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 GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, 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.  */
  63 static 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. */
  71 void
  72 lang_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   /* One more slot for a terminating null.  */
 198   new_argv = (char **) xmalloc ((new_argc + 1) * sizeof(char *));
 199
 200   new_argv[0] = argv[0];
 201   j = 1;
 202
 203   if (need_E)
 204     new_argv[j++] = "-E";
 205
 206   if (need_no_gcc)
 207     new_argv[j++] = "-no-gcc";
 208
 209   for (i = 1; i < argc; i++, j++)
 210     {
 211       if (i == lang_c_here)
 212         new_argv[j++] = "-xc";
 213       else if (i == lang_S_here)
 214         new_argv[j++] = "-xassembler-with-cpp";
 215       else if (i == o_here)
 216         new_argv[j++] = "-o";
 217
 218       new_argv[j] = argv[i];
 219     }
 220
 221   if (read_stdin)
 222     new_argv[j++] = "-";
 223
 224   new_argv[j] = NULL;
 225   *in_argc = new_argc;
 226   *in_argv = new_argv;
 227 }
 228
 229 /* Called before linking.  Returns 0 on success and -1 on failure. */
 230 int lang_specific_pre_link ()
 231 {
 232   return 0;  /* Not used for cpp. */
 233 }
 234
 235 /* Number of extra output files that lang_specific_pre_link may generate. */
 236 int lang_specific_extra_outfiles = 0;  /* Not used for cpp. */