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42 This program was originally made out of gcc/cp/g++spec.c, but the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"
62 #define FORTRAN_INIT "-lgfortranbegin"
65 #ifndef FORTRAN_LIBRARY
66 #define FORTRAN_LIBRARY "-lgfortran"
69 #ifdef HAVE_LD_STATIC_DYNAMIC
70 #define ADD_ARG_LIBGFORTRAN(arg) \
72 if (static_lib && !static_linking) \
73 append_arg ("-Wl,-Bstatic"); \
75 if (static_lib && !static_linking) \
76 append_arg ("-Wl,-Bdynamic"); \
79 #define ADD_ARG_LIBGFORTRAN(arg) append_arg (arg);
83 /* Options this driver needs to recognize, not just know how to
87 OPTION_b, /* Aka --prefix. */
88 OPTION_B, /* Aka --target. */
89 OPTION_c, /* Aka --compile. */
90 OPTION_E, /* Aka --preprocess. */
91 OPTION_help, /* --help. */
92 OPTION_i, /* -imacros, -include, -include-*. */
94 OPTION_L, /* Aka --library-directory. */
95 OPTION_nostdlib, /* Aka --no-standard-libraries, or
97 OPTION_o, /* Aka --output. */
98 OPTION_S, /* Aka --assemble. */
99 OPTION_static, /* -static. */
100 OPTION_static_libgfortran, /* -static-libgfortran. */
101 OPTION_syntax_only, /* -fsyntax-only. */
102 OPTION_v, /* Aka --verbose. */
103 OPTION_version, /* --version. */
104 OPTION_V, /* Aka --use-version. */
105 OPTION_x, /* Aka --language. */
106 OPTION_ /* Unrecognized or unimportant. */
110 /* The original argument list and related info is copied here. */
111 static int g77_xargc;
112 static const char *const *g77_xargv;
113 static void lookup_option (Option *, int *, const char **, const char *);
114 static void append_arg (const char *);
116 /* The new argument list will be built here. */
117 static int g77_newargc;
118 static const char **g77_newargv;
120 /* --- This comes from gcc.c (2.8.1) verbatim: */
122 /* This defines which switch letters take arguments. */
124 #ifndef SWITCH_TAKES_ARG
125 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
128 /* This defines which multi-letter switches take arguments. */
130 #ifndef WORD_SWITCH_TAKES_ARG
131 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
134 /* --- End of verbatim. */
136 /* Assumes text[0] == '-'. Returns number of argv items that belong to
137 (and follow) this one, an option id for options important to the
138 caller, and a pointer to the first char of the arg, if embedded (else
139 returns NULL, meaning no arg or it's the next argv).
141 Note that this also assumes gcc.c's pass converting long options
142 to short ones, where available, has already been run. */
145 lookup_option (Option *xopt, int *xskip, const char **xarg, const char *text)
147 Option opt = OPTION_;
149 const char *arg = NULL;
151 if ((skip = SWITCH_TAKES_ARG (text[1])))
152 skip -= (text[2] != '\0'); /* See gcc.c. */
155 opt = OPTION_B, skip = (text[2] == '\0'), arg = text + 2;
156 else if (text[1] == 'b')
157 opt = OPTION_b, skip = (text[2] == '\0'), arg = text + 2;
158 else if ((text[1] == 'c') && (text[2] == '\0'))
159 opt = OPTION_c, skip = 0;
160 else if ((text[1] == 'E') && (text[2] == '\0'))
161 opt = OPTION_E, skip = 0;
162 else if (text[1] == 'i')
163 opt = OPTION_i, skip = 0;
164 else if (text[1] == 'l')
166 else if (text[1] == 'L')
167 opt = OPTION_L, arg = text + 2;
168 else if (text[1] == 'o')
170 else if ((text[1] == 'S') && (text[2] == '\0'))
171 opt = OPTION_S, skip = 0;
172 else if (text[1] == 'V')
173 opt = OPTION_V, skip = (text[2] == '\0');
174 else if ((text[1] == 'v') && (text[2] == '\0'))
175 opt = OPTION_v, skip = 0;
176 else if (text[1] == 'x')
177 opt = OPTION_x, arg = text + 2;
180 if ((skip = WORD_SWITCH_TAKES_ARG (text + 1)) != 0) /* See gcc.c. */
182 else if (!strcmp (text, "-fhelp")) /* Really --help!! */
184 else if (!strcmp (text, "-nostdlib")
185 || !strcmp (text, "-nodefaultlibs"))
186 opt = OPTION_nostdlib;
187 else if (!strcmp (text, "-fsyntax-only"))
188 opt = OPTION_syntax_only;
189 else if (!strcmp (text, "-static-libgfortran"))
190 opt = OPTION_static_libgfortran;
191 else if (!strcmp (text, "-dumpversion"))
192 opt = OPTION_version;
193 else if (!strcmp (text, "-fversion")) /* Really --version!! */
194 opt = OPTION_version;
195 else if (!strcmp (text, "-Xlinker") || !strcmp (text, "-specs"))
207 if ((arg != NULL) && (arg[0] == '\0'))
214 /* Append another argument to the list being built. As long as it is
215 identical to the corresponding arg in the original list, just increment
216 the new arg count. Otherwise allocate a new list, etc. */
219 append_arg (const char *arg)
221 static int newargsize;
224 fprintf (stderr, "`%s'\n", arg);
227 if (g77_newargv == g77_xargv
228 && g77_newargc < g77_xargc
229 && (arg == g77_xargv[g77_newargc]
230 || !strcmp (arg, g77_xargv[g77_newargc])))
233 return; /* Nothing new here. */
236 if (g77_newargv == g77_xargv)
237 { /* Make new arglist. */
240 newargsize = (g77_xargc << 2) + 20; /* This should handle all. */
241 g77_newargv = (const char **) xmalloc (newargsize * sizeof (char *));
243 /* Copy what has been done so far. */
244 for (i = 0; i < g77_newargc; ++i)
245 g77_newargv[i] = g77_xargv[i];
248 if (g77_newargc == newargsize)
249 fatal ("overflowed output arg list for '%s'", arg);
251 g77_newargv[g77_newargc++] = arg;
255 lang_specific_driver (int *in_argc, const char *const **in_argv,
256 int *in_added_libraries ATTRIBUTE_UNUSED)
259 const char *const *argv = *in_argv;
266 /* This will be NULL if we encounter a situation where we should not
268 const char *library = FORTRAN_LIBRARY;
270 /* 0 => -xnone in effect.
271 1 => -xfoo in effect. */
272 int saw_speclang = 0;
274 /* 0 => initial/reset state
275 1 => last arg was -l<library>
276 2 => last two args were -l<library> -lm. */
279 /* 0 => initial/reset state
280 1 => FORTRAN_INIT linked in */
283 /* By default, we throw on the math library if we have one. */
284 int need_math = (MATH_LIBRARY[0] != '\0');
286 /* Whether we should link a static libgfortran. */
289 /* Whether we need to link statically. */
290 int static_linking = 0;
292 /* The number of input and output files in the incoming arg list. */
297 fprintf (stderr, "Incoming:");
298 for (i = 0; i < argc; i++)
299 fprintf (stderr, " %s", argv[i]);
300 fprintf (stderr, "\n");
306 g77_newargv = CONST_CAST2 (const char **, const char *const *, argv);
308 /* First pass through arglist.
310 If -nostdlib or a "turn-off-linking" option is anywhere in the
311 command line, don't do any library-option processing (except
312 relating to -x). Also, if -v is specified, but no other options
313 that do anything special (allowing -V version, etc.), remember
314 to add special stuff to make gcc command actually invoke all
315 the different phases of the compilation process so all the version
318 Also, here is where all problems with missing arguments to options
319 are caught. If this loop is exited normally, it means all options
320 have the appropriate number of arguments as far as the rest of this
321 program is concerned. */
323 for (i = 1; i < argc; ++i)
325 if ((argv[i][0] == '+') && (argv[i][1] == 'e'))
330 if ((argv[i][0] != '-') || (argv[i][1] == '\0'))
336 lookup_option (&opt, &skip, NULL, argv[i]);
340 case OPTION_nostdlib:
343 case OPTION_syntax_only:
345 /* These options disable linking entirely or linking of the
346 standard libraries. */
350 case OPTION_static_libgfortran:
374 /* These options are useful in conjunction with -v to get
375 appropriate version info. */
379 printf ("GNU Fortran %s%s\n", pkgversion_string, version_string);
380 printf ("Copyright %s 2008 Free Software Foundation, Inc.\n\n",
382 printf (_("GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
383 You may redistribute copies of GNU Fortran\n\
384 under the terms of the GNU General Public License.\n\
385 For more information about these matters, see the file named COPYING\n\n"));
390 /* Let gcc.c handle this, as it has a really
391 cool facility for handling --help and --verbose --help. */
398 /* This is the one place we check for missing arguments in the
404 fatal ("argument to '%s' missing", argv[i]);
407 if ((n_outfiles != 0) && (n_infiles == 0))
408 fatal ("no input files; unwilling to write output files");
410 /* If there are no input files, no need for the library. */
414 /* Second pass through arglist, transforming arguments as appropriate. */
416 append_arg (argv[0]); /* Start with command name, of course. */
418 for (i = 1; i < argc; ++i)
420 if (argv[i][0] == '\0')
422 append_arg (argv[i]); /* Interesting. Just append as is. */
426 if ((argv[i][0] == '-') && (argv[i][1] == 'M'))
430 if (argv[i][2] == '\0')
432 p = XNEWVEC (char, strlen (argv[i + 1]) + 2);
435 strcpy (&p[2], argv[i + 1]);
440 p = XNEWVEC (char, strlen (argv[i]) + 1);
447 if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
449 /* Not a filename or library. */
451 if (saw_library == 1 && need_math) /* -l<library>. */
452 append_arg (MATH_LIBRARY);
456 lookup_option (&opt, &skip, &arg, argv[i]);
458 if (argv[i][1] == '\0')
460 append_arg (argv[i]); /* "-" == Standard input. */
466 /* Track input language. */
474 saw_speclang = (strcmp (lang, "none") != 0);
477 append_arg (argv[i]);
479 for (; skip != 0; --skip)
480 append_arg (argv[++i]);
485 /* A filename/library, not an option. */
488 saw_library = 0; /* -xfoo currently active. */
490 { /* -lfoo or filename. */
491 if (strcmp (argv[i], MATH_LIBRARY) == 0)
493 if (saw_library == 1)
494 saw_library = 2; /* -l<library> -lm. */
499 append_arg (FORTRAN_INIT);
503 ADD_ARG_LIBGFORTRAN (FORTRAN_LIBRARY);
506 else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
508 saw_library = 1; /* -l<library>. */
509 ADD_ARG_LIBGFORTRAN (argv[i]);
513 { /* Other library, or filename. */
514 if (saw_library == 1 && need_math)
515 append_arg (MATH_LIBRARY);
519 append_arg (argv[i]);
522 /* Append `-lg2c -lm' as necessary. */
525 { /* Doing a link and no -nostdlib. */
527 append_arg ("-xnone");
534 append_arg (FORTRAN_INIT);
537 ADD_ARG_LIBGFORTRAN (library);
542 append_arg (MATH_LIBRARY);
548 #ifdef ENABLE_SHARED_LIBGCC
553 for (i = 1; i < g77_newargc; i++)
554 if (g77_newargv[i][0] == '-')
555 if (strcmp (g77_newargv[i], "-static-libgcc") == 0
556 || strcmp (g77_newargv[i], "-static") == 0)
559 if (i == g77_newargc)
560 append_arg ("-shared-libgcc");
565 if (verbose && g77_newargv != g77_xargv)
567 fprintf (stderr, _("Driving:"));
568 for (i = 0; i < g77_newargc; i++)
569 fprintf (stderr, " %s", g77_newargv[i]);
570 fprintf (stderr, "\n");
573 *in_argc = g77_newargc;
574 *in_argv = g77_newargv;
578 /* Called before linking. Returns 0 on success and -1 on failure. */
580 lang_specific_pre_link (void) /* Not used for F77. */
585 /* Number of extra output files that lang_specific_pre_link may generate. */
586 int lang_specific_extra_outfiles = 0; /* Not used for F77. */