gcc/cp/g++spec.c

   1 /* Specific flags and argument handling of the C++ front-end.
   2    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001 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 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "gcc.h"
  26
  27 /* This bit is set if we saw a `-xfoo' language specification.  */
  28 #define LANGSPEC        (1<<1)
  29 /* This bit is set if they did `-lm' or `-lmath'.  */
  30 #define MATHLIB         (1<<2)
  31 /* This bit is set if they did `-lc'.  */
  32 #define WITHLIBC        (1<<3)
  33
  34 #ifndef MATH_LIBRARY
  35 #define MATH_LIBRARY "-lm"
  36 #endif
  37 #ifndef MATH_LIBRARY_PROFILE
  38 #define MATH_LIBRARY_PROFILE "-lm"
  39 #endif
  40
  41 #ifndef LIBSTDCXX
  42 #define LIBSTDCXX "-lstdc++"
  43 #endif
  44 #ifndef LIBSTDCXX_PROFILE
  45 #define LIBSTDCXX_PROFILE "-lstdc++"
  46 #endif
  47
  48 void
  49 lang_specific_driver (in_argc, in_argv, in_added_libraries)
  50      int *in_argc;
  51      const char *const **in_argv;
  52      int *in_added_libraries;
  53 {
  54   int i, j;
  55
  56   /* If nonzero, the user gave us the `-p' or `-pg' flag.  */
  57   int saw_profile_flag = 0;
  58
  59   /* If nonzero, the user gave us the `-v' flag.  */
  60   int saw_verbose_flag = 0;
  61
  62   /* This will be 0 if we encounter a situation where we should not
  63      link in libstdc++.  */
  64   int library = 1;
  65
  66   /* The number of arguments being added to what's in argv, other than
  67      libraries.  We use this to track the number of times we've inserted
  68      -xc++/-xnone.  */
  69   int added = 2;
  70
  71   /* Used to track options that take arguments, so we don't go wrapping
  72      those with -xc++/-xnone.  */
  73   const char *quote = NULL;
  74
  75   /* The new argument list will be contained in this.  */
  76   const char **arglist;
  77
  78   /* Nonzero if we saw a `-xfoo' language specification on the
  79      command line.  Used to avoid adding our own -xc++ if the user
  80      already gave a language for the file.  */
  81   int saw_speclang = 0;
  82
  83   /* "-lm" or "-lmath" if it appears on the command line.  */
  84   const char *saw_math = 0;
  85
  86   /* "-lc" if it appears on the command line.  */
  87   const char *saw_libc = 0;
  88
  89   /* An array used to flag each argument that needs a bit set for
  90      LANGSPEC, MATHLIB, or WITHLIBC.  */
  91   int *args;
  92
  93   /* By default, we throw on the math library if we have one.  */
  94   int need_math = (MATH_LIBRARY[0] != '\0');
  95
  96   /* True if we should add -shared-libgcc to the command-line.  */
  97   int shared_libgcc = 1;
  98
  99   /* The total number of arguments with the new stuff.  */
 100   int argc;
 101
 102   /* The argument list.  */
 103   const char *const *argv;
 104
 105   /* The number of libraries added in.  */
 106   int added_libraries;
 107
 108   /* The total number of arguments with the new stuff.  */
 109   int num_args = 1;
 110
 111   argc = *in_argc;
 112   argv = *in_argv;
 113   added_libraries = *in_added_libraries;
 114
 115   args = (int *) xcalloc (argc, sizeof (int));
 116
 117   for (i = 1; i < argc; i++)
 118     {
 119       /* If the previous option took an argument, we swallow it here.  */
 120       if (quote)
 121         {
 122           quote = NULL;
 123           continue;
 124         }
 125
 126       /* We don't do this anymore, since we don't get them with minus
 127          signs on them.  */
 128       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 129         continue;
 130
 131       if (argv[i][0] == '-')
 132         {
 133           if (library != 0 && (strcmp (argv[i], "-nostdlib") == 0
 134                                || strcmp (argv[i], "-nodefaultlibs") == 0))
 135             {
 136               library = 0;
 137             }
 138           else if (strcmp (argv[i], "-lm") == 0
 139                    || strcmp (argv[i], "-lmath") == 0
 140                    || strcmp (argv[i], MATH_LIBRARY) == 0
 141 #ifdef ALT_LIBM
 142                    || strcmp (argv[i], ALT_LIBM) == 0
 143 #endif
 144                   )
 145             {
 146               args[i] |= MATHLIB;
 147               need_math = 0;
 148             }
 149           else if (strcmp (argv[i], "-lc") == 0)
 150             args[i] |= WITHLIBC;
 151           else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0)
 152             saw_profile_flag++;
 153           else if (strcmp (argv[i], "-v") == 0)
 154             {
 155               saw_verbose_flag = 1;
 156               if (argc == 2)
 157                 {
 158                   /* If they only gave us `-v', don't try to link
 159                      in libg++.  */
 160                   library = 0;
 161                 }
 162             }
 163           else if (strncmp (argv[i], "-x", 2) == 0)
 164             saw_speclang = 1;
 165           else if (((argv[i][2] == '\0'
 166                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 167                     || strcmp (argv[i], "-Xlinker") == 0
 168                     || strcmp (argv[i], "-Tdata") == 0))
 169             quote = argv[i];
 170           else if (library != 0 && ((argv[i][2] == '\0'
 171                      && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 172                     || strcmp (argv[i], "-MM") == 0
 173                     || strcmp (argv[i], "-fsyntax-only") == 0))
 174             {
 175               /* Don't specify libraries if we won't link, since that would
 176                  cause a warning.  */
 177               library = 0;
 178               added -= 2;
 179             }
 180           else if (strcmp (argv[i], "-static-libgcc") == 0
 181                    || strcmp (argv[i], "-static") == 0)
 182             shared_libgcc = 0;
 183           else
 184             /* Pass other options through.  */
 185             continue;
 186         }
 187       else
 188         {
 189           int len;
 190
 191           if (saw_speclang)
 192             {
 193               saw_speclang = 0;
 194               continue;
 195             }
 196
 197           /* If the filename ends in .c or .i, put options around it.
 198              But not if a specified -x option is currently active.  */
 199           len = strlen (argv[i]);
 200           if (len > 2
 201               && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
 202               && argv[i][len - 2] == '.')
 203             {
 204               args[i] |= LANGSPEC;
 205               added += 2;
 206             }
 207         }
 208     }
 209
 210   if (quote)
 211     fatal ("argument to `%s' missing\n", quote);
 212
 213   /* If we know we don't have to do anything, bail now.  */
 214   if (! added && ! library)
 215     {
 216       free (args);
 217       return;
 218     }
 219
 220   /* There's no point adding -shared-libgcc if we don't have a shared
 221      libgcc.  */
 222 #ifndef ENABLE_SHARED_LIBGCC
 223   shared_libgcc = 0;
 224 #endif
 225
 226   /* Make sure to have room for the trailing NULL argument.  */
 227   num_args = argc + added + need_math + shared_libgcc + 1;
 228   arglist = (const char **) xmalloc (num_args * sizeof (char *));
 229
 230   i = 0;
 231   j = 0;
 232
 233   /* Copy the 0th argument, i.e., the name of the program itself.  */
 234   arglist[i++] = argv[j++];
 235
 236   /* NOTE: We start at 1 now, not 0.  */
 237   while (i < argc)
 238     {
 239       arglist[j] = argv[i];
 240
 241       /* Make sure -lstdc++ is before the math library, since libstdc++
 242          itself uses those math routines.  */
 243       if (!saw_math && (args[i] & MATHLIB) && library)
 244         {
 245           --j;
 246           saw_math = argv[i];
 247         }
 248
 249       if (!saw_libc && (args[i] & WITHLIBC) && library)
 250         {
 251           --j;
 252           saw_libc = argv[i];
 253         }
 254
 255       /* Wrap foo.c and foo.i files in a language specification to
 256          force the gcc compiler driver to run cc1plus on them.  */
 257       if (args[i] & LANGSPEC)
 258         {
 259           int len = strlen (argv[i]);
 260           if (argv[i][len - 1] == 'i')
 261             arglist[j++] = "-xc++-cpp-output";
 262           else
 263             arglist[j++] = "-xc++";
 264           arglist[j++] = argv[i];
 265           arglist[j] = "-xnone";
 266         }
 267
 268       i++;
 269       j++;
 270     }
 271
 272   /* Add `-lstdc++' if we haven't already done so.  */
 273   if (library)
 274     {
 275       arglist[j++] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 276       added_libraries++;
 277 #ifdef USE_LIBUNWIND_EXCEPTIONS
 278 # ifndef LIBUNWIND
 279 #  define LIBUNWIND "-lunwind"
 280 # endif
 281       arglist[j++] = LIBUNWIND;
 282       added_libraries++;
 283 #endif
 284     }
 285   if (saw_math)
 286     arglist[j++] = saw_math;
 287   else if (library && need_math)
 288     {
 289       arglist[j++] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 290       added_libraries++;
 291     }
 292   if (saw_libc)
 293     arglist[j++] = saw_libc;
 294   if (shared_libgcc)
 295     arglist[j++] = "-shared-libgcc";
 296
 297   arglist[j] = NULL;
 298
 299   *in_argc = j;
 300   *in_argv = arglist;
 301   *in_added_libraries = added_libraries;
 302 }
 303
 304 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 305 int lang_specific_pre_link ()  /* Not used for C++.  */
 306 {
 307   return 0;
 308 }
 309
 310 /* Number of extra output files that lang_specific_pre_link may generate.  */
 311 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */
 312
 313 /* Table of language-specific spec functions.  */
 314 const struct spec_function lang_specific_spec_functions[] =
 315 {
 316   { 0, 0 }
 317 };