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, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, 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 = xcalloc (argc, sizeof (int));
 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               if (library == 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                     arg = argv[i+1];
 159                   else  /* Error condition, message will be printed later.  */
 160                     arg = "";
 161                   if (strcmp (arg, "c++") == 0
 162                       || strcmp (arg, "c++-cpp-output") == 0)
 163                     library = 1;
 164                 }
 165               saw_speclang = 1;
 166             }
 167           /* Arguments that go directly to the linker might be .o files,
 168              or something, and so might cause libstdc++ to be needed.  */
 169           else if (strcmp (argv[i], "-Xlinker") == 0)
 170             {
 171               quote = argv[i];
 172               if (library == 0)
 173                 library = 1;
 174             }
 175           else if (strncmp (argv[i], "-Wl,", 4) == 0)
 176             library = (library == 0) ? 1 : library;
 177           /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 178           else if (strncmp (argv[i], "-l", 2) == 0)
 179             library = (library == 0) ? 1 : library;
 180           else if (((argv[i][2] == '\0'
 181                      && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 182                     || strcmp (argv[i], "-Tdata") == 0))
 183             quote = argv[i];
 184           else if ((argv[i][2] == '\0'
 185                     && strchr ("cSEM", argv[i][1]) != NULL)
 186                    || strcmp (argv[i], "-MM") == 0
 187                    || strcmp (argv[i], "-fsyntax-only") == 0)
 188             {
 189               /* Don't specify libraries if we won't link, since that would
 190                  cause a warning.  */
 191               library = -1;
 192             }
 193           else if (strcmp (argv[i], "-static-libgcc") == 0
 194                    || strcmp (argv[i], "-static") == 0)
 195             shared_libgcc = 0;
 196           else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1]))
 197             i++;
 198           else
 199             /* Pass other options through.  */
 200             continue;
 201         }
 202       else
 203         {
 204           int len;
 205
 206           if (saw_speclang)
 207             {
 208               saw_speclang = 0;
 209               continue;
 210             }
 211
 212           /* If the filename ends in .[chi], put options around it.
 213              But not if a specified -x option is currently active.  */
 214           len = strlen (argv[i]);
 215           if (len > 2
 216               && (argv[i][len - 1] == 'c'
 217                   || argv[i][len - 1] == 'i'
 218                   || argv[i][len - 1] == 'h')
 219               && argv[i][len - 2] == '.')
 220             {
 221               args[i] |= LANGSPEC;
 222               added += 2;
 223             }
 224
 225           /* If we don't know that this is a header file, we might
 226              need to be linking in the libraries.  */
 227           if (library == 0)
 228             {
 229               if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
 230                   && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
 231                   && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
 232                 library = 1;
 233             }
 234         }
 235     }
 236
 237   if (quote)
 238     fatal ("argument to '%s' missing\n", quote);
 239
 240   /* If we know we don't have to do anything, bail now.  */
 241   if (! added && library <= 0)
 242     {
 243       free (args);
 244       return;
 245     }
 246
 247   /* There's no point adding -shared-libgcc if we don't have a shared
 248      libgcc.  */
 249 #ifndef ENABLE_SHARED_LIBGCC
 250   shared_libgcc = 0;
 251 #endif
 252
 253   /* Make sure to have room for the trailing NULL argument.  */
 254   num_args = argc + added + need_math + shared_libgcc + (library > 0) + 1;
 255   arglist = xmalloc (num_args * sizeof (char *));
 256
 257   i = 0;
 258   j = 0;
 259
 260   /* Copy the 0th argument, i.e., the name of the program itself.  */
 261   arglist[i++] = argv[j++];
 262
 263   /* NOTE: We start at 1 now, not 0.  */
 264   while (i < argc)
 265     {
 266       arglist[j] = argv[i];
 267
 268       /* Make sure -lstdc++ is before the math library, since libstdc++
 269          itself uses those math routines.  */
 270       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 271         {
 272           --j;
 273           saw_math = argv[i];
 274         }
 275
 276       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 277         {
 278           --j;
 279           saw_libc = argv[i];
 280         }
 281
 282       /* Wrap foo.[chi] files in a language specification to
 283          force the gcc compiler driver to run cc1plus on them.  */
 284       if (args[i] & LANGSPEC)
 285         {
 286           int len = strlen (argv[i]);
 287           switch (argv[i][len - 1])
 288             {
 289             case 'c':
 290               arglist[j++] = "-xc++";
 291               break;
 292             case 'i':
 293               arglist[j++] = "-xc++-cpp-output";
 294               break;
 295             case 'h':
 296               arglist[j++] = "-xc++-header";
 297               break;
 298             default:
 299               gcc_unreachable ();
 300             }
 301           arglist[j++] = argv[i];
 302           arglist[j] = "-xnone";
 303         }
 304
 305       i++;
 306       j++;
 307     }
 308
 309   /* Add `-lstdc++' if we haven't already done so.  */
 310   if (library > 0)
 311     {
 312       arglist[j] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 313       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 314         added_libraries++;
 315       j++;
 316     }
 317   if (saw_math)
 318     arglist[j++] = saw_math;
 319   else if (library > 0 && need_math)
 320     {
 321       arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 322       if (arglist[j][0] != '-' || arglist[j][1] == 'l')
 323         added_libraries++;
 324       j++;
 325     }
 326   if (saw_libc)
 327     arglist[j++] = saw_libc;
 328   if (shared_libgcc)
 329     arglist[j++] = "-shared-libgcc";
 330
 331   arglist[j] = NULL;
 332
 333   *in_argc = j;
 334   *in_argv = arglist;
 335   *in_added_libraries = added_libraries;
 336 }
 337
 338 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 339 int lang_specific_pre_link (void)  /* Not used for C++.  */
 340 {
 341   return 0;
 342 }
 343
 344 /* Number of extra output files that lang_specific_pre_link may generate.  */
 345 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */
 346
 347 /* Table of language-specific spec functions.  */
 348 const struct spec_function lang_specific_spec_functions[] =
 349 {
 350   { 0, 0 }
 351 };