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    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, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, 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 MATH_LIBRARY
  40 #endif
  41
  42 #ifndef LIBSTDCXX
  43 #define LIBSTDCXX "-lstdc++"
  44 #endif
  45 #ifndef LIBSTDCXX_PROFILE
  46 #define LIBSTDCXX_PROFILE LIBSTDCXX
  47 #endif
  48
  49 void
  50 lang_specific_driver (int *in_argc, const char *const **in_argv,
  51                       int *in_added_libraries)
  52 {
  53   int i, j;
  54
  55   /* If nonzero, the user gave us the `-p' or `-pg' flag.  */
  56   int saw_profile_flag = 0;
  57
  58   /* If nonzero, the user gave us the `-v' flag.  */
  59   int saw_verbose_flag = 0;
  60
  61   /* This is a tristate:
  62      -1 means we should not link in libstdc++
  63      0  means we should link in libstdc++ if it is needed
  64      1  means libstdc++ is needed and should be linked in.  */
  65   int library = 0;
  66
  67   /* The number of arguments being added to what's in argv, other than
  68      libraries.  We use this to track the number of times we've inserted
  69      -xc++/-xnone.  */
  70   int added = 0;
  71
  72   /* Used to track options that take arguments, so we don't go wrapping
  73      those with -xc++/-xnone.  */
  74   const char *quote = NULL;
  75
  76   /* The new argument list will be contained in this.  */
  77   const char **arglist;
  78
  79   /* Nonzero if we saw a `-xfoo' language specification on the
  80      command line.  Used to avoid adding our own -xc++ if the user
  81      already gave a language for the file.  */
  82   int saw_speclang = 0;
  83
  84   /* "-lm" or "-lmath" if it appears on the command line.  */
  85   const char *saw_math = 0;
  86
  87   /* "-lc" if it appears on the command line.  */
  88   const char *saw_libc = 0;
  89
  90   /* An array used to flag each argument that needs a bit set for
  91      LANGSPEC, MATHLIB, or WITHLIBC.  */
  92   int *args;
  93
  94   /* By default, we throw on the math library if we have one.  */
  95   int need_math = (MATH_LIBRARY[0] != '\0');
  96
  97   /* True if we should add -shared-libgcc to the command-line.  */
  98   int shared_libgcc = 1;
  99
 100   /* The total number of arguments with the new stuff.  */
 101   int argc;
 102
 103   /* The argument list.  */
 104   const char *const *argv;
 105
 106   /* The number of libraries added in.  */
 107   int added_libraries;
 108
 109   /* The total number of arguments with the new stuff.  */
 110   int num_args = 1;
 111
 112   argc = *in_argc;
 113   argv = *in_argv;
 114   added_libraries = *in_added_libraries;
 115
 116   args = XCNEWVEC (int, argc);
 117
 118   for (i = 1; i < argc; i++)
 119     {
 120       /* If the previous option took an argument, we swallow it here.  */
 121       if (quote)
 122         {
 123           quote = NULL;
 124           continue;
 125         }
 126
 127       /* We don't do this anymore, since we don't get them with minus
 128          signs on them.  */
 129       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 130         continue;
 131
 132       if (argv[i][0] == '-')
 133         {
 134           if (strcmp (argv[i], "-nostdlib") == 0
 135               || strcmp (argv[i], "-nodefaultlibs") == 0)
 136             {
 137               library = -1;
 138             }
 139           else if (strcmp (argv[i], MATH_LIBRARY) == 0)
 140             {
 141               args[i] |= MATHLIB;
 142               need_math = 0;
 143             }
 144           else if (strcmp (argv[i], "-lc") == 0)
 145             args[i] |= WITHLIBC;
 146           else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0)
 147             saw_profile_flag++;
 148           else if (strcmp (argv[i], "-v") == 0)
 149             saw_verbose_flag = 1;
 150           else if (strncmp (argv[i], "-x", 2) == 0)
 151             {
 152               const char * arg;
 153               if (argv[i][2] != '\0')
 154                 arg = argv[i]+2;
 155               else if ((argv[i+1]) != NULL)
 156                 /* We need to swallow arg on next loop.  */
 157                 quote = arg = argv[i+1];
 158               else  /* Error condition, message will be printed later.  */
 159                 arg = "";
 160               if (library == 0
 161                   && (strcmp (arg, "c++") == 0
 162                       || strcmp (arg, "c++-cpp-output") == 0
 163                       || strcmp (arg, "objective-c++") == 0
 164                       || strcmp (arg, "objective-c++-cpp-output") == 0))
 165                 library = 1;
 166
 167               saw_speclang = 1;
 168             }
 169           else if (strcmp (argv[i], "-ObjC++") == 0)
 170             {
 171               if (library == 0)
 172                 library = 1;
 173               saw_speclang = 1;
 174             }
 175           /* Arguments that go directly to the linker might be .o files,
 176              or something, and so might cause libstdc++ to be needed.  */
 177           else if (strcmp (argv[i], "-Xlinker") == 0)
 178             {
 179               quote = argv[i];
 180               if (library == 0)
 181                 library = 1;
 182             }
 183           else if (strncmp (argv[i], "-Wl,", 4) == 0)
 184             library = (library == 0) ? 1 : library;
 185           /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 186           else if (strncmp (argv[i], "-l", 2) == 0)
 187             library = (library == 0) ? 1 : library;
 188           else if (((argv[i][2] == '\0'
 189                      && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 190                     || strcmp (argv[i], "-Tdata") == 0))
 191             quote = argv[i];
 192           else if ((argv[i][2] == '\0'
 193                     && strchr ("cSEM", argv[i][1]) != NULL)
 194                    || strcmp (argv[i], "-MM") == 0
 195                    || strcmp (argv[i], "-fsyntax-only") == 0)
 196             {
 197               /* Don't specify libraries if we won't link, since that would
 198                  cause a warning.  */
 199               library = -1;
 200             }
 201           else if (strcmp (argv[i], "-static-libgcc") == 0
 202                    || strcmp (argv[i], "-static") == 0)
 203             shared_libgcc = 0;
 204           else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1]))
 205             i++;
 206           else
 207             /* Pass other options through.  */
 208             continue;
 209         }
 210       else
 211         {
 212           int len;
 213
 214           if (saw_speclang)
 215             {
 216               saw_speclang = 0;
 217               continue;
 218             }
 219
 220           /* If the filename ends in .[chi], put options around it.
 221              But not if a specified -x option is currently active.  */
 222           len = strlen (argv[i]);
 223           if (len > 2
 224               && (argv[i][len - 1] == 'c'
 225                   || argv[i][len - 1] == 'i'
 226                   || argv[i][len - 1] == 'h')
 227               && argv[i][len - 2] == '.')
 228             {
 229               args[i] |= LANGSPEC;
 230               added += 2;
 231             }
 232
 233           /* If we don't know that this is a header file, we might
 234              need to be linking in the libraries.  */
 235           if (library == 0)
 236             {
 237               if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
 238                   && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
 239                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
 240                 library = 1;
 241             }
 242         }
 243     }
 244
 245   if (quote)
 246     fatal ("argument to '%s' missing\n", quote);
 247
 248   /* There's no point adding -shared-libgcc if we don't have a shared
 249      libgcc.  */
 250 #ifndef ENABLE_SHARED_LIBGCC
 251   shared_libgcc = 0;
 252 #endif
 253
 254   /* Make sure to have room for the trailing NULL argument.  */
 255   num_args = argc + added + need_math + shared_libgcc + (library > 0) + 1;
 256   arglist = XNEWVEC (const char *, num_args);
 257
 258   i = 0;
 259   j = 0;
 260
 261   /* Copy the 0th argument, i.e., the name of the program itself.  */
 262   arglist[i++] = argv[j++];
 263
 264   /* NOTE: We start at 1 now, not 0.  */
 265   while (i < argc)
 266     {
 267       arglist[j] = argv[i];
 268
 269       /* Make sure -lstdc++ is before the math library, since libstdc++
 270          itself uses those math routines.  */
 271       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 272         {
 273           --j;
 274           saw_math = argv[i];
 275         }
 276
 277       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 278         {
 279           --j;
 280           saw_libc = argv[i];
 281         }
 282
 283       /* Wrap foo.[chi] files in a language specification to
 284          force the gcc compiler driver to run cc1plus on them.  */
 285       if (args[i] & LANGSPEC)
 286         {
 287           int len = strlen (argv[i]);
 288           switch (argv[i][len - 1])
 289             {
 290             case 'c':
 291               arglist[j++] = "-xc++";
 292               break;
 293             case 'i':
 294               arglist[j++] = "-xc++-cpp-output";
 295               break;
 296             case 'h':
 297               arglist[j++] = "-xc++-header";
 298               break;
 299             default:
 300               gcc_unreachable ();
 301             }
 302           arglist[j++] = argv[i];
 303           arglist[j] = "-xnone";
 304         }
 305
 306       i++;
 307       j++;
 308     }
 309
 310   /* Add `-lstdc++' if we haven't already done so.  */
 311   if (library > 0)
 312     {
 313       arglist[j] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 314       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 315         added_libraries++;
 316       j++;
 317     }
 318   if (saw_math)
 319     arglist[j++] = saw_math;
 320   else if (library > 0 && need_math)
 321     {
 322       arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 323       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 324         added_libraries++;
 325       j++;
 326     }
 327   if (saw_libc)
 328     arglist[j++] = saw_libc;
 329   if (shared_libgcc)
 330     arglist[j++] = "-shared-libgcc";
 331
 332   arglist[j] = NULL;
 333
 334   *in_argc = j;
 335   *in_argv = arglist;
 336   *in_added_libraries = added_libraries;
 337 }
 338
 339 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 340 int lang_specific_pre_link (void)  /* Not used for C++.  */
 341 {
 342   return 0;
 343 }
 344
 345 /* Number of extra output files that lang_specific_pre_link may generate.  */
 346 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */