gcc/cp/g++spec.c

   1 /* Specific flags and argument handling of the C++ front-end.
   2    Copyright (C) 1996, 1997, 1998, 1999, 2000 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      char ***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   char **real_arglist;
  66   const char **arglist;
  67
  68   /* Non-zero if we saw a `-xfoo' language specification on the
  69      command line.  Used to avoid adding our own -xc++ if the user
  70      already gave a language for the file.  */
  71   int saw_speclang = 0;
  72
  73   /* "-lm" or "-lmath" if it appears on the command line.  */
  74   const char *saw_math = 0;
  75
  76   /* "-lc" if it appears on the command line.  */
  77   const char *saw_libc = 0;
  78
  79   /* An array used to flag each argument that needs a bit set for
  80      LANGSPEC, MATHLIB, or WITHLIBC.  */
  81   int *args;
  82
  83   /* By default, we throw on the math library if we have one.  */
  84   int need_math = (MATH_LIBRARY[0] != '\0');
  85
  86   /* The total number of arguments with the new stuff.  */
  87   int argc;
  88
  89   /* The argument list.  */
  90   char **argv;
  91
  92   /* The number of libraries added in.  */
  93   int added_libraries;
  94
  95   /* The total number of arguments with the new stuff.  */
  96   int num_args = 1;
  97
  98 #if ENABLE_NEW_GXX_ABI
  99   added++;
 100 #endif
 101
 102   argc = *in_argc;
 103   argv = *in_argv;
 104   added_libraries = *in_added_libraries;
 105
 106   args = (int *) xcalloc (argc, sizeof (int));
 107
 108   for (i = 1; i < argc; i++)
 109     {
 110       /* If the previous option took an argument, we swallow it here.  */
 111       if (quote)
 112         {
 113           quote = NULL;
 114           continue;
 115         }
 116
 117       /* We don't do this anymore, since we don't get them with minus
 118          signs on them.  */
 119       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 120         continue;
 121
 122       if (argv[i][0] == '-')
 123         {
 124           if (library != 0 && (strcmp (argv[i], "-nostdlib") == 0
 125                                || strcmp (argv[i], "-nodefaultlibs") == 0))
 126             {
 127               library = 0;
 128             }
 129           else if (strcmp (argv[i], "-lm") == 0
 130                    || strcmp (argv[i], "-lmath") == 0
 131                    || strcmp (argv[i], MATH_LIBRARY) == 0
 132 #ifdef ALT_LIBM
 133                    || strcmp (argv[i], ALT_LIBM) == 0
 134 #endif
 135                   )
 136             {
 137               args[i] |= MATHLIB;
 138               need_math = 0;
 139             }
 140           else if (strcmp (argv[i], "-lc") == 0)
 141             args[i] |= WITHLIBC;
 142           else if (strcmp (argv[i], "-v") == 0)
 143             {
 144               saw_verbose_flag = 1;
 145               if (argc == 2)
 146                 {
 147                   /* If they only gave us `-v', don't try to link
 148                      in libg++.  */
 149                   library = 0;
 150                 }
 151             }
 152           else if (strncmp (argv[i], "-x", 2) == 0)
 153             saw_speclang = 1;
 154           else if (((argv[i][2] == '\0'
 155                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 156                     || strcmp (argv[i], "-Tdata") == 0))
 157             quote = argv[i];
 158           else if (library != 0 && ((argv[i][2] == '\0'
 159                      && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 160                     || strcmp (argv[i], "-MM") == 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
 168             /* Pass other options through.  */
 169             continue;
 170         }
 171       else
 172         {
 173           int len;
 174
 175           if (saw_speclang)
 176             {
 177               saw_speclang = 0;
 178               continue;
 179             }
 180
 181           /* If the filename ends in .c or .i, put options around it.
 182              But not if a specified -x option is currently active.  */
 183           len = strlen (argv[i]);
 184           if (len > 2
 185               && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
 186               && argv[i][len - 2] == '.')
 187             {
 188               args[i] |= LANGSPEC;
 189               added += 2;
 190             }
 191         }
 192     }
 193
 194   if (quote)
 195     fatal ("argument to `%s' missing\n", quote);
 196
 197   /* If we know we don't have to do anything, bail now.  */
 198   if (! added && ! library)
 199     {
 200       free (args);
 201       return;
 202     }
 203
 204   /* Make sure to have room for the trailing NULL argument.  */
 205   num_args = argc + added + need_math + 1;
 206   real_arglist = (char **) xmalloc (num_args * sizeof (char *));
 207   arglist = (const char **) real_arglist;
 208
 209   i = 0;
 210   j = 0;
 211
 212   /* Copy the 0th argument, i.e., the name of the program itself.  */
 213   arglist[i++] = arglist[j++];
 214
 215 #if ENABLE_NEW_GXX_ABI
 216   /* If we should use the new ABI by default, add the appropriate flag
 217      to cc1plus here.  We put this first so that it can be overridden
 218      by other command-line options.  */
 219   arglist[j++] = "-fnew-abi";
 220 #endif
 221
 222   /* NOTE: We start at 1 now, not 0.  */
 223   while (i < argc)
 224     {
 225       arglist[j] = argv[i];
 226
 227       /* Make sure -lstdc++ is before the math library, since libstdc++
 228          itself uses those math routines.  */
 229       if (!saw_math && (args[i] & MATHLIB) && library)
 230         {
 231           --j;
 232           saw_math = argv[i];
 233         }
 234
 235       if (!saw_libc && (args[i] & WITHLIBC) && library)
 236         {
 237           --j;
 238           saw_libc = argv[i];
 239         }
 240
 241       /* Wrap foo.c and foo.i files in a language specification to
 242          force the gcc compiler driver to run cc1plus on them.  */
 243       if (args[i] & LANGSPEC)
 244         {
 245           int len = strlen (argv[i]);
 246           if (argv[i][len - 1] == 'i')
 247             arglist[j++] = "-xc++-cpp-output";
 248           else
 249             arglist[j++] = "-xc++";
 250           arglist[j++] = argv[i];
 251           arglist[j] = "-xnone";
 252         }
 253
 254       i++;
 255       j++;
 256     }
 257
 258   /* Add `-lstdc++' if we haven't already done so.  */
 259   if (library)
 260     {
 261       arglist[j++] = LIBSTDCXX;
 262       added_libraries++;
 263     }
 264   if (saw_math)
 265     arglist[j++] = saw_math;
 266   else if (library && need_math)
 267     {
 268       arglist[j++] = MATH_LIBRARY;
 269       added_libraries++;
 270     }
 271   if (saw_libc)
 272     arglist[j++] = saw_libc;
 273
 274   arglist[j] = NULL;
 275
 276   *in_argc = j;
 277   *in_argv = real_arglist;
 278   *in_added_libraries = added_libraries;
 279 }
 280
 281 /* Called before linking.  Returns 0 on success and -1 on failure. */
 282 int lang_specific_pre_link ()  /* Not used for C++. */
 283 {
 284   return 0;
 285 }
 286
 287 /* Number of extra output files that lang_specific_pre_link may generate. */
 288 int lang_specific_extra_outfiles = 0;  /* Not used for C++. */