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/* Specific flags and argument handling of the C preprocessor.
Copyright (C) 1999-2021 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
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
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
<>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "opt-suggestions.h"
#include "gcc.h"
#include "opts.h"
/* The `cpp' executable installed in $(bindir) and $(cpp_install_dir)
is a customized version of the gcc driver. It forces -E; -S and -c
are errors. It defaults to -x c for files with unrecognized
extensions, unless -x options appear in argv, in which case we
assume the user knows what they're doing. If no explicit input is
mentioned, it will read stdin. */
/* Suffixes for known sorts of input files. Note that we do not list
files which are normally considered to have been preprocessed already,
since the user's expectation is that `cpp' always preprocesses. */
static const char *const known_suffixes[] =
".c", ".C", ".S", ".m",
".cc", ".cxx", ".cpp", ".cp", ".c++",
/* Filter the command line before processing by the gcc driver proper. */
lang_specific_driver (struct cl_decoded_option **in_decoded_options,
unsigned int *in_decoded_options_count,
int *in_added_libraries ATTRIBUTE_UNUSED)
struct cl_decoded_option *decoded_options = *in_decoded_options;
unsigned int argc = *in_decoded_options_count;
/* Do we need to read stdin? */
int read_stdin = 1;
/* Do we need to insert -E? */
int need_E = 1;
/* Have we seen an input file? */
int seen_input = 0;
/* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary.
0 means unnecessary. */
unsigned int lang_c_here = 0;
unsigned int lang_S_here = 0;
unsigned int o_here = 0;
/* Do we need to fix up an input file with an unrecognized suffix? */
int need_fixups = 1;
unsigned int i, j;
struct cl_decoded_option *new_decoded_options;
unsigned int new_argc;
extern int is_cpp_driver;
is_cpp_driver = 1;
/* First pass. If we see an -S or -c, barf. If we see an input file,
turn off read_stdin. If we see a second input file, it is actually
the output file. If we see a third input file, barf. */
for (i = 1; i < argc; i++)
switch (decoded_options[i].opt_index)
case OPT_E:
need_E = 0;
case OPT_S:
case OPT_c:
fatal_error (input_location,
"%qs is not a valid option to the preprocessor",
case OPT_x:
need_fixups = 0;
case OPT_SPECIAL_input_file:
const char *file = decoded_options[i].arg;
if (strcmp (file, "-") == 0)
read_stdin = 0;
if (seen_input == 3)
fatal_error (input_location, "too many input files");
else if (seen_input == 2)
o_here = i;
read_stdin = 0;
if (need_fixups)
int l = strlen (file);
int known = 0;
const char *const *suff;
for (suff = known_suffixes; *suff; suff++)
if (!strcmp (*suff, &file[l - strlen(*suff)]))
known = 1;
if (! known)
/* .s files are a special case; we have to
treat them like .S files so
-D__ASSEMBLER__ will be in effect. */
if (!strcmp (".s", &file[l - 2]))
lang_S_here = i;
lang_c_here = i;
/* If we don't need to edit the command line, we can bail early. */
new_argc = argc + need_E + read_stdin + !!lang_c_here + !!lang_S_here;
if (new_argc == argc && !o_here)
new_decoded_options = XNEWVEC (struct cl_decoded_option, new_argc);
new_decoded_options[0] = decoded_options[0];
j = 1;
if (need_E)
generate_option (OPT_E, NULL, 1, CL_DRIVER, &new_decoded_options[j++]);
for (i = 1; i < argc; i++, j++)
if (i == lang_c_here)
generate_option (OPT_x, "c", 1, CL_DRIVER, &new_decoded_options[j++]);
else if (i == lang_S_here)
generate_option (OPT_x, "assembler-with-cpp", 1, CL_DRIVER,
else if (i == o_here)
generate_option (OPT_o, decoded_options[i].arg, 1, CL_DRIVER,
new_decoded_options[j] = decoded_options[i];
if (read_stdin)
generate_option_input_file ("-", &new_decoded_options[j++]);
*in_decoded_options_count = new_argc;
*in_decoded_options = new_decoded_options;
/* Called before linking. Returns 0 on success and -1 on failure. */
int lang_specific_pre_link (void)
return 0; /* Not used for cpp. */
/* Number of extra output files that lang_specific_pre_link may generate. */
int lang_specific_extra_outfiles = 0; /* Not used for cpp. */