gcc/gccspec.c

   1 /* Specific flags and argument handling of the C front-end.
   2    Copyright (C) 1999, 2001, 2003, 2007 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
  26 /* Filter argc and argv before processing by the gcc driver proper.  */
  27 void
  28 lang_specific_driver (int *in_argc ATTRIBUTE_UNUSED,
  29                       const char *const **in_argv ATTRIBUTE_UNUSED,
  30                       int *in_added_libraries ATTRIBUTE_UNUSED)
  31 {
  32   /* Systems which use the NeXT runtime by default should arrange
  33      for the shared libgcc to be used when -fgnu-runtime is passed
  34      through specs.  */
  35 #if defined(ENABLE_SHARED_LIBGCC) && ! defined(NEXT_OBJC_RUNTIME)
  36   int i;
  37
  38   /* The new argument list will be contained in this.  */
  39   const char **arglist;
  40
  41   /* True if we should add -shared-libgcc to the command-line.  */
  42   int shared_libgcc = 0;
  43
  44   /* The total number of arguments with the new stuff.  */
  45   int argc;
  46
  47   /* The argument list.  */
  48   const char *const *argv;
  49
  50   argc = *in_argc;
  51   argv = *in_argv;
  52
  53   for (i = 1; i < argc; i++)
  54     {
  55       if (argv[i][0] == '-')
  56         {
  57           if (strcmp (argv[i], "-static-libgcc") == 0
  58               || strcmp (argv[i], "-static") == 0)
  59             return;
  60         }
  61       else
  62         {
  63           int len;
  64
  65           /* If the filename ends in .m or .mi, we are compiling ObjC
  66              and want to pass -shared-libgcc.  */
  67           len = strlen (argv[i]);
  68           if ((len > 2 && argv[i][len - 2] == '.' && argv[i][len - 1] == 'm')
  69               ||  (len > 3 && argv[i][len - 3] == '.' && argv[i][len - 2] == 'm'
  70                    && argv[i][len - 1] == 'i'))
  71             shared_libgcc = 1;
  72         }
  73     }
  74
  75   if  (shared_libgcc)
  76     {
  77       /* Make sure to have room for the trailing NULL argument.  */
  78       arglist = XNEWVEC (const char *, argc + 2);
  79
  80       i = 0;
  81       do
  82         {
  83           arglist[i] = argv[i];
  84           i++;
  85         }
  86       while (i < argc);
  87
  88       arglist[i++] = "-shared-libgcc";
  89
  90       arglist[i] = NULL;
  91
  92       *in_argc = i;
  93       *in_argv = arglist;
  94     }
  95 #endif
  96 }
  97
  98 /* Called before linking.  Returns 0 on success and -1 on failure.  */
  99 int
 100 lang_specific_pre_link (void)
 101 {
 102   return 0;  /* Not used for C.  */
 103 }
 104
 105 /* Number of extra output files that lang_specific_pre_link may generate.  */
 106 int lang_specific_extra_outfiles = 0;  /* Not used for C.  */