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
  36 #ifndef LIBSTDCXX
  37 #define LIBSTDCXX "-lstdc++"
  38 #endif
  39
  40 void
  41 lang_specific_driver (in_argc, in_argv, in_added_libraries)
  42      int *in_argc;
  43      const char *const **in_argv;
  44      int *in_added_libraries;
  45 {
  46   int i, j;
  47
  48   /* If non-zero, the user gave us the `-v' flag.  */
  49   int saw_verbose_flag = 0;
  50
  51   /* This will be 0 if we encounter a situation where we should not
  52      link in libstdc++.  */
  53   int library = 1;
  54
  55   /* The number of arguments being added to what's in argv, other than
  56      libraries.  We use this to track the number of times we've inserted
  57      -xc++/-xnone.  */
  58   int added = 2;
  59
  60   /* Used to track options that take arguments, so we don't go wrapping
  61      those with -xc++/-xnone.  */
  62   const char *quote = NULL;
  63
  64   /* The new argument list will be contained in this.  */
  65   const char **arglist;
  66
  67   /* Non-zero if we saw a `-xfoo' language specification on the
  68      command line.  Used to avoid adding our own -xc++ if the user
  69      already gave a language for the file.  */
  70   int saw_speclang = 0;
  71
  72   /* "-lm" or "-lmath" if it appears on the command line.  */
  73   const char *saw_math = 0;
  74
  75   /* "-lc" if it appears on the command line.  */
  76   const char *saw_libc = 0;
  77
  78   /* An array used to flag each argument that needs a bit set for
  79      LANGSPEC, MATHLIB, or WITHLIBC.  */
  80   int *args;
  81
  82   /* By default, we throw on the math library if we have one.  */
  83   int need_math = (MATH_LIBRARY[0] != '\0');
  84
  85   /* True if we should add -shared-libgcc to the command-line.  */
  86   int shared_libgcc = 1;
  87
  88   /* The total number of arguments with the new stuff.  */
  89   int argc;
  90
  91   /* The argument list.  */
  92   const char *const *argv;
  93
  94   /* The number of libraries added in.  */
  95   int added_libraries;
  96
  97   /* The total number of arguments with the new stuff.  */
  98   int num_args = 1;
  99
 100   argc = *in_argc;
 101   argv = *in_argv;
 102   added_libraries = *in_added_libraries;
 103
 104   args = (int *) xcalloc (argc, sizeof (int));
 105
 106   for (i = 1; i < argc; i++)
 107     {
 108       /* If the previous option took an argument, we swallow it here.  */
 109       if (quote)
 110         {
 111           quote = NULL;
 112           continue;
 113         }
 114
 115       /* We don't do this anymore, since we don't get them with minus
 116          signs on them.  */
 117       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 118         continue;
 119
 120       if (argv[i][0] == '-')
 121         {
 122           if (library != 0 && (strcmp (argv[i], "-nostdlib") == 0
 123                                || strcmp (argv[i], "-nodefaultlibs") == 0))
 124             {
 125               library = 0;
 126             }
 127           else if (strcmp (argv[i], "-lm") == 0
 128                    || strcmp (argv[i], "-lmath") == 0
 129                    || strcmp (argv[i], MATH_LIBRARY) == 0
 130 #ifdef ALT_LIBM
 131                    || strcmp (argv[i], ALT_LIBM) == 0
 132 #endif
 133                   )
 134             {
 135               args[i] |= MATHLIB;
 136               need_math = 0;
 137             }
 138           else if (strcmp (argv[i], "-lc") == 0)
 139             args[i] |= WITHLIBC;
 140           else if (strcmp (argv[i], "-v") == 0)
 141             {
 142               saw_verbose_flag = 1;
 143               if (argc == 2)
 144                 {
 145                   /* If they only gave us `-v', don't try to link
 146                      in libg++.  */
 147                   library = 0;
 148                 }
 149             }
 150           else if (strncmp (argv[i], "-x", 2) == 0)
 151             saw_speclang = 1;
 152           else if (((argv[i][2] == '\0'
 153                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 154                     || strcmp (argv[i], "-Xlinker") == 0
 155                     || strcmp (argv[i], "-Tdata") == 0))
 156             quote = argv[i];
 157           else if (library != 0 && ((argv[i][2] == '\0'
 158                      && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 159                     || strcmp (argv[i], "-MM") == 0
 160                     || strcmp (argv[i], "-fsyntax-only") == 0))
 161             {
 162               /* Don't specify libraries if we won't link, since that would
 163                  cause a warning.  */
 164               library = 0;
 165               added -= 2;
 166             }
 167           else if (strcmp (argv[i], "-static-libgcc") == 0
 168                    || strcmp (argv[i], "-static") == 0)
 169             shared_libgcc = 0;
 170           else
 171             /* Pass other options through.  */
 172             continue;
 173         }
 174       else
 175         {
 176           int len;
 177
 178           if (saw_speclang)
 179             {
 180               saw_speclang = 0;
 181               continue;
 182             }
 183
 184           /* If the filename ends in .c or .i, put options around it.
 185              But not if a specified -x option is currently active.  */
 186           len = strlen (argv[i]);
 187           if (len > 2
 188               && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
 189               && argv[i][len - 2] == '.')
 190             {
 191               args[i] |= LANGSPEC;
 192               added += 2;
 193             }
 194         }
 195     }
 196
 197   if (quote)
 198     fatal ("argument to `%s' missing\n", quote);
 199
 200   /* If we know we don't have to do anything, bail now.  */
 201   if (! added && ! library)
 202     {
 203       free (args);
 204       return;
 205     }
 206
 207   /* There's no point adding -shared-libgcc if we don't have a shared
 208      libgcc.  */
 209 #ifndef ENABLE_SHARED_LIBGCC
 210   shared_libgcc = 0;
 211 #endif
 212
 213   /* Make sure to have room for the trailing NULL argument.  */
 214   num_args = argc + added + need_math + shared_libgcc + 1;
 215   arglist = (const char **) xmalloc (num_args * sizeof (char *));
 216
 217   i = 0;
 218   j = 0;
 219
 220   /* Copy the 0th argument, i.e., the name of the program itself.  */
 221   arglist[i++] = argv[j++];
 222
 223   /* NOTE: We start at 1 now, not 0.  */
 224   while (i < argc)
 225     {
 226       arglist[j] = argv[i];
 227
 228       /* Make sure -lstdc++ is before the math library, since libstdc++
 229          itself uses those math routines.  */
 230       if (!saw_math && (args[i] & MATHLIB) && library)
 231         {
 232           --j;
 233           saw_math = argv[i];
 234         }
 235
 236       if (!saw_libc && (args[i] & WITHLIBC) && library)
 237         {
 238           --j;
 239           saw_libc = argv[i];
 240         }
 241
 242       /* Wrap foo.c and foo.i files in a language specification to
 243          force the gcc compiler driver to run cc1plus on them.  */
 244       if (args[i] & LANGSPEC)
 245         {
 246           int len = strlen (argv[i]);
 247           if (argv[i][len - 1] == 'i')
 248             arglist[j++] = "-xc++-cpp-output";
 249           else
 250             arglist[j++] = "-xc++";
 251           arglist[j++] = argv[i];
 252           arglist[j] = "-xnone";
 253         }
 254
 255       i++;
 256       j++;
 257     }
 258
 259   /* Add `-lstdc++' if we haven't already done so.  */
 260   if (library)
 261     {
 262       arglist[j++] = LIBSTDCXX;
 263       added_libraries++;
 264     }
 265   if (saw_math)
 266     arglist[j++] = saw_math;
 267   else if (library && need_math)
 268     {
 269       arglist[j++] = MATH_LIBRARY;
 270       added_libraries++;
 271     }
 272   if (saw_libc)
 273     arglist[j++] = saw_libc;
 274   if (shared_libgcc)
 275     arglist[j++] = "-shared-libgcc";
 276
 277   arglist[j] = NULL;
 278
 279   *in_argc = j;
 280   *in_argv = arglist;
 281   *in_added_libraries = added_libraries;
 282 }
 283
 284 /* Called before linking.  Returns 0 on success and -1 on failure. */
 285 int lang_specific_pre_link ()  /* Not used for C++. */
 286 {
 287   return 0;
 288 }
 289
 290 /* Number of extra output files that lang_specific_pre_link may generate. */
 291 int lang_specific_extra_outfiles = 0;  /* Not used for C++. */