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  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
  34 #ifndef MATH_LIBRARY
  35 #define MATH_LIBRARY "-lm"
  36 #endif
  37 #ifndef MATH_LIBRARY_PROFILE
  38 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
  39 #endif
  40
  41 #ifndef LIBSTDCXX
  42 #define LIBSTDCXX "-lstdc++"
  43 #endif
  44 #ifndef LIBSTDCXX_PROFILE
  45 #define LIBSTDCXX_PROFILE LIBSTDCXX
  46 #endif
  47 #ifndef LIBSTDCXX_STATIC
  48 #define LIBSTDCXX_STATIC LIBSTDCXX
  49 #endif
  50
  51 void
  52 lang_specific_driver (int *in_argc, 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 = XCNEWVEC (int, argc);
 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], MATH_LIBRARY) == 0)
 142             {
 143               args[i] |= MATHLIB;
 144               need_math = 0;
 145             }
 146           else if (strcmp (argv[i], "-lc") == 0)
 147             args[i] |= WITHLIBC;
 148           else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0)
 149             saw_profile_flag++;
 150           else if (strcmp (argv[i], "-v") == 0)
 151             saw_verbose_flag = 1;
 152           else if (strncmp (argv[i], "-x", 2) == 0)
 153             {
 154               const char * arg;
 155               if (argv[i][2] != '\0')
 156                 arg = argv[i]+2;
 157               else if ((argv[i+1]) != NULL)
 158                 /* We need to swallow arg on next loop.  */
 159                 quote = arg = argv[i+1];
 160               else  /* Error condition, message will be printed later.  */
 161                 arg = "";
 162               if (library == 0
 163                   && (strcmp (arg, "c++") == 0
 164                       || strcmp (arg, "c++-cpp-output") == 0
 165                       || strcmp (arg, "objective-c++") == 0
 166                       || strcmp (arg, "objective-c++-cpp-output") == 0))
 167                 library = 1;
 168
 169               saw_speclang = 1;
 170             }
 171           else if (strcmp (argv[i], "-ObjC++") == 0)
 172             {
 173               if (library == 0)
 174                 library = 1;
 175               saw_speclang = 1;
 176             }
 177           /* Arguments that go directly to the linker might be .o files,
 178              or something, and so might cause libstdc++ to be needed.  */
 179           else if (strcmp (argv[i], "-Xlinker") == 0)
 180             {
 181               quote = argv[i];
 182               if (library == 0)
 183                 library = 1;
 184             }
 185           else if (strncmp (argv[i], "-Wl,", 4) == 0)
 186             library = (library == 0) ? 1 : library;
 187           /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 188           else if (strncmp (argv[i], "-l", 2) == 0)
 189             library = (library == 0) ? 1 : library;
 190           else if (((argv[i][2] == '\0'
 191                      && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 192                     || strcmp (argv[i], "-Tdata") == 0))
 193             quote = argv[i];
 194           else if ((argv[i][2] == '\0'
 195                     && strchr ("cSEM", argv[i][1]) != NULL)
 196                    || strcmp (argv[i], "-MM") == 0
 197                    || strcmp (argv[i], "-fsyntax-only") == 0)
 198             {
 199               /* Don't specify libraries if we won't link, since that would
 200                  cause a warning.  */
 201               library = -1;
 202             }
 203           else if (strcmp (argv[i], "-static-libgcc") == 0
 204                    || strcmp (argv[i], "-static") == 0)
 205             shared_libgcc = 0;
 206           else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1]))
 207             i++;
 208           else
 209             /* Pass other options through.  */
 210             continue;
 211         }
 212       else
 213         {
 214           int len;
 215
 216           if (saw_speclang)
 217             {
 218               saw_speclang = 0;
 219               continue;
 220             }
 221
 222           /* If the filename ends in .[chi], put options around it.
 223              But not if a specified -x option is currently active.  */
 224           len = strlen (argv[i]);
 225           if (len > 2
 226               && (argv[i][len - 1] == 'c'
 227                   || argv[i][len - 1] == 'i'
 228                   || argv[i][len - 1] == 'h')
 229               && argv[i][len - 2] == '.')
 230             {
 231               args[i] |= LANGSPEC;
 232               added += 2;
 233             }
 234
 235           /* If we don't know that this is a header file, we might
 236              need to be linking in the libraries.  */
 237           if (library == 0)
 238             {
 239               if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
 240                   && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
 241                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hpp") != 0)
 242                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hp") != 0)
 243                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hxx") != 0)
 244                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".h++") != 0)
 245                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".HPP") != 0)
 246                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".tcc") != 0)
 247                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
 248                 library = 1;
 249             }
 250         }
 251     }
 252
 253   if (quote)
 254     fatal ("argument to '%s' missing\n", quote);
 255
 256   /* There's no point adding -shared-libgcc if we don't have a shared
 257      libgcc.  */
 258 #ifndef ENABLE_SHARED_LIBGCC
 259   shared_libgcc = 0;
 260 #endif
 261
 262   /* Make sure to have room for the trailing NULL argument.  */
 263   num_args = argc + added + need_math + shared_libgcc + (library > 0) + 1;
 264   arglist = XNEWVEC (const char *, num_args);
 265
 266   i = 0;
 267   j = 0;
 268
 269   /* Copy the 0th argument, i.e., the name of the program itself.  */
 270   arglist[i++] = argv[j++];
 271
 272   /* NOTE: We start at 1 now, not 0.  */
 273   while (i < argc)
 274     {
 275       arglist[j] = argv[i];
 276
 277       /* Make sure -lstdc++ is before the math library, since libstdc++
 278          itself uses those math routines.  */
 279       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 280         {
 281           --j;
 282           saw_math = argv[i];
 283         }
 284
 285       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 286         {
 287           --j;
 288           saw_libc = argv[i];
 289         }
 290
 291       /* Wrap foo.[chi] files in a language specification to
 292          force the gcc compiler driver to run cc1plus on them.  */
 293       if (args[i] & LANGSPEC)
 294         {
 295           int len = strlen (argv[i]);
 296           switch (argv[i][len - 1])
 297             {
 298             case 'c':
 299               arglist[j++] = "-xc++";
 300               break;
 301             case 'i':
 302               arglist[j++] = "-xc++-cpp-output";
 303               break;
 304             case 'h':
 305               arglist[j++] = "-xc++-header";
 306               break;
 307             default:
 308               gcc_unreachable ();
 309             }
 310           arglist[j++] = argv[i];
 311           arglist[j] = "-xnone";
 312         }
 313
 314       i++;
 315       j++;
 316     }
 317
 318   /* Add `-lstdc++' if we haven't already done so.  */
 319   if (library > 0)
 320     {
 321       arglist[j] = shared_libgcc == 0 ? LIBSTDCXX_STATIC
 322         : saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 323       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 324         added_libraries++;
 325       j++;
 326     }
 327   if (saw_math)
 328     arglist[j++] = saw_math;
 329   else if (library > 0 && need_math)
 330     {
 331       arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 332       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 333         added_libraries++;
 334       j++;
 335     }
 336   if (saw_libc)
 337     arglist[j++] = saw_libc;
 338   if (shared_libgcc)
 339     arglist[j++] = "-shared-libgcc";
 340
 341   arglist[j] = NULL;
 342
 343   *in_argc = j;
 344   *in_argv = arglist;
 345   *in_added_libraries = added_libraries;
 346 }
 347
 348 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 349 int lang_specific_pre_link (void)  /* Not used for C++.  */
 350 {
 351   return 0;
 352 }
 353
 354 /* Number of extra output files that lang_specific_pre_link may generate.  */
 355 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */