1 /* Specific flags and argument handling of the Fortran front-end.
2 Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This file is copied more or less verbatim from g77. */
23 /* This file contains a filter for the main `gcc' driver, which is
24 replicated for the `gfortran' driver by adding this filter. The purpose
25 of this filter is to be basically identical to gcc (in that
26 it faithfully passes all of the original arguments to gcc) but,
27 unless explicitly overridden by the user in certain ways, ensure
28 that the needs of the language supported by this wrapper are met.
30 For GNU Fortran 95(gfortran), we do the following to the argument list
31 before passing it to `gcc':
33 1. Make sure `-lgfortran -lm' is at the end of the list.
35 2. Make sure each time `-lgfortran' or `-lm' is seen, it forms
36 part of the series `-lgfortran -lm'.
38 #1 and #2 are not done if `-nostdlib' or any option that disables
39 the linking phase is present, or if `-xfoo' is in effect. Note that
40 a lack of source files or -l options disables linking.
42 This program was originally made out of gcc/cp/g++spec.c, but the
43 way it builds the new argument list was rewritten so it is much
44 easier to maintain, improve the way it decides to add or not add
45 extra arguments, etc. And several improvements were made in the
46 handling of arguments, primarily to make it more consistent with
53 #include "coretypes.h"
58 #define MATH_LIBRARY "-lm"
61 #ifndef FORTRAN_LIBRARY
62 #define FORTRAN_LIBRARY "-lgfortran"
65 #ifdef HAVE_LD_STATIC_DYNAMIC
66 #define ADD_ARG_LIBGFORTRAN(arg) \
68 if (static_lib && !static_linking) \
69 append_arg ("-Wl,-Bstatic"); \
71 if (static_lib && !static_linking) \
72 append_arg ("-Wl,-Bdynamic"); \
75 #define ADD_ARG_LIBGFORTRAN(arg) append_arg (arg);
79 /* Options this driver needs to recognize, not just know how to
83 OPTION_b, /* Aka --prefix. */
84 OPTION_B, /* Aka --target. */
85 OPTION_c, /* Aka --compile. */
86 OPTION_E, /* Aka --preprocess. */
87 OPTION_help, /* --help. */
88 OPTION_i, /* -imacros, -include, -include-*. */
90 OPTION_L, /* Aka --library-directory. */
91 OPTION_nostdlib, /* Aka --no-standard-libraries, or
93 OPTION_o, /* Aka --output. */
94 OPTION_S, /* Aka --assemble. */
95 OPTION_static, /* -static. */
96 OPTION_static_libgfortran, /* -static-libgfortran. */
97 OPTION_syntax_only, /* -fsyntax-only. */
98 OPTION_v, /* Aka --verbose. */
99 OPTION_version, /* --version. */
100 OPTION_V, /* Aka --use-version. */
101 OPTION_x, /* Aka --language. */
102 OPTION_ /* Unrecognized or unimportant. */
106 /* The original argument list and related info is copied here. */
107 static int g77_xargc;
108 static const char *const *g77_xargv;
109 static void lookup_option (Option *, int *, const char **, const char *);
110 static void append_arg (const char *);
112 /* The new argument list will be built here. */
113 static int g77_newargc;
114 static const char **g77_newargv;
116 /* --- This comes from gcc.c (2.8.1) verbatim: */
118 /* This defines which switch letters take arguments. */
120 #ifndef SWITCH_TAKES_ARG
121 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
124 /* This defines which multi-letter switches take arguments. */
126 #ifndef WORD_SWITCH_TAKES_ARG
127 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
130 /* --- End of verbatim. */
132 /* Assumes text[0] == '-'. Returns number of argv items that belong to
133 (and follow) this one, an option id for options important to the
134 caller, and a pointer to the first char of the arg, if embedded (else
135 returns NULL, meaning no arg or it's the next argv).
137 Note that this also assumes gcc.c's pass converting long options
138 to short ones, where available, has already been run. */
141 lookup_option (Option *xopt, int *xskip, const char **xarg, const char *text)
143 Option opt = OPTION_;
145 const char *arg = NULL;
147 if ((skip = SWITCH_TAKES_ARG (text[1])))
148 skip -= (text[2] != '\0'); /* See gcc.c. */
151 opt = OPTION_B, skip = (text[2] == '\0'), arg = text + 2;
152 else if (text[1] == 'b')
153 opt = OPTION_b, skip = (text[2] == '\0'), arg = text + 2;
154 else if ((text[1] == 'c') && (text[2] == '\0'))
155 opt = OPTION_c, skip = 0;
156 else if ((text[1] == 'E') && (text[2] == '\0'))
157 opt = OPTION_E, skip = 0;
158 else if (text[1] == 'i')
159 opt = OPTION_i, skip = 0;
160 else if (text[1] == 'l')
162 else if (text[1] == 'L')
163 opt = OPTION_L, arg = text + 2;
164 else if (text[1] == 'o')
166 else if ((text[1] == 'S') && (text[2] == '\0'))
167 opt = OPTION_S, skip = 0;
168 else if (text[1] == 'V')
169 opt = OPTION_V, skip = (text[2] == '\0');
170 else if ((text[1] == 'v') && (text[2] == '\0'))
171 opt = OPTION_v, skip = 0;
172 else if (text[1] == 'x')
173 opt = OPTION_x, arg = text + 2;
174 else if (text[1] == 'J')
178 if ((skip = WORD_SWITCH_TAKES_ARG (text + 1)) != 0) /* See gcc.c. */
180 else if (!strcmp (text, "-fhelp")) /* Really --help!! */
182 else if (!strcmp (text, "-nostdlib")
183 || !strcmp (text, "-nodefaultlibs"))
184 opt = OPTION_nostdlib;
185 else if (!strcmp (text, "-fsyntax-only"))
186 opt = OPTION_syntax_only;
187 else if (!strcmp (text, "-static-libgfortran"))
188 opt = OPTION_static_libgfortran;
189 else if (!strcmp (text, "-dumpversion"))
190 opt = OPTION_version;
191 else if (!strcmp (text, "-fversion")) /* Really --version!! */
192 opt = OPTION_version;
193 else if (!strcmp (text, "-Xlinker") || !strcmp (text, "-specs"))
205 if ((arg != NULL) && (arg[0] == '\0'))
212 /* Append another argument to the list being built. As long as it is
213 identical to the corresponding arg in the original list, just increment
214 the new arg count. Otherwise allocate a new list, etc. */
217 append_arg (const char *arg)
219 static int newargsize;
222 fprintf (stderr, "`%s'\n", arg);
225 if (g77_newargv == g77_xargv
226 && g77_newargc < g77_xargc
227 && (arg == g77_xargv[g77_newargc]
228 || !strcmp (arg, g77_xargv[g77_newargc])))
231 return; /* Nothing new here. */
234 if (g77_newargv == g77_xargv)
235 { /* Make new arglist. */
238 newargsize = (g77_xargc << 2) + 20; /* This should handle all. */
239 g77_newargv = (const char **) xmalloc (newargsize * sizeof (char *));
241 /* Copy what has been done so far. */
242 for (i = 0; i < g77_newargc; ++i)
243 g77_newargv[i] = g77_xargv[i];
246 if (g77_newargc == newargsize)
247 fatal ("overflowed output arg list for '%s'", arg);
249 g77_newargv[g77_newargc++] = arg;
253 lang_specific_driver (int *in_argc, const char *const **in_argv,
254 int *in_added_libraries ATTRIBUTE_UNUSED)
257 const char *const *argv = *in_argv;
264 /* This will be NULL if we encounter a situation where we should not
266 const char *library = FORTRAN_LIBRARY;
268 /* 0 => -xnone in effect.
269 1 => -xfoo in effect. */
270 int saw_speclang = 0;
272 /* 0 => initial/reset state
273 1 => last arg was -l<library>
274 2 => last two args were -l<library> -lm. */
277 /* By default, we throw on the math library if we have one. */
278 int need_math = (MATH_LIBRARY[0] != '\0');
280 /* Whether we should link a static libgfortran. */
283 /* Whether we need to link statically. */
284 int static_linking = 0;
286 /* The number of input and output files in the incoming arg list. */
291 fprintf (stderr, "Incoming:");
292 for (i = 0; i < argc; i++)
293 fprintf (stderr, " %s", argv[i]);
294 fprintf (stderr, "\n");
300 g77_newargv = CONST_CAST2 (const char **, const char *const *, argv);
302 /* First pass through arglist.
304 If -nostdlib or a "turn-off-linking" option is anywhere in the
305 command line, don't do any library-option processing (except
306 relating to -x). Also, if -v is specified, but no other options
307 that do anything special (allowing -V version, etc.), remember
308 to add special stuff to make gcc command actually invoke all
309 the different phases of the compilation process so all the version
312 Also, here is where all problems with missing arguments to options
313 are caught. If this loop is exited normally, it means all options
314 have the appropriate number of arguments as far as the rest of this
315 program is concerned. */
317 for (i = 1; i < argc; ++i)
319 if ((argv[i][0] == '+') && (argv[i][1] == 'e'))
324 if ((argv[i][0] != '-') || (argv[i][1] == '\0'))
330 lookup_option (&opt, &skip, NULL, argv[i]);
334 case OPTION_nostdlib:
337 case OPTION_syntax_only:
339 /* These options disable linking entirely or linking of the
340 standard libraries. */
344 case OPTION_static_libgfortran:
368 /* These options are useful in conjunction with -v to get
369 appropriate version info. */
373 printf ("GNU Fortran %s%s\n", pkgversion_string, version_string);
374 printf ("Copyright %s 2009 Free Software Foundation, Inc.\n\n",
376 printf (_("GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
377 You may redistribute copies of GNU Fortran\n\
378 under the terms of the GNU General Public License.\n\
379 For more information about these matters, see the file named COPYING\n\n"));
384 /* Let gcc.c handle this, as it has a really
385 cool facility for handling --help and --verbose --help. */
392 /* This is the one place we check for missing arguments in the
398 fatal ("argument to '%s' missing", argv[i]);
401 if ((n_outfiles != 0) && (n_infiles == 0))
402 fatal ("no input files; unwilling to write output files");
404 /* If there are no input files, no need for the library. */
408 /* Second pass through arglist, transforming arguments as appropriate. */
410 append_arg (argv[0]); /* Start with command name, of course. */
412 for (i = 1; i < argc; ++i)
414 if (argv[i][0] == '\0')
416 append_arg (argv[i]); /* Interesting. Just append as is. */
420 if ((argv[i][0] == '-') && (argv[i][1] == 'M'))
424 fprintf (stderr, _("Warning: Using -M <directory> is deprecated, "
425 "use -J instead\n"));
426 if (argv[i][2] == '\0')
430 p = XNEWVEC (char, strlen (argv[i + 1]) + 3);
433 strcpy (&p[2], argv[i + 1]);
437 fatal ("argument to '%s' missing", argv[i]);
441 p = XNEWVEC (char, strlen (argv[i]) + 1);
444 strcpy (&p[2], argv[i] + 2);
450 if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
452 /* Not a filename or library. */
454 if (saw_library == 1 && need_math) /* -l<library>. */
455 append_arg (MATH_LIBRARY);
459 lookup_option (&opt, &skip, &arg, argv[i]);
461 if (argv[i][1] == '\0')
463 append_arg (argv[i]); /* "-" == Standard input. */
469 /* Track input language. */
477 saw_speclang = (strcmp (lang, "none") != 0);
480 append_arg (argv[i]);
482 for (; skip != 0; --skip)
483 append_arg (argv[++i]);
488 /* A filename/library, not an option. */
491 saw_library = 0; /* -xfoo currently active. */
493 { /* -lfoo or filename. */
494 if (strcmp (argv[i], MATH_LIBRARY) == 0)
496 if (saw_library == 1)
497 saw_library = 2; /* -l<library> -lm. */
500 ADD_ARG_LIBGFORTRAN (FORTRAN_LIBRARY);
503 else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
505 saw_library = 1; /* -l<library>. */
506 ADD_ARG_LIBGFORTRAN (argv[i]);
510 { /* Other library, or filename. */
511 if (saw_library == 1 && need_math)
512 append_arg (MATH_LIBRARY);
516 append_arg (argv[i]);
519 /* Append `-lg2c -lm' as necessary. */
522 { /* Doing a link and no -nostdlib. */
524 append_arg ("-xnone");
529 ADD_ARG_LIBGFORTRAN (library);
534 append_arg (MATH_LIBRARY);
540 #ifdef ENABLE_SHARED_LIBGCC
545 for (i = 1; i < g77_newargc; i++)
546 if (g77_newargv[i][0] == '-')
547 if (strcmp (g77_newargv[i], "-static-libgcc") == 0
548 || strcmp (g77_newargv[i], "-static") == 0)
551 if (i == g77_newargc)
552 append_arg ("-shared-libgcc");
557 if (verbose && g77_newargv != g77_xargv)
559 fprintf (stderr, _("Driving:"));
560 for (i = 0; i < g77_newargc; i++)
561 fprintf (stderr, " %s", g77_newargv[i]);
562 fprintf (stderr, "\n");
565 *in_argc = g77_newargc;
566 *in_argv = g77_newargv;
570 /* Called before linking. Returns 0 on success and -1 on failure. */
572 lang_specific_pre_link (void) /* Not used for F77. */
577 /* Number of extra output files that lang_specific_pre_link may generate. */
578 int lang_specific_extra_outfiles = 0; /* Not used for F77. */