gcc/cppspec.c

   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
 107   /* First pass.  If we see an -S or -c, barf.  If we see an input file,
 108      turn off read_stdin.  If we see a second input file, it is actually
 109      the output file.  If we see a third input file, barf.  */
 110   for (i = 1; i < argc; i++)
 111     {
 112       if (quote == 1)
 113         {
 114           quote = 0;
 115           continue;
 116         }
 117
 118       if (argv[i][0] == '-')
 119         {
 120           if (argv[i][1] == '\0')
 121             read_stdin = 0;
 122           else if (argv[i][2] == '\0')
 123             {
 124               if (argv[i][1] == 'E')
 125                 need_E = 0;
 126               else if (argv[i][1] == 'S' || argv[i][1] == 'c')
 127                 {
 128                   fatal ("\"%s\" is not a valid option to the preprocessor",
 129                          argv[i]);
 130                   return;
 131                 }
 132               else if (argv[i][1] == 'x')
 133                 {
 134                   need_fixups = 0;
 135                   quote = 1;
 136                 }
 137               else if (SWITCH_TAKES_ARG (argv[i][1]))
 138                 quote = 1;
 139             }
 140           else if (argv[i][1] == 'x')
 141             need_fixups = 0;
 142           else if (argv[i][1] == 'g' && !strcmp(&argv[i][2], "cc"))
 143             need_no_gcc = 0;
 144           else if (WORD_SWITCH_TAKES_ARG (&argv[i][1]))
 145             quote = 1;
 146         }
 147       else /* not an option */
 148         {
 149           seen_input++;
 150           if (seen_input == 3)
 151             {
 152               fatal ("too many input files");
 153               return;
 154             }
 155           else if (seen_input == 2)
 156             {
 157               o_here = i;
 158             }
 159           else
 160             {
 161               read_stdin = 0;
 162               if (need_fixups)
 163                 {
 164                   int l = strlen (argv[i]);
 165                   int known = 0;
 166                   const char *const *suff;
 167
 168                   for (suff = known_suffixes; *suff; suff++)
 169                     if (!strcmp (*suff, &argv[i][l - strlen(*suff)]))
 170                       {
 171                         known = 1;
 172                         break;
 173                       }
 174
 175                   if (! known)
 176                     {
 177                       /* .s files are a special case; we have to treat
 178                          them like .S files so -D__ASSEMBLER__ will be
 179                          in effect.  */
 180                       if (!strcmp (".s", &argv[i][l - 2]))
 181                         lang_S_here = i;
 182                       else
 183                         lang_c_here = i;
 184                     }
 185                 }
 186             }
 187         }
 188     }
 189
 190   /* If we don't need to edit the command line, we can bail early.  */
 191
 192   new_argc = argc + need_E + need_no_gcc + read_stdin
 193     + !!o_here + !!lang_c_here + !!lang_S_here;
 194
 195   if (new_argc == argc)
 196     return;
 197
 198   /* One more slot for a terminating null.  */
 199   new_argv = (const char **) xmalloc ((new_argc + 1) * sizeof(char *));
 200
 201   new_argv[0] = argv[0];
 202   j = 1;
 203
 204   if (need_E)
 205     new_argv[j++] = "-E";
 206
 207   if (need_no_gcc)
 208     new_argv[j++] = "-no-gcc";
 209
 210   for (i = 1; i < argc; i++, j++)
 211     {
 212       if (i == lang_c_here)
 213         new_argv[j++] = "-xc";
 214       else if (i == lang_S_here)
 215         new_argv[j++] = "-xassembler-with-cpp";
 216       else if (i == o_here)
 217         new_argv[j++] = "-o";
 218
 219       new_argv[j] = argv[i];
 220     }
 221
 222   if (read_stdin)
 223     new_argv[j++] = "-";
 224
 225   new_argv[j] = NULL;
 226   *in_argc = new_argc;
 227   *in_argv = new_argv;
 228 }
 229
 230 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 231 int lang_specific_pre_link ()
 232 {
 233   return 0;  /* Not used for cpp.  */
 234 }
 235
 236 /* Number of extra output files that lang_specific_pre_link may generate.  */
 237 int lang_specific_extra_outfiles = 0;  /* Not used for cpp.  */