1 /* Specific flags and argument handling of the Fortran front-end. 2 Copyright (C) 1997-2019 Free Software Foundation, Inc. 3 4 This file is part of GCC. 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 3, 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 GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 /* This file is copied more or less verbatim from g77. */ 21 /* This file contains a filter for the main `gcc' driver, which is 22 replicated for the `gfortran' driver by adding this filter. The purpose 23 of this filter is to be basically identical to gcc (in that 24 it faithfully passes all of the original arguments to gcc) but, 25 unless explicitly overridden by the user in certain ways, ensure 26 that the needs of the language supported by this wrapper are met. 27 28 For GNU Fortran 95(gfortran), we do the following to the argument list 29 before passing it to `gcc': 30 31 1. Make sure `-lgfortran -lm' is at the end of the list. 32 33 2. Make sure each time `-lgfortran' or `-lm' is seen, it forms 34 part of the series `-lgfortran -lm'. 35 36 #1 and #2 are not done if `-nostdlib' or any option that disables 37 the linking phase is present, or if `-xfoo' is in effect. Note that 38 a lack of source files or -l options disables linking. 39 40 This program was originally made out of gcc/cp/g++spec.c, but the 41 way it builds the new argument list was rewritten so it is much 42 easier to maintain, improve the way it decides to add or not add 43 extra arguments, etc. And several improvements were made in the 44 handling of arguments, primarily to make it more consistent with 45 `gcc' itself. */ 46 47 #include "config.h" 48 #include "system.h" 49 #include "coretypes.h" 50 #include "opt-suggestions.h" 51 #include "gcc.h" 52 #include "opts.h" 53 54 #include "tm.h" 55 #include "intl.h" 56 57 #ifndef MATH_LIBRARY 58 #define MATH_LIBRARY "m" 59 #endif 60 61 #ifndef FORTRAN_LIBRARY 62 #define FORTRAN_LIBRARY "gfortran" 63 #endif 64 65 /* Name of the spec file. */ 66 #define SPEC_FILE "libgfortran.spec" 67 68 /* The original argument list and related info is copied here. */ 69 static unsigned int g77_xargc; 70 static const struct cl_decoded_option *g77_x_decoded_options; 71 static void append_arg (const struct cl_decoded_option *); 72 73 /* The new argument list will be built here. */ 74 static unsigned int g77_newargc; 75 static struct cl_decoded_option *g77_new_decoded_options; 76 77 /* This will be NULL if we encounter a situation where we should not 78 link in the fortran libraries. */ 79 static const char *library = NULL; 80 81 82 /* Return whether strings S1 and S2 are both NULL or both the same 83 string. */ 84 85 static bool 86 strings_same (const char *s1, const char *s2) 87 { 88 return s1 == s2 || (s1 != NULL && s2 != NULL && strcmp (s1, s2) == 0); 89 } 90 91 /* Return whether decoded option structures OPT1 and OPT2 are the 92 same. */ 93 94 static bool 95 options_same (const struct cl_decoded_option *opt1, 96 const struct cl_decoded_option *opt2) 97 { 98 return (opt1->opt_index == opt2->opt_index 99 && strings_same (opt1->arg, opt2->arg) 100 && strings_same (opt1->orig_option_with_args_text, 101 opt2->orig_option_with_args_text) 102 && strings_same (opt1->canonical_option[0], 103 opt2->canonical_option[0]) 104 && strings_same (opt1->canonical_option[1], 105 opt2->canonical_option[1]) 106 && strings_same (opt1->canonical_option[2], 107 opt2->canonical_option[2]) 108 && strings_same (opt1->canonical_option[3], 109 opt2->canonical_option[3]) 110 && (opt1->canonical_option_num_elements 111 == opt2->canonical_option_num_elements) 112 && opt1->value == opt2->value 113 && opt1->errors == opt2->errors); 114 } 115 116 /* Append another argument to the list being built. As long as it is 117 identical to the corresponding arg in the original list, just increment 118 the new arg count. Otherwise allocate a new list, etc. */ 119 120 static void 121 append_arg (const struct cl_decoded_option *arg) 122 { 123 static unsigned int newargsize; 124 125 if (g77_new_decoded_options == g77_x_decoded_options 126 && g77_newargc < g77_xargc 127 && options_same (arg, &g77_x_decoded_options[g77_newargc])) 128 { 129 ++g77_newargc; 130 return; /* Nothing new here. */ 131 } 132 133 if (g77_new_decoded_options == g77_x_decoded_options) 134 { /* Make new arglist. */ 135 unsigned int i; 136 137 newargsize = (g77_xargc << 2) + 20; /* This should handle all. */ 138 g77_new_decoded_options = XNEWVEC (struct cl_decoded_option, newargsize); 139 140 /* Copy what has been done so far. */ 141 for (i = 0; i < g77_newargc; ++i) 142 g77_new_decoded_options[i] = g77_x_decoded_options[i]; 143 } 144 145 if (g77_newargc == newargsize) 146 fatal_error (input_location, "overflowed output arg list for %qs", 147 arg->orig_option_with_args_text); 148 149 g77_new_decoded_options[g77_newargc++] = *arg; 150 } 151 152 /* Append an option described by OPT_INDEX, ARG and VALUE to the list 153 being built. */ 154 static void 155 append_option (size_t opt_index, const char *arg, int value) 156 { 157 struct cl_decoded_option decoded; 158 159 generate_option (opt_index, arg, value, CL_DRIVER, &decoded); 160 append_arg (&decoded); 161 } 162 163 /* Append a libgfortran argument to the list being built. If 164 FORCE_STATIC, ensure the library is linked statically. */ 165 166 static void 167 add_arg_libgfortran (bool force_static ATTRIBUTE_UNUSED) 168 { 169 #ifdef HAVE_LD_STATIC_DYNAMIC 170 if (force_static) 171 append_option (OPT_Wl_, LD_STATIC_OPTION, 1); 172 #endif 173 append_option (OPT_l, FORTRAN_LIBRARY, 1); 174 #ifdef HAVE_LD_STATIC_DYNAMIC 175 if (force_static) 176 append_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1); 177 #endif 178 } 179 180 void 181 lang_specific_driver (struct cl_decoded_option **in_decoded_options, 182 unsigned int *in_decoded_options_count, 183 int *in_added_libraries ATTRIBUTE_UNUSED) 184 { 185 unsigned int argc = *in_decoded_options_count; 186 struct cl_decoded_option *decoded_options = *in_decoded_options; 187 unsigned int i; 188 int verbose = 0; 189 190 /* 0 => -xnone in effect. 191 1 => -xfoo in effect. */ 192 int saw_speclang = 0; 193 194 /* 0 => initial/reset state 195 1 => last arg was -l<library> 196 2 => last two args were -l<library> -lm. */ 197 int saw_library = 0; 198 199 /* By default, we throw on the math library if we have one. */ 200 int need_math = (MATH_LIBRARY[0] != '\0'); 201 202 /* Whether we should link a static libgfortran. */ 203 int static_lib = 0; 204 205 /* Whether we need to link statically. */ 206 int static_linking = 0; 207 208 /* The number of input and output files in the incoming arg list. */ 209 int n_infiles = 0; 210 int n_outfiles = 0; 211 212 library = FORTRAN_LIBRARY; 213 214 #if 0 215 fprintf (stderr, "Incoming:"); 216 for (i = 0; i < argc; i++) 217 fprintf (stderr, " %s", decoded_options[i].orig_option_with_args_text); 218 fprintf (stderr, "\n"); 219 #endif 220 221 g77_xargc = argc; 222 g77_x_decoded_options = decoded_options; 223 g77_newargc = 0; 224 g77_new_decoded_options = decoded_options; 225 226 /* First pass through arglist. 227 228 If -nostdlib or a "turn-off-linking" option is anywhere in the 229 command line, don't do any library-option processing (except 230 relating to -x). */ 231 232 for (i = 1; i < argc; ++i) 233 { 234 if (decoded_options[i].errors & CL_ERR_MISSING_ARG) 235 continue; 236 237 switch (decoded_options[i].opt_index) 238 { 239 case OPT_SPECIAL_input_file: 240 ++n_infiles; 241 continue; 242 243 case OPT_nostdlib: 244 case OPT_nodefaultlibs: 245 case OPT_c: 246 case OPT_r: 247 case OPT_S: 248 case OPT_fsyntax_only: 249 case OPT_E: 250 /* These options disable linking entirely or linking of the 251 standard libraries. */ 252 library = 0; 253 break; 254 255 case OPT_static_libgfortran: 256 #ifdef HAVE_LD_STATIC_DYNAMIC 257 static_lib = 1; 258 #endif 259 break; 260 261 case OPT_static: 262 #ifdef HAVE_LD_STATIC_DYNAMIC 263 static_linking = 1; 264 #endif 265 break; 266 267 case OPT_l: 268 ++n_infiles; 269 break; 270 271 case OPT_o: 272 ++n_outfiles; 273 break; 274 275 case OPT_v: 276 verbose = 1; 277 break; 278 279 case OPT__version: 280 printf ("GNU Fortran %s%s\n", pkgversion_string, version_string); 281 printf ("Copyright %s 2019 Free Software Foundation, Inc.\n", 282 _("(C)")); 283 fputs (_("This is free software; see the source for copying conditions. There is NO\n\ 284 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"), 285 stdout); 286 exit (0); 287 break; 288 289 case OPT__help: 290 /* Let gcc.c handle this, as it has a really 291 cool facility for handling --help and --verbose --help. */ 292 return; 293 294 default: 295 break; 296 } 297 } 298 299 if ((n_outfiles != 0) && (n_infiles == 0)) 300 fatal_error (input_location, 301 "no input files; unwilling to write output files"); 302 303 /* If there are no input files, no need for the library. */ 304 if (n_infiles == 0) 305 library = 0; 306 307 /* Second pass through arglist, transforming arguments as appropriate. */ 308 309 append_arg (&decoded_options[0]); /* Start with command name, of course. */ 310 311 for (i = 1; i < argc; ++i) 312 { 313 if (decoded_options[i].errors & CL_ERR_MISSING_ARG) 314 { 315 append_arg (&decoded_options[i]); 316 continue; 317 } 318 319 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file 320 && decoded_options[i].arg[0] == '\0') 321 { 322 /* Interesting. Just append as is. */ 323 append_arg (&decoded_options[i]); 324 continue; 325 } 326 327 if (decoded_options[i].opt_index != OPT_l 328 && (decoded_options[i].opt_index != OPT_SPECIAL_input_file 329 || strcmp (decoded_options[i].arg, "-") == 0)) 330 { 331 /* Not a filename or library. */ 332 333 if (saw_library == 1 && need_math) /* -l<library>. */ 334 append_option (OPT_l, MATH_LIBRARY, 1); 335 336 saw_library = 0; 337 338 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file) 339 { 340 append_arg (&decoded_options[i]); /* "-" == Standard input. */ 341 continue; 342 } 343 344 if (decoded_options[i].opt_index == OPT_x) 345 { 346 /* Track input language. */ 347 const char *lang = decoded_options[i].arg; 348 349 saw_speclang = (strcmp (lang, "none") != 0); 350 } 351 352 append_arg (&decoded_options[i]); 353 354 continue; 355 } 356 357 /* A filename/library, not an option. */ 358 359 if (saw_speclang) 360 saw_library = 0; /* -xfoo currently active. */ 361 else 362 { /* -lfoo or filename. */ 363 if (decoded_options[i].opt_index == OPT_l 364 && strcmp (decoded_options[i].arg, MATH_LIBRARY) == 0) 365 { 366 if (saw_library == 1) 367 saw_library = 2; /* -l<library> -lm. */ 368 else 369 add_arg_libgfortran (static_lib && !static_linking); 370 } 371 else if (decoded_options[i].opt_index == OPT_l 372 && strcmp (decoded_options[i].arg, FORTRAN_LIBRARY) == 0) 373 { 374 saw_library = 1; /* -l<library>. */ 375 add_arg_libgfortran (static_lib && !static_linking); 376 continue; 377 } 378 else 379 { /* Other library, or filename. */ 380 if (saw_library == 1 && need_math) 381 append_option (OPT_l, MATH_LIBRARY, 1); 382 saw_library = 0; 383 } 384 } 385 append_arg (&decoded_options[i]); 386 } 387 388 /* Append `-lgfortran -lm' as necessary. */ 389 390 if (library) 391 { /* Doing a link and no -nostdlib. */ 392 if (saw_speclang) 393 append_option (OPT_x, "none", 1); 394 395 switch (saw_library) 396 { 397 case 0: 398 add_arg_libgfortran (static_lib && !static_linking); 399 /* Fall through. */ 400 401 case 1: 402 if (need_math) 403 append_option (OPT_l, MATH_LIBRARY, 1); 404 default: 405 break; 406 } 407 } 408 409 #ifdef ENABLE_SHARED_LIBGCC 410 if (library) 411 { 412 unsigned int i; 413 414 for (i = 1; i < g77_newargc; i++) 415 if (g77_new_decoded_options[i].opt_index == OPT_static_libgcc 416 || g77_new_decoded_options[i].opt_index == OPT_static) 417 break; 418 419 if (i == g77_newargc) 420 append_option (OPT_shared_libgcc, NULL, 1); 421 } 422 423 #endif 424 425 if (verbose && g77_new_decoded_options != g77_x_decoded_options) 426 { 427 fprintf (stderr, _("Driving:")); 428 for (i = 0; i < g77_newargc; i++) 429 fprintf (stderr, " %s", 430 g77_new_decoded_options[i].orig_option_with_args_text); 431 fprintf (stderr, "\n"); 432 } 433 434 *in_decoded_options_count = g77_newargc; 435 *in_decoded_options = g77_new_decoded_options; 436 } 437 438 439 /* Called before linking. Returns 0 on success and -1 on failure. */ 440 int 441 lang_specific_pre_link (void) 442 { 443 if (library) 444 do_spec ("%:include(libgfortran.spec)"); 445 446 return 0; 447 } 448 449 /* Number of extra output files that lang_specific_pre_link may generate. */ 450 int lang_specific_extra_outfiles = 0; /* Not used for F77. */ 451