1 /* Specific flags and argument handling of the Fortran front-end.
2 Copyright (C) 1997 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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 2, or (at your option)
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.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* This file contains a filter for the main `gcc' driver, which is
22 replicated for the `g77' 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.
28 For GNU Fortran (g77), we do the following to the argument list
29 before passing it to `gcc':
31 1. Make sure `-lg2c -lm' is at the end of the list.
33 2. Make sure each time `-lg2c' or `-lm' is seen, it forms
34 part of the series `-lg2c -lm'.
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.
40 This program was originally made out of gcc/cp/g++spec.c, but the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
49 #include <f/version.h>
52 #define MATH_LIBRARY "-lm"
55 #ifndef FORTRAN_LIBRARY
56 #define FORTRAN_LIBRARY "-lg2c"
59 /* Options this driver needs to recognize, not just know how to
63 OPTION_b, /* Aka --prefix. */
64 OPTION_B, /* Aka --target. */
65 OPTION_c, /* Aka --compile. */
66 OPTION_driver, /* Wrapper-specific option. */
67 OPTION_E, /* Aka --preprocess. */
68 OPTION_help, /* --help. */
69 OPTION_i, /* -imacros, -include, -include-*. */
71 OPTION_L, /* Aka --library-directory. */
72 OPTION_M, /* Aka --dependencies. */
73 OPTION_MM, /* Aka --user-dependencies. */
74 OPTION_nostdlib, /* Aka --no-standard-libraries, or
76 OPTION_o, /* Aka --output. */
77 OPTION_S, /* Aka --assemble. */
78 OPTION_syntax_only, /* -fsyntax-only. */
79 OPTION_v, /* Aka --verbose. */
80 OPTION_version, /* --version. */
81 OPTION_V, /* Aka --use-version. */
82 OPTION_x, /* Aka --language. */
83 OPTION_ /* Unrecognized or unimportant. */
86 /* The original argument list and related info is copied here. */
88 static char **g77_xargv;
89 static void (*g77_fn)();
91 /* The new argument list will be built here. */
92 static int g77_newargc;
93 static char **g77_newargv;
95 extern char *xmalloc PROTO((size_t));
97 extern char *version_string;
99 /* --- This comes from gcc.c (2.8.1) verbatim: */
101 /* This defines which switch letters take arguments. */
103 #define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
104 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
105 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
106 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
107 || (CHAR) == 'L' || (CHAR) == 'A')
109 #ifndef SWITCH_TAKES_ARG
110 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
113 /* This defines which multi-letter switches take arguments. */
115 #define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \
116 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \
117 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \
118 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
119 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
120 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
121 || !strcmp (STR, "isystem") || !strcmp (STR, "specs"))
123 #ifndef WORD_SWITCH_TAKES_ARG
124 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
127 /* --- End of verbatim. */
129 /* Assumes text[0] == '-'. Returns number of argv items that belong to
130 (and follow) this one, an option id for options important to the
131 caller, and a pointer to the first char of the arg, if embedded (else
132 returns NULL, meaning no arg or it's the next argv).
134 Note that this also assumes gcc.c's pass converting long options
135 to short ones, where available, has already been run. */
138 lookup_option (xopt, xskip, xarg, text)
144 Option opt = OPTION_;
148 if ((skip = SWITCH_TAKES_ARG (text[1])))
149 skip -= (text[2] != '\0'); /* See gcc.c. */
152 opt = OPTION_B, skip = (text[2] == '\0'), arg = text + 2;
153 else if (text[1] == 'b')
154 opt = OPTION_b, skip = (text[2] == '\0'), arg = text + 2;
155 else if ((text[1] == 'c') && (text[2] == '\0'))
156 opt = OPTION_c, skip = 0;
157 else if ((text[1] == 'E') && (text[2] == '\0'))
158 opt = OPTION_E, skip = 0;
159 else if (text[1] == 'i')
160 opt = OPTION_i, skip = 0;
161 else if (text[1] == 'l')
163 else if (text[1] == 'L')
164 opt = OPTION_L, arg = text + 2;
165 else if (text[1] == 'o')
167 else if ((text[1] == 'S') && (text[2] == '\0'))
168 opt = OPTION_S, skip = 0;
169 else if (text[1] == 'V')
170 opt = OPTION_V, skip = (text[2] == '\0');
171 else if ((text[1] == 'v') && (text[2] == '\0'))
172 opt = OPTION_v, skip = 0;
173 else if (text[1] == 'x')
174 opt = OPTION_x, arg = text + 2;
177 if ((skip = WORD_SWITCH_TAKES_ARG (text + 1)) != 0) /* See gcc.c. */
179 else if (! strncmp (text, "-fdriver", 8)) /* Really --driver!! */
180 opt = OPTION_driver; /* Never mind arg, this is unsupported. */
181 else if (! strcmp (text, "-fhelp")) /* Really --help!! */
183 else if (! strcmp (text, "-M"))
185 else if (! strcmp (text, "-MM"))
187 else if (! strcmp (text, "-nostdlib")
188 || ! strcmp (text, "-nodefaultlibs"))
189 opt = OPTION_nostdlib;
190 else if (! strcmp (text, "-fsyntax-only"))
191 opt = OPTION_syntax_only;
192 else if (! strcmp (text, "-dumpversion"))
193 opt = OPTION_version;
194 else if (! strcmp (text, "-Xlinker")
195 || ! strcmp (text, "-specs"))
215 /* Append another argument to the list being built. As long as it is
216 identical to the corresponding arg in the original list, just increment
217 the new arg count. Otherwise allocate a new list, etc. */
223 static int newargsize;
226 fprintf (stderr, "`%s'\n", arg);
229 if (g77_newargv == g77_xargv
230 && g77_newargc < g77_xargc
231 && (arg == g77_xargv[g77_newargc]
232 || ! strcmp (arg, g77_xargv[g77_newargc])))
235 return; /* Nothing new here. */
238 if (g77_newargv == g77_xargv)
239 { /* Make new arglist. */
242 newargsize = (g77_xargc << 2) + 20; /* This should handle all. */
243 g77_newargv = (char **) xmalloc (newargsize * sizeof (char *));
245 /* Copy what has been done so far. */
246 for (i = 0; i < g77_newargc; ++i)
247 g77_newargv[i] = g77_xargv[i];
250 if (g77_newargc == newargsize)
251 (*g77_fn) ("overflowed output arg list for `%s'", arg);
253 g77_newargv[g77_newargc++] = arg;
257 lang_specific_driver (fn, in_argc, in_argv, in_added_libraries)
261 int *in_added_libraries;
264 char **argv = *in_argv;
271 /* This will be NULL if we encounter a situation where we should not
273 char *library = FORTRAN_LIBRARY;
275 /* This will become 0 if anything other than -v and kin (like -V)
276 is seen, meaning the user is trying to accomplish something.
277 If it remains nonzero, and the user wants version info, add stuff to
278 the command line to make gcc invoke all the appropriate phases
279 to get all the version info. */
280 int add_version_magic = 1;
282 /* 0 => -xnone in effect.
283 1 => -xfoo in effect. */
284 int saw_speclang = 0;
286 /* 0 => initial/reset state
287 1 => last arg was -l<library>
288 2 => last two args were -l<library> -lm. */
291 /* The number of input and output files in the incoming arg list. */
296 fprintf (stderr, "Incoming:");
297 for (i = 0; i < argc; i++)
298 fprintf (stderr, " %s", argv[i]);
299 fprintf (stderr, "\n");
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'))
327 add_version_magic = 0;
331 if ((argv[i][0] != '-') || (argv[i][1] == '\0'))
334 add_version_magic = 0;
338 lookup_option (&opt, &skip, NULL, argv[i]);
342 case OPTION_nostdlib:
345 case OPTION_syntax_only:
349 /* These options disable linking entirely or linking of the
350 standard libraries. */
352 add_version_magic = 0;
357 add_version_magic = 0;
362 add_version_magic = 0;
367 fprintf (stderr, "g77 version %s (from FSF-g77 version %s)\n",
368 version_string, ffe_version_string);
377 /* These options are useful in conjunction with -v to get
378 appropriate version info. */
384 Copyright (C) 1997 Free Software Foundation, Inc.\n\
385 For more version information on components of the GNU Fortran\n\
386 compilation system, especially useful when reporting bugs,\n\
387 type the command `g77 --verbose'.\n\
389 GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
390 You may redistribute copies of GNU Fortran\n\
391 under the terms of the GNU General Public License.\n\
392 For more information about these matters, see the file named COPYING\n\
393 or type the command `info -f g77 Copying'.\n\
394 ", ffe_version_string);
399 /* Let gcc.c handle this, as the egcs version has a really
400 cool facility for handling --help and --verbose --help. */
405 Usage: g77 [OPTION]... FORTRAN-SOURCE...\n\
407 Compile and link Fortran source code to produce an executable program,\n\
408 which by default is named `a.out', and can be invoked with the UNIX\n\
409 command `./a.out'.\n\
412 --debug include debugging information in executable.\n\
413 --help display this help and exit.\n\
414 --optimize[=LEVEL] take extra time and memory to make generated\n\
415 executable run faster. LEVEL is 0 for no\n\
416 optimization, 1 for normal optimization, and\n\
417 increases through 3 for more optimization.\n\
418 --output=PROGRAM name the executable PROGRAM instead of a.out;\n\
419 invoke with the command `./PROGRAM'.\n\
420 --version display version information and exit.\n\
422 Many other options exist to tailor the compilation process, specify\n\
423 the dialect of the Fortran source code, specify details of the\n\
424 code-generation methodology, and so on.\n\
426 For more information on g77 and gcc, type the commands `info -f g77'\n\
427 and `info -f gcc' to read the Info documentation.\n\
429 Report bugs to <egcs-bugs@cygnus.org>.\n");
435 (*fn) ("--driver no longer supported", argv[i]);
439 add_version_magic = 0;
443 /* This is the one place we check for missing arguments in the
449 (*fn) ("argument to `%s' missing", argv[i]);
452 if ((n_outfiles != 0) && (n_infiles == 0))
453 (*fn) ("No input files; unwilling to write output files");
455 /* Second pass through arglist, transforming arguments as appropriate. */
457 append_arg (argv[0]); /* Start with command name, of course. */
459 for (i = 1; i < argc; ++i)
461 if (argv[i][0] == '\0')
463 append_arg (argv[i]); /* Interesting. Just append as is. */
467 if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
469 /* Not a filename or library. */
471 if (saw_library == 1) /* -l<library>. */
472 append_arg (MATH_LIBRARY);
476 lookup_option (&opt, &skip, &arg, argv[i]);
478 if (argv[i][1] == '\0')
480 append_arg (argv[i]); /* "-" == Standard input. */
486 /* Track input language. */
494 saw_speclang = (strcmp (lang, "none") != 0);
497 append_arg (argv[i]);
499 for (; skip != 0; --skip)
500 append_arg (argv[++i]);
505 /* A filename/library, not an option. */
508 saw_library = 0; /* -xfoo currently active. */
510 { /* -lfoo or filename. */
511 if (strcmp (argv[i], MATH_LIBRARY) == 0
513 || strcmp (argv[i], ALT_LIBM) == 0
517 if (saw_library == 1)
518 saw_library = 2; /* -l<library> -lm. */
520 append_arg (FORTRAN_LIBRARY);
522 else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
523 saw_library = 1; /* -l<library>. */
525 { /* Other library, or filename. */
526 if (saw_library == 1)
527 append_arg (MATH_LIBRARY);
531 append_arg (argv[i]);
534 /* Append `-lg2c -lm' as necessary. */
536 if (! add_version_magic && library)
537 { /* Doing a link and no -nostdlib. */
539 append_arg ("-xnone");
544 append_arg (library);
546 append_arg (MATH_LIBRARY);
551 else if (add_version_magic && verbose)
554 append_arg ("-xf77-version");
555 append_arg ("/dev/null");
556 append_arg ("-xnone");
560 && g77_newargv != g77_xargv)
562 fprintf (stderr, "Driving:");
563 for (i = 0; i < g77_newargc; i++)
564 fprintf (stderr, " %s", g77_newargv[i]);
565 fprintf (stderr, "\n");
568 *in_argc = g77_newargc;
569 *in_argv = g77_newargv;
572 /* Called before linking. Returns 0 on success and -1 on failure. */
573 int lang_specific_pre_link () /* Not used for F77. */
578 /* Number of extra output files that lang_specific_pre_link may generate. */
579 int lang_specific_extra_outfiles = 0; /* Not used for F77. */