1/* Specific flags and argument handling of the C front-end.
2   Copyright (C) 1999, 2001, 2003, 2007 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along 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.  */
27void
28lang_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.  */
99int
100lang_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.  */
106int lang_specific_extra_outfiles = 0;  /* Not used for C.  */
107