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/* Specific flags and argument handling of the C++ front end.
Copyright (C) 1996-2021 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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 3, or (at your option)
any later version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "opts.h"
/* This bit is set if we saw a `-xfoo' language specification. */
#define LANGSPEC (1<<1)
/* This bit is set if they did `-lm' or `-lmath'. */
#define MATHLIB (1<<2)
/* This bit is set if they did `-lc'. */
#define WITHLIBC (1<<3)
/* Skip this option. */
#define SKIPOPT (1<<4)
#ifndef MATH_LIBRARY
#define MATH_LIBRARY "m"
#endif
#ifndef MATH_LIBRARY_PROFILE
#define MATH_LIBRARY_PROFILE MATH_LIBRARY
#endif
#ifndef LIBSTDCXX
#define LIBSTDCXX "stdc++"
#endif
#ifndef LIBSTDCXX_PROFILE
#define LIBSTDCXX_PROFILE LIBSTDCXX
#endif
#ifndef LIBSTDCXX_STATIC
#define LIBSTDCXX_STATIC NULL
#endif
#ifndef LIBCXX
#define LIBCXX "c++"
#endif
#ifndef LIBCXX_PROFILE
#define LIBCXX_PROFILE LIBCXX
#endif
#ifndef LIBCXX_STATIC
#define LIBCXX_STATIC NULL
#endif
#ifndef LIBCXXABI
#define LIBCXXABI "c++abi"
#endif
#ifndef LIBCXXABI_PROFILE
#define LIBCXXABI_PROFILE LIBCXXABI
#endif
#ifndef LIBCXXABI_STATIC
#define LIBCXXABI_STATIC NULL
#endif
/* The values used here must match those of the stdlib_kind enumeration
in c.opt. */
enum stdcxxlib_kind
{
USE_LIBSTDCXX = 1,
USE_LIBCXX = 2
};
void
lang_specific_driver (struct cl_decoded_option **in_decoded_options,
unsigned int *in_decoded_options_count,
int *in_added_libraries)
{
unsigned int i, j;
/* If nonzero, the user gave us the `-p' or `-pg' flag. */
int saw_profile_flag = 0;
/* What action to take for the c++ runtime library:
-1 means we should not link it in.
0 means we should link it if it is needed.
1 means it is needed and should be linked in.
2 means it is needed but should be linked statically. */
int library = 0;
/* Which c++ runtime library to link. */
stdcxxlib_kind which_library = USE_LIBSTDCXX;
/* The number of arguments being added to what's in argv, other than
libraries. We use this to track the number of times we've inserted
-xc++/-xnone. */
int added = 0;
/* The new argument list will be contained in this. */
struct cl_decoded_option *new_decoded_options;
/* Nonzero if we saw a `-xfoo' language specification on the
command line. Used to avoid adding our own -xc++ if the user
already gave a language for the file. */
int saw_speclang = 0;
/* "-lm" or "-lmath" if it appears on the command line. */
const struct cl_decoded_option *saw_math = NULL;
/* "-lrt" or eqivalent if it appears on the command line. */
const struct cl_decoded_option *saw_time = NULL;
/* "-lc" if it appears on the command line. */
const struct cl_decoded_option *saw_libc = NULL;
/* An array used to flag each argument that needs a bit set for
LANGSPEC, MATHLIB, or WITHLIBC. */
int *args;
/* By default, we throw on the math library if we have one. */
int need_math = (MATH_LIBRARY[0] != '\0');
/* True if we saw -static. */
int static_link = 0;
/* True if we should add -shared-libgcc to the command-line. */
int shared_libgcc = 1;
/* The total number of arguments with the new stuff. */
unsigned int argc;
/* The argument list. */
struct cl_decoded_option *decoded_options;
/* The number of libraries added in. */
int added_libraries;
/* The total number of arguments with the new stuff. */
unsigned int num_args = 1;
argc = *in_decoded_options_count;
decoded_options = *in_decoded_options;
added_libraries = *in_added_libraries;
args = XCNEWVEC (int, argc);
for (i = 1; i < argc; i++)
{
const char *arg = decoded_options[i].arg;
if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
continue; /* Avoid examining arguments of options missing them. */
switch (decoded_options[i].opt_index)
{
case OPT_nostdlib:
case OPT_nodefaultlibs:
library = -1;
break;
case OPT_l:
if (strcmp (arg, MATH_LIBRARY) == 0)
{
args[i] |= MATHLIB;
need_math = 0;
}
else if (strcmp (arg, "c") == 0)
args[i] |= WITHLIBC;
else
/* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */
library = (library == 0) ? 1 : library;
break;
case OPT_pg:
case OPT_p:
saw_profile_flag++;
break;
case OPT_x:
if (library == 0
&& (strcmp (arg, "c++") == 0
|| strcmp (arg, "c++-cpp-output") == 0
|| strcmp (arg, "objective-c++") == 0
|| strcmp (arg, "objective-c++-cpp-output") == 0))
library = 1;
saw_speclang = 1;
break;
case OPT_Xlinker:
case OPT_Wl_:
/* Arguments that go directly to the linker might be .o files,
or something, and so might cause libstdc++ to be needed. */
if (library == 0)
library = 1;
break;
case OPT_c:
case OPT_r:
case OPT_S:
case OPT_E:
case OPT_M:
case OPT_MM:
case OPT_fsyntax_only:
/* Don't specify libraries if we won't link, since that would
cause a warning. */
library = -1;
break;
case OPT_static:
static_link = 1;
break;
case OPT_static_libgcc:
shared_libgcc = 0;
break;
case OPT_static_libstdc__:
library = library >= 0 ? 2 : library;
args[i] |= SKIPOPT;
break;
case OPT_stdlib_:
which_library = (stdcxxlib_kind) decoded_options[i].value;
break;
case OPT_SPECIAL_input_file:
{
int len;
/* We don't do this anymore, since we don't get them with minus
signs on them. */
if (arg[0] == '\0' || arg[1] == '\0')
continue;
if (saw_speclang)
{
saw_speclang = 0;
continue;
}
/* If the filename ends in .[chi], put options around it.
But not if a specified -x option is currently active. */
len = strlen (arg);
if (len > 2
&& (arg[len - 1] == 'c'
|| arg[len - 1] == 'i'
|| arg[len - 1] == 'h')
&& arg[len - 2] == '.')
{
args[i] |= LANGSPEC;
added += 2;
}
/* If we don't know that this is a header file, we might
need to be linking in the libraries. */
if (library == 0)
{
if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0)
&& (len <= 2 || strcmp (arg + (len - 2), ".h") != 0)
&& (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0)
&& (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0)
&& (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0)
&& (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0)
&& (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0)
&& (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0)
&& (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0))
library = 1;
}
}
break;
}
}
/* There's no point adding -shared-libgcc if we don't have a shared
libgcc. */
#ifndef ENABLE_SHARED_LIBGCC
shared_libgcc = 0;
#endif
/* Add one for shared_libgcc or extra static library. */
num_args = argc + added + need_math + (library > 0) * 4 + 1;
/* For libc++, on most platforms, the ABI library (usually called libc++abi)
is provided as a separate DSO, which we must also append.
However, a platform might have the ability to forward the ABI library
from libc++, or combine it in some other way; in that case, LIBCXXABI
should be set to NULL to signal that it need not be appended. */
if (which_library == USE_LIBCXX && LIBCXXABI != NULL)
num_args += 4;
new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
i = 0;
j = 0;
/* Copy the 0th argument, i.e., the name of the program itself. */
new_decoded_options[j++] = decoded_options[i++];
/* NOTE: We start at 1 now, not 0. */
while (i < argc)
{
new_decoded_options[j] = decoded_options[i];
/* Make sure -lstdc++ is before the math library, since libstdc++
itself uses those math routines. */
if (!saw_math && (args[i] & MATHLIB) && library > 0)
{
--j;
saw_math = &decoded_options[i];
}
if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
{
--j;
saw_libc = &decoded_options[i];
}
/* Wrap foo.[chi] files in a language specification to
force the gcc compiler driver to run cc1plus on them. */
if (args[i] & LANGSPEC)
{
const char *arg = decoded_options[i].arg;
int len = strlen (arg);
switch (arg[len - 1])
{
case 'c':
generate_option (OPT_x, "c++", 1, CL_DRIVER,
&new_decoded_options[j++]);
break;
case 'i':
generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER,
&new_decoded_options[j++]);
break;
case 'h':
generate_option (OPT_x, "c++-header", 1, CL_DRIVER,
&new_decoded_options[j++]);
break;
default:
gcc_unreachable ();
}
new_decoded_options[j++] = decoded_options[i];
generate_option (OPT_x, "none", 1, CL_DRIVER,
&new_decoded_options[j]);
}
if ((args[i] & SKIPOPT) != 0)
--j;
i++;
j++;
}
/* Add `-lstdc++' if we haven't already done so. */
if (library > 0)
{
#ifdef HAVE_LD_STATIC_DYNAMIC
if (library > 1 && !static_link)
{
generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
&new_decoded_options[j]);
j++;
}
#endif
if (which_library == USE_LIBCXX)
{
generate_option (OPT_l,
saw_profile_flag ? LIBCXX_PROFILE : LIBCXX, 1,
CL_DRIVER, &new_decoded_options[j]);
if (LIBCXXABI != NULL)
{
j++;
added_libraries++;
generate_option (OPT_l,
saw_profile_flag ? LIBCXXABI_PROFILE
: LIBCXXABI, 1,
CL_DRIVER, &new_decoded_options[j]);
}
}
else
generate_option (OPT_l,
saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1,
CL_DRIVER, &new_decoded_options[j]);
added_libraries++;
j++;
/* Add target-dependent static library, if necessary. */
if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
{
generate_option (OPT_l, LIBSTDCXX_STATIC, 1,
CL_DRIVER, &new_decoded_options[j]);
added_libraries++;
j++;
}
#ifdef HAVE_LD_STATIC_DYNAMIC
if (library > 1 && !static_link)
{
generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
&new_decoded_options[j]);
j++;
}
#endif
}
if (saw_math)
new_decoded_options[j++] = *saw_math;
else if (library > 0 && need_math)
{
generate_option (OPT_l,
saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
1, CL_DRIVER, &new_decoded_options[j]);
added_libraries++;
j++;
}
if (saw_time)
new_decoded_options[j++] = *saw_time;
if (saw_libc)
new_decoded_options[j++] = *saw_libc;
if (shared_libgcc && !static_link)
generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
&new_decoded_options[j++]);
*in_decoded_options_count = j;
*in_decoded_options = new_decoded_options;
*in_added_libraries = added_libraries;
}
/* Called before linking. Returns 0 on success and -1 on failure. */
int lang_specific_pre_link (void) /* Not used for C++. */
{
return 0;
}
/* Number of extra output files that lang_specific_pre_link may generate. */
int lang_specific_extra_outfiles = 0; /* Not used for C++. */