1/* Specific flags and argument handling of the C preprocessor. 2 Copyright (C) 1999 Free Software Foundation, Inc. 3 4This file is part of GNU CC. 5 6GNU CC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11GNU CC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GNU CC; see the file COPYING. If not, write to 18the Free Software Foundation, 59 Temple Place - Suite 330, 19Boston, MA 02111-1307, USA. */ 20 21#include "config.h" 22#include "system.h" 23 24/* The `cpp' executable installed in $(bindir) and $(cpp_install_dir) 25 is a customized version of the gcc driver. It forces -E; -S and -c 26 are errors. It defaults to -x c for files with unrecognized 27 extensions, unless -x options appear in argv, in which case we 28 assume the user knows what they're doing. If no explicit input is 29 mentioned, it will read stdin. */ 30 31/* Snarfed from gcc.c: */ 32 33/* This defines which switch letters take arguments. */ 34 35#define DEFAULT_SWITCH_TAKES_ARG(CHAR) \ 36 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \ 37 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \ 38 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \ 39 || (CHAR) == 'L' || (CHAR) == 'A' || (CHAR) == 'V' \ 40 || (CHAR) == 'B' || (CHAR) == 'b') 41 42#ifndef SWITCH_TAKES_ARG 43#define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR) 44#endif 45 46/* This defines which multi-letter switches take arguments. */ 47 48#define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \ 49 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \ 50 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \ 51 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \ 52 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \ 53 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \ 54 || !strcmp (STR, "isystem") || !strcmp (STR, "specs")) 55 56#ifndef WORD_SWITCH_TAKES_ARG 57#define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR) 58#endif 59 60/* Suffixes for known sorts of input files. Note that we do not list 61 files which are normally considered to have been preprocessed already, 62 since the user's expectation is that `cpp' always preprocesses. */ 63static const char *const known_suffixes[] = 64{ 65 ".c", ".C", ".S", ".m", 66 ".cc", ".cxx", ".cpp", ".cp", ".c++", 67 NULL 68}; 69 70/* Filter argc and argv before processing by the gcc driver proper. */ 71void 72lang_specific_driver (errfn, in_argc, in_argv, in_added_libraries) 73 void (*errfn) PVPROTO((const char *, ...)); 74 int *in_argc; 75 char ***in_argv; 76 int *in_added_libraries ATTRIBUTE_UNUSED; 77{ 78 int argc = *in_argc; 79 char **argv = *in_argv; 80 81 /* Do we need to read stdin? */ 82 int read_stdin = 1; 83 84 /* Do we need to insert -E? */ 85 int need_E = 1; 86 87 /* Do we need to insert -no-gcc? */ 88 int need_no_gcc = 1; 89 90 /* Have we seen an input file? */ 91 int seen_input = 0; 92 93 /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary. 94 0 means unnecessary. */ 95 int lang_c_here = 0; 96 int lang_S_here = 0; 97 int o_here = 0; 98 99 /* Do we need to fix up an input file with an unrecognized suffix? */ 100 int need_fixups = 1; 101 102 int i, j, quote; 103 char **new_argv; 104 int new_argc; 105 106 /* First pass. If we see an -S or -c, barf. If we see an input file, 107 turn off read_stdin. If we see a second input file, it is actually 108 the output file. If we see a third input file, barf. */ 109 for (i = 1; i < argc; i++) 110 { 111 if (quote == 1) 112 { 113 quote = 0; 114 continue; 115 } 116 117 if (argv[i][0] == '-') 118 { 119 if (argv[i][1] == '\0') 120 read_stdin = 0; 121 else if (argv[i][2] == '\0') 122 { 123 if (argv[i][1] == 'E') 124 need_E = 0; 125 else if (argv[i][1] == 'S' || argv[i][1] == 'c') 126 { 127 (*errfn) ("`%s' is not a legal option to the preprocessor", 128 argv[i]); 129 return; 130 } 131 else if (argv[i][1] == 'x') 132 { 133 need_fixups = 0; 134 quote = 1; 135 } 136 else if (SWITCH_TAKES_ARG (argv[i][1])) 137 quote = 1; 138 } 139 else if (argv[i][1] == 'x') 140 need_fixups = 0; 141 else if (argv[i][1] == 'g' && !strcmp(&argv[i][2], "cc")) 142 need_no_gcc = 0; 143 else if (WORD_SWITCH_TAKES_ARG (&argv[i][1])) 144 quote = 1; 145 } 146 else /* not an option */ 147 { 148 seen_input++; 149 if (seen_input == 3) 150 { 151 (*errfn) ("too many input files"); 152 return; 153 } 154 else if (seen_input == 2) 155 { 156 o_here = i; 157 } 158 else 159 { 160 read_stdin = 0; 161 if (need_fixups) 162 { 163 int l = strlen (argv[i]); 164 int known = 0; 165 const char *const *suff; 166 167 for (suff = known_suffixes; *suff; suff++) 168 if (!strcmp (*suff, &argv[i][l - strlen(*suff)])) 169 { 170 known = 1; 171 break; 172 } 173 174 if (! known) 175 { 176 /* .s files are a special case; we have to treat 177 them like .S files so -D__ASSEMBLER__ will be 178 in effect. */ 179 if (!strcmp (".s", &argv[i][l - 2])) 180 lang_S_here = i; 181 else 182 lang_c_here = i; 183 } 184 } 185 } 186 } 187 } 188 189 /* If we don't need to edit the command line, we can bail early. */ 190 191 new_argc = argc + need_E + need_no_gcc + read_stdin 192 + !!o_here + !!lang_c_here + !!lang_S_here; 193 194 if (new_argc == argc) 195 return; 196 197 new_argv = xmalloc (new_argc * sizeof(char *)); 198 199 new_argv[0] = argv[0]; 200 j = 1; 201 202 if (need_E) 203 new_argv[j++] = "-E"; 204 205 if (need_no_gcc) 206 new_argv[j++] = "-no-gcc"; 207 208 for (i = 1; i < argc; i++, j++) 209 { 210 if (i == lang_c_here) 211 new_argv[j++] = "-xc"; 212 else if (i == lang_S_here) 213 new_argv[j++] = "-xassembler-with-cpp"; 214 else if (i == o_here) 215 new_argv[j++] = "-o"; 216 217 new_argv[j] = argv[i]; 218 } 219 220 if (read_stdin) 221 new_argv[j] = "-"; 222 223 *in_argc = new_argc; 224 *in_argv = new_argv; 225} 226 227/* Called before linking. Returns 0 on success and -1 on failure. */ 228int lang_specific_pre_link () 229{ 230 return 0; /* Not used for cpp. */ 231} 232 233/* Number of extra output files that lang_specific_pre_link may generate. */ 234int lang_specific_extra_outfiles = 0; /* Not used for cpp. */ 235