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      1 /* Specific flags and argument handling of the C front-end.
      2    Copyright (C) 1999-2022 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.  */
    108