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 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "gcc.h"
  24
  25 /* This bit is set if we saw a `-xfoo' language specification.  */
  26 #define LANGSPEC        (1<<1)
  27 /* This bit is set if they did `-lm' or `-lmath'.  */
  28 #define MATHLIB         (1<<2)
  29 /* This bit is set if they did `-lc'.  */
  30 #define WITHLIBC        (1<<3)
  31
  32 #ifndef MATH_LIBRARY
  33 #define MATH_LIBRARY "-lm"
  34 #endif
  35 #ifndef MATH_LIBRARY_PROFILE
  36 #define MATH_LIBRARY_PROFILE "-lm"
  37 #endif
  38
  39 #ifndef LIBSTDCXX
  40 #define LIBSTDCXX "-lstdc++"
  41 #endif
  42 #ifndef LIBSTDCXX_PROFILE
  43 #define LIBSTDCXX_PROFILE "-lstdc++"
  44 #endif
  45
  46 #ifndef LIBUNWIND
  47 #define LIBUNWIND "-lunwind"
  48 #endif
  49
  50 void
  51 lang_specific_driver (in_argc, in_argv, in_added_libraries)
  52      int *in_argc;
  53      const char *const **in_argv;
  54      int *in_added_libraries;
  55 {
  56   int i, j;
  57
  58   /* If non-zero, the user gave us the `-p' or `-pg' flag.  */
  59   int saw_profile_flag = 0;
  60
  61   /* If non-zero, the user gave us the `-v' flag.  */
  62   int saw_verbose_flag = 0;
  63
  64   /* This will be 0 if we encounter a situation where we should not
  65      link in libstdc++.  */
  66   int library = 1;
  67
  68   /* The number of arguments being added to what's in argv, other than
  69      libraries.  We use this to track the number of times we've inserted
  70      -xc++/-xnone.  */
  71   int added = 2;
  72
  73   /* Used to track options that take arguments, so we don't go wrapping
  74      those with -xc++/-xnone.  */
  75   const char *quote = NULL;
  76
  77   /* The new argument list will be contained in this.  */
  78   const char **arglist;
  79
  80   /* Non-zero if we saw a `-xfoo' language specification on the
  81      command line.  Used to avoid adding our own -xc++ if the user
  82      already gave a language for the file.  */
  83   int saw_speclang = 0;
  84
  85   /* "-lm" or "-lmath" if it appears on the command line.  */
  86   const char *saw_math = 0;
  87
  88   /* "-lc" if it appears on the command line.  */
  89   const char *saw_libc = 0;
  90
  91   /* An array used to flag each argument that needs a bit set for
  92      LANGSPEC, MATHLIB, or WITHLIBC.  */
  93   int *args;
  94
  95   /* By default, we throw on the math library if we have one.  */
  96   int need_math = (MATH_LIBRARY[0] != '\0');
  97
  98   /* True if we should add -shared-libgcc to the command-line.  */
  99   int shared_libgcc = 1;
 100
 101   /* The total number of arguments with the new stuff.  */
 102   int argc;
 103
 104   /* The argument list.  */
 105   const char *const *argv;
 106
 107   /* The number of libraries added in.  */
 108   int added_libraries;
 109
 110   /* The total number of arguments with the new stuff.  */
 111   int num_args = 1;
 112
 113   argc = *in_argc;
 114   argv = *in_argv;
 115   added_libraries = *in_added_libraries;
 116
 117   args = (int *) xcalloc (argc, sizeof (int));
 118
 119   for (i = 1; i < argc; i++)
 120     {
 121       /* If the previous option took an argument, we swallow it here.  */
 122       if (quote)
 123         {
 124           quote = NULL;
 125           continue;
 126         }
 127
 128       /* We don't do this anymore, since we don't get them with minus
 129          signs on them.  */
 130       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 131         continue;
 132
 133       if (argv[i][0] == '-')
 134         {
 135           if (library != 0 && (strcmp (argv[i], "-nostdlib") == 0
 136                                || strcmp (argv[i], "-nodefaultlibs") == 0))
 137             {
 138               library = 0;
 139             }
 140           else if (strcmp (argv[i], "-lm") == 0
 141                    || strcmp (argv[i], "-lmath") == 0
 142                    || strcmp (argv[i], MATH_LIBRARY) == 0
 143 #ifdef ALT_LIBM
 144                    || strcmp (argv[i], ALT_LIBM) == 0
 145 #endif
 146                   )
 147             {
 148               args[i] |= MATHLIB;
 149               need_math = 0;
 150             }
 151           else if (strcmp (argv[i], "-lc") == 0)
 152             args[i] |= WITHLIBC;
 153           else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0)
 154             saw_profile_flag++;
 155           else if (strcmp (argv[i], "-v") == 0)
 156             {
 157               saw_verbose_flag = 1;
 158               if (argc == 2)
 159                 {
 160                   /* If they only gave us `-v', don't try to link
 161                      in libg++.  */
 162                   library = 0;
 163                 }
 164             }
 165           else if (strncmp (argv[i], "-x", 2) == 0)
 166             saw_speclang = 1;
 167           else if (((argv[i][2] == '\0'
 168                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 169                     || strcmp (argv[i], "-Xlinker") == 0
 170                     || strcmp (argv[i], "-Tdata") == 0))
 171             quote = argv[i];
 172           else if (library != 0 && ((argv[i][2] == '\0'
 173                      && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 174                     || strcmp (argv[i], "-MM") == 0
 175                     || strcmp (argv[i], "-fsyntax-only") == 0))
 176             {
 177               /* Don't specify libraries if we won't link, since that would
 178                  cause a warning.  */
 179               library = 0;
 180               added -= 2;
 181             }
 182           else if (strcmp (argv[i], "-static-libgcc") == 0
 183                    || strcmp (argv[i], "-static") == 0)
 184             shared_libgcc = 0;
 185           else
 186             /* Pass other options through.  */
 187             continue;
 188         }
 189       else
 190         {
 191           int len;
 192
 193           if (saw_speclang)
 194             {
 195               saw_speclang = 0;
 196               continue;
 197             }
 198
 199           /* If the filename ends in .c or .i, put options around it.
 200              But not if a specified -x option is currently active.  */
 201           len = strlen (argv[i]);
 202           if (len > 2
 203               && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
 204               && argv[i][len - 2] == '.')
 205             {
 206               args[i] |= LANGSPEC;
 207               added += 2;
 208             }
 209         }
 210     }
 211
 212   if (quote)
 213     fatal ("argument to `%s' missing\n", quote);
 214
 215   /* If we know we don't have to do anything, bail now.  */
 216   if (! added && ! library)
 217     {
 218       free (args);
 219       return;
 220     }
 221
 222   /* There's no point adding -shared-libgcc if we don't have a shared
 223      libgcc.  */
 224 #ifndef ENABLE_SHARED_LIBGCC
 225   shared_libgcc = 0;
 226 #endif
 227
 228   /* Make sure to have room for the trailing NULL argument.  */
 229   num_args = argc + added + need_math + shared_libgcc + 1;
 230   arglist = (const char **) xmalloc (num_args * sizeof (char *));
 231
 232   i = 0;
 233   j = 0;
 234
 235   /* Copy the 0th argument, i.e., the name of the program itself.  */
 236   arglist[i++] = argv[j++];
 237
 238   /* NOTE: We start at 1 now, not 0.  */
 239   while (i < argc)
 240     {
 241       arglist[j] = argv[i];
 242
 243       /* Make sure -lstdc++ is before the math library, since libstdc++
 244          itself uses those math routines.  */
 245       if (!saw_math && (args[i] & MATHLIB) && library)
 246         {
 247           --j;
 248           saw_math = argv[i];
 249         }
 250
 251       if (!saw_libc && (args[i] & WITHLIBC) && library)
 252         {
 253           --j;
 254           saw_libc = argv[i];
 255         }
 256
 257       /* Wrap foo.c and foo.i files in a language specification to
 258          force the gcc compiler driver to run cc1plus on them.  */
 259       if (args[i] & LANGSPEC)
 260         {
 261           int len = strlen (argv[i]);
 262           if (argv[i][len - 1] == 'i')
 263             arglist[j++] = "-xc++-cpp-output";
 264           else
 265             arglist[j++] = "-xc++";
 266           arglist[j++] = argv[i];
 267           arglist[j] = "-xnone";
 268         }
 269
 270       i++;
 271       j++;
 272     }
 273
 274   /* Add `-lstdc++' if we haven't already done so.  */
 275   if (library)
 276     {
 277       arglist[j++] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
 278       added_libraries++;
 279 #ifdef USE_LIBUNWIND_EXCEPTIONS
 280       arglist[j++] = LIBUNWIND;
 281       added_libraries++;
 282 #endif
 283     }
 284   if (saw_math)
 285     arglist[j++] = saw_math;
 286   else if (library && need_math)
 287     {
 288       arglist[j++] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
 289       added_libraries++;
 290     }
 291   if (saw_libc)
 292     arglist[j++] = saw_libc;
 293   if (shared_libgcc)
 294     arglist[j++] = "-shared-libgcc";
 295
 296   arglist[j] = NULL;
 297
 298   *in_argc = j;
 299   *in_argv = arglist;
 300   *in_added_libraries = added_libraries;
 301 }
 302
 303 /* Called before linking.  Returns 0 on success and -1 on failure. */
 304 int lang_specific_pre_link ()  /* Not used for C++. */
 305 {
 306   return 0;
 307 }
 308
 309 /* Number of extra output files that lang_specific_pre_link may generate. */
 310 int lang_specific_extra_outfiles = 0;  /* Not used for C++. */