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, 2002, 2003, 2004,
   3    2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "gcc.h"
  26 #include "opts.h"
  27
  28 /* This bit is set if we saw a `-xfoo' language specification.  */
  29 #define LANGSPEC        (1<<1)
  30 /* This bit is set if they did `-lm' or `-lmath'.  */
  31 #define MATHLIB         (1<<2)
  32 /* This bit is set if they did `-lc'.  */
  33 #define WITHLIBC        (1<<3)
  34 /* Skip this option.  */
  35 #define SKIPOPT         (1<<4)
  36
  37 #ifndef MATH_LIBRARY
  38 #define MATH_LIBRARY "m"
  39 #endif
  40 #ifndef MATH_LIBRARY_PROFILE
  41 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
  42 #endif
  43
  44 #ifndef LIBSTDCXX
  45 #define LIBSTDCXX "stdc++"
  46 #endif
  47 #ifndef LIBSTDCXX_PROFILE
  48 #define LIBSTDCXX_PROFILE LIBSTDCXX
  49 #endif
  50 #ifndef LIBSTDCXX_STATIC
  51 #define LIBSTDCXX_STATIC NULL
  52 #endif
  53
  54 void
  55 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
  56                       unsigned int *in_decoded_options_count,
  57                       int *in_added_libraries)
  58 {
  59   unsigned int i, j;
  60
  61   /* If nonzero, the user gave us the `-p' or `-pg' flag.  */
  62   int saw_profile_flag = 0;
  63
  64   /* What do with libstdc++:
  65      -1 means we should not link in libstdc++
  66      0  means we should link in libstdc++ if it is needed
  67      1  means libstdc++ is needed and should be linked in.
  68      2  means libstdc++ is needed and should be linked statically.  */
  69   int library = 0;
  70
  71   /* The number of arguments being added to what's in argv, other than
  72      libraries.  We use this to track the number of times we've inserted
  73      -xc++/-xnone.  */
  74   int added = 0;
  75
  76   /* The new argument list will be contained in this.  */
  77   struct cl_decoded_option *new_decoded_options;
  78
  79   /* Nonzero if we saw a `-xfoo' language specification on the
  80      command line.  Used to avoid adding our own -xc++ if the user
  81      already gave a language for the file.  */
  82   int saw_speclang = 0;
  83
  84   /* "-lm" or "-lmath" if it appears on the command line.  */
  85   const struct cl_decoded_option *saw_math = NULL;
  86
  87   /* "-lc" if it appears on the command line.  */
  88   const struct cl_decoded_option *saw_libc = NULL;
  89
  90   /* An array used to flag each argument that needs a bit set for
  91      LANGSPEC, MATHLIB, or WITHLIBC.  */
  92   int *args;
  93
  94   /* By default, we throw on the math library if we have one.  */
  95   int need_math = (MATH_LIBRARY[0] != '\0');
  96
  97   /* True if we saw -static.  */
  98   int static_link = 0;
  99
 100   /* True if we should add -shared-libgcc to the command-line.  */
 101   int shared_libgcc = 1;
 102
 103   /* The total number of arguments with the new stuff.  */
 104   unsigned int argc;
 105
 106   /* The argument list.  */
 107   struct cl_decoded_option *decoded_options;
 108
 109   /* The number of libraries added in.  */
 110   int added_libraries;
 111
 112   /* The total number of arguments with the new stuff.  */
 113   unsigned int num_args = 1;
 114
 115   argc = *in_decoded_options_count;
 116   decoded_options = *in_decoded_options;
 117   added_libraries = *in_added_libraries;
 118
 119   args = XCNEWVEC (int, argc);
 120
 121   for (i = 1; i < argc; i++)
 122     {
 123       const char *arg = decoded_options[i].arg;
 124       if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
 125         continue; /* Avoid examining arguments of options missing them.  */
 126
 127       switch (decoded_options[i].opt_index)
 128         {
 129         case OPT_nostdlib:
 130         case OPT_nodefaultlibs:
 131           library = -1;
 132           break;
 133
 134         case OPT_l:
 135           if (strcmp (arg, MATH_LIBRARY) == 0)
 136             {
 137               args[i] |= MATHLIB;
 138               need_math = 0;
 139             }
 140           else if (strcmp (arg, "c") == 0)
 141             args[i] |= WITHLIBC;
 142           else
 143             /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 144             library = (library == 0) ? 1 : library;
 145           break;
 146
 147         case OPT_pg:
 148         case OPT_p:
 149           saw_profile_flag++;
 150           break;
 151
 152         case OPT_x:
 153           if (library == 0
 154               && (strcmp (arg, "c++") == 0
 155                   || strcmp (arg, "c++-cpp-output") == 0
 156                   || strcmp (arg, "objective-c++") == 0
 157                   || strcmp (arg, "objective-c++-cpp-output") == 0))
 158             library = 1;
 159
 160           saw_speclang = 1;
 161           break;
 162
 163         case OPT_Xlinker:
 164         case OPT_Wl_:
 165           /* Arguments that go directly to the linker might be .o files,
 166              or something, and so might cause libstdc++ to be needed.  */
 167           if (library == 0)
 168             library = 1;
 169           break;
 170
 171         case OPT_c:
 172         case OPT_S:
 173         case OPT_E:
 174         case OPT_M:
 175         case OPT_MM:
 176         case OPT_fsyntax_only:
 177           /* Don't specify libraries if we won't link, since that would
 178              cause a warning.  */
 179           library = -1;
 180           break;
 181
 182         case OPT_static:
 183           static_link = 1;
 184           break;
 185
 186         case OPT_static_libgcc:
 187           shared_libgcc = 0;
 188           break;
 189
 190         case OPT_static_libstdc__:
 191           library = library >= 0 ? 2 : library;
 192           args[i] |= SKIPOPT;
 193           break;
 194
 195         case OPT_SPECIAL_input_file:
 196           {
 197             int len;
 198
 199             /* We don't do this anymore, since we don't get them with minus
 200                signs on them.  */
 201             if (arg[0] == '\0' || arg[1] == '\0')
 202               continue;
 203
 204             if (saw_speclang)
 205               {
 206                 saw_speclang = 0;
 207                 continue;
 208               }
 209
 210             /* If the filename ends in .[chi], put options around it.
 211                But not if a specified -x option is currently active.  */
 212             len = strlen (arg);
 213             if (len > 2
 214                 && (arg[len - 1] == 'c'
 215                     || arg[len - 1] == 'i'
 216                     || arg[len - 1] == 'h')
 217                 && arg[len - 2] == '.')
 218               {
 219                 args[i] |= LANGSPEC;
 220                 added += 2;
 221               }
 222
 223             /* If we don't know that this is a header file, we might
 224                need to be linking in the libraries.  */
 225             if (library == 0)
 226               {
 227                 if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0)
 228                     && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0)
 229                     && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0)
 230                     && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0)
 231                     && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0)
 232                     && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0)
 233                     && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0)
 234                     && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0)
 235                     && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0))
 236                   library = 1;
 237               }
 238           }
 239           break;
 240         }
 241     }
 242
 243   /* There's no point adding -shared-libgcc if we don't have a shared
 244      libgcc.  */
 245 #ifndef ENABLE_SHARED_LIBGCC
 246   shared_libgcc = 0;
 247 #endif
 248
 249   /* Add one for shared_libgcc or extra static library.  */
 250   num_args = argc + added + need_math + (library > 0) * 4 + 1;
 251   new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
 252
 253   i = 0;
 254   j = 0;
 255
 256   /* Copy the 0th argument, i.e., the name of the program itself.  */
 257   new_decoded_options[j++] = decoded_options[i++];
 258
 259   /* NOTE: We start at 1 now, not 0.  */
 260   while (i < argc)
 261     {
 262       new_decoded_options[j] = decoded_options[i];
 263
 264       /* Make sure -lstdc++ is before the math library, since libstdc++
 265          itself uses those math routines.  */
 266       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 267         {
 268           --j;
 269           saw_math = &decoded_options[i];
 270         }
 271
 272       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 273         {
 274           --j;
 275           saw_libc = &decoded_options[i];
 276         }
 277
 278       /* Wrap foo.[chi] files in a language specification to
 279          force the gcc compiler driver to run cc1plus on them.  */
 280       if (args[i] & LANGSPEC)
 281         {
 282           const char *arg = decoded_options[i].arg;
 283           int len = strlen (arg);
 284           switch (arg[len - 1])
 285             {
 286             case 'c':
 287               generate_option (OPT_x, "c++", 1, CL_DRIVER,
 288                                &new_decoded_options[j++]);
 289               break;
 290             case 'i':
 291               generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER,
 292                                &new_decoded_options[j++]);
 293               break;
 294             case 'h':
 295               generate_option (OPT_x, "c++-header", 1, CL_DRIVER,
 296                                &new_decoded_options[j++]);
 297               break;
 298             default:
 299               gcc_unreachable ();
 300             }
 301           new_decoded_options[j++] = decoded_options[i];
 302           generate_option (OPT_x, "none", 1, CL_DRIVER,
 303                            &new_decoded_options[j]);
 304         }
 305
 306       if ((args[i] & SKIPOPT) != 0)
 307         --j;
 308
 309       i++;
 310       j++;
 311     }
 312
 313   /* Add `-lstdc++' if we haven't already done so.  */
 314   if (library > 0)
 315     {
 316 #ifdef HAVE_LD_STATIC_DYNAMIC
 317       if (library > 1 && !static_link)
 318         {
 319           generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
 320                            &new_decoded_options[j]);
 321           j++;
 322         }
 323 #endif
 324       generate_option (OPT_l,
 325                        saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1,
 326                        CL_DRIVER, &new_decoded_options[j]);
 327       added_libraries++;
 328       j++;
 329       /* Add target-dependent static library, if necessary.  */
 330       if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
 331         {
 332           generate_option (OPT_l, LIBSTDCXX_STATIC, 1,
 333                            CL_DRIVER, &new_decoded_options[j]);
 334           added_libraries++;
 335           j++;
 336         }
 337 #ifdef HAVE_LD_STATIC_DYNAMIC
 338       if (library > 1 && !static_link)
 339         {
 340           generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
 341                            &new_decoded_options[j]);
 342           j++;
 343         }
 344 #endif
 345     }
 346   if (saw_math)
 347     new_decoded_options[j++] = *saw_math;
 348   else if (library > 0 && need_math)
 349     {
 350       generate_option (OPT_l,
 351                        saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
 352                        1, CL_DRIVER, &new_decoded_options[j]);
 353       added_libraries++;
 354       j++;
 355     }
 356   if (saw_libc)
 357     new_decoded_options[j++] = *saw_libc;
 358   if (shared_libgcc && !static_link)
 359     generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
 360                      &new_decoded_options[j++]);
 361
 362   *in_decoded_options_count = j;
 363   *in_decoded_options = new_decoded_options;
 364   *in_added_libraries = added_libraries;
 365 }
 366
 367 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 368 int lang_specific_pre_link (void)  /* Not used for C++.  */
 369 {
 370   return 0;
 371 }
 372
 373 /* Number of extra output files that lang_specific_pre_link may generate.  */
 374 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */