gcc/cp/g++spec.c

   1 /* Specific flags and argument handling of the C++ front end.
   2    Copyright (C) 1996-2017 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC 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 3, or (at your option)
   9 any later version.
  10
  11 GCC 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 GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "opts.h"
  25
  26 /* This bit is set if we saw a `-xfoo' language specification.  */
  27 #define LANGSPEC        (1<<1)
  28 /* This bit is set if they did `-lm' or `-lmath'.  */
  29 #define MATHLIB         (1<<2)
  30 /* This bit is set if they did `-lrt' or equivalent.  */
  31 #define TIMELIB         (1<<3)
  32 /* This bit is set if they did `-lc'.  */
  33 #define WITHLIBC        (1<<4)
  34 /* Skip this option.  */
  35 #define SKIPOPT         (1<<5)
  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 TIME_LIBRARY
  45 #define TIME_LIBRARY ""
  46 #endif
  47
  48 #ifndef LIBSTDCXX
  49 #define LIBSTDCXX "stdc++"
  50 #endif
  51 #ifndef LIBSTDCXX_PROFILE
  52 #define LIBSTDCXX_PROFILE LIBSTDCXX
  53 #endif
  54 #ifndef LIBSTDCXX_STATIC
  55 #define LIBSTDCXX_STATIC NULL
  56 #endif
  57
  58 void
  59 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
  60                       unsigned int *in_decoded_options_count,
  61                       int *in_added_libraries)
  62 {
  63   unsigned int i, j;
  64
  65   /* If nonzero, the user gave us the `-p' or `-pg' flag.  */
  66   int saw_profile_flag = 0;
  67
  68   /* What do with libstdc++:
  69      -1 means we should not link in libstdc++
  70      0  means we should link in libstdc++ if it is needed
  71      1  means libstdc++ is needed and should be linked in.
  72      2  means libstdc++ is needed and should be linked statically.  */
  73   int library = 0;
  74
  75   /* The number of arguments being added to what's in argv, other than
  76      libraries.  We use this to track the number of times we've inserted
  77      -xc++/-xnone.  */
  78   int added = 0;
  79
  80   /* The new argument list will be contained in this.  */
  81   struct cl_decoded_option *new_decoded_options;
  82
  83   /* Nonzero if we saw a `-xfoo' language specification on the
  84      command line.  Used to avoid adding our own -xc++ if the user
  85      already gave a language for the file.  */
  86   int saw_speclang = 0;
  87
  88   /* "-lm" or "-lmath" if it appears on the command line.  */
  89   const struct cl_decoded_option *saw_math = NULL;
  90
  91   /* "-lrt" or eqivalent if it appears on the command line.  */
  92   const struct cl_decoded_option *saw_time = NULL;
  93
  94   /* "-lc" if it appears on the command line.  */
  95   const struct cl_decoded_option *saw_libc = NULL;
  96
  97   /* An array used to flag each argument that needs a bit set for
  98      LANGSPEC, MATHLIB, TIMELIB, or WITHLIBC.  */
  99   int *args;
 100
 101   /* By default, we throw on the math library if we have one.  */
 102   int need_math = (MATH_LIBRARY[0] != '\0');
 103
 104   /* By default, we throw on the time library if we have one.  */
 105   int need_time = (TIME_LIBRARY[0] != '\0');
 106
 107   /* True if we saw -static.  */
 108   int static_link = 0;
 109
 110   /* True if we should add -shared-libgcc to the command-line.  */
 111   int shared_libgcc = 1;
 112
 113   /* The total number of arguments with the new stuff.  */
 114   unsigned int argc;
 115
 116   /* The argument list.  */
 117   struct cl_decoded_option *decoded_options;
 118
 119   /* The number of libraries added in.  */
 120   int added_libraries;
 121
 122   /* The total number of arguments with the new stuff.  */
 123   unsigned int num_args = 1;
 124
 125   argc = *in_decoded_options_count;
 126   decoded_options = *in_decoded_options;
 127   added_libraries = *in_added_libraries;
 128
 129   args = XCNEWVEC (int, argc);
 130
 131   for (i = 1; i < argc; i++)
 132     {
 133       const char *arg = decoded_options[i].arg;
 134       if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
 135         continue; /* Avoid examining arguments of options missing them.  */
 136
 137       switch (decoded_options[i].opt_index)
 138         {
 139         case OPT_nostdlib:
 140         case OPT_nodefaultlibs:
 141           library = -1;
 142           break;
 143
 144         case OPT_l:
 145           if (strcmp (arg, MATH_LIBRARY) == 0)
 146             {
 147               args[i] |= MATHLIB;
 148               need_math = 0;
 149             }
 150           else if (strcmp (arg, TIME_LIBRARY) == 0)
 151             {
 152               args[i] |= TIMELIB;
 153               need_time = 0;
 154             }
 155           else if (strcmp (arg, "c") == 0)
 156             args[i] |= WITHLIBC;
 157           else
 158             /* Unrecognized libraries (e.g. -lfoo) may require libstdc++.  */
 159             library = (library == 0) ? 1 : library;
 160           break;
 161
 162         case OPT_pg:
 163         case OPT_p:
 164           saw_profile_flag++;
 165           break;
 166
 167         case OPT_x:
 168           if (library == 0
 169               && (strcmp (arg, "c++") == 0
 170                   || strcmp (arg, "c++-cpp-output") == 0
 171                   || strcmp (arg, "objective-c++") == 0
 172                   || strcmp (arg, "objective-c++-cpp-output") == 0))
 173             library = 1;
 174
 175           saw_speclang = 1;
 176           break;
 177
 178         case OPT_Xlinker:
 179         case OPT_Wl_:
 180           /* Arguments that go directly to the linker might be .o files,
 181              or something, and so might cause libstdc++ to be needed.  */
 182           if (library == 0)
 183             library = 1;
 184           break;
 185
 186         case OPT_c:
 187         case OPT_S:
 188         case OPT_E:
 189         case OPT_M:
 190         case OPT_MM:
 191         case OPT_fsyntax_only:
 192           /* Don't specify libraries if we won't link, since that would
 193              cause a warning.  */
 194           library = -1;
 195           break;
 196
 197         case OPT_static:
 198           static_link = 1;
 199           break;
 200
 201         case OPT_static_libgcc:
 202           shared_libgcc = 0;
 203           break;
 204
 205         case OPT_static_libstdc__:
 206           library = library >= 0 ? 2 : library;
 207           args[i] |= SKIPOPT;
 208           break;
 209
 210         case OPT_SPECIAL_input_file:
 211           {
 212             int len;
 213
 214             /* We don't do this anymore, since we don't get them with minus
 215                signs on them.  */
 216             if (arg[0] == '\0' || arg[1] == '\0')
 217               continue;
 218
 219             if (saw_speclang)
 220               {
 221                 saw_speclang = 0;
 222                 continue;
 223               }
 224
 225             /* If the filename ends in .[chi], put options around it.
 226                But not if a specified -x option is currently active.  */
 227             len = strlen (arg);
 228             if (len > 2
 229                 && (arg[len - 1] == 'c'
 230                     || arg[len - 1] == 'i'
 231                     || arg[len - 1] == 'h')
 232                 && arg[len - 2] == '.')
 233               {
 234                 args[i] |= LANGSPEC;
 235                 added += 2;
 236               }
 237
 238             /* If we don't know that this is a header file, we might
 239                need to be linking in the libraries.  */
 240             if (library == 0)
 241               {
 242                 if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0)
 243                     && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0)
 244                     && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0)
 245                     && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0)
 246                     && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0)
 247                     && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0)
 248                     && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0)
 249                     && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0)
 250                     && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0))
 251                   library = 1;
 252               }
 253           }
 254           break;
 255         }
 256     }
 257
 258   /* There's no point adding -shared-libgcc if we don't have a shared
 259      libgcc.  */
 260 #ifndef ENABLE_SHARED_LIBGCC
 261   shared_libgcc = 0;
 262 #endif
 263
 264   /* Add one for shared_libgcc or extra static library.  */
 265   num_args = argc + added + need_math + (library > 0) * 4 + 1;
 266   new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
 267
 268   i = 0;
 269   j = 0;
 270
 271   /* Copy the 0th argument, i.e., the name of the program itself.  */
 272   new_decoded_options[j++] = decoded_options[i++];
 273
 274   /* NOTE: We start at 1 now, not 0.  */
 275   while (i < argc)
 276     {
 277       new_decoded_options[j] = decoded_options[i];
 278
 279       /* Make sure -lstdc++ is before the math library, since libstdc++
 280          itself uses those math routines.  */
 281       if (!saw_math && (args[i] & MATHLIB) && library > 0)
 282         {
 283           --j;
 284           saw_math = &decoded_options[i];
 285         }
 286
 287       if (!saw_time && (args[i] & TIMELIB) && library > 0)
 288         {
 289           --j;
 290           saw_time = &decoded_options[i];
 291         }
 292
 293       if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
 294         {
 295           --j;
 296           saw_libc = &decoded_options[i];
 297         }
 298
 299       /* Wrap foo.[chi] files in a language specification to
 300          force the gcc compiler driver to run cc1plus on them.  */
 301       if (args[i] & LANGSPEC)
 302         {
 303           const char *arg = decoded_options[i].arg;
 304           int len = strlen (arg);
 305           switch (arg[len - 1])
 306             {
 307             case 'c':
 308               generate_option (OPT_x, "c++", 1, CL_DRIVER,
 309                                &new_decoded_options[j++]);
 310               break;
 311             case 'i':
 312               generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER,
 313                                &new_decoded_options[j++]);
 314               break;
 315             case 'h':
 316               generate_option (OPT_x, "c++-header", 1, CL_DRIVER,
 317                                &new_decoded_options[j++]);
 318               break;
 319             default:
 320               gcc_unreachable ();
 321             }
 322           new_decoded_options[j++] = decoded_options[i];
 323           generate_option (OPT_x, "none", 1, CL_DRIVER,
 324                            &new_decoded_options[j]);
 325         }
 326
 327       if ((args[i] & SKIPOPT) != 0)
 328         --j;
 329
 330       i++;
 331       j++;
 332     }
 333
 334   /* Add `-lstdc++' if we haven't already done so.  */
 335   if (library > 0)
 336     {
 337 #ifdef HAVE_LD_STATIC_DYNAMIC
 338       if (library > 1 && !static_link)
 339         {
 340           generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
 341                            &new_decoded_options[j]);
 342           j++;
 343         }
 344 #endif
 345       generate_option (OPT_l,
 346                        saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1,
 347                        CL_DRIVER, &new_decoded_options[j]);
 348       added_libraries++;
 349       j++;
 350       /* Add target-dependent static library, if necessary.  */
 351       if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
 352         {
 353           generate_option (OPT_l, LIBSTDCXX_STATIC, 1,
 354                            CL_DRIVER, &new_decoded_options[j]);
 355           added_libraries++;
 356           j++;
 357         }
 358 #ifdef HAVE_LD_STATIC_DYNAMIC
 359       if (library > 1 && !static_link)
 360         {
 361           generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
 362                            &new_decoded_options[j]);
 363           j++;
 364         }
 365 #endif
 366     }
 367   if (saw_math)
 368     new_decoded_options[j++] = *saw_math;
 369   else if (library > 0 && need_math)
 370     {
 371       generate_option (OPT_l,
 372                        saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
 373                        1, CL_DRIVER, &new_decoded_options[j]);
 374       added_libraries++;
 375       j++;
 376     }
 377   if (saw_time)
 378     new_decoded_options[j++] = *saw_time;
 379   else if (library > 0 && need_time)
 380     {
 381       generate_option (OPT_l, TIME_LIBRARY, 1, CL_DRIVER,
 382                        &new_decoded_options[j]);
 383       added_libraries++;
 384       j++;
 385     }
 386   if (saw_libc)
 387     new_decoded_options[j++] = *saw_libc;
 388   if (shared_libgcc && !static_link)
 389     generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
 390                      &new_decoded_options[j++]);
 391
 392   *in_decoded_options_count = j;
 393   *in_decoded_options = new_decoded_options;
 394   *in_added_libraries = added_libraries;
 395 }
 396
 397 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 398 int lang_specific_pre_link (void)  /* Not used for C++.  */
 399 {
 400   return 0;
 401 }
 402
 403 /* Number of extra output files that lang_specific_pre_link may generate.  */
 404 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */