1 /* Specific flags and argument handling of the C preprocessor. 2 Copyright (C) 1999-2018 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #include "config.h" 21 #include "system.h" 22 #include "coretypes.h" 23 #include "tm.h" 24 #include "gcc.h" 25 #include "opts.h" 26 27 /* The `cpp' executable installed in $(bindir) and $(cpp_install_dir) 28 is a customized version of the gcc driver. It forces -E; -S and -c 29 are errors. It defaults to -x c for files with unrecognized 30 extensions, unless -x options appear in argv, in which case we 31 assume the user knows what they're doing. If no explicit input is 32 mentioned, it will read stdin. */ 33 34 /* Suffixes for known sorts of input files. Note that we do not list 35 files which are normally considered to have been preprocessed already, 36 since the user's expectation is that `cpp' always preprocesses. */ 37 static const char *const known_suffixes[] = 38 { 39 ".c", ".C", ".S", ".m", 40 ".cc", ".cxx", ".cpp", ".cp", ".c++", 41 ".sx", 42 NULL 43 }; 44 45 /* Filter the command line before processing by the gcc driver proper. */ 46 void 47 lang_specific_driver (struct cl_decoded_option **in_decoded_options, 48 unsigned int *in_decoded_options_count, 49 int *in_added_libraries ATTRIBUTE_UNUSED) 50 { 51 struct cl_decoded_option *decoded_options = *in_decoded_options; 52 unsigned int argc = *in_decoded_options_count; 53 54 /* Do we need to read stdin? */ 55 int read_stdin = 1; 56 57 /* Do we need to insert -E? */ 58 int need_E = 1; 59 60 /* Have we seen an input file? */ 61 int seen_input = 0; 62 63 /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary. 64 0 means unnecessary. */ 65 unsigned int lang_c_here = 0; 66 unsigned int lang_S_here = 0; 67 unsigned int o_here = 0; 68 69 /* Do we need to fix up an input file with an unrecognized suffix? */ 70 int need_fixups = 1; 71 72 unsigned int i, j; 73 struct cl_decoded_option *new_decoded_options; 74 unsigned int new_argc; 75 extern int is_cpp_driver; 76 77 is_cpp_driver = 1; 78 79 /* First pass. If we see an -S or -c, barf. If we see an input file, 80 turn off read_stdin. If we see a second input file, it is actually 81 the output file. If we see a third input file, barf. */ 82 for (i = 1; i < argc; i++) 83 { 84 switch (decoded_options[i].opt_index) 85 { 86 case OPT_E: 87 need_E = 0; 88 break; 89 90 case OPT_S: 91 case OPT_c: 92 fatal_error (input_location, 93 "%qs is not a valid option to the preprocessor", 94 decoded_options[i].orig_option_with_args_text); 95 return; 96 97 case OPT_x: 98 need_fixups = 0; 99 break; 100 101 case OPT_SPECIAL_input_file: 102 { 103 const char *file = decoded_options[i].arg; 104 105 if (strcmp (file, "-") == 0) 106 read_stdin = 0; 107 else 108 { 109 seen_input++; 110 if (seen_input == 3) 111 { 112 fatal_error (input_location, "too many input files"); 113 return; 114 } 115 else if (seen_input == 2) 116 { 117 o_here = i; 118 } 119 else 120 { 121 read_stdin = 0; 122 if (need_fixups) 123 { 124 int l = strlen (file); 125 int known = 0; 126 const char *const *suff; 127 128 for (suff = known_suffixes; *suff; suff++) 129 if (!strcmp (*suff, &file[l - strlen(*suff)])) 130 { 131 known = 1; 132 break; 133 } 134 135 if (! known) 136 { 137 /* .s files are a special case; we have to 138 treat them like .S files so 139 -D__ASSEMBLER__ will be in effect. */ 140 if (!strcmp (".s", &file[l - 2])) 141 lang_S_here = i; 142 else 143 lang_c_here = i; 144 } 145 } 146 } 147 } 148 } 149 break; 150 } 151 } 152 153 /* If we don't need to edit the command line, we can bail early. */ 154 155 new_argc = argc + need_E + read_stdin + !!lang_c_here + !!lang_S_here; 156 157 if (new_argc == argc && !o_here) 158 return; 159 160 new_decoded_options = XNEWVEC (struct cl_decoded_option, new_argc); 161 162 new_decoded_options[0] = decoded_options[0]; 163 j = 1; 164 165 if (need_E) 166 generate_option (OPT_E, NULL, 1, CL_DRIVER, &new_decoded_options[j++]); 167 168 for (i = 1; i < argc; i++, j++) 169 { 170 if (i == lang_c_here) 171 generate_option (OPT_x, "c", 1, CL_DRIVER, &new_decoded_options[j++]); 172 else if (i == lang_S_here) 173 generate_option (OPT_x, "assembler-with-cpp", 1, CL_DRIVER, 174 &new_decoded_options[j++]); 175 else if (i == o_here) 176 { 177 generate_option (OPT_o, decoded_options[i].arg, 1, CL_DRIVER, 178 &new_decoded_options[j]); 179 continue; 180 } 181 182 new_decoded_options[j] = decoded_options[i]; 183 } 184 185 if (read_stdin) 186 generate_option_input_file ("-", &new_decoded_options[j++]); 187 188 *in_decoded_options_count = new_argc; 189 *in_decoded_options = new_decoded_options; 190 } 191 192 /* Called before linking. Returns 0 on success and -1 on failure. */ 193 int lang_specific_pre_link (void) 194 { 195 return 0; /* Not used for cpp. */ 196 } 197 198 /* Number of extra output files that lang_specific_pre_link may generate. */ 199 int lang_specific_extra_outfiles = 0; /* Not used for cpp. */ 200