gcc/cp/g++spec.c

   1 /* Specific flags and argument handling of the C++ front-end.
   2    Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23
  24 /* This bit is set if we saw a `-xfoo' language specification.  */
  25 #define LANGSPEC        (1<<1)
  26 /* This bit is set if they did `-lm' or `-lmath'.  */
  27 #define MATHLIB         (1<<2)
  28 /* This bit is set if they did `-lc'.  */
  29 #define WITHLIBC        (1<<3)
  30
  31 #ifndef MATH_LIBRARY
  32 #define MATH_LIBRARY "-lm"
  33 #endif
  34
  35 extern char *xmalloc PROTO((size_t));
  36
  37 void
  38 lang_specific_driver (fn, in_argc, in_argv, in_added_libraries)
  39      void (*fn)();
  40      int *in_argc;
  41      char ***in_argv;
  42      int *in_added_libraries;
  43 {
  44   int i, j;
  45
  46   /* If non-zero, the user gave us the `-v' flag.  */
  47   int saw_verbose_flag = 0;
  48
  49   /* This will be 0 if we encounter a situation where we should not
  50      link in libstdc++.  */
  51   int library = 1;
  52
  53   /* The number of arguments being added to what's in argv, other than
  54      libraries.  We use this to track the number of times we've inserted
  55      -xc++/-xnone.  */
  56   int added = 2;
  57
  58   /* Used to track options that take arguments, so we don't go wrapping
  59      those with -xc++/-xnone.  */
  60   char *quote = NULL;
  61
  62   /* The new argument list will be contained in this.  */
  63   char **arglist;
  64
  65   /* Non-zero if we saw a `-xfoo' language specification on the
  66      command line.  Used to avoid adding our own -xc++ if the user
  67      already gave a language for the file.  */
  68   int saw_speclang = 0;
  69
  70   /* "-lm" or "-lmath" if it appears on the command line.  */
  71   char *saw_math = 0;
  72
  73   /* "-lc" if it appears on the command line.  */
  74   char *saw_libc = 0;
  75
  76   /* An array used to flag each argument that needs a bit set for
  77      LANGSPEC, MATHLIB, or WITHLIBC.  */
  78   int *args;
  79
  80   /* By default, we throw on the math library if we have one.  */
  81   int need_math = (MATH_LIBRARY[0] != '\0');
  82
  83   /* The total number of arguments with the new stuff.  */
  84   int argc;
  85
  86   /* The argument list.  */
  87   char **argv;
  88
  89   /* The number of libraries added in.  */
  90   int added_libraries;
  91
  92   /* The total number of arguments with the new stuff.  */
  93   int num_args = 1;
  94
  95   argc = *in_argc;
  96   argv = *in_argv;
  97   added_libraries = *in_added_libraries;
  98
  99   args = (int *) xmalloc (argc * sizeof (int));
 100   bzero ((char *) args, argc * sizeof (int));
 101
 102   for (i = 1; i < argc; i++)
 103     {
 104       /* If the previous option took an argument, we swallow it here.  */
 105       if (quote)
 106         {
 107           quote = NULL;
 108           continue;
 109         }
 110
 111       /* We don't do this anymore, since we don't get them with minus
 112          signs on them.  */
 113       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 114         continue;
 115
 116       if (argv[i][0] == '-')
 117         {
 118           if (library != 0 && (strcmp (argv[i], "-nostdlib") == 0
 119                                || strcmp (argv[i], "-nodefaultlibs") == 0))
 120             {
 121               library = 0;
 122             }
 123           else if (strcmp (argv[i], "-lm") == 0
 124                    || strcmp (argv[i], "-lmath") == 0
 125                    || strcmp (argv[i], MATH_LIBRARY) == 0
 126 #ifdef ALT_LIBM
 127                    || strcmp (argv[i], ALT_LIBM) == 0
 128 #endif
 129                   )
 130             {
 131               args[i] |= MATHLIB;
 132               need_math = 0;
 133             }
 134           else if (strcmp (argv[i], "-lc") == 0)
 135             args[i] |= WITHLIBC;
 136           else if (strcmp (argv[i], "-v") == 0)
 137             {
 138               saw_verbose_flag = 1;
 139               if (argc == 2)
 140                 {
 141                   /* If they only gave us `-v', don't try to link
 142                      in libg++.  */
 143                   library = 0;
 144                 }
 145             }
 146           else if (strncmp (argv[i], "-x", 2) == 0)
 147             saw_speclang = 1;
 148           else if (((argv[i][2] == '\0'
 149                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 150                     || strcmp (argv[i], "-Tdata") == 0))
 151             quote = argv[i];
 152           else if (library != 0 && ((argv[i][2] == '\0'
 153                      && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 154                     || strcmp (argv[i], "-MM") == 0))
 155             {
 156               /* Don't specify libraries if we won't link, since that would
 157                  cause a warning.  */
 158               library = 0;
 159               added -= 2;
 160             }
 161           else
 162             /* Pass other options through.  */
 163             continue;
 164         }
 165       else
 166         {
 167           int len;
 168
 169           if (saw_speclang)
 170             {
 171               saw_speclang = 0;
 172               continue;
 173             }
 174
 175           /* If the filename ends in .c or .i, put options around it.
 176              But not if a specified -x option is currently active.  */
 177           len = strlen (argv[i]);
 178           if (len > 2
 179               && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
 180               && argv[i][len - 2] == '.')
 181             {
 182               args[i] |= LANGSPEC;
 183               added += 2;
 184             }
 185         }
 186     }
 187
 188   if (quote)
 189     (*fn) ("argument to `%s' missing\n", quote);
 190
 191   /* If we know we don't have to do anything, bail now.  */
 192   if (! added && ! library)
 193     {
 194       free (args);
 195       return;
 196     }
 197
 198   num_args = argc + added + need_math;
 199   arglist = (char **) xmalloc (num_args * sizeof (char *));
 200
 201   /* NOTE: We start at 1 now, not 0.  */
 202   for (i = 0, j = 0; i < argc; i++, j++)
 203     {
 204       arglist[j] = argv[i];
 205
 206       /* Make sure -lstdc++ is before the math library, since libstdc++
 207          itself uses those math routines.  */
 208       if (!saw_math && (args[i] & MATHLIB) && library)
 209         {
 210           --j;
 211           saw_math = argv[i];
 212         }
 213
 214       if (!saw_libc && (args[i] & WITHLIBC) && library)
 215         {
 216           --j;
 217           saw_libc = argv[i];
 218         }
 219
 220       /* Wrap foo.c and foo.i files in a language specification to
 221          force the gcc compiler driver to run cc1plus on them.  */
 222       if (args[i] & LANGSPEC)
 223         {
 224           int len = strlen (argv[i]);
 225           if (argv[i][len - 1] == 'i')
 226             arglist[j++] = "-xc++-cpp-output";
 227           else
 228             arglist[j++] = "-xc++";
 229           arglist[j++] = argv[i];
 230           arglist[j] = "-xnone";
 231         }
 232   }
 233
 234   /* Add `-lstdc++' if we haven't already done so.  */
 235   if (library)
 236     {
 237       arglist[j++] = "-lstdc++";
 238       added_libraries++;
 239     }
 240   if (saw_math)
 241     arglist[j++] = saw_math;
 242   else if (library && need_math)
 243     {
 244       arglist[j++] = MATH_LIBRARY;
 245       added_libraries++;
 246     }
 247   if (saw_libc)
 248     arglist[j++] = saw_libc;
 249
 250   arglist[j] = NULL;
 251
 252   *in_argc = j;
 253   *in_argv = arglist;
 254   *in_added_libraries = added_libraries;
 255 }
 256
 257 /* Called before linking.  Returns 0 on success and -1 on failure. */
 258 int lang_specific_pre_link ()  /* Not used for C++. */
 259 {
 260   return 0;
 261 }
 262
 263 /* Number of extra output files that lang_specific_pre_link may generate. */
 264 int lang_specific_extra_outfiles = 0;  /* Not used for C++. */