1 /* Specific flags and argument handling of the C preprocessor. 2 Copyright (C) 1999 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 2, 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 COPYING. If not, write to the Free 18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 19 02111-1307, USA. */ 20 21 #include "config.h" 22 #include "system.h" 23 #include "gcc.h" 24 25 /* The `cpp' executable installed in $(bindir) and $(cpp_install_dir) 26 is a customized version of the gcc driver. It forces -E; -S and -c 27 are errors. It defaults to -x c for files with unrecognized 28 extensions, unless -x options appear in argv, in which case we 29 assume the user knows what they're doing. If no explicit input is 30 mentioned, it will read stdin. */ 31 32 /* Snarfed from gcc.c: */ 33 34 /* This defines which switch letters take arguments. */ 35 36 #define DEFAULT_SWITCH_TAKES_ARG(CHAR) \ 37 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \ 38 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \ 39 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \ 40 || (CHAR) == 'L' || (CHAR) == 'A' || (CHAR) == 'V' \ 41 || (CHAR) == 'B' || (CHAR) == 'b') 42 43 #ifndef SWITCH_TAKES_ARG 44 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR) 45 #endif 46 47 /* This defines which multi-letter switches take arguments. */ 48 49 #define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \ 50 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \ 51 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \ 52 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \ 53 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \ 54 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \ 55 || !strcmp (STR, "isystem") || !strcmp (STR, "specs") \ 56 || !strcmp (STR, "MF") || !strcmp (STR, "MT") || !strcmp (STR, "MQ")) 57 58 #ifndef WORD_SWITCH_TAKES_ARG 59 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR) 60 #endif 61 62 /* Suffixes for known sorts of input files. Note that we do not list 63 files which are normally considered to have been preprocessed already, 64 since the user's expectation is that `cpp' always preprocesses. */ 65 static const char *const known_suffixes[] = 66 { 67 ".c", ".C", ".S", ".m", 68 ".cc", ".cxx", ".cpp", ".cp", ".c++", 69 NULL 70 }; 71 72 /* Filter argc and argv before processing by the gcc driver proper. */ 73 void 74 lang_specific_driver (in_argc, in_argv, in_added_libraries) 75 int *in_argc; 76 const char *const **in_argv; 77 int *in_added_libraries ATTRIBUTE_UNUSED; 78 { 79 int argc = *in_argc; 80 const char *const *argv = *in_argv; 81 82 /* Do we need to read stdin? */ 83 int read_stdin = 1; 84 85 /* Do we need to insert -E? */ 86 int need_E = 1; 87 88 /* Do we need to insert -no-gcc? */ 89 int need_no_gcc = 1; 90 91 /* Have we seen an input file? */ 92 int seen_input = 0; 93 94 /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary. 95 0 means unnecessary. */ 96 int lang_c_here = 0; 97 int lang_S_here = 0; 98 int o_here = 0; 99 100 /* Do we need to fix up an input file with an unrecognized suffix? */ 101 int need_fixups = 1; 102 103 int i, j, quote = 0; 104 const char **new_argv; 105 int new_argc; 106 extern int is_cpp_driver; 107 108 is_cpp_driver = 1; 109 110 /* First pass. If we see an -S or -c, barf. If we see an input file, 111 turn off read_stdin. If we see a second input file, it is actually 112 the output file. If we see a third input file, barf. */ 113 for (i = 1; i < argc; i++) 114 { 115 if (quote == 1) 116 { 117 quote = 0; 118 continue; 119 } 120 121 if (argv[i][0] == '-') 122 { 123 if (argv[i][1] == '\0') 124 read_stdin = 0; 125 else if (argv[i][2] == '\0') 126 { 127 if (argv[i][1] == 'E') 128 need_E = 0; 129 else if (argv[i][1] == 'S' || argv[i][1] == 'c') 130 { 131 fatal ("\"%s\" is not a valid option to the preprocessor", 132 argv[i]); 133 return; 134 } 135 else if (argv[i][1] == 'x') 136 { 137 need_fixups = 0; 138 quote = 1; 139 } 140 else if (SWITCH_TAKES_ARG (argv[i][1])) 141 quote = 1; 142 } 143 else if (argv[i][1] == 'x') 144 need_fixups = 0; 145 else if (argv[i][1] == 'g' && !strcmp(&argv[i][2], "cc")) 146 need_no_gcc = 0; 147 else if (WORD_SWITCH_TAKES_ARG (&argv[i][1])) 148 quote = 1; 149 } 150 else /* not an option */ 151 { 152 seen_input++; 153 if (seen_input == 3) 154 { 155 fatal ("too many input files"); 156 return; 157 } 158 else if (seen_input == 2) 159 { 160 o_here = i; 161 } 162 else 163 { 164 read_stdin = 0; 165 if (need_fixups) 166 { 167 int l = strlen (argv[i]); 168 int known = 0; 169 const char *const *suff; 170 171 for (suff = known_suffixes; *suff; suff++) 172 if (!strcmp (*suff, &argv[i][l - strlen(*suff)])) 173 { 174 known = 1; 175 break; 176 } 177 178 if (! known) 179 { 180 /* .s files are a special case; we have to treat 181 them like .S files so -D__ASSEMBLER__ will be 182 in effect. */ 183 if (!strcmp (".s", &argv[i][l - 2])) 184 lang_S_here = i; 185 else 186 lang_c_here = i; 187 } 188 } 189 } 190 } 191 } 192 193 /* If we don't need to edit the command line, we can bail early. */ 194 195 new_argc = argc + need_E + need_no_gcc + read_stdin 196 + !!o_here + !!lang_c_here + !!lang_S_here; 197 198 if (new_argc == argc) 199 return; 200 201 /* One more slot for a terminating null. */ 202 new_argv = (const char **) xmalloc ((new_argc + 1) * sizeof(char *)); 203 204 new_argv[0] = argv[0]; 205 j = 1; 206 207 if (need_E) 208 new_argv[j++] = "-E"; 209 210 if (need_no_gcc) 211 new_argv[j++] = "-no-gcc"; 212 213 for (i = 1; i < argc; i++, j++) 214 { 215 if (i == lang_c_here) 216 new_argv[j++] = "-xc"; 217 else if (i == lang_S_here) 218 new_argv[j++] = "-xassembler-with-cpp"; 219 else if (i == o_here) 220 new_argv[j++] = "-o"; 221 222 new_argv[j] = argv[i]; 223 } 224 225 if (read_stdin) 226 new_argv[j++] = "-"; 227 228 new_argv[j] = NULL; 229 *in_argc = new_argc; 230 *in_argv = new_argv; 231 } 232 233 /* Called before linking. Returns 0 on success and -1 on failure. */ 234 int lang_specific_pre_link () 235 { 236 return 0; /* Not used for cpp. */ 237 } 238 239 /* Number of extra output files that lang_specific_pre_link may generate. */ 240 int lang_specific_extra_outfiles = 0; /* Not used for cpp. */ 241