gcc/c/gccspec.c

   1 /* Specific flags and argument handling of the C front-end.
   2    Copyright (C) 1999-2020 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 "opts.h"
  25
  26 /* Filter command line before processing by the gcc driver proper.  */
  27 void
  28 lang_specific_driver (struct cl_decoded_option **in_decoded_options ATTRIBUTE_UNUSED,
  29                       unsigned int *in_decoded_options_count 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) && ! NEXT_OBJC_RUNTIME
  36   unsigned int i;
  37
  38   /* The new argument list will be contained in this.  */
  39   struct cl_decoded_option *new_decoded_options;
  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   unsigned int argc;
  46
  47   /* The argument list.  */
  48   struct cl_decoded_option *decoded_options;
  49
  50   argc = *in_decoded_options_count;
  51   decoded_options = *in_decoded_options;
  52
  53   for (i = 1; i < argc; i++)
  54     {
  55       switch (decoded_options[i].opt_index)
  56         {
  57         case OPT_static_libgcc:
  58         case OPT_static:
  59           return;
  60
  61         case OPT_SPECIAL_input_file:
  62           {
  63             const char *file = decoded_options[i].arg;
  64             int len;
  65
  66             /* If the filename ends in .m or .mi, we are compiling
  67                ObjC and want to pass -shared-libgcc.  */
  68             len = strlen (file);
  69             if ((len > 2 && file[len - 2] == '.' && file[len - 1] == 'm')
  70                 ||  (len > 3 && file[len - 3] == '.' && file[len - 2] == 'm'
  71                      && file[len - 1] == 'i'))
  72               shared_libgcc = 1;
  73           }
  74           break;
  75         }
  76     }
  77
  78   if  (shared_libgcc)
  79     {
  80       new_decoded_options = XNEWVEC (struct cl_decoded_option, argc + 1);
  81
  82       i = 0;
  83       do
  84         {
  85           new_decoded_options[i] = decoded_options[i];
  86           i++;
  87         }
  88       while (i < argc);
  89
  90       generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
  91                        &new_decoded_options[i++]);
  92
  93       *in_decoded_options_count = i;
  94       *in_decoded_options = new_decoded_options;
  95     }
  96 #endif
  97 }
  98
  99 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 100 int
 101 lang_specific_pre_link (void)
 102 {
 103   return 0;  /* Not used for C.  */
 104 }
 105
 106 /* Number of extra output files that lang_specific_pre_link may generate.  */
 107 int lang_specific_extra_outfiles = 0;  /* Not used for C.  */