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, 2004,
   3    2007, 2008, 2009, 2010 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  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 /* Skip this option.  */
  34 #define SKIPOPT         (1<<4)
  35
  36 #ifndef MATH_LIBRARY
  37 #define MATH_LIBRARY "-lm"
  38 #endif
  39 #ifndef MATH_LIBRARY_PROFILE
  40 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
  41 #endif
  42
  43 #ifndef LIBSTDCXX
  44 #define LIBSTDCXX "-lstdc++"
  45 #endif
  46 #ifndef LIBSTDCXX_PROFILE
  47 #define LIBSTDCXX_PROFILE LIBSTDCXX
  48 #endif
  49 #ifndef LIBSTDCXX_STATIC
  50 #define LIBSTDCXX_STATIC NULL
  51 #endif
  52
  53 void
  54 lang_specific_driver (int *in_argc, const char *const **in_argv,
  55                       int *in_added_libraries)
  56 {
  57   int i, j;
  58
  59   /* If nonzero, the user gave us the `-p' or `-pg' flag.  */
  60   int saw_profile_flag = 0;
  61
  62   /* What do with libstdc++:
  63      -1 means we should not link in libstdc++
  64      0  means we should link in libstdc++ if it is needed
  65      1  means libstdc++ is needed and should be linked in.
  66      2  means libstdc++ is needed and should be linked statically.  */
  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 saw -static.  */
 100   int static_link = 0;
 101
 102   /* True if we should add -shared-libgcc to the command-line.  */
 103   int shared_libgcc = 1;
 104
 105   /* The total number of arguments with the new stuff.  */
 106   int argc;
 107
 108   /* The argument list.  */
 109   const char *const *argv;
 110
 111   /* The number of libraries added in.  */
 112   int added_libraries;
 113
 114   /* The total number of arguments with the new stuff.  */
 115   int num_args = 1;
 116
 117   argc = *in_argc;
 118   argv = *in_argv;
 119   added_libraries = *in_added_libraries;
 120
 121   args = XCNEWVEC (int, argc);
 122
 123   for (i = 1; i < argc; i++)
 124     {
 125       /* If the previous option took an argument, we swallow it here.  */
 126       if (quote)
 127         {
 128           quote = NULL;
 129           continue;
 130         }
 131
 132       /* We don't do this anymore, since we don't get them with minus
 133          signs on them.  */
 134       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 135         continue;
 136
 137       if (argv[i][0] == '-')
 138         {
 139           if (strcmp (argv[i], "-nostdlib") == 0
 140               || strcmp (argv[i], "-nodefaultlibs") == 0)
 141             {
 142               library = -1;
 143             }
 144           else if (strcmp (argv[i], MATH_LIBRARY) == 0)
 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 (strncmp (argv[i], "-x", 2) == 0)
 154             {
 155               const char * arg;
 156               if (argv[i][2] != '\0')
 157                 arg = argv[i]+2;
 158               else if ((argv[i+1]) != NULL)
 159                 /* We need to swallow arg on next loop.  */
 160                 quote = arg = argv[i+1];
 161               else  /* Error condition, message will be printed later.  */
 162                 arg = "";
 163               if (library == 0
 164                   && (strcmp (arg, "c++") == 0
 165                       || strcmp (arg, "c++-cpp-output") == 0
 166                       || strcmp (arg, "objective-c++") == 0
 167                       || strcmp (arg, "objective-c++-cpp-output") == 0))
 168                 library = 1;
 169
 170               saw_speclang = 1;
 171             }
 172           else if (strcmp (argv[i], "-ObjC++") == 0)
 173             {
 174               if (library == 0)
 175                 library = 1;
 176               saw_speclang = 1;
 177             }
 178           /* Arguments that go directly to the linker might be .o files,
 179              or something, and so might cause libstdc++ to be needed.  */
 180           else if (strcmp (argv[i], "-Xlinker") == 0)
 181             {
 182               quote = argv[i];
 183               if (library == 0)
 184                 library = 1;
 185             }
 186           else if (strncmp (argv[i], "-Wl,", 4) == 0)
 187             library = (library == 0) ? 1 : library;
 188           /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 189           else if (strncmp (argv[i], "-l", 2) == 0)
 190             library = (library == 0) ? 1 : library;
 191           else if (((argv[i][2] == '\0'
 192                      && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 193                     || strcmp (argv[i], "-Tdata") == 0))
 194             quote = argv[i];
 195           else if ((argv[i][2] == '\0'
 196                     && strchr ("cSEM", argv[i][1]) != NULL)
 197                    || strcmp (argv[i], "-MM") == 0
 198                    || strcmp (argv[i], "-fsyntax-only") == 0)
 199             {
 200               /* Don't specify libraries if we won't link, since that would
 201                  cause a warning.  */
 202               library = -1;
 203             }
 204           else if (strcmp (argv[i], "-static") == 0)
 205             static_link = 1;
 206           else if (strcmp (argv[i], "-static-libgcc") == 0)
 207             shared_libgcc = 0;
 208           else if (strcmp (argv[i], "-static-libstdc++") == 0)
 209             {
 210               library = library >= 0 ? 2 : library;
 211               args[i] |= SKIPOPT;
 212             }
 213           else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1]))
 214             i++;
 215           else
 216             /* Pass other options through.  */
 217             continue;
 218         }
 219       else
 220         {
 221           int len;
 222
 223           if (saw_speclang)
 224             {
 225               saw_speclang = 0;
 226               continue;
 227             }
 228
 229           /* If the filename ends in .[chi], put options around it.
 230              But not if a specified -x option is currently active.  */
 231           len = strlen (argv[i]);
 232           if (len > 2
 233               && (argv[i][len - 1] == 'c'
 234                   || argv[i][len - 1] == 'i'
 235                   || argv[i][len - 1] == 'h')
 236               && argv[i][len - 2] == '.')
 237             {
 238               args[i] |= LANGSPEC;
 239               added += 2;
 240             }
 241
 242           /* If we don't know that this is a header file, we might
 243              need to be linking in the libraries.  */
 244           if (library == 0)
 245             {
 246               if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
 247                   && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
 248                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hpp") != 0)
 249                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hp") != 0)
 250                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hxx") != 0)
 251                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".h++") != 0)
 252                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".HPP") != 0)
 253                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".tcc") != 0)
 254                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
 255                 library = 1;
 256             }
 257         }
 258     }
 259
 260   if (quote)
 261     fatal_error ("argument to %qs missing", quote);
 262
 263   /* There's no point adding -shared-libgcc if we don't have a shared
 264      libgcc.  */
 265 #ifndef ENABLE_SHARED_LIBGCC
 266   shared_libgcc = 0;
 267 #endif
 268
 269   /* Make sure to have room for the trailing NULL argument.
 270      Add one for shared_libgcc or extra static library.  */
 271   num_args = argc + added + need_math + (library > 0) * 4 + 2;
 272   arglist = XNEWVEC (const char *, num_args);
 273
 274   i = 0;
 275   j = 0;
 276
 277   /* Copy the 0th argument, i.e., the name of the program itself.  */
 278   arglist[i++] = argv[j++];
 279
 280   /* NOTE: We start at 1 now, not 0.  */
 281   while (i < argc)
 282     {
 283       arglist[j] = argv[i];
 284
 285       /* Make sure -lstdc++ is before the math library, since libstdc++
 286          itself uses those math routines.  */
 287       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 288         {
 289           --j;
 290           saw_math = argv[i];
 291         }
 292
 293       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 294         {
 295           --j;
 296           saw_libc = argv[i];
 297         }
 298
 299       /* Wrap foo.[chi] files in a language specification to
 300          force the gcc compiler driver to run cc1plus on them.  */
 301       if (args[i] & LANGSPEC)
 302         {
 303           int len = strlen (argv[i]);
 304           switch (argv[i][len - 1])
 305             {
 306             case 'c':
 307               arglist[j++] = "-xc++";
 308               break;
 309             case 'i':
 310               arglist[j++] = "-xc++-cpp-output";
 311               break;
 312             case 'h':
 313               arglist[j++] = "-xc++-header";
 314               break;
 315             default:
 316               gcc_unreachable ();
 317             }
 318           arglist[j++] = argv[i];
 319           arglist[j] = "-xnone";
 320         }
 321
 322       if ((args[i] & SKIPOPT) != 0)
 323         --j;
 324
 325       i++;
 326       j++;
 327     }
 328
 329   /* Add `-lstdc++' if we haven't already done so.  */
 330   if (library > 0)
 331     {
 332 #ifdef HAVE_LD_STATIC_DYNAMIC
 333       if (library > 1 && !static_link)
 334         {
 335           arglist[j] = "-Wl,-Bstatic";
 336           j++;
 337         }
 338 #endif
 339       arglist[j] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 340       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 341         added_libraries++;
 342       j++;
 343       /* Add target-dependent static library, if necessary.  */
 344       if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
 345         {
 346           arglist[j] = LIBSTDCXX_STATIC;
 347           if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 348             added_libraries++;
 349           j++;
 350         }
 351 #ifdef HAVE_LD_STATIC_DYNAMIC
 352       if (library > 1 && !static_link)
 353         {
 354           arglist[j] = "-Wl,-Bdynamic";
 355           j++;
 356         }
 357 #endif
 358     }
 359   if (saw_math)
 360     arglist[j++] = saw_math;
 361   else if (library > 0 && need_math)
 362     {
 363       arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 364       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 365         added_libraries++;
 366       j++;
 367     }
 368   if (saw_libc)
 369     arglist[j++] = saw_libc;
 370   if (shared_libgcc && !static_link)
 371     arglist[j++] = "-shared-libgcc";
 372
 373   arglist[j] = NULL;
 374
 375   *in_argc = j;
 376   *in_argv = arglist;
 377   *in_added_libraries = added_libraries;
 378 }
 379
 380 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 381 int lang_specific_pre_link (void)  /* Not used for C++.  */
 382 {
 383   return 0;
 384 }
 385
 386 /* Number of extra output files that lang_specific_pre_link may generate.  */
 387 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */