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   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.  */