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, 2002, 2003
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "gcc.h"
  27
  28 /* This bit is set if we saw a `-xfoo' language specification.  */
  29 #define LANGSPEC        (1<<1)
  30 /* This bit is set if they did `-lm' or `-lmath'.  */
  31 #define MATHLIB         (1<<2)
  32 /* This bit is set if they did `-lc'.  */
  33 #define WITHLIBC        (1<<3)
  34
  35 #ifndef MATH_LIBRARY
  36 #define MATH_LIBRARY "-lm"
  37 #endif
  38 #ifndef MATH_LIBRARY_PROFILE
  39 #define MATH_LIBRARY_PROFILE "-lm"
  40 #endif
  41
  42 #ifndef LIBSTDCXX
  43 #define LIBSTDCXX "-lstdc++"
  44 #endif
  45 #ifndef LIBSTDCXX_PROFILE
  46 #define LIBSTDCXX_PROFILE "-lstdc++"
  47 #endif
  48
  49 void
  50 lang_specific_driver (in_argc, in_argv, in_added_libraries)
  51      int *in_argc;
  52      const char *const **in_argv;
  53      int *in_added_libraries;
  54 {
  55   int i, j;
  56
  57   /* If nonzero, the user gave us the `-p' or `-pg' flag.  */
  58   int saw_profile_flag = 0;
  59
  60   /* If nonzero, the user gave us the `-v' flag.  */
  61   int saw_verbose_flag = 0;
  62
  63   /* This is a tristate:
  64      -1 means we should not link in libstdc++
  65      0  means we should link in libstdc++ if it is needed
  66      1  means libstdc++ is needed and should be linked in.  */
  67   int library = 0;
  68
  69   /* The number of arguments being added to what's in argv, other than
  70      libraries.  We use this to track the number of times we've inserted
  71      -xc++/-xnone.  */
  72   int added = 0;
  73
  74   /* Used to track options that take arguments, so we don't go wrapping
  75      those with -xc++/-xnone.  */
  76   const char *quote = NULL;
  77
  78   /* The new argument list will be contained in this.  */
  79   const char **arglist;
  80
  81   /* Nonzero if we saw a `-xfoo' language specification on the
  82      command line.  Used to avoid adding our own -xc++ if the user
  83      already gave a language for the file.  */
  84   int saw_speclang = 0;
  85
  86   /* "-lm" or "-lmath" if it appears on the command line.  */
  87   const char *saw_math = 0;
  88
  89   /* "-lc" if it appears on the command line.  */
  90   const char *saw_libc = 0;
  91
  92   /* An array used to flag each argument that needs a bit set for
  93      LANGSPEC, MATHLIB, or WITHLIBC.  */
  94   int *args;
  95
  96   /* By default, we throw on the math library if we have one.  */
  97   int need_math = (MATH_LIBRARY[0] != '\0');
  98
  99   /* True if we should add -shared-libgcc to the command-line.  */
 100   int shared_libgcc = 1;
 101
 102   /* The total number of arguments with the new stuff.  */
 103   int argc;
 104
 105   /* The argument list.  */
 106   const char *const *argv;
 107
 108   /* The number of libraries added in.  */
 109   int added_libraries;
 110
 111   /* The total number of arguments with the new stuff.  */
 112   int num_args = 1;
 113
 114   argc = *in_argc;
 115   argv = *in_argv;
 116   added_libraries = *in_added_libraries;
 117
 118   args = (int *) xcalloc (argc, sizeof (int));
 119
 120   for (i = 1; i < argc; i++)
 121     {
 122       /* If the previous option took an argument, we swallow it here.  */
 123       if (quote)
 124         {
 125           quote = NULL;
 126           continue;
 127         }
 128
 129       /* We don't do this anymore, since we don't get them with minus
 130          signs on them.  */
 131       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 132         continue;
 133
 134       if (argv[i][0] == '-')
 135         {
 136           if (strcmp (argv[i], "-nostdlib") == 0
 137               || strcmp (argv[i], "-nodefaultlibs") == 0)
 138             {
 139               library = -1;
 140             }
 141           else if (strcmp (argv[i], "-lm") == 0
 142                    || strcmp (argv[i], "-lmath") == 0
 143                    || strcmp (argv[i], MATH_LIBRARY) == 0
 144 #ifdef ALT_LIBM
 145                    || strcmp (argv[i], ALT_LIBM) == 0
 146 #endif
 147                   )
 148             {
 149               args[i] |= MATHLIB;
 150               need_math = 0;
 151             }
 152           else if (strcmp (argv[i], "-lc") == 0)
 153             args[i] |= WITHLIBC;
 154           else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0)
 155             saw_profile_flag++;
 156           else if (strcmp (argv[i], "-v") == 0)
 157             saw_verbose_flag = 1;
 158           else if (strncmp (argv[i], "-x", 2) == 0)
 159             {
 160               if (library == 0)
 161                 {
 162                   const char * arg;
 163                   if (argv[i][2] != '\0')
 164                     arg = argv[i]+2;
 165                   else if (argv[i+1] != NULL)
 166                     arg = argv[i+1];
 167                   else  /* Error condition, message will be printed later.  */
 168                     arg = "";
 169                   if (strcmp (arg, "c++") == 0
 170                       || strcmp (arg, "c++-cpp-output") == 0)
 171                     library = 1;
 172                 }
 173               saw_speclang = 1;
 174             }
 175           else if (((argv[i][2] == '\0'
 176                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 177                     || strcmp (argv[i], "-Xlinker") == 0
 178                     || strcmp (argv[i], "-Tdata") == 0))
 179             quote = argv[i];
 180           else if ((argv[i][2] == '\0'
 181                     && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 182                    || strcmp (argv[i], "-MM") == 0
 183                    || strcmp (argv[i], "-fsyntax-only") == 0)
 184             {
 185               /* Don't specify libraries if we won't link, since that would
 186                  cause a warning.  */
 187               library = -1;
 188             }
 189           else if (strcmp (argv[i], "-static-libgcc") == 0
 190                    || strcmp (argv[i], "-static") == 0)
 191             shared_libgcc = 0;
 192           else
 193             /* Pass other options through.  */
 194             continue;
 195         }
 196       else
 197         {
 198           int len;
 199
 200           if (saw_speclang)
 201             {
 202               saw_speclang = 0;
 203               continue;
 204             }
 205
 206           /* If the filename ends in .[chi], put options around it.
 207              But not if a specified -x option is currently active.  */
 208           len = strlen (argv[i]);
 209           if (len > 2
 210               && (argv[i][len - 1] == 'c'
 211                   || argv[i][len - 1] == 'i'
 212                   || argv[i][len - 1] == 'h')
 213               && argv[i][len - 2] == '.')
 214             {
 215               args[i] |= LANGSPEC;
 216               added += 2;
 217             }
 218
 219           /* If we don't know that this is a header file, we might
 220              need to be linking in the libraries.  */
 221           if (library == 0)
 222             {
 223               if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
 224                   && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
 225                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
 226                 library = 1;
 227             }
 228         }
 229     }
 230
 231   if (quote)
 232     fatal ("argument to `%s' missing\n", quote);
 233
 234   /* If we know we don't have to do anything, bail now.  */
 235   if (! added && library <= 0)
 236     {
 237       free (args);
 238       return;
 239     }
 240
 241   /* There's no point adding -shared-libgcc if we don't have a shared
 242      libgcc.  */
 243 #ifndef ENABLE_SHARED_LIBGCC
 244   shared_libgcc = 0;
 245 #endif
 246
 247   /* Make sure to have room for the trailing NULL argument.  */
 248   num_args = argc + added + need_math + shared_libgcc + (library > 0) + 1;
 249   arglist = (const char **) xmalloc (num_args * sizeof (char *));
 250
 251   i = 0;
 252   j = 0;
 253
 254   /* Copy the 0th argument, i.e., the name of the program itself.  */
 255   arglist[i++] = argv[j++];
 256
 257   /* NOTE: We start at 1 now, not 0.  */
 258   while (i < argc)
 259     {
 260       arglist[j] = argv[i];
 261
 262       /* Make sure -lstdc++ is before the math library, since libstdc++
 263          itself uses those math routines.  */
 264       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 265         {
 266           --j;
 267           saw_math = argv[i];
 268         }
 269
 270       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 271         {
 272           --j;
 273           saw_libc = argv[i];
 274         }
 275
 276       /* Wrap foo.[chi] files in a language specification to
 277          force the gcc compiler driver to run cc1plus on them.  */
 278       if (args[i] & LANGSPEC)
 279         {
 280           int len = strlen (argv[i]);
 281           switch (argv[i][len - 1])
 282             {
 283             case 'c':
 284               arglist[j++] = "-xc++";
 285               break;
 286             case 'i':
 287               arglist[j++] = "-xc++-cpp-output";
 288               break;
 289             case 'h':
 290               arglist[j++] = "-xc++-header";
 291               break;
 292             default:
 293               abort ();
 294             }
 295           arglist[j++] = argv[i];
 296           arglist[j] = "-xnone";
 297         }
 298
 299       i++;
 300       j++;
 301     }
 302
 303   /* Add `-lstdc++' if we haven't already done so.  */
 304   if (library > 0)
 305     {
 306       arglist[j++] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 307       added_libraries++;
 308 #ifdef USE_LIBUNWIND_EXCEPTIONS
 309 # ifndef LIBUNWIND
 310 #  define LIBUNWIND "-lunwind"
 311 # endif
 312       arglist[j++] = LIBUNWIND;
 313       added_libraries++;
 314 #endif
 315     }
 316   if (saw_math)
 317     arglist[j++] = saw_math;
 318   else if (library > 0 && need_math)
 319     {
 320       arglist[j++] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 321       added_libraries++;
 322     }
 323   if (saw_libc)
 324     arglist[j++] = saw_libc;
 325   if (shared_libgcc)
 326     arglist[j++] = "-shared-libgcc";
 327
 328   arglist[j] = NULL;
 329
 330   *in_argc = j;
 331   *in_argv = arglist;
 332   *in_added_libraries = added_libraries;
 333 }
 334
 335 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 336 int lang_specific_pre_link ()  /* Not used for C++.  */
 337 {
 338   return 0;
 339 }
 340
 341 /* Number of extra output files that lang_specific_pre_link may generate.  */
 342 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */
 343
 344 /* Table of language-specific spec functions.  */
 345 const struct spec_function lang_specific_spec_functions[] =
 346 {
 347   { 0, 0 }
 348 };