v:-version} %{pg:-p} %{p} %{f*}\
			%{aux-info*}\
			%{pg:%{fomit-frame-pointer:%e-pg and -fomit-frame-pointer are incompatible}}\
			%{S:%W{o*}%{!o*:-o %b.s}}%{!S:-o %{|!pipe:%g.s}} |\n\
		     %{!S:as %a %Y\
			     %{c:%W{o*}%{!o*:-o %w%b%O}}%{!c:-o %d%w%u%O}\
			     %{!pipe:%g.s} %A\n }}}}"}},
  {".s", {"@assembler"}},
  {"@assembler",
   {"%{!M:%{!MM:%{!E:%{!S:as %a %Y\
		            %{c:%W{o*}%{!o*:-o %w%b%O}}%{!c:-o %d%w%u%O}\
			    %i %A\n }}}}"}},
  {".S", {"@assembler-with-cpp"}},
  {"@assembler-with-cpp",
   {"cpp -lang-asm %{nostdinc*} %{C} %{v} %{A*} %{I*} %{P} %I\
	%{C:%{!E:%eGNU C does not support -C without using -E}}\
	%{M} %{MM} %{MD:-MD %b.d} %{MMD:-MMD %b.d} %{MG} %{trigraphs}\
        -undef -$ %{!undef:%p %P} -D__ASSEMBLER__ \
        %c %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
        %{traditional} %{ftraditional:-traditional}\
        %{traditional-cpp:-traditional}\
	%{g*} %{W*} %{w} %{pedantic*} %{H} %{d*} %C %{D*} %{U*} %{i*} %Z\
        %i %{!M:%{!MM:%{!E:%{!pipe:%g.s}}}}%{E:%W{o*}}%{M:%W{o*}}%{MM:%W{o*}} |\n",
    "%{!M:%{!MM:%{!E:%{!S:as %a %Y\
                    %{c:%W{o*}%{!o*:-o %w%b%O}}%{!c:-o %d%w%u%O}\
		    %{!pipe:%g.s} %A\n }}}}"}},
#include "specs.h"
  /* Mark end of table */
  {0, {0}}
};

/* Number of elements in default_compilers, not counting the terminator.  */

static int n_default_compilers
  = (sizeof default_compilers / sizeof (struct compiler)) - 1;

/* Here is the spec for running the linker, after compiling all files.  */

/* -u* was put back because both BSD and SysV seem to support it.  */
/* %{static:} simply prevents an error message if the target machine
   doesn't handle -static.  */
/* We want %{T*} after %{L*} and %D so that it can be used to specify linker
   scripts which exist in user specified directories, or in standard
   directories.  */
#ifdef LINK_COMMAND_SPEC
/* Provide option to override link_command_spec from machine specific
   configuration files.  */
static char *link_command_spec = 
	LINK_COMMAND_SPEC;
#else
#ifdef LINK_LIBGCC_SPECIAL
/* Don't generate -L options.  */
static char *link_command_spec = "\
%{!fsyntax-only: \
 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
			%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
			%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
			%{static:} %{L*} %o\
			%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
			%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
			%{T*}\
			\n }}}}}}";
#else
/* Use -L.  */
static char *link_command_spec = "\
%{!fsyntax-only: \
 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
			%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
			%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
			%{static:} %{L*} %D %o\
			%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
			%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
			%{T*}\
			\n }}}}}}";
#endif
#endif

/* A vector of options to give to the linker.
   These options are accumulated by %x,
   and substituted into the linker command with %X.  */
static int n_linker_options;
static char **linker_options;

/* A vector of options to give to the assembler.
   These options are accumulated by -Wa,
   and substituted into the assembler command with %Y.  */
static int n_assembler_options;
static char **assembler_options;

/* A vector of options to give to the preprocessor.
   These options are accumulated by -Wp,
   and substituted into the preprocessor command with %Z.  */
static int n_preprocessor_options;
static char **preprocessor_options;

/* Define how to map long options into short ones.  */

/* This structure describes one mapping.  */
struct option_map
{
  /* The long option's name.  */
  char *name;
  /* The equivalent short option.  */
  char *equivalent;
  /* Argument info.  A string of flag chars; NULL equals no options.
     a => argument required.
     o => argument optional.
     j => join argument to equivalent, making one word.
     * => require other text after NAME as an argument.  */
  char *arg_info;
};

/* This is the table of mappings.  Mappings are tried sequentially
   for each option encountered; the first one that matches, wins.  */

struct option_map option_map[] =
 {
   {"--all-warnings", "-Wall", 0},
   {"--ansi", "-ansi", 0},
   {"--assemble", "-S", 0},
   {"--assert", "-A", "a"},
   {"--comments", "-C", 0},
   {"--compile", "-c", 0},
   {"--debug", "-g", "oj"},
   {"--define-macro", "-D", "aj"},
   {"--dependencies", "-M", 0},
   {"--dump", "-d", "a"},
   {"--dumpbase", "-dumpbase", "a"},
   {"--entry", "-e", 0},
   {"--extra-warnings", "-W", 0},
   {"--for-assembler", "-Wa", "a"},
   {"--for-linker", "-Xlinker", "a"},
   {"--force-link", "-u", "a"},
   {"--imacros", "-imacros", "a"},
   {"--include", "-include", "a"},
   {"--include-barrier", "-I-", 0},
   {"--include-directory", "-I", "aj"},
   {"--include-directory-after", "-idirafter", "a"},
   {"--include-prefix", "-iprefix", "a"},
   {"--include-with-prefix", "-iwithprefix", "a"},
   {"--include-with-prefix-before", "-iwithprefixbefore", "a"},
   {"--include-with-prefix-after", "-iwithprefix", "a"},
   {"--language", "-x", "a"},
   {"--library-directory", "-L", "a"},
   {"--machine", "-m", "aj"},
   {"--machine-", "-m", "*j"},
   {"--no-line-commands", "-P", 0},
   {"--no-precompiled-includes", "-noprecomp", 0},
   {"--no-standard-includes", "-nostdinc", 0},
   {"--no-standard-libraries", "-nostdlib", 0},
   {"--no-warnings", "-w", 0},
   {"--optimize", "-O", "oj"},
   {"--output", "-o", "a"},
   {"--pedantic", "-pedantic", 0},
   {"--pedantic-errors", "-pedantic-errors", 0},
   {"--pipe", "-pipe", 0},
   {"--prefix", "-B", "a"},
   {"--preprocess", "-E", 0},
   {"--print-search-dirs", "-print-search-dirs", 0},
   {"--print-file-name", "-print-file-name=", "aj"},
   {"--print-libgcc-file-name", "-print-libgcc-file-name", 0},
   {"--print-missing-file-dependencies", "-MG", 0},
   {"--print-multi-lib", "-print-multi-lib", 0},
   {"--print-multi-directory", "-print-multi-directory", 0},
   {"--print-prog-name", "-print-prog-name=", "aj"},
   {"--profile", "-p", 0},
   {"--profile-blocks", "-a", 0},
   {"--quiet", "-q", 0},
   {"--save-temps", "-save-temps", 0},
   {"--shared", "-shared", 0},
   {"--silent", "-q", 0},
   {"--specs", "-specs=", "aj"},
   {"--static", "-static", 0},
   {"--symbolic", "-symbolic", 0},
   {"--target", "-b", "a"},
   {"--trace-includes", "-H", 0},
   {"--traditional", "-traditional", 0},
   {"--traditional-cpp", "-traditional-cpp", 0},
   {"--trigraphs", "-trigraphs", 0},
   {"--undefine-macro", "-U", "aj"},
   {"--use-version", "-V", "a"},
   {"--user-dependencies", "-MM", 0},
   {"--verbose", "-v", 0},
   {"--version", "-dumpversion", 0},
   {"--warn-", "-W", "*j"},
   {"--write-dependencies", "-MD", 0},
   {"--write-user-dependencies", "-MMD", 0},
   {"--", "-f", "*j"}
 };

/* Translate the options described by *ARGCP and *ARGVP.
   Make a new vector and store it back in *ARGVP,
   and store its length in *ARGVC.  */

static void
translate_options (argcp, argvp)
     int *argcp;
     char ***argvp;
{
  int i, j, k;
  int argc = *argcp;
  char **argv = *argvp;
  char **newv = (char **) xmalloc ((argc + 2) * 2 * sizeof (char *));
  int newindex = 0;

  i = 0;
  newv[newindex++] = argv[i++];

  while (i < argc)
    {
      /* Translate -- options.  */
      if (argv[i][0] == '-' && argv[i][1] == '-')
	{
	  /* Find a mapping that applies to this option.  */
	  for (j = 0; j < sizeof (option_map) / sizeof (option_map[0]); j++)
	    {
	      size_t optlen = strlen (option_map[j].name);
	      size_t arglen = strlen (argv[i]);
	      size_t complen = arglen > optlen ? optlen : arglen;
	      char *arginfo = option_map[j].arg_info;

	      if (arginfo == 0)
		arginfo = "";

	      if (!strncmp (argv[i], option_map[j].name, complen))
		{
		  char *arg = 0;

		  if (arglen < optlen)
		    {
		      for (k = j + 1;
			   k < sizeof (option_map) / sizeof (option_map[0]);
			   k++)
			if (strlen (option_map[k].name) >= arglen
			    && !strncmp (argv[i], option_map[k].name, arglen))
			  {
			    error ("Ambiguous abbreviation %s", argv[i]);
			    break;
			  }

		      if (k != sizeof (option_map) / sizeof (option_map[0]))
			break;
		    }

		  if (arglen > optlen)
		    {
		      /* If the option has an argument, accept that.  */
		      if (argv[i][optlen] == '=')
			arg = argv[i] + optlen + 1;

		      /* If this mapping requires extra text at end of name,
			 accept that as "argument".  */
		      else if (index (arginfo, '*') != 0)
			arg = argv[i] + optlen;

		      /* Otherwise, extra text at end means mismatch.
			 Try other mappings.  */
		      else
			continue;
		    }

		  else if (index (arginfo, '*') != 0)
		    {
		      error ("Incomplete `%s' option", option_map[j].name);
		      break;
		    }

		  /* Handle arguments.  */
		  if (index (arginfo, 'a') != 0)
		    {
		      if (arg == 0)
			{
			  if (i + 1 == argc)
			    {
			      error ("Missing argument to `%s' option",
				     option_map[j].name);
			      break;
			    }

			  arg = argv[++i];
			}
		    }
		  else if (index (arginfo, '*') != 0)
		    ;
		  else if (index (arginfo, 'o') == 0)
		    {
		      if (arg != 0)
			error ("Extraneous argument to `%s' option",
			       option_map[j].name);
		      arg = 0;
		    }

		  /* Store the translation as one argv elt or as two.  */
		  if (arg != 0 && index (arginfo, 'j') != 0)
		    newv[newindex++] = concat (option_map[j].equivalent, arg,
					       NULL_PTR);
		  else if (arg != 0)
		    {
		      newv[newindex++] = option_map[j].equivalent;
		      newv[newindex++] = arg;
		    }
		  else
		    newv[newindex++] = option_map[j].equivalent;

		  break;
		}
	    }
	  i++;
	}

      /* Handle old-fashioned options--just copy them through,
	 with their arguments.  */
      else if (argv[i][0] == '-')
	{
	  char *p = argv[i] + 1;
	  int c = *p;
	  int nskip = 1;

	  if (SWITCH_TAKES_ARG (c) > (p[1] != 0))
	    nskip += SWITCH_TAKES_ARG (c) - (p[1] != 0);
	  else if (WORD_SWITCH_TAKES_ARG (p))
	    nskip += WORD_SWITCH_TAKES_ARG (p);
	  else if ((c == 'B' || c == 'b' || c == 'V' || c == 'x')
		   && p[1] == 0)
	    nskip += 1;
	  else if (! strcmp (p, "Xlinker"))
	    nskip += 1;

	  /* Watch out for an option at the end of the command line that
	     is missing arguments, and avoid skipping past the end of the
	     command line.  */
	  if (nskip + i > argc)
	    nskip = argc - i;

	  while (nskip > 0)
	    {
	      newv[newindex++] = argv[i++];
	      nskip--;
	    }
	}
      else
	/* Ordinary operands, or +e options.  */
	newv[newindex++] = argv[i++];
    }

  newv[newindex] = 0;

  *argvp = newv;
  *argcp = newindex;
}

char *
my_strerror(e)
     int e;
{
#ifdef HAVE_STRERROR

  return strerror(e);

#else

  static char buffer[30];
  if (!e)
    return "cannot access";

  if (e > 0 && e < sys_nerr)
    return sys_errlist[e];

  sprintf (buffer, "Unknown error %d", e);
  return buffer;
#endif
}

static char *
skip_whitespace (p)
     char *p;
{
  while (1)
    {
      /* A fully-blank line is a delimiter in the SPEC file and shouldn't
	 be considered whitespace.  */
      if (p[0] == '\n' && p[1] == '\n' && p[2] == '\n')
	return p + 1;
      else if (*p == '\n' || *p == ' ' || *p == '\t')
	p++;
      else if (*p == '#')
	{
	  while (*p != '\n') p++;
	  p++;
	}
      else
	break;
    }

  return p;
}

/* Structure to keep track of the specs that have been defined so far.
   These are accessed using %(specname) or %[specname] in a compiler
   or link spec.  */

struct spec_list
{
				/* The following 2 fields must be first */
				/* to allow EXTRA_SPECS to be initialized */
  char *name;			/* name of the spec.  */
  char *ptr;			/* available ptr if no static pointer */

				/* The following fields are not initialized */
				/* by EXTRA_SPECS */
  char **ptr_spec;		/* pointer to the spec itself.  */
  struct spec_list *next;	/* Next spec in linked list.  */
  int name_len;			/* length of the name */
  int alloc_p;			/* whether string was allocated */
};

#define INIT_STATIC_SPEC(NAME,PTR) \
{ NAME, NULL_PTR, PTR, (struct spec_list *)0, sizeof (NAME)-1, 0 }

/* List of statically defined specs */
static struct spec_list static_specs[] = {
  INIT_STATIC_SPEC ("asm",			&asm_spec),
  INIT_STATIC_SPEC ("asm_final",		&asm_final_spec),
  INIT_STATIC_SPEC ("cpp",			&cpp_spec),
  INIT_STATIC_SPEC ("cc1",			&cc1_spec),
  INIT_STATIC_SPEC ("cc1plus",			&cc1plus_spec),
  INIT_STATIC_SPEC ("endfile",			&endfile_spec),
  INIT_STATIC_SPEC ("link",			&link_spec),
  INIT_STATIC_SPEC ("lib",			&lib_spec),
  INIT_STATIC_SPEC ("libgcc",			&libgcc_spec),
  INIT_STATIC_SPEC ("startfile",		&startfile_spec),
  INIT_STATIC_SPEC ("switches_need_spaces",	&switches_need_spaces),
  INIT_STATIC_SPEC ("signed_char",		&signed_char_spec),
  INIT_STATIC_SPEC ("predefines",		&cpp_predefines),
  INIT_STATIC_SPEC ("cross_compile",		&cross_compile),
  INIT_STATIC_SPEC ("version",			&compiler_version),
  INIT_STATIC_SPEC ("multilib",			&multilib_select),
  INIT_STATIC_SPEC ("multilib_defaults",	&multilib_defaults),
  INIT_STATIC_SPEC ("multilib_extra",		&multilib_extra),
  INIT_STATIC_SPEC ("multilib_matches",		&multilib_matches),
  INIT_STATIC_SPEC ("linker",			&linker_name_spec),
};

#ifdef EXTRA_SPECS		/* additional specs needed */
static struct spec_list extra_specs[] = { EXTRA_SPECS };
#endif

/* List of dynamically allocates specs that have been defined so far.  */

static struct spec_list *specs = (struct spec_list *)0;


/* Initialize the specs lookup routines.  */

static void
init_spec ()
{
  struct spec_list *next = (struct spec_list *)0;
  struct spec_list *sl   = (struct spec_list *)0;
  int i;

  if (specs)
    return;			/* already initialized */

  if (verbose_flag)
    fprintf (stderr, "Using builtin specs.\n");

#ifdef EXTRA_SPECS
  for (i = (sizeof (extra_specs) / sizeof (extra_specs[0])) - 1; i >= 0; i--)
    {
      sl = &extra_specs[i];
      sl->next = next;
      sl->name_len = strlen (sl->name);
      sl->ptr_spec = &sl->ptr;
      next = sl;
    }
#endif

  for (i = (sizeof (static_specs) / sizeof (static_specs[0])) - 1; i >= 0; i--)
    {
      sl = &static_specs[i];
      sl->next = next;
      next = sl;
    }

  specs = sl;
}


/* Change the value of spec NAME to SPEC.  If SPEC is empty, then the spec is
   removed; If the spec starts with a + then SPEC is added to the end of the
   current spec.  */

static void
set_spec (name, spec)
     char *name;
     char *spec;
{
  struct spec_list *sl;
  char *old_spec;
  int name_len = strlen (name);
  int i;

  /* If this is the first call, initialize the statically allocated specs */
  if (!specs)
    {
      struct spec_list *next = (struct spec_list *)0;
      for (i = (sizeof (static_specs) / sizeof (static_specs[0])) - 1;
	   i >= 0; i--)
	{
	  sl = &static_specs[i];
	  sl->next = next;
	  next = sl;
	}
      specs = sl;
    }

  /* See if the spec already exists */
  for (sl = specs; sl; sl = sl->next)
    if (name_len == sl->name_len && !strcmp (sl->name, name))
      break;

  if (!sl)
    {
      /* Not found - make it */
      sl = (struct spec_list *) xmalloc (sizeof (struct spec_list));
      sl->name = save_string (name, strlen (name));
      sl->name_len = name_len;
      sl->ptr_spec = &sl->ptr;
      sl->alloc_p = 0;
      *(sl->ptr_spec) = "";
      sl->next = specs;
      specs = sl;
    }

  old_spec = *(sl->ptr_spec);
  *(sl->ptr_spec) = ((spec[0] == '+' && ISSPACE (spec[1]))
		     ? concat (old_spec, spec + 1, NULL_PTR)
		     : save_string (spec, strlen (spec)));

#ifdef DEBUG_SPECS
  if (verbose_flag)
    fprintf (stderr, "Setting spec %s to '%s'\n\n", name, *(sl->ptr_spec));
#endif

  /* Free the old spec */
  if (old_spec && sl->alloc_p)
    free (old_spec);

  sl->alloc_p = 1;
}

/* Accumulate a command (program name and args), and run it.  */

/* Vector of pointers to arguments in the current line of specifications.  */

static char **argbuf;

/* Number of elements allocated in argbuf.  */

static int argbuf_length;

/* Number of elements in argbuf currently in use (containing args).  */

static int argbuf_index;

/* We want this on by default all the time now.  */
#define MKTEMP_EACH_FILE

#ifdef MKTEMP_EACH_FILE

extern char *make_temp_file PROTO((char *));

/* This is the list of suffixes and codes (%g/%u/%U) and the associated
   temp file.  */

static struct temp_name {
  char *suffix;		/* suffix associated with the code.  */
  int length;		/* strlen (suffix).  */
  int unique;		/* Indicates whether %g or %u/%U was used.  */
  char *filename;	/* associated filename.  */
  int filename_length;	/* strlen (filename).  */
  struct temp_name *next;
} *temp_names;
#else
extern char *choose_temp_base PROTO((void));
#endif


/* Number of commands executed so far.  */

static int execution_count;

/* Number of commands that exited with a signal.  */

static int signal_count;

/* Name with which this program was invoked.  */

static char *programname;

/* Structures to keep track of prefixes to try when looking for files.  */

struct prefix_list
{
  char *prefix;               /* String to prepend to the path.  */
  struct prefix_list *next;   /* Next in linked list.  */
  int require_machine_suffix; /* Don't use without machine_suffix.  */
  /* 2 means try both machine_suffix and just_machine_suffix.  */
  int *used_flag_ptr;	      /* 1 if a file was found with this prefix.  */
};

struct path_prefix
{
  struct prefix_list *plist;  /* List of prefixes to try */
  int max_len;                /* Max length of a prefix in PLIST */
  char *name;                 /* Name of this list (used in config stuff) */
};

/* List of prefixes to try when looking for executables.  */

static struct path_prefix exec_prefixes = { 0, 0, "exec" };

/* List of prefixes to try when looking for startup (crt0) files.  */

static struct path_prefix startfile_prefixes = { 0, 0, "startfile" };

/* List of prefixes to try when looking for include files.  */

static struct path_prefix include_prefixes = { 0, 0, "include" };

/* Suffix to attach to directories searched for commands.
   This looks like `MACHINE/VERSION/'.  */

static char *machine_suffix = 0;

/* Suffix to attach to directories searched for commands.
   This is just `MACHINE/'.  */

static char *just_machine_suffix = 0;

/* Adjusted value of GCC_EXEC_PREFIX envvar.  */

static char *gcc_exec_prefix;

/* Default prefixes to attach to command names.  */

#ifdef CROSS_COMPILE  /* Don't use these prefixes for a cross compiler.  */
#undef MD_EXEC_PREFIX
#undef MD_STARTFILE_PREFIX
#undef MD_STARTFILE_PREFIX_1
#endif

#ifndef STANDARD_EXEC_PREFIX
#define STANDARD_EXEC_PREFIX "/usr/local/lib/gcc-lib/"
#endif /* !defined STANDARD_EXEC_PREFIX */

static char *standard_exec_prefix = STANDARD_EXEC_PREFIX;
static char *standard_exec_prefix_1 = "/usr/lib/gcc/";
#ifdef MD_EXEC_PREFIX
static char *md_exec_prefix = MD_EXEC_PREFIX;
#endif

#ifndef STANDARD_STARTFILE_PREFIX
#define STANDARD_STARTFILE_PREFIX "/usr/local/lib/"
#endif /* !defined STANDARD_STARTFILE_PREFIX */

#ifdef MD_STARTFILE_PREFIX
static char *md_startfile_prefix = MD_STARTFILE_PREFIX;
#endif
#ifdef MD_STARTFILE_PREFIX_1
static char *md_startfile_prefix_1 = MD_STARTFILE_PREFIX_1;
#endif
static char *standard_startfile_prefix = STANDARD_STARTFILE_PREFIX;
static char *standard_startfile_prefix_1 = "/lib/";
static char *standard_startfile_prefix_2 = "/usr/lib/";

#ifndef TOOLDIR_BASE_PREFIX
#define TOOLDIR_BASE_PREFIX "/usr/local/"
#endif
static char *tooldir_base_prefix = TOOLDIR_BASE_PREFIX;
static char *tooldir_prefix;

/* Subdirectory to use for locating libraries.  Set by
   set_multilib_dir based on the compilation options.  */

static char *multilib_dir;

/* Clear out the vector of arguments (after a command is executed).  */

static void
clear_args ()
{
  argbuf_index = 0;
}

/* Add one argument to the vector at the end.
   This is done when a space is seen or at the end of the line.
   If DELETE_ALWAYS is nonzero, the arg is a filename
    and the file should be deleted eventually.
   If DELETE_FAILURE is nonzero, the arg is a filename
    and the file should be deleted if this compilation fails.  */

static void
store_arg (arg, delete_always, delete_failure)
     char *arg;
     int delete_always, delete_failure;
{
  if (argbuf_index + 1 == argbuf_length)
    argbuf
      = (char **) xrealloc (argbuf, (argbuf_length *= 2) * sizeof (char *));

  argbuf[argbuf_index++] = arg;
  argbuf[argbuf_index] = 0;

  if (delete_always || delete_failure)
    record_temp_file (arg, delete_always, delete_failure);
}

/* Read compilation specs from a file named FILENAME,
   replacing the default ones.

   A suffix which starts with `*' is a definition for
   one of the machine-specific sub-specs.  The "suffix" should be
   *asm, *cc1, *cpp, *link, *startfile, *signed_char, etc.
   The corresponding spec is stored in asm_spec, etc.,
   rather than in the `compilers' vector.

   Anything invalid in the file is a fatal error.  */

static void
read_specs (filename, main_p)
     char *filename;
     int main_p;
{
  int desc;
  int readlen;
  struct stat statbuf;
  char *buffer;
  register char *p;

  if (verbose_flag)
    fprintf (stderr, "Reading specs from %s\n", filename);

  /* Open and stat the file.  */
  desc = open (filename, O_RDONLY, 0);
  if (desc < 0)
    pfatal_with_name (filename);
  if (stat (filename, &statbuf) < 0)
    pfatal_with_name (filename);

  /* Read contents of file into BUFFER.  */
  buffer = xmalloc ((unsigned) statbuf.st_size + 1);
  readlen = read (desc, buffer, (unsigned) statbuf.st_size);
  if (readlen < 0)
    pfatal_with_name (filename);
  buffer[readlen] = 0;
  close (desc);

  /* Scan BUFFER for specs, putting them in the vector.  */
  p = buffer;
  while (1)
    {
      char *suffix;
      char *spec;
      char *in, *out, *p1, *p2, *p3;

      /* Advance P in BUFFER to the next nonblank nocomment line.  */
      p = skip_whitespace (p);
      if (*p == 0)
	break;

      /* Is this a special command that starts with '%'? */
      /* Don't allow this for the main specs file, since it would
	 encourage people to overwrite it.  */
      if (*p == '%' && !main_p)
	{
	  p1 = p;
	  while (*p && *p != '\n')
	    p++;

	  p++;			/* Skip '\n' */

	  if (!strncmp (p1, "%include", sizeof ("%include")-1)
	      && (p1[sizeof "%include" - 1] == ' '
		  || p1[sizeof "%include" - 1] == '\t'))
	    {
	      char *new_filename;

	      p1 += sizeof ("%include");
	      while (*p1 == ' ' || *p1 == '\t')
		p1++;

	      if (*p1++ != '<' || p[-2] != '>')
		fatal ("specs %%include syntax malformed after %d characters",
		       p1 - buffer + 1);

	      p[-2] = '\0';
	      new_filename = find_a_file (&startfile_prefixes, p1, R_OK);
	      read_specs (new_filename ? new_filename : p1, FALSE);
	      continue;
	    }
	  else if (!strncmp (p1, "%include_noerr", sizeof "%include_noerr" - 1)
		   && (p1[sizeof "%include_noerr" - 1] == ' '
		       || p1[sizeof "%include_noerr" - 1] == '\t'))
	    {
	      char *new_filename;

	      p1 += sizeof "%include_noerr";
	      while (*p1 == ' ' || *p1 == '\t') p1++;

	      if (*p1++ != '<' || p[-2] != '>')
		fatal ("specs %%include syntax malformed after %d characters",
		       p1 - buffer + 1);

	      p[-2] = '\0';
	      new_filename = find_a_file (&startfile_prefixes, p1, R_OK);
	      if (new_filename)
		read_specs (new_filename, FALSE);
	      else if (verbose_flag)
		fprintf (stderr, "Could not find specs file %s\n", p1);
	      continue;
	    }
	  else if (!strncmp (p1, "%rename", sizeof "%rename" - 1)
		   && (p1[sizeof "%rename" - 1] == ' '
		       || p1[sizeof "%rename" - 1] == '\t'))
	    {
	      int name_len;
	      struct spec_list *sl;

	      /* Get original name */
	      p1 += sizeof "%rename";
	      while (*p1 == ' ' || *p1 == '\t')
		p1++;

	      if (! ISALPHA (*p1))
		fatal ("specs %%rename syntax malformed after %d characters",
		       p1 - buffer);

	      p2 = p1;
	      while (*p2 && !ISSPACE (*p2))
		p2++;

	      if (*p2 != ' ' && *p2 != '\t')
		fatal ("specs %%rename syntax malformed after %d characters",
		       p2 - buffer);

	      name_len = p2 - p1;
	      *p2++ = '\0';
	      while (*p2 == ' ' || *p2 == '\t')
		p2++;

	      if (! ISALPHA (*p2))
		fatal ("specs %%rename syntax malformed after %d characters",
		       p2 - buffer);

	      /* Get new spec name */
	      p3 = p2;
	      while (*p3 && !ISSPACE (*p3))
		p3++;

	      if (p3 != p-1)
		fatal ("specs %%rename syntax malformed after %d characters",
		       p3 - buffer);
	      *p3 = '\0';

	      for (sl = specs; sl; sl = sl->next)
		if (name_len == sl->name_len && !strcmp (sl->name, p1))
		  break;

	      if (!sl)
		fatal ("specs %s spec was not found to be renamed", p1);

	      if (strcmp (p1, p2) == 0)
		continue;

	      if (verbose_flag)
		{
		  fprintf (stderr, "rename spec %s to %s\n", p1, p2);
#ifdef DEBUG_SPECS
		  fprintf (stderr, "spec is '%s'\n\n", *(sl->ptr_spec));
#endif
		}

	      set_spec (p2, *(sl->ptr_spec));
	      if (sl->alloc_p)
		free (*(sl->ptr_spec));

	      *(sl->ptr_spec) = "";
	      sl->alloc_p = 0;
	      continue;
	    }
	  else
	    fatal ("specs unknown %% command after %d characters",
		   p1 - buffer);
	}

      /* Find the colon that should end the suffix.  */
      p1 = p;
      while (*p1 && *p1 != ':' && *p1 != '\n')
	p1++;

      /* The colon shouldn't be missing.  */
      if (*p1 != ':')
	fatal ("specs file malformed after %d characters", p1 - buffer);

      /* Skip back over trailing whitespace.  */
      p2 = p1;
      while (p2 > buffer && (p2[-1] == ' ' || p2[-1] == '\t'))
	p2--;

      /* Copy the suffix to a string.  */
      suffix = save_string (p, p2 - p);
      /* Find the next line.  */
      p = skip_whitespace (p1 + 1);
      if (p[1] == 0)
	fatal ("specs file malformed after %d characters", p - buffer);

      p1 = p;
      /* Find next blank line or end of string.  */
      while (*p1 && !(*p1 == '\n' && (p1[1] == '\n' || p1[1] == '\0')))
	p1++;

      /* Specs end at the blank line and do not include the newline.  */
      spec = save_string (p, p1 - p);
      p = p1;

      /* Delete backslash-newline sequences from the spec.  */
      in = spec;
      out = spec;
      while (*in != 0)
	{
	  if (in[0] == '\\' && in[1] == '\n')
	    in += 2;
	  else if (in[0] == '#')
	    while (*in && *in != '\n')
	      in++;

	  else
	    *out++ = *in++;
	}
      *out = 0;

      if (suffix[0] == '*')
	{
	  if (! strcmp (suffix, "*link_command"))
	    link_command_spec = spec;
	  else
	    set_spec (suffix + 1, spec);
	}
      else
	{
	  /* Add this pair to the vector.  */
	  compilers
	    = ((struct compiler *)
	       xrealloc (compilers,
			 (n_compilers + 2) * sizeof (struct compiler)));

	  compilers[n_compilers].suffix = suffix;
	  bzero ((char *) compilers[n_compilers].spec,
		 sizeof compilers[n_compilers].spec);
	  compilers[n_compilers].spec[0] = spec;
	  n_compilers++;
	  bzero ((char *) &compilers[n_compilers],
		 sizeof compilers[n_compilers]);
	}

      if (*suffix == 0)
	link_command_spec = spec;
    }

  if (link_command_spec == 0)
    fatal ("spec file has no spec for linking");
}

/* Record the names of temporary files we tell compilers to write,
   and delete them at the end of the run.  */

/* This is the common prefix we use to make temp file names.
   It is chosen once for each run of this program.
   It is substituted into a spec by %g.
   Thus, all temp file names contain this prefix.
   In practice, all temp file names start with this prefix.

   This prefix comes from the envvar TMPDIR if it is defined;
   otherwise, from the P_tmpdir macro if that is defined;
   otherwise, in /usr/tmp or /tmp;
   or finally the current directory if all else fails.  */

static char *temp_filename;

/* Length of the prefix.  */

static int temp_filename_length;

/* Define the list of temporary files to delete.  */

struct temp_file
{
  char *name;
  struct temp_file *next;
};

/* Queue of files to delete on success or failure of compilation.  */
static struct temp_file *always_delete_queue;
/* Queue of files to delete on failure of compilation.  */
static struct temp_file *failure_delete_queue;

/* Record FILENAME as a file to be deleted automatically.
   ALWAYS_DELETE nonzero means delete it if all compilation succeeds;
   otherwise delete it in any case.
   FAIL_DELETE nonzero means delete it if a compilation step fails;
   otherwise delete it in any case.  */

static void
record_temp_file (filename, always_delete, fail_delete)
     char *filename;
     int always_delete;
     int fail_delete;
{
  register char *name;
  name = xmalloc (strlen (filename) + 1);
  strcpy (name, filename);

  if (always_delete)
    {
      register struct temp_file *temp;
      for (temp = always_delete_queue; temp; temp = temp->next)
	if (! strcmp (name, temp->name))
	  goto already1;

      temp = (struct temp_file *) xmalloc (sizeof (struct temp_file));
      temp->next = always_delete_queue;
      temp->name = name;
      always_delete_queue = temp;

    already1:;
    }

  if (fail_delete)
    {
      register struct temp_file *temp;
      for (temp = failure_delete_queue; temp; temp = temp->next)
	if (! strcmp (name, temp->name))
	  goto already2;

      temp = (struct temp_file *) xmalloc (sizeof (struct temp_file));
      temp->next = failure_delete_queue;
      temp->name = name;
      failure_delete_queue = temp;

    already2:;
    }
}

/* Delete all the temporary files whose names we previously recorded.  */

static void
delete_if_ordinary (name)
     char *name;
{
  struct stat st;
#ifdef DEBUG
  int i, c;

  printf ("Delete %s? (y or n) ", name);
  fflush (stdout);
  i = getchar ();
  if (i != '\n')
    while ((c = getchar ()) != '\n' && c != EOF)
      ;

  if (i == 'y' || i == 'Y')
#endif /* DEBUG */
    if (stat (name, &st) >= 0 && S_ISREG (st.st_mode))
      if (unlink (name) < 0)
	if (verbose_flag)
	  perror_with_name (name);
}

static void
delete_temp_files ()
{
  register struct temp_file *temp;

  for (temp = always_delete_queue; temp; temp = temp->next)
    delete_if_ordinary (temp->name);
  always_delete_queue = 0;
}

/* Delete all the files to be deleted on error.  */

static void
delete_failure_queue ()
{
  register struct temp_file *temp;

  for (temp = failure_delete_queue; temp; temp = temp->next)
    delete_if_ordinary (temp->name);
}

static void
clear_failure_queue ()
{
  failure_delete_queue = 0;
}

/* Routine to add variables to the environment.  We do this to pass
   the pathname of the gcc driver, and the directories search to the
   collect2 program, which is being run as ld.  This way, we can be
   sure of executing the right compiler when collect2 wants to build
   constructors and destructors.  Since the environment variables we
   use come from an obstack, we don't have to worry about allocating
   space for them.  */

#ifndef HAVE_PUTENV

void
putenv (str)
     char *str;
{
#ifndef VMS			/* nor about VMS */

  extern char **environ;
  char **old_environ = environ;
  char **envp;
  int num_envs = 0;
  int name_len = 1;
  int str_len = strlen (str);
  char *p = str;
  int ch;

  while ((ch = *p++) != '\0' && ch != '=')
    name_len++;

  if (!ch)
    abort ();

  /* Search for replacing an existing environment variable, and
     count the number of total environment variables.  */
  for (envp = old_environ; *envp; envp++)
    {
      num_envs++;
      if (!strncmp (str, *envp, name_len))
	{
	  *envp = str;
	  return;
	}
    }

  /* Add a new environment variable */
  environ = (char **) xmalloc (sizeof (char *) * (num_envs+2));
  *environ = str;
  bcopy ((char *) old_environ, (char *) (environ + 1),
	 sizeof (char *) * (num_envs+1));

#endif	/* VMS */
}

#endif	/* HAVE_PUTENV */


/* Build a list of search directories from PATHS.
   PREFIX is a string to prepend to the list.
   If CHECK_DIR_P is non-zero we ensure the directory exists.
   This is used mostly by putenv_from_prefixes so we use `collect_obstack'.
   It is also used by the --print-search-dirs flag.  */

static char *
build_search_list (paths, prefix, check_dir_p)
     struct path_prefix *paths;
     char *prefix;
     int check_dir_p;
{
  int suffix_len = (machine_suffix) ? strlen (machine_suffix) : 0;
  int just_suffix_len
    = (just_machine_suffix) ? strlen (just_machine_suffix) : 0;
  int first_time = TRUE;
  struct prefix_list *pprefix;

  obstack_grow (&collect_obstack, prefix, strlen (prefix));

  for (pprefix = paths->plist; pprefix != 0; pprefix = pprefix->next)
    {
      int len = strlen (pprefix->prefix);

      if (machine_suffix
	  && (! check_dir_p
	      || is_directory (pprefix->prefix, machine_suffix, 0)))
	{
	  if (!first_time)
	    obstack_1grow (&collect_obstack, PATH_SEPARATOR);
	    
	  first_time = FALSE;
	  obstack_grow (&collect_obstack, pprefix->prefix, len);
	  obstack_grow (&collect_obstack, machine_suffix, suffix_len);
	}

      if (just_machine_suffix
	  && pprefix->require_machine_suffix == 2
	  && (! check_dir_p
	      || is_directory (pprefix->prefix, just_machine_suffix, 0)))
	{
	  if (! first_time)
	    obstack_1grow (&collect_obstack, PATH_SEPARATOR);
	    
	  first_time = FALSE;
	  obstack_grow (&collect_obstack, pprefix->prefix, len);
	  obstack_grow (&collect_obstack, just_machine_suffix,
			just_suffix_len);
	}

      if (! pprefix->require_machine_suffix)
	{
	  if (! first_time)
	    obstack_1grow (&collect_obstack, PATH_SEPARATOR);

	  first_time = FALSE;
	  obstack_grow (&collect_obstack, pprefix->prefix, len);
	}
    }

  obstack_1grow (&collect_obstack, '\0');
  return obstack_finish (&collect_obstack);
}

/* Rebuild the COMPILER_PATH and LIBRARY_PATH environment variables
   for collect.  */

static void
putenv_from_prefixes (paths, env_var)
     struct path_prefix *paths;
     char *env_var;
{
  putenv (build_search_list (paths, env_var, 1));
}

/* Search for NAME using the prefix list PREFIXES.  MODE is passed to
   access to check permissions.
   Return 0 if not found, otherwise return its name, allocated with malloc.  */

static char *
find_a_file (pprefix, name, mode)
     struct path_prefix *pprefix;
     char *name;
     int mode;
{
  char *temp;
  char *file_suffix = ((mode & X_OK) != 0 ? EXECUTABLE_SUFFIX : "");
  struct prefix_list *pl;
  int len = pprefix->max_len + strlen (name) + strlen (file_suffix) + 1;

  if (machine_suffix)
    len += strlen (machine_suffix);

  temp = xmalloc (len);

  /* Determine the filename to execute (special case for absolute paths).  */

  if (*name == '/' || *name == DIR_SEPARATOR
      /* Check for disk name on MS-DOS-based systems.  */
      || (DIR_SEPARATOR == '\\' && name[1] == ':'
	  && (name[2] == DIR_SEPARATOR || name[2] == '/')))
    {
      if (access (name, mode))
	{
	  strcpy (temp, name);
	  return temp;
	}
    }
  else
    for (pl = pprefix->plist; pl; pl = pl->next)
      {
	if (machine_suffix)
	  {
	    /* Some systems have a suffix for executable files.
	       So try appending that first.  */
	    if (file_suffix[0] != 0)
	      {
		strcpy (temp, pl->prefix);
		strcat (temp, machine_suffix);
		strcat (temp, name);
		strcat (temp, file_suffix);
		if (access (temp, mode) == 0)
		  {
		    if (pl->used_flag_ptr != 0)
		      *pl->used_flag_ptr = 1;
		    return temp;
		  }
	      }

	    /* Now try just the name.  */
	    strcpy (temp, pl->prefix);
	    strcat (temp, machine_suffix);
	    strcat (temp, name);
	    if (access (temp, mode) == 0)
	      {
		if (pl->used_flag_ptr != 0)
		  *pl->used_flag_ptr = 1;
		return temp;
	      }
	  }

	/* Certain prefixes are tried with just the machine type,
	   not the version.  This is used for finding as, ld, etc.  */
	if (just_machine_suffix && pl->require_machine_suffix == 2)
	  {
	    /* Some systems have a suffix for executable files.
	       So try appending that first.  */
	    if (file_suffix[0] != 0)
	      {
		strcpy (temp, pl->prefix);
		strcat (temp, just_machine_suffix);
		strcat (temp, name);
		strcat (temp, file_suffix);
		if (access (temp, mode) == 0)
		  {
		    if (pl->used_flag_ptr != 0)
		      *pl->used_flag_ptr = 1;
		    return temp;
		  }
	      }

	    strcpy (temp, pl->prefix);
	    strcat (temp, just_machine_suffix);
	    strcat (temp, name);
	    if (access (temp, mode) == 0)
	      {
		if (pl->used_flag_ptr != 0)
		  *pl->used_flag_ptr = 1;
		return temp;
	      }
	  }

	/* Certain prefixes can't be used without the machine suffix
	   when the machine or version is explicitly specified.  */
	if (! pl->require_machine_suffix)
	  {
	    /* Some systems have a suffix for executable files.
	       So try appending that first.  */
	    if (file_suffix[0] != 0)
	      {
		strcpy (temp, pl->prefix);
		strcat (temp, name);
		strcat (temp, file_suffix);
		if (access (temp, mode) == 0)
		  {
		    if (pl->used_flag_ptr != 0)
		      *pl->used_flag_ptr = 1;
		    return temp;
		  }
	      }

	    strcpy (temp, pl->prefix);
	    strcat (temp, name);
	    if (access (temp, mode) == 0)
	      {
		if (pl->used_flag_ptr != 0)
		  *pl->used_flag_ptr = 1;
		return temp;
	      }
	  }
      }

  free (temp);
  return 0;
}

/* Add an entry for PREFIX in PLIST.  If FIRST is set, it goes
   at the start of the list, otherwise it goes at the end.

   If WARN is nonzero, we will warn if no file is found
   through this prefix.  WARN should point to an int
   which will be set to 1 if this entry is used.

   COMPONENT is the value to be passed to update_path.

   REQUIRE_MACHINE_SUFFIX is 1 if this prefix can't be used without
   the complete value of machine_suffix.
   2 means try both machine_suffix and just_machine_suffix.  */

static void
add_prefix (pprefix, prefix, component, first, require_machine_suffix, warn)
     struct path_prefix *pprefix;
     char *prefix;
     char *component;
     int first;
     int require_machine_suffix;
     int *warn;
{
  struct prefix_list *pl, **prev;
  int len;

  if (! first && pprefix->plist)
    {
      for (pl = pprefix->plist; pl->next; pl = pl->next)
	;
      prev = &pl->next;
    }
  else
    prev = &pprefix->plist;

  /* Keep track of the longest prefix */

  prefix = update_path (prefix, component);
  len = strlen (prefix);
  if (len > pprefix->max_len)
    pprefix->max_len = len;

  pl = (struct prefix_list *) xmalloc (sizeof (struct prefix_list));
  pl->prefix = save_string (prefix, len);
  pl->require_machine_suffix = require_machine_suffix;
  pl->used_flag_ptr = warn;
  if (warn)
    *warn = 0;

  if (*prev)
    pl->next = *prev;
  else
    pl->next = (struct prefix_list *) 0;
  *prev = pl;
}

/* Print warnings for any prefixes in the list PPREFIX that were not used.  */

static void
unused_prefix_warnings (pprefix)
     struct path_prefix *pprefix;
{
  struct prefix_list *pl = pprefix->plist;

  while (pl)
    {
      if (pl->used_flag_ptr != 0 && !*pl->used_flag_ptr)
	{
	  if (pl->require_machine_suffix && machine_suffix)
	    error ("file path prefix `%s%s' never used", pl->prefix,
		   machine_suffix);
	  else
	    error ("file path prefix `%s' never used", pl->prefix);

	  /* Prevent duplicate warnings.  */
	  *pl->used_flag_ptr = 1;
	}

      pl = pl->next;
    }
}


/* Execute the command specified by the arguments on the current line of spec.
   When using pipes, this includes several piped-together commands
   with `|' between them.

   Return 0 if successful, -1 if failed.  */

static int
execute ()
{
  int i;
  int n_commands;		/* # of command.  */
  char *string;
  struct command
    {
      char *prog;		/* program name.  */
      char **argv;		/* vector of args.  */
      int pid;			/* pid of process for this command.  */
    };

  struct command *commands;	/* each command buffer with above info.  */

  /* Count # of piped commands.  */
  for (n_commands = 1, i = 0; i < argbuf_index; i++)
    if (strcmp (argbuf[i], "|") == 0)
      n_commands++;

  /* Get storage for each command.  */
  commands
    = (struct command *) alloca (n_commands * sizeof (struct command));

  /* Split argbuf into its separate piped processes,
     and record info about each one.
     Also search for the programs that are to be run.  */

  commands[0].prog = argbuf[0]; /* first command.  */
  commands[0].argv = &argbuf[0];
  string = find_a_file (&exec_prefixes, commands[0].prog, X_OK);

  if (string)
    commands[0].argv[0] = string;

  for (n_commands = 1, i = 0; i < argbuf_index; i++)
    if (strcmp (argbuf[i], "|") == 0)
      {				/* each command.  */
#if defined (__MSDOS__) || (defined (_WIN32) && defined (__CYGWIN32_)) || defined (OS2) || defined (VMS)
        fatal ("-pipe not supported");
#endif
	argbuf[i] = 0;	/* termination of command args.  */
	commands[n_commands].prog = argbuf[i + 1];
	commands[n_commands].argv = &argbuf[i + 1];
	string = find_a_file (&exec_prefixes, commands[n_commands].prog, X_OK);
	if (string)
	  commands[n_commands].argv[0] = string;
	n_commands++;
      }

  argbuf[argbuf_index] = 0;

  /* If -v, print what we are about to do, and maybe query.  */

  if (verbose_flag)
    {
      /* For help listings, put a blank line between sub-processes.  */
      if (print_help_list)
	fputc ('\n', stderr);
      
      /* Print each piped command as a separate line.  */
      for (i = 0; i < n_commands ; i++)
	{
	  char **j;

	  for (j = commands[i].argv; *j; j++)
	    fprintf (stderr, " %s", *j);

	  /* Print a pipe symbol after all but the last command.  */
	  if (i + 1 != n_commands)
	    fprintf (stderr, " |");
	  fprintf (stderr, "\n");
	}
      fflush (stderr);
#ifdef DEBUG
      fprintf (stderr, "\nGo ahead? (y or n) ");
      fflush (stderr);
      i = getchar ();
      if (i != '\n')
	while (getchar () != '\n')
	  ;

      if (i != 'y' && i != 'Y')
	return 0;
#endif /* DEBUG */
    }

  /* Run each piped subprocess.  */

  for (i = 0; i < n_commands; i++)
    {
      char *errmsg_fmt, *errmsg_arg;
      char *string = commands[i].argv[0];

      commands[i].pid = pexecute (string, commands[i].argv,
				  programname, temp_filename,
				  &errmsg_fmt, &errmsg_arg,
				  ((i == 0 ? PEXECUTE_FIRST : 0)
				   | (i + 1 == n_commands ? PEXECUTE_LAST : 0)
				   | (string == commands[i].prog
				      ? PEXECUTE_SEARCH : 0)
				   | (verbose_flag ? PEXECUTE_VERBOSE : 0)));

      if (commands[i].pid == -1)
	pfatal_pexecute (errmsg_fmt, errmsg_arg);

      if (string != commands[i].prog)
	free (string);
    }

  execution_count++;

  /* Wait for all the subprocesses to finish.
     We don't care what order they finish in;
     we know that N_COMMANDS waits will get them all.
     Ignore subprocesses that we don't know about,
     since they can be spawned by the process that exec'ed us.  */

  {
    int ret_code = 0;

    for (i = 0; i < n_commands; )
      {
	int j;
	int status;
	int pid;

	pid = pwait (commands[i].pid, &status, 0);
	if (pid < 0)
	  abort ();

	for (j = 0; j < n_commands; j++)
	  if (commands[j].pid == pid)
	    {
	      i++;
	      if (status != 0)
		{
		  if (WIFSIGNALED (status))
		    {
		      fatal ("Internal compiler error: program %s got fatal signal %d",
			     commands[j].prog, WTERMSIG (status));
		      signal_count++;
		      ret_code = -1;
		    }
		  else if (WIFEXITED (status)
			   && WEXITSTATUS (status) >= MIN_FATAL_STATUS)
		    ret_code = -1;
		}
	      break;
	    }
      }
    return ret_code;
  }
}

/* Find all the switches given to us
   and make a vector describing them.
   The elements of the vector are strings, one per switch given.
   If a switch uses following arguments, then the `part1' field
   is the switch itself and the `args' field
   is a null-terminated vector containing the following arguments.
   The `live_cond' field is 1 if the switch is true in a conditional spec,
   -1 if false (overridden by a later switch), and is initialized to zero.
   The `valid' field is nonzero if any spec has looked at this switch;
   if it remains zero at the end of the run, it must be meaningless.  */

struct switchstr
{
  char *part1;
  char **args;
  int live_cond;
  int valid;
};

static struct switchstr *switches;

static int n_switches;

struct infile
{
  char *name;
  char *language;
};

/* Also a vector of input files specified.  */

static struct infile *infiles;

static int n_infiles;

/* This counts the number of libraries added by LANG_SPECIFIC_DRIVER, so that
   we can tell if there were any user supplied any files or libraries.  */

static int added_libraries;

/* And a vector of corresponding output files is made up later.  */

static char **outfiles;

/* Used to track if none of the -B paths are used.  */
static int warn_B;

/* Used to track if standard path isn't used and -b or -V is specified.  */
static int warn_std;

/* Gives value to pass as "warn" to add_prefix for standard prefixes.  */
static int *warn_std_ptr = 0;


#if defined(HAVE_OBJECT_SUFFIX) || defined(HAVE_EXECUTABLE_SUFFIX)

/* Convert NAME to a new name if it is the standard suffix.  DO_EXE
   is true if we should look for an executable suffix as well.  */

static char *
convert_filename (name, do_exe)
     char *name;
     int do_exe;
{
  int i;
  int len = strlen (name);

#ifdef HAVE_OBJECT_SUFFIX
  /* Convert x.o to x.obj if OBJECT_SUFFIX is ".obj".  */
  if (len > 2
      && name[len - 2] == '.'
      && name[len - 1] == 'o')
    {
      obstack_grow (&obstack, name, len - 2);
      obstack_grow0 (&obstack, OBJECT_SUFFIX, strlen (OBJECT_SUFFIX));
      name = obstack_finish (&obstack);
    }
#endif

#ifdef HAVE_EXECUTABLE_SUFFIX
  /* If there is no filetype, make it the executable suffix (which includes
     the ".").  But don't get confused if we have just "-o".  */
  if (! do_exe || EXECUTABLE_SUFFIX[0] == 0 || (len == 2 && name[0] == '-'))
    return name;

  for (i = len - 1; i >= 0; i--)
    if (name[i] == '/' || name[i] == DIR_SEPARATOR)
      break;

  for (i++; i < len; i++)
    if (name[i] == '.')
      return name;

  obstack_grow (&obstack, name, len);
  obstack_grow0 (&obstack, EXECUTABLE_SUFFIX, strlen (EXECUTABLE_SUFFIX));
  name = obstack_finish (&obstack);
#endif

  return name;
}
#endif

/* Display the command line switches accepted by gcc.  */
static void
display_help ()
{
  printf ("Usage: %s [options] file...\n", programname);
  printf ("Options:\n");

  printf ("  --help                   Display this information\n");
  if (! verbose_flag)
    printf ("  (Use '-v --help' to display command line options of sub-processes)\n");
  printf ("  -dumpspecs               Display all of the built in spec strings\n");
  printf ("  -dumpversion             Display the version of the compiler\n");
  printf ("  -dumpmachine             Display the compiler's target processor\n");
  printf ("  -print-search-dirs       Display the directories in the compiler's search path\n");
  printf ("  -print-libgcc-file-name  Display the name of the compiler's companion library\n");
  printf ("  -print-file-name=<lib>   Display the full path to library <lib>\n");
  printf ("  -print-prog-name=<prog>  Display the full path to compiler component <prog>\n");
  printf ("  -print-multi-directory   Display the root directory for versions of libgcc\n");
  printf ("  -print-multi-lib         Display the mapping between command line options and\n");
  printf ("                            multiple library search directories\n");
  printf ("  -Wa,<options>            Pass comma-separated <options> on to the assembler\n");
  printf ("  -Wp,<options>            Pass comma-separated <options> on to the preprocessor\n");
  printf ("  -Wl,<options>            Pass comma-separated <options> on to the linker\n");
  printf ("  -Xlinker <arg>           Pass <arg> on to the linker\n");
  printf ("  -save-temps              Do not delete intermediate files\n");
  printf ("  -pipe                    Use pipes rather than intermediate files\n");
  printf ("  -specs=<file>            Override builtin specs with the contents of <file>\n");
  printf ("  -B <directory>           Add <directory> to the compiler's search paths\n");
  printf ("  -b <machine>             Run gcc for target <machine>, if installed\n");
  printf ("  -V <version>             Run gcc version number <version>, if installed\n");
  printf ("  -v                       Display the programs invoked by the compiler\n");
  printf ("  -E                       Preprocess only; do not compile, assemble or link\n");
  printf ("  -S                       Compile only; do not assemble or link\n");
  printf ("  -c                       Compile and assemble, but do not link\n");
  printf ("  -o <file>                Place the output into <file>\n");
  printf ("  -x <language>            Specify the language of the following input files\n");
  printf ("                            Permissable languages include: c c++ assembler none\n");
  printf ("                            'none' means revert to the default behaviour of\n");
  printf ("                            guessing the language based on the file's extension\n");

  printf ("\nOptions starting with -g, -f, -m, -O or -W are automatically passed on to\n");
  printf ("the various sub-processes invoked by %s.  In order to pass other options\n",
	  programname);
  printf ("on to these processes the -W<letter> options must be used.\n");

  /* The rest of the options are displayed by invocations of the various
     sub-processes.  */
}

static void 								
add_preprocessor_option (option, len)					
     char * option;							
     int    len;							
{									
  n_preprocessor_options++;							
									
  if (! preprocessor_options)						
    preprocessor_options							
      = (char **) xmalloc (n_preprocessor_options * sizeof (char **));	
  else									
    preprocessor_options							
      = (char **) xrealloc (preprocessor_options,				
			    n_preprocessor_options * sizeof (char **));	
  									
  preprocessor_options [n_preprocessor_options - 1] = save_string (option, len);  
}
     
static void 								
add_assembler_option (option, len)					
     char * option;							
     int    len;							
{									
  n_assembler_options++;							
									
  if (! assembler_options)						
    assembler_options							
      = (char **) xmalloc (n_assembler_options * sizeof (char **));	
  else									
    assembler_options							
      = (char **) xrealloc (assembler_options,				
			    n_assembler_options * sizeof (char **));	
  									
  assembler_options [n_assembler_options - 1] = save_string (option, len);  
}
     
static void 								
add_linker_option (option, len)					
     char * option;							
     int    len;							
{									
  n_linker_options++;							
									
  if (! linker_options)						
    linker_options							
      = (char **) xmalloc (n_linker_options * sizeof (char **));	
  else									
    linker_options							
      = (char **) xrealloc (linker_options,				
			    n_linker_options * sizeof (char **));	
  									
  linker_options [n_linker_options - 1] = save_string (option, len);  
}
     

/* Create the vector `switches' and its contents.
   Store its length in `n_switches'.  */

static void
process_command (argc, argv)
     int argc;
     char **argv;
{
  register int i;
  char *temp;
  char *spec_lang = 0;
  int last_language_n_infiles;
  int have_c = 0;
  int have_o = 0;
  int lang_n_infiles = 0;

  GET_ENVIRONMENT (gcc_exec_prefix, "GCC_EXEC_PREFIX");

  n_switches = 0;
  n_infiles = 0;
  added_libraries = 0;

  /* Figure compiler version from version string.  */

  compiler_version = save_string (version_string, strlen (version_string));
  for (temp = compiler_version; *temp; ++temp)
    {
      if (*temp == ' ')
	{
	  *temp = '\0';
	  break;
	}
    }

  /* Set up the default search paths.  */

  if (gcc_exec_prefix)
    {
      int len = strlen (gcc_exec_prefix);
      if (len > sizeof ("/lib/gcc-lib/")-1
	  && (gcc_exec_prefix[len-1] == '/'
	      || gcc_exec_prefix[len-1] == DIR_SEPARATOR))
	{
	  temp = gcc_exec_prefix + len - sizeof ("/lib/gcc-lib/") + 1;
	  if ((*temp == '/' || *temp == DIR_SEPARATOR)
	      && strncmp (temp+1, "lib", 3) == 0
	      && (temp[4] == '/' || temp[4] == DIR_SEPARATOR)
	      && strncmp (temp+5, "gcc-lib", 7) == 0)
	    len -= sizeof ("/lib/gcc-lib/") - 1;
	}

      set_std_prefix (gcc_exec_prefix, len);
      add_prefix (&exec_prefixes, gcc_exec_prefix, "GCC", 0, 0, NULL_PTR);
      add_prefix (&startfile_prefixes, gcc_exec_prefix, "GCC", 0, 0, NULL_PTR);
    }

  /* COMPILER_PATH and LIBRARY_PATH have values
     that are lists of directory names with colons.  */

  GET_ENVIRONMENT (temp, "COMPILER_PATH");
  if (temp)
    {
      char *startp, *endp;
      char *nstore = (char *) alloca (strlen (temp) + 3);

      startp = endp = temp;
      while (1)
	{
	  if (*endp == PATH_SEPARATOR || *endp == 0)
	    {
	      strncpy (nstore, startp, endp-startp);
	      if (endp == startp)
		strcpy (nstore, concat (".", dir_separator_str, NULL_PTR));
	      else if (endp[-1] != '/' && endp[-1] != DIR_SEPARATOR)
		{
		  nstore[endp-startp] = DIR_SEPARATOR;
		  nstore[endp-startp+1] = 0;
		}
	      else
		nstore[endp-startp] = 0;
	      add_prefix (&exec_prefixes, nstore, 0, 0, 0, NULL_PTR);
	      add_prefix (&include_prefixes,
			  concat (nstore, "include", NULL_PTR),
			  0, 0, 0, NULL_PTR);
	      if (*endp == 0)
		break;
	      endp = startp = endp + 1;
	    }
	  else
	    endp++;
	}
    }

  GET_ENVIRONMENT (temp, "LIBRARY_PATH");
  if (temp && *cross_compile == '0')
    {
      char *startp, *endp;
      char *nstore = (char *) alloca (strlen (temp) + 3);

      startp = endp = temp;
      while (1)
	{
	  if (*endp == PATH_SEPARATOR || *endp == 0)
	    {
	      strncpy (nstore, startp, endp-startp);
	      if (endp == startp)
		strcpy (nstore, concat (".", dir_separator_str, NULL_PTR));
	      else if (endp[-1] != '/' && endp[-1] != DIR_SEPARATOR)
		{
		  nstore[endp-startp] = DIR_SEPARATOR;
		  nstore[endp-startp+1] = 0;
		}
	      else
		nstore[endp-startp] = 0;
	      add_prefix (&startfile_prefixes, nstore, NULL_PTR,
			  0, 0, NULL_PTR);
	      if (*endp == 0)
		break;
	      endp = startp = endp + 1;
	    }
	  else
	    endp++;
	}
    }

  /* Use LPATH like LIBRARY_PATH (for the CMU build program).  */
  GET_ENVIRONMENT (temp, "LPATH");
  if (temp && *cross_compile == '0')
    {
      char *startp, *endp;
      char *nstore = (char *) alloca (strlen (temp) + 3);

      startp = endp = temp;
      while (1)
	{
	  if (*endp == PATH_SEPARATOR || *endp == 0)
	    {
	      strncpy (nstore, startp, endp-startp);
	      if (endp == startp)
		strcpy (nstore, concat (".", dir_separator_str, NULL_PTR));
	      else if (endp[-1] != '/' && endp[-1] != DIR_SEPARATOR)
		{
		  nstore[endp-startp] = DIR_SEPARATOR;
		  nstore[endp-startp+1] = 0;
		}
	      else
		nstore[endp-startp] = 0;
	      add_prefix (&startfile_prefixes, nstore, NULL_PTR,
			  0, 0, NULL_PTR);
	      if (*endp == 0)
		break;
	      endp = startp = endp + 1;
	    }
	  else
	    endp++;
	}
    }

  /* Convert new-style -- options to old-style.  */
  translate_options (&argc, &argv);

#ifdef LANG_SPECIFIC_DRIVER
  /* Do language-specific adjustment/addition of flags.  */
  lang_specific_driver (fatal, &argc, &argv, &added_libraries);
#endif

  /* Scan argv twice.  Here, the first time, just count how many switches
     there will be in their vector, and how many input files in theirs.
     Here we also parse the switches that cc itself uses (e.g. -v).  */

  for (i = 1; i < argc; i++)
    {
      if (! strcmp (argv[i], "-dumpspecs"))
	{
	  struct spec_list *sl;
	  init_spec ();
	  for (sl = specs; sl; sl = sl->next)
	    printf ("*%s:\n%s\n\n", sl->name, *(sl->ptr_spec));
	  exit (0);
	}
      else if (! strcmp (argv[i], "-dumpversion"))
	{
	  printf ("%s\n", spec_version);
	  exit (0);
	}
      else if (! strcmp (argv[i], "-dumpmachine"))
	{
	  printf ("%s\n", spec_machine);
	  exit  (0);
	}
      else if (strcmp (argv[i], "-fhelp") == 0)
	{
	  /* translate_options () has turned --help into -fhelp.  */
	  print_help_list = 1;

	  /* We will be passing a dummy file on to the sub-processes.  */
	  n_infiles++;
	  n_switches++;
	  
	  add_preprocessor_option ("--help", 6);
	  add_assembler_option ("--help", 6);
	  add_linker_option ("--help", 6);
	}
      else if (! strcmp (argv[i], "-print-search-dirs"))
	print_search_dirs = 1;
      else if (! strcmp (argv[i], "-print-libgcc-file-name"))
	print_file_name = "libgcc.a";
      else if (! strncmp (argv[i], "-print-file-name=", 17))
	print_file_name = argv[i] + 17;
      else if (! strncmp (argv[i], "-print-prog-name=", 17))
	print_prog_name = argv[i] + 17;
      else if (! strcmp (argv[i], "-print-multi-lib"))
	print_multi_lib = 1;
      else if (! strcmp (argv[i], "-print-multi-directory"))
	print_multi_directory = 1;
      else if (! strncmp (argv[i], "-Wa,", 4))
	{
	  int prev, j;
	  /* Pass the rest of this option to the assembler.  */

	  /* Split the argument at commas.  */
	  prev = 4;
	  for (j = 4; argv[i][j]; j++)
	    if (argv[i][j] == ',')
	      {
		add_assembler_option (argv[i] + prev, j - prev);
		prev = j + 1;
	      }
	  
	  /* Record the part after the last comma.  */
	  add_assembler_option (argv[i] + prev, j - prev);
	}
      else if (! strncmp (argv[i], "-Wp,", 4))
	{
	  int prev, j;
	  /* Pass the rest of this option to the preprocessor.  */

	  /* Split the argument at commas.  */
	  prev = 4;
	  for (j = 4; argv[i][j]; j++)
	    if (argv[i][j] == ',')
	      {
		add_preprocessor_option (argv[i] + prev, j - prev);
		prev = j + 1;
	      }
	  
	  /* Record the part after the last comma.  */
	  add_preprocessor_option (argv[i] + prev, j - prev);
	}
      else if (argv[i][0] == '+' && argv[i][1] == 'e')
	/* The +e options to the C++ front-end.  */
	n_switches++;
      else if (strncmp (argv[i], "-Wl,", 4) == 0)
	{
	  int j;
	  /* Split the argument at commas.  */
	  for (j = 3; argv[i][j]; j++)
	    n_infiles += (argv[i][j] == ',');
	}
      else if (strcmp (argv[i], "-Xlinker") == 0)
	{
	  if (i + 1 == argc)
	    fatal ("argument to `-Xlinker' is missing");

	  n_infiles++;
	  i++;
	}
      else if (strncmp (argv[i], "-l", 2) == 0)
	n_infiles++;
      else if (strcmp (argv[i], "-save-temps") == 0)
	{
	  save_temps_flag = 1;
	  n_switches++;
	}
      else if (strcmp (argv[i], "-specs") == 0)
	{
	  struct user_specs *user = (struct user_specs *)
	    xmalloc (sizeof (struct user_specs));
	  if (++i >= argc)
	    fatal ("argument to `-specs' is missing");

	  user->next = (struct user_specs *)0;
	  user->filename = argv[i];
	  if (user_specs_tail)
	    user_specs_tail->next = user;
	  else
	    user_specs_head = user;
	  user_specs_tail = user;
	}
      else if (strncmp (argv[i], "-specs=", 7) == 0)
	{
	  struct user_specs *user = (struct user_specs *)
	    xmalloc (sizeof (struct user_specs));
	  if (strlen (argv[i]) == 7)
	    fatal ("argument to `-specs=' is missing");

	  user->next = (struct user_specs *)0;
	  user->filename = argv[i]+7;
	  if (user_specs_tail)
	    user_specs_tail->next = user;
	  else
	    user_specs_head = user;
	  user_specs_tail = user;
	}
      else if (argv[i][0] == '-' && argv[i][1] != 0)
	{
	  register char *p = &argv[i][1];
	  register int c = *p;

	  switch (c)
	    {
	    case 'b':
              n_switches++;
	      if (p[1] == 0 && i + 1 == argc)
		fatal ("argument to `-b' is missing");
	      if (p[1] == 0)
		spec_machine = argv[++i];
	      else
		spec_machine = p + 1;

	      warn_std_ptr = &warn_std;
	      break;

	    case 'B':
	      {
		char *value;
		if (p[1] == 0 && i + 1 == argc)
		  fatal ("argument to `-B' is missing");
		if (p[1] == 0)
		  value = argv[++i];
		else
		  value = p + 1;
		add_prefix (&exec_prefixes, value, NULL_PTR, 1, 0, &warn_B);
		add_prefix (&startfile_prefixes, value, NULL_PTR,
			    1, 0, &warn_B);
		add_prefix (&include_prefixes, concat (value, "include",
						       NULL_PTR),
			    NULL_PTR, 1, 0, NULL_PTR);

		/* As a kludge, if the arg is "[foo/]stageN/", just add
		   "[foo/]include" to the include prefix.  */
		{
		  int len = strlen (value);
		  if ((len == 7
		       || (len > 7
			   && (value[len - 8] == '/'
			       || value[len - 8] == DIR_SEPARATOR)))
		      && strncmp (value + len - 7, "stage", 5) == 0
		      && ISDIGIT (value[len - 2])
		      && (value[len - 1] == '/'
			  || value[len - 1] == DIR_SEPARATOR))
		    {
		      if (len == 7)
			add_prefix (&include_prefixes, "include", NULL_PTR,
				    1, 0, NULL_PTR);
		      else
			{
			  char *string = xmalloc (len + 1);
			  strncpy (string, value, len-7);
			  strcpy (string+len-7, "include");
			  add_prefix (&include_prefixes, string, NULL_PTR,
				      1, 0, NULL_PTR);
			}
		    }