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 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 27 /* This bit is set if we saw a `-xfoo' language specification. */ 28 #define LANGSPEC (1<<1) 29 /* This bit is set if they did `-lm' or `-lmath'. */ 30 #define MATHLIB (1<<2) 31 /* This bit is set if they did `-lc'. */ 32 #define WITHLIBC (1<<3) 33 /* Skip this option. */ 34 #define SKIPOPT (1<<4) 35 36 #ifndef MATH_LIBRARY 37 #define MATH_LIBRARY "-lm" 38 #endif 39 #ifndef MATH_LIBRARY_PROFILE 40 #define MATH_LIBRARY_PROFILE MATH_LIBRARY 41 #endif 42 43 #ifndef LIBSTDCXX 44 #define LIBSTDCXX "-lstdc++" 45 #endif 46 #ifndef LIBSTDCXX_PROFILE 47 #define LIBSTDCXX_PROFILE LIBSTDCXX 48 #endif 49 #ifndef LIBSTDCXX_STATIC 50 #define LIBSTDCXX_STATIC NULL 51 #endif 52 53 void 54 lang_specific_driver (int *in_argc, const char *const **in_argv, 55 int *in_added_libraries) 56 { 57 int i, j; 58 59 /* If nonzero, the user gave us the `-p' or `-pg' flag. */ 60 int saw_profile_flag = 0; 61 62 /* What do with libstdc++: 63 -1 means we should not link in libstdc++ 64 0 means we should link in libstdc++ if it is needed 65 1 means libstdc++ is needed and should be linked in. 66 2 means libstdc++ is needed and should be linked statically. */ 67 int library = 0; 68 69 /* The number of arguments being added to what's in argv, other than 70 libraries. We use this to track the number of times we've inserted 71 -xc++/-xnone. */ 72 int added = 0; 73 74 /* Used to track options that take arguments, so we don't go wrapping 75 those with -xc++/-xnone. */ 76 const char *quote = NULL; 77 78 /* The new argument list will be contained in this. */ 79 const char **arglist; 80 81 /* Nonzero if we saw a `-xfoo' language specification on the 82 command line. Used to avoid adding our own -xc++ if the user 83 already gave a language for the file. */ 84 int saw_speclang = 0; 85 86 /* "-lm" or "-lmath" if it appears on the command line. */ 87 const char *saw_math = 0; 88 89 /* "-lc" if it appears on the command line. */ 90 const char *saw_libc = 0; 91 92 /* An array used to flag each argument that needs a bit set for 93 LANGSPEC, MATHLIB, or WITHLIBC. */ 94 int *args; 95 96 /* By default, we throw on the math library if we have one. */ 97 int need_math = (MATH_LIBRARY[0] != '\0'); 98 99 /* True if we saw -static. */ 100 int static_link = 0; 101 102 /* True if we should add -shared-libgcc to the command-line. */ 103 int shared_libgcc = 1; 104 105 /* The total number of arguments with the new stuff. */ 106 int argc; 107 108 /* The argument list. */ 109 const char *const *argv; 110 111 /* The number of libraries added in. */ 112 int added_libraries; 113 114 /* The total number of arguments with the new stuff. */ 115 int num_args = 1; 116 117 argc = *in_argc; 118 argv = *in_argv; 119 added_libraries = *in_added_libraries; 120 121 args = XCNEWVEC (int, argc); 122 123 for (i = 1; i < argc; i++) 124 { 125 /* If the previous option took an argument, we swallow it here. */ 126 if (quote) 127 { 128 quote = NULL; 129 continue; 130 } 131 132 /* We don't do this anymore, since we don't get them with minus 133 signs on them. */ 134 if (argv[i][0] == '\0' || argv[i][1] == '\0') 135 continue; 136 137 if (argv[i][0] == '-') 138 { 139 if (strcmp (argv[i], "-nostdlib") == 0 140 || strcmp (argv[i], "-nodefaultlibs") == 0) 141 { 142 library = -1; 143 } 144 else if (strcmp (argv[i], MATH_LIBRARY) == 0) 145 { 146 args[i] |= MATHLIB; 147 need_math = 0; 148 } 149 else if (strcmp (argv[i], "-lc") == 0) 150 args[i] |= WITHLIBC; 151 else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0) 152 saw_profile_flag++; 153 else if (strncmp (argv[i], "-x", 2) == 0) 154 { 155 const char * arg; 156 if (argv[i][2] != '\0') 157 arg = argv[i]+2; 158 else if ((argv[i+1]) != NULL) 159 /* We need to swallow arg on next loop. */ 160 quote = arg = argv[i+1]; 161 else /* Error condition, message will be printed later. */ 162 arg = ""; 163 if (library == 0 164 && (strcmp (arg, "c++") == 0 165 || strcmp (arg, "c++-cpp-output") == 0 166 || strcmp (arg, "objective-c++") == 0 167 || strcmp (arg, "objective-c++-cpp-output") == 0)) 168 library = 1; 169 170 saw_speclang = 1; 171 } 172 else if (strcmp (argv[i], "-ObjC++") == 0) 173 { 174 if (library == 0) 175 library = 1; 176 saw_speclang = 1; 177 } 178 /* Arguments that go directly to the linker might be .o files, 179 or something, and so might cause libstdc++ to be needed. */ 180 else if (strcmp (argv[i], "-Xlinker") == 0) 181 { 182 quote = argv[i]; 183 if (library == 0) 184 library = 1; 185 } 186 else if (strncmp (argv[i], "-Wl,", 4) == 0) 187 library = (library == 0) ? 1 : library; 188 /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */ 189 else if (strncmp (argv[i], "-l", 2) == 0) 190 library = (library == 0) ? 1 : library; 191 else if (((argv[i][2] == '\0' 192 && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL) 193 || strcmp (argv[i], "-Tdata") == 0)) 194 quote = argv[i]; 195 else if ((argv[i][2] == '\0' 196 && strchr ("cSEM", argv[i][1]) != NULL) 197 || strcmp (argv[i], "-MM") == 0 198 || strcmp (argv[i], "-fsyntax-only") == 0) 199 { 200 /* Don't specify libraries if we won't link, since that would 201 cause a warning. */ 202 library = -1; 203 } 204 else if (strcmp (argv[i], "-static") == 0) 205 static_link = 1; 206 else if (strcmp (argv[i], "-static-libgcc") == 0) 207 shared_libgcc = 0; 208 else if (strcmp (argv[i], "-static-libstdc++") == 0) 209 { 210 library = library >= 0 ? 2 : library; 211 args[i] |= SKIPOPT; 212 } 213 else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1])) 214 i++; 215 else 216 /* Pass other options through. */ 217 continue; 218 } 219 else 220 { 221 int len; 222 223 if (saw_speclang) 224 { 225 saw_speclang = 0; 226 continue; 227 } 228 229 /* If the filename ends in .[chi], put options around it. 230 But not if a specified -x option is currently active. */ 231 len = strlen (argv[i]); 232 if (len > 2 233 && (argv[i][len - 1] == 'c' 234 || argv[i][len - 1] == 'i' 235 || argv[i][len - 1] == 'h') 236 && argv[i][len - 2] == '.') 237 { 238 args[i] |= LANGSPEC; 239 added += 2; 240 } 241 242 /* If we don't know that this is a header file, we might 243 need to be linking in the libraries. */ 244 if (library == 0) 245 { 246 if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0) 247 && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0) 248 && (len <= 4 || strcmp (argv[i] + (len - 4), ".hpp") != 0) 249 && (len <= 3 || strcmp (argv[i] + (len - 3), ".hp") != 0) 250 && (len <= 4 || strcmp (argv[i] + (len - 4), ".hxx") != 0) 251 && (len <= 4 || strcmp (argv[i] + (len - 4), ".h++") != 0) 252 && (len <= 4 || strcmp (argv[i] + (len - 4), ".HPP") != 0) 253 && (len <= 4 || strcmp (argv[i] + (len - 4), ".tcc") != 0) 254 && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0)) 255 library = 1; 256 } 257 } 258 } 259 260 if (quote) 261 fatal ("argument to '%s' missing\n", quote); 262 263 /* There's no point adding -shared-libgcc if we don't have a shared 264 libgcc. */ 265 #ifndef ENABLE_SHARED_LIBGCC 266 shared_libgcc = 0; 267 #endif 268 269 /* Make sure to have room for the trailing NULL argument. 270 Add one for shared_libgcc or extra static library. */ 271 num_args = argc + added + need_math + (library > 0) * 4 + 2; 272 arglist = XNEWVEC (const char *, num_args); 273 274 i = 0; 275 j = 0; 276 277 /* Copy the 0th argument, i.e., the name of the program itself. */ 278 arglist[i++] = argv[j++]; 279 280 /* NOTE: We start at 1 now, not 0. */ 281 while (i < argc) 282 { 283 arglist[j] = argv[i]; 284 285 /* Make sure -lstdc++ is before the math library, since libstdc++ 286 itself uses those math routines. */ 287 if (!saw_math && (args[i] & MATHLIB) && library > 0) 288 { 289 --j; 290 saw_math = argv[i]; 291 } 292 293 if (!saw_libc && (args[i] & WITHLIBC) && library > 0) 294 { 295 --j; 296 saw_libc = argv[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 int len = strlen (argv[i]); 304 switch (argv[i][len - 1]) 305 { 306 case 'c': 307 arglist[j++] = "-xc++"; 308 break; 309 case 'i': 310 arglist[j++] = "-xc++-cpp-output"; 311 break; 312 case 'h': 313 arglist[j++] = "-xc++-header"; 314 break; 315 default: 316 gcc_unreachable (); 317 } 318 arglist[j++] = argv[i]; 319 arglist[j] = "-xnone"; 320 } 321 322 if ((args[i] & SKIPOPT) != 0) 323 --j; 324 325 i++; 326 j++; 327 } 328 329 /* Add `-lstdc++' if we haven't already done so. */ 330 if (library > 0) 331 { 332 #ifdef HAVE_LD_STATIC_DYNAMIC 333 if (library > 1 && !static_link) 334 { 335 arglist[j] = "-Wl,-Bstatic"; 336 j++; 337 } 338 #endif 339 arglist[j] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX; 340 if (arglist[j][0] != '-' || arglist[j][1] == 'l') 341 added_libraries++; 342 j++; 343 /* Add target-dependent static library, if necessary. */ 344 if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL) 345 { 346 arglist[j] = LIBSTDCXX_STATIC; 347 if (arglist[j][0] != '-' || arglist[j][1] == 'l') 348 added_libraries++; 349 j++; 350 } 351 #ifdef HAVE_LD_STATIC_DYNAMIC 352 if (library > 1 && !static_link) 353 { 354 arglist[j] = "-Wl,-Bdynamic"; 355 j++; 356 } 357 #endif 358 } 359 if (saw_math) 360 arglist[j++] = saw_math; 361 else if (library > 0 && need_math) 362 { 363 arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY; 364 if (arglist[j][0] != '-' || arglist[j][1] == 'l') 365 added_libraries++; 366 j++; 367 } 368 if (saw_libc) 369 arglist[j++] = saw_libc; 370 if (shared_libgcc && !static_link) 371 arglist[j++] = "-shared-libgcc"; 372 373 arglist[j] = NULL; 374 375 *in_argc = j; 376 *in_argv = arglist; 377 *in_added_libraries = added_libraries; 378 } 379 380 /* Called before linking. Returns 0 on success and -1 on failure. */ 381 int lang_specific_pre_link (void) /* Not used for C++. */ 382 { 383 return 0; 384 } 385 386 /* Number of extra output files that lang_specific_pre_link may generate. */ 387 int lang_specific_extra_outfiles = 0; /* Not used for C++. */ 388