gcc/gccspec.c

   1 /* Specific flags and argument handling of the C front-end.
   2    Copyright (C) 1999, 2001, 2003, 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 /* Filter command line before processing by the gcc driver proper.  */
  28 void
  29 lang_specific_driver (struct cl_decoded_option **in_decoded_options ATTRIBUTE_UNUSED,
  30                       unsigned int *in_decoded_options_count ATTRIBUTE_UNUSED,
  31                       int *in_added_libraries ATTRIBUTE_UNUSED)
  32 {
  33   /* Systems which use the NeXT runtime by default should arrange
  34      for the shared libgcc to be used when -fgnu-runtime is passed
  35      through specs.  */
  36 #if defined(ENABLE_SHARED_LIBGCC) && ! defined(NEXT_OBJC_RUNTIME)
  37   unsigned int i;
  38
  39   /* The new argument list will be contained in this.  */
  40   struct cl_decoded_option *new_decoded_options;
  41
  42   /* True if we should add -shared-libgcc to the command-line.  */
  43   int shared_libgcc = 0;
  44
  45   /* The total number of arguments with the new stuff.  */
  46   unsigned int argc;
  47
  48   /* The argument list.  */
  49   struct cl_decoded_option *decoded_options;
  50
  51   argc = *in_decoded_options_count;
  52   decoded_options = *in_decoded_options;
  53
  54   for (i = 1; i < argc; i++)
  55     {
  56       switch (decoded_options[i].opt_index)
  57         {
  58         case OPT_static_libgcc:
  59         case OPT_static:
  60           return;
  61
  62         case OPT_SPECIAL_input_file:
  63           {
  64             const char *file = decoded_options[i].arg;
  65             int len;
  66
  67             /* If the filename ends in .m or .mi, we are compiling
  68                ObjC and want to pass -shared-libgcc.  */
  69             len = strlen (file);
  70             if ((len > 2 && file[len - 2] == '.' && file[len - 1] == 'm')
  71                 ||  (len > 3 && file[len - 3] == '.' && file[len - 2] == 'm'
  72                      && file[len - 1] == 'i'))
  73               shared_libgcc = 1;
  74           }
  75           break;
  76         }
  77     }
  78
  79   if  (shared_libgcc)
  80     {
  81       new_decoded_options = XNEWVEC (struct cl_decoded_option, argc + 1);
  82
  83       i = 0;
  84       do
  85         {
  86           new_decoded_options[i] = decoded_options[i];
  87           i++;
  88         }
  89       while (i < argc);
  90
  91       generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
  92                        &new_decoded_options[i++]);
  93
  94       *in_decoded_options_count = i;
  95       *in_decoded_options = new_decoded_options;
  96     }
  97 #endif
  98 }
  99
 100 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 101 int
 102 lang_specific_pre_link (void)
 103 {
 104   return 0;  /* Not used for C.  */
 105 }
 106
 107 /* Number of extra output files that lang_specific_pre_link may generate.  */
 108 int lang_specific_extra_outfiles = 0;  /* Not used for C.  */