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      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   /* The total number of arguments with the new stuff.  */
  86   int argc;
  87
  88   /* The argument list.  */
  89   const char *const *argv;
  90
  91   /* The number of libraries added in.  */
  92   int added_libraries;
  93
  94   /* The total number of arguments with the new stuff.  */
  95   int num_args = 1;
  96
  97   argc = *in_argc;
  98   argv = *in_argv;
  99   added_libraries = *in_added_libraries;
 100
 101   args = (int *) xcalloc (argc, sizeof (int));
 102
 103   for (i = 1; i < argc; i++)
 104     {
 105       /* If the previous option took an argument, we swallow it here.  */
 106       if (quote)
 107         {
 108           quote = NULL;
 109           continue;
 110         }
 111
 112       /* We don't do this anymore, since we don't get them with minus
 113          signs on them.  */
 114       if (argv[i][0] == '\0' || argv[i][1] == '\0')
 115         continue;
 116
 117       if (argv[i][0] == '-')
 118         {
 119           if (library != 0 && (strcmp (argv[i], "-nostdlib") == 0
 120                                || strcmp (argv[i], "-nodefaultlibs") == 0))
 121             {
 122               library = 0;
 123             }
 124           else if (strcmp (argv[i], "-lm") == 0
 125                    || strcmp (argv[i], "-lmath") == 0
 126                    || strcmp (argv[i], MATH_LIBRARY) == 0
 127 #ifdef ALT_LIBM
 128                    || strcmp (argv[i], ALT_LIBM) == 0
 129 #endif
 130                   )
 131             {
 132               args[i] |= MATHLIB;
 133               need_math = 0;
 134             }
 135           else if (strcmp (argv[i], "-lc") == 0)
 136             args[i] |= WITHLIBC;
 137           else if (strcmp (argv[i], "-v") == 0)
 138             {
 139               saw_verbose_flag = 1;
 140               if (argc == 2)
 141                 {
 142                   /* If they only gave us `-v', don't try to link
 143                      in libg++.  */
 144                   library = 0;
 145                 }
 146             }
 147           else if (strncmp (argv[i], "-x", 2) == 0)
 148             saw_speclang = 1;
 149           else if (((argv[i][2] == '\0'
 150                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 151                     || strcmp (argv[i], "-Tdata") == 0))
 152             quote = argv[i];
 153           else if (library != 0 && ((argv[i][2] == '\0'
 154                      && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 155                     || strcmp (argv[i], "-MM") == 0
 156                     || strcmp (argv[i], "-fsyntax-only") == 0))
 157             {
 158               /* Don't specify libraries if we won't link, since that would
 159                  cause a warning.  */
 160               library = 0;
 161               added -= 2;
 162             }
 163           else
 164             /* Pass other options through.  */
 165             continue;
 166         }
 167       else
 168         {
 169           int len;
 170
 171           if (saw_speclang)
 172             {
 173               saw_speclang = 0;
 174               continue;
 175             }
 176
 177           /* If the filename ends in .c or .i, put options around it.
 178              But not if a specified -x option is currently active.  */
 179           len = strlen (argv[i]);
 180           if (len > 2
 181               && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
 182               && argv[i][len - 2] == '.')
 183             {
 184               args[i] |= LANGSPEC;
 185               added += 2;
 186             }
 187         }
 188     }
 189
 190   if (quote)
 191     fatal ("argument to `%s' missing\n", quote);
 192
 193   /* If we know we don't have to do anything, bail now.  */
 194   if (! added && ! library)
 195     {
 196       free (args);
 197       return;
 198     }
 199
 200   /* Make sure to have room for the trailing NULL argument.  */
 201   num_args = argc + added + need_math + 1;
 202   arglist = (const char **) xmalloc (num_args * sizeof (char *));
 203
 204   i = 0;
 205   j = 0;
 206
 207   /* Copy the 0th argument, i.e., the name of the program itself.  */
 208   arglist[i++] = argv[j++];
 209
 210   /* NOTE: We start at 1 now, not 0.  */
 211   while (i < argc)
 212     {
 213       arglist[j] = argv[i];
 214
 215       /* Make sure -lstdc++ is before the math library, since libstdc++
 216          itself uses those math routines.  */
 217       if (!saw_math && (args[i] & MATHLIB) && library)
 218         {
 219           --j;
 220           saw_math = argv[i];
 221         }
 222
 223       if (!saw_libc && (args[i] & WITHLIBC) && library)
 224         {
 225           --j;
 226           saw_libc = argv[i];
 227         }
 228
 229       /* Wrap foo.c and foo.i files in a language specification to
 230          force the gcc compiler driver to run cc1plus on them.  */
 231       if (args[i] & LANGSPEC)
 232         {
 233           int len = strlen (argv[i]);
 234           if (argv[i][len - 1] == 'i')
 235             arglist[j++] = "-xc++-cpp-output";
 236           else
 237             arglist[j++] = "-xc++";
 238           arglist[j++] = argv[i];
 239           arglist[j] = "-xnone";
 240         }
 241
 242       i++;
 243       j++;
 244     }
 245
 246   /* Add `-lstdc++' if we haven't already done so.  */
 247   if (library)
 248     {
 249       arglist[j++] = LIBSTDCXX;
 250       added_libraries++;
 251     }
 252   if (saw_math)
 253     arglist[j++] = saw_math;
 254   else if (library && need_math)
 255     {
 256       arglist[j++] = MATH_LIBRARY;
 257       added_libraries++;
 258     }
 259   if (saw_libc)
 260     arglist[j++] = saw_libc;
 261
 262   arglist[j] = NULL;
 263
 264   *in_argc = j;
 265   *in_argv = arglist;
 266   *in_added_libraries = added_libraries;
 267 }
 268
 269 /* Called before linking.  Returns 0 on success and -1 on failure. */
 270 int lang_specific_pre_link ()  /* Not used for C++. */
 271 {
 272   return 0;
 273 }
 274
 275 /* Number of extra output files that lang_specific_pre_link may generate. */
 276 int lang_specific_extra_outfiles = 0;  /* Not used for C++. */