| /* 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 |
| 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 "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++", |
| ".sx", |
| NULL |
| }; |
| |
| /* Filter the command line before processing by the gcc driver proper. */ |
| void |
| 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; |
| break; |
| |
| case OPT_S: |
| case OPT_c: |
| fatal_error (input_location, |
| "%qs is not a valid option to the preprocessor", |
| decoded_options[i].orig_option_with_args_text); |
| return; |
| |
| case OPT_x: |
| need_fixups = 0; |
| break; |
| |
| case OPT_SPECIAL_input_file: |
| { |
| const char *file = decoded_options[i].arg; |
| |
| if (strcmp (file, "-") == 0) |
| read_stdin = 0; |
| else |
| { |
| seen_input++; |
| if (seen_input == 3) |
| { |
| fatal_error (input_location, "too many input files"); |
| return; |
| } |
| else if (seen_input == 2) |
| { |
| o_here = i; |
| } |
| else |
| { |
| 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; |
| break; |
| } |
| |
| 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; |
| else |
| lang_c_here = i; |
| } |
| } |
| } |
| } |
| } |
| break; |
| } |
| } |
| |
| /* 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) |
| return; |
| |
| 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, |
| &new_decoded_options[j++]); |
| else if (i == o_here) |
| { |
| generate_option (OPT_o, decoded_options[i].arg, 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| continue; |
| } |
| |
| 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. */ |