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 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   /* If nonzero, the user gave us the `-v' flag.  */
  63   int saw_verbose_flag = 0;
  64
  65   /* What do with libstdc++:
  66      -1 means we should not link in libstdc++
  67      0  means we should link in libstdc++ if it is needed
  68      1  means libstdc++ is needed and should be linked in.
  69      2  means libstdc++ is needed and should be linked statically.  */
  70   int library = 0;
  71
  72   /* The number of arguments being added to what's in argv, other than
  73      libraries.  We use this to track the number of times we've inserted
  74      -xc++/-xnone.  */
  75   int added = 0;
  76
  77   /* Used to track options that take arguments, so we don't go wrapping
  78      those with -xc++/-xnone.  */
  79   const char *quote = NULL;
  80
  81   /* The new argument list will be contained in this.  */
  82   const char **arglist;
  83
  84   /* Nonzero if we saw a `-xfoo' language specification on the
  85      command line.  Used to avoid adding our own -xc++ if the user
  86      already gave a language for the file.  */
  87   int saw_speclang = 0;
  88
  89   /* "-lm" or "-lmath" if it appears on the command line.  */
  90   const char *saw_math = 0;
  91
  92   /* "-lc" if it appears on the command line.  */
  93   const char *saw_libc = 0;
  94
  95   /* An array used to flag each argument that needs a bit set for
  96      LANGSPEC, MATHLIB, or WITHLIBC.  */
  97   int *args;
  98
  99   /* By default, we throw on the math library if we have one.  */
 100   int need_math = (MATH_LIBRARY[0] != '\0');
 101
 102   /* True if we saw -static.  */
 103   int static_link = 0;
 104
 105   /* True if we should add -shared-libgcc to the command-line.  */
 106   int shared_libgcc = 1;
 107
 108   /* The total number of arguments with the new stuff.  */
 109   int argc;
 110
 111   /* The argument list.  */
 112   const char *const *argv;
 113
 114   /* The number of libraries added in.  */
 115   int added_libraries;
 116
 117   /* The total number of arguments with the new stuff.  */
 118   int num_args = 1;
 119
 120   argc = *in_argc;
 121   argv = *in_argv;
 122   added_libraries = *in_added_libraries;
 123
 124   args = XCNEWVEC (int, argc);
 125
 126   for (i = 1; i < argc; i++)
 127     {
 128       /* If the previous option took an argument, we swallow it here.  */
 129       if (quote)
 130         {
 131           quote = NULL;
 132           continue;
 133         }
 134
 135       /* We don't do this anymore, since we don't get them with minus
 136          signs on them.  */
 137       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 138         continue;
 139
 140       if (argv[i][0] == '-')
 141         {
 142           if (strcmp (argv[i], "-nostdlib") == 0
 143               || strcmp (argv[i], "-nodefaultlibs") == 0)
 144             {
 145               library = -1;
 146             }
 147           else if (strcmp (argv[i], MATH_LIBRARY) == 0)
 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               const char * arg;
 161               if (argv[i][2] != '\0')
 162                 arg = argv[i]+2;
 163               else if ((argv[i+1]) != NULL)
 164                 /* We need to swallow arg on next loop.  */
 165                 quote = arg = argv[i+1];
 166               else  /* Error condition, message will be printed later.  */
 167                 arg = "";
 168               if (library == 0
 169                   && (strcmp (arg, "c++") == 0
 170                       || strcmp (arg, "c++-cpp-output") == 0
 171                       || strcmp (arg, "objective-c++") == 0
 172                       || strcmp (arg, "objective-c++-cpp-output") == 0))
 173                 library = 1;
 174
 175               saw_speclang = 1;
 176             }
 177           else if (strcmp (argv[i], "-ObjC++") == 0)
 178             {
 179               if (library == 0)
 180                 library = 1;
 181               saw_speclang = 1;
 182             }
 183           /* Arguments that go directly to the linker might be .o files,
 184              or something, and so might cause libstdc++ to be needed.  */
 185           else if (strcmp (argv[i], "-Xlinker") == 0)
 186             {
 187               quote = argv[i];
 188               if (library == 0)
 189                 library = 1;
 190             }
 191           else if (strncmp (argv[i], "-Wl,", 4) == 0)
 192             library = (library == 0) ? 1 : library;
 193           /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 194           else if (strncmp (argv[i], "-l", 2) == 0)
 195             library = (library == 0) ? 1 : library;
 196           else if (((argv[i][2] == '\0'
 197                      && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 198                     || strcmp (argv[i], "-Tdata") == 0))
 199             quote = argv[i];
 200           else if ((argv[i][2] == '\0'
 201                     && strchr ("cSEM", argv[i][1]) != NULL)
 202                    || strcmp (argv[i], "-MM") == 0
 203                    || strcmp (argv[i], "-fsyntax-only") == 0)
 204             {
 205               /* Don't specify libraries if we won't link, since that would
 206                  cause a warning.  */
 207               library = -1;
 208             }
 209           else if (strcmp (argv[i], "-static") == 0)
 210             static_link = 1;
 211           else if (strcmp (argv[i], "-static-libgcc") == 0)
 212             shared_libgcc = 0;
 213           else if (strcmp (argv[i], "-static-libstdc++") == 0)
 214             {
 215               library = library >= 0 ? 2 : library;
 216               args[i] |= SKIPOPT;
 217             }
 218           else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1]))
 219             i++;
 220           else
 221             /* Pass other options through.  */
 222             continue;
 223         }
 224       else
 225         {
 226           int len;
 227
 228           if (saw_speclang)
 229             {
 230               saw_speclang = 0;
 231               continue;
 232             }
 233
 234           /* If the filename ends in .[chi], put options around it.
 235              But not if a specified -x option is currently active.  */
 236           len = strlen (argv[i]);
 237           if (len > 2
 238               && (argv[i][len - 1] == 'c'
 239                   || argv[i][len - 1] == 'i'
 240                   || argv[i][len - 1] == 'h')
 241               && argv[i][len - 2] == '.')
 242             {
 243               args[i] |= LANGSPEC;
 244               added += 2;
 245             }
 246
 247           /* If we don't know that this is a header file, we might
 248              need to be linking in the libraries.  */
 249           if (library == 0)
 250             {
 251               if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
 252                   && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
 253                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hpp") != 0)
 254                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hp") != 0)
 255                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hxx") != 0)
 256                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".h++") != 0)
 257                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".HPP") != 0)
 258                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".tcc") != 0)
 259                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
 260                 library = 1;
 261             }
 262         }
 263     }
 264
 265   if (quote)
 266     fatal ("argument to '%s' missing\n", quote);
 267
 268   /* There's no point adding -shared-libgcc if we don't have a shared
 269      libgcc.  */
 270 #ifndef ENABLE_SHARED_LIBGCC
 271   shared_libgcc = 0;
 272 #endif
 273
 274   /* Make sure to have room for the trailing NULL argument.
 275      Add one for shared_libgcc or extra static library.  */
 276   num_args = argc + added + need_math + (library > 0) * 4 + 2;
 277   arglist = XNEWVEC (const char *, num_args);
 278
 279   i = 0;
 280   j = 0;
 281
 282   /* Copy the 0th argument, i.e., the name of the program itself.  */
 283   arglist[i++] = argv[j++];
 284
 285   /* NOTE: We start at 1 now, not 0.  */
 286   while (i < argc)
 287     {
 288       arglist[j] = argv[i];
 289
 290       /* Make sure -lstdc++ is before the math library, since libstdc++
 291          itself uses those math routines.  */
 292       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 293         {
 294           --j;
 295           saw_math = argv[i];
 296         }
 297
 298       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 299         {
 300           --j;
 301           saw_libc = argv[i];
 302         }
 303
 304       /* Wrap foo.[chi] files in a language specification to
 305          force the gcc compiler driver to run cc1plus on them.  */
 306       if (args[i] & LANGSPEC)
 307         {
 308           int len = strlen (argv[i]);
 309           switch (argv[i][len - 1])
 310             {
 311             case 'c':
 312               arglist[j++] = "-xc++";
 313               break;
 314             case 'i':
 315               arglist[j++] = "-xc++-cpp-output";
 316               break;
 317             case 'h':
 318               arglist[j++] = "-xc++-header";
 319               break;
 320             default:
 321               gcc_unreachable ();
 322             }
 323           arglist[j++] = argv[i];
 324           arglist[j] = "-xnone";
 325         }
 326
 327       if ((args[i] & SKIPOPT) != 0)
 328         --j;
 329
 330       i++;
 331       j++;
 332     }
 333
 334   /* Add `-lstdc++' if we haven't already done so.  */
 335   if (library > 0)
 336     {
 337 #ifdef HAVE_LD_STATIC_DYNAMIC
 338       if (library > 1 && !static_link)
 339         {
 340           arglist[j] = "-Wl,-Bstatic";
 341           j++;
 342         }
 343 #endif
 344       arglist[j] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 345       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 346         added_libraries++;
 347       j++;
 348       /* Add target-dependent static library, if necessary.  */
 349       if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
 350         {
 351           arglist[j] = LIBSTDCXX_STATIC;
 352           if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 353             added_libraries++;
 354           j++;
 355         }
 356 #ifdef HAVE_LD_STATIC_DYNAMIC
 357       if (library > 1 && !static_link)
 358         {
 359           arglist[j] = "-Wl,-Bdynamic";
 360           j++;
 361         }
 362 #endif
 363     }
 364   if (saw_math)
 365     arglist[j++] = saw_math;
 366   else if (library > 0 && need_math)
 367     {
 368       arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 369       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 370         added_libraries++;
 371       j++;
 372     }
 373   if (saw_libc)
 374     arglist[j++] = saw_libc;
 375   if (shared_libgcc && !static_link)
 376     arglist[j++] = "-shared-libgcc";
 377
 378   arglist[j] = NULL;
 379
 380   *in_argc = j;
 381   *in_argv = arglist;
 382   *in_added_libraries = added_libraries;
 383 }
 384
 385 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 386 int lang_specific_pre_link (void)  /* Not used for C++.  */
 387 {
 388   return 0;
 389 }
 390
 391 /* Number of extra output files that lang_specific_pre_link may generate.  */
 392 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */