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  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
  48 void
  49 lang_specific_driver (int *in_argc, const char *const **in_argv,
  50                       int *in_added_libraries)
  51 {
  52   int i, j;
  53
  54   /* If nonzero, the user gave us the `-p' or `-pg' flag.  */
  55   int saw_profile_flag = 0;
  56
  57   /* If nonzero, the user gave us the `-v' flag.  */
  58   int saw_verbose_flag = 0;
  59
  60   /* This is a tristate:
  61      -1 means we should not link in libstdc++
  62      0  means we should link in libstdc++ if it is needed
  63      1  means libstdc++ is needed and should be linked in.  */
  64   int library = 0;
  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 = 0;
  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 = XCNEWVEC (int, argc);
 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 (strcmp (argv[i], "-nostdlib") == 0
 134               || strcmp (argv[i], "-nodefaultlibs") == 0)
 135             {
 136               library = -1;
 137             }
 138           else if (strcmp (argv[i], MATH_LIBRARY) == 0)
 139             {
 140               args[i] |= MATHLIB;
 141               need_math = 0;
 142             }
 143           else if (strcmp (argv[i], "-lc") == 0)
 144             args[i] |= WITHLIBC;
 145           else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0)
 146             saw_profile_flag++;
 147           else if (strcmp (argv[i], "-v") == 0)
 148             saw_verbose_flag = 1;
 149           else if (strncmp (argv[i], "-x", 2) == 0)
 150             {
 151               const char * arg;
 152               if (argv[i][2] != '\0')
 153                 arg = argv[i]+2;
 154               else if ((argv[i+1]) != NULL)
 155                 /* We need to swallow arg on next loop.  */
 156                 quote = arg = argv[i+1];
 157               else  /* Error condition, message will be printed later.  */
 158                 arg = "";
 159               if (library == 0
 160                   && (strcmp (arg, "c++") == 0
 161                       || strcmp (arg, "c++-cpp-output") == 0
 162                       || strcmp (arg, "objective-c++") == 0
 163                       || strcmp (arg, "objective-c++-cpp-output") == 0))
 164                 library = 1;
 165
 166               saw_speclang = 1;
 167             }
 168           else if (strcmp (argv[i], "-ObjC++") == 0)
 169             {
 170               if (library == 0)
 171                 library = 1;
 172               saw_speclang = 1;
 173             }
 174           /* Arguments that go directly to the linker might be .o files,
 175              or something, and so might cause libstdc++ to be needed.  */
 176           else if (strcmp (argv[i], "-Xlinker") == 0)
 177             {
 178               quote = argv[i];
 179               if (library == 0)
 180                 library = 1;
 181             }
 182           else if (strncmp (argv[i], "-Wl,", 4) == 0)
 183             library = (library == 0) ? 1 : library;
 184           /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 185           else if (strncmp (argv[i], "-l", 2) == 0)
 186             library = (library == 0) ? 1 : library;
 187           else if (((argv[i][2] == '\0'
 188                      && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 189                     || strcmp (argv[i], "-Tdata") == 0))
 190             quote = argv[i];
 191           else if ((argv[i][2] == '\0'
 192                     && strchr ("cSEM", argv[i][1]) != NULL)
 193                    || strcmp (argv[i], "-MM") == 0
 194                    || strcmp (argv[i], "-fsyntax-only") == 0)
 195             {
 196               /* Don't specify libraries if we won't link, since that would
 197                  cause a warning.  */
 198               library = -1;
 199             }
 200           else if (strcmp (argv[i], "-static-libgcc") == 0
 201                    || strcmp (argv[i], "-static") == 0)
 202             shared_libgcc = 0;
 203           else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1]))
 204             i++;
 205           else
 206             /* Pass other options through.  */
 207             continue;
 208         }
 209       else
 210         {
 211           int len;
 212
 213           if (saw_speclang)
 214             {
 215               saw_speclang = 0;
 216               continue;
 217             }
 218
 219           /* If the filename ends in .[chi], put options around it.
 220              But not if a specified -x option is currently active.  */
 221           len = strlen (argv[i]);
 222           if (len > 2
 223               && (argv[i][len - 1] == 'c'
 224                   || argv[i][len - 1] == 'i'
 225                   || argv[i][len - 1] == 'h')
 226               && argv[i][len - 2] == '.')
 227             {
 228               args[i] |= LANGSPEC;
 229               added += 2;
 230             }
 231
 232           /* If we don't know that this is a header file, we might
 233              need to be linking in the libraries.  */
 234           if (library == 0)
 235             {
 236               if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
 237                   && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
 238                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hpp") != 0)
 239                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hp") != 0)
 240                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".hxx") != 0)
 241                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".h++") != 0)
 242                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".HPP") != 0)
 243                   && (len <= 4 || strcmp (argv[i] + (len - 4), ".tcc") != 0)
 244                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
 245                 library = 1;
 246             }
 247         }
 248     }
 249
 250   if (quote)
 251     fatal ("argument to '%s' missing\n", quote);
 252
 253   /* There's no point adding -shared-libgcc if we don't have a shared
 254      libgcc.  */
 255 #ifndef ENABLE_SHARED_LIBGCC
 256   shared_libgcc = 0;
 257 #endif
 258
 259   /* Make sure to have room for the trailing NULL argument.  */
 260   num_args = argc + added + need_math + shared_libgcc + (library > 0) + 1;
 261   arglist = XNEWVEC (const char *, num_args);
 262
 263   i = 0;
 264   j = 0;
 265
 266   /* Copy the 0th argument, i.e., the name of the program itself.  */
 267   arglist[i++] = argv[j++];
 268
 269   /* NOTE: We start at 1 now, not 0.  */
 270   while (i < argc)
 271     {
 272       arglist[j] = argv[i];
 273
 274       /* Make sure -lstdc++ is before the math library, since libstdc++
 275          itself uses those math routines.  */
 276       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 277         {
 278           --j;
 279           saw_math = argv[i];
 280         }
 281
 282       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 283         {
 284           --j;
 285           saw_libc = argv[i];
 286         }
 287
 288       /* Wrap foo.[chi] files in a language specification to
 289          force the gcc compiler driver to run cc1plus on them.  */
 290       if (args[i] & LANGSPEC)
 291         {
 292           int len = strlen (argv[i]);
 293           switch (argv[i][len - 1])
 294             {
 295             case 'c':
 296               arglist[j++] = "-xc++";
 297               break;
 298             case 'i':
 299               arglist[j++] = "-xc++-cpp-output";
 300               break;
 301             case 'h':
 302               arglist[j++] = "-xc++-header";
 303               break;
 304             default:
 305               gcc_unreachable ();
 306             }
 307           arglist[j++] = argv[i];
 308           arglist[j] = "-xnone";
 309         }
 310
 311       i++;
 312       j++;
 313     }
 314
 315   /* Add `-lstdc++' if we haven't already done so.  */
 316   if (library > 0)
 317     {
 318       arglist[j] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 319       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 320         added_libraries++;
 321       j++;
 322     }
 323   if (saw_math)
 324     arglist[j++] = saw_math;
 325   else if (library > 0 && need_math)
 326     {
 327       arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 328       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 329         added_libraries++;
 330       j++;
 331     }
 332   if (saw_libc)
 333     arglist[j++] = saw_libc;
 334   if (shared_libgcc)
 335     arglist[j++] = "-shared-libgcc";
 336
 337   arglist[j] = NULL;
 338
 339   *in_argc = j;
 340   *in_argv = arglist;
 341   *in_added_libraries = added_libraries;
 342 }
 343
 344 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 345 int lang_specific_pre_link (void)  /* Not used for C++.  */
 346 {
 347   return 0;
 348 }
 349
 350 /* Number of extra output files that lang_specific_pre_link may generate.  */
 351 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */