gcc/cppspec.c

   1 /* Specific flags and argument handling of the C preprocessor.
   2    Copyright (C) 1999, 2007, 2010 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "gcc.h"
  25 #include "opts.h"
  26
  27 /* The `cpp' executable installed in $(bindir) and $(cpp_install_dir)
  28    is a customized version of the gcc driver.  It forces -E; -S and -c
  29    are errors.  It defaults to -x c for files with unrecognized
  30    extensions, unless -x options appear in argv, in which case we
  31    assume the user knows what they're doing.  If no explicit input is
  32    mentioned, it will read stdin.  */
  33
  34 /* Suffixes for known sorts of input files.  Note that we do not list
  35    files which are normally considered to have been preprocessed already,
  36    since the user's expectation is that `cpp' always preprocesses.  */
  37 static const char *const known_suffixes[] =
  38 {
  39   ".c",  ".C",   ".S",   ".m",
  40   ".cc", ".cxx", ".cpp", ".cp",  ".c++",
  41   ".sx",
  42   NULL
  43 };
  44
  45 /* Filter the command line before processing by the gcc driver proper.  */
  46 void
  47 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
  48                       unsigned int *in_decoded_options_count,
  49                       int *in_added_libraries ATTRIBUTE_UNUSED)
  50 {
  51   struct cl_decoded_option *decoded_options = *in_decoded_options;
  52   unsigned int argc = *in_decoded_options_count;
  53
  54   /* Do we need to read stdin? */
  55   int read_stdin = 1;
  56
  57   /* Do we need to insert -E? */
  58   int need_E = 1;
  59
  60   /* Have we seen an input file? */
  61   int seen_input = 0;
  62
  63   /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary.
  64      0 means unnecessary.  */
  65   unsigned int lang_c_here = 0;
  66   unsigned int lang_S_here = 0;
  67   unsigned int o_here = 0;
  68
  69   /* Do we need to fix up an input file with an unrecognized suffix? */
  70   int need_fixups = 1;
  71
  72   unsigned int i, j;
  73   struct cl_decoded_option *new_decoded_options;
  74   unsigned int new_argc;
  75   extern int is_cpp_driver;
  76
  77   is_cpp_driver = 1;
  78
  79   /* First pass.  If we see an -S or -c, barf.  If we see an input file,
  80      turn off read_stdin.  If we see a second input file, it is actually
  81      the output file.  If we see a third input file, barf.  */
  82   for (i = 1; i < argc; i++)
  83     {
  84       switch (decoded_options[i].opt_index)
  85         {
  86         case OPT_E:
  87           need_E = 0;
  88           break;
  89
  90         case OPT_S:
  91         case OPT_c:
  92           fatal_error ("%qs is not a valid option to the preprocessor",
  93                        decoded_options[i].orig_option_with_args_text);
  94           return;
  95
  96         case OPT_x:
  97           need_fixups = 0;
  98           break;
  99
 100         case OPT_SPECIAL_input_file:
 101           {
 102             const char *file = decoded_options[i].arg;
 103
 104             if (strcmp (file, "-") == 0)
 105               read_stdin = 0;
 106             else
 107               {
 108                 seen_input++;
 109                 if (seen_input == 3)
 110                   {
 111                     fatal_error ("too many input files");
 112                     return;
 113                   }
 114                 else if (seen_input == 2)
 115                   {
 116                     o_here = i;
 117                   }
 118                 else
 119                   {
 120                     read_stdin = 0;
 121                     if (need_fixups)
 122                       {
 123                         int l = strlen (file);
 124                         int known = 0;
 125                         const char *const *suff;
 126
 127                         for (suff = known_suffixes; *suff; suff++)
 128                           if (!strcmp (*suff, &file[l - strlen(*suff)]))
 129                             {
 130                               known = 1;
 131                               break;
 132                             }
 133
 134                         if (! known)
 135                           {
 136                             /* .s files are a special case; we have to
 137                                treat them like .S files so
 138                                -D__ASSEMBLER__ will be in effect.  */
 139                             if (!strcmp (".s", &file[l - 2]))
 140                               lang_S_here = i;
 141                             else
 142                               lang_c_here = i;
 143                           }
 144                       }
 145                   }
 146               }
 147           }
 148           break;
 149         }
 150     }
 151
 152   /* If we don't need to edit the command line, we can bail early.  */
 153
 154   new_argc = argc + need_E + read_stdin + !!lang_c_here + !!lang_S_here;
 155
 156   if (new_argc == argc && !o_here)
 157     return;
 158
 159   new_decoded_options = XNEWVEC (struct cl_decoded_option, new_argc);
 160
 161   new_decoded_options[0] = new_decoded_options[0];
 162   j = 1;
 163
 164   if (need_E)
 165     generate_option (OPT_E, NULL, 1, CL_DRIVER, &new_decoded_options[j++]);
 166
 167   for (i = 1; i < argc; i++, j++)
 168     {
 169       if (i == lang_c_here)
 170         generate_option (OPT_x, "c", 1, CL_DRIVER, &new_decoded_options[j++]);
 171       else if (i == lang_S_here)
 172         generate_option (OPT_x, "assembler-with-cpp", 1, CL_DRIVER,
 173                          &new_decoded_options[j++]);
 174       else if (i == o_here)
 175         {
 176           generate_option (OPT_o, decoded_options[i].arg, 1, CL_DRIVER,
 177                            &new_decoded_options[j]);
 178           continue;
 179         }
 180
 181       new_decoded_options[j] = decoded_options[i];
 182     }
 183
 184   if (read_stdin)
 185     generate_option_input_file ("-", &new_decoded_options[j++]);
 186
 187   *in_decoded_options_count = new_argc;
 188   *in_decoded_options = new_decoded_options;
 189 }
 190
 191 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 192 int lang_specific_pre_link (void)
 193 {
 194   return 0;  /* Not used for cpp.  */
 195 }
 196
 197 /* Number of extra output files that lang_specific_pre_link may generate.  */
 198 int lang_specific_extra_outfiles = 0;  /* Not used for cpp.  */