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