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40 This program was originally made out of gcc/cp/g++spec.c, but the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 "gansidecl.h"
50 #include <f/version.h>
53 #define MATH_LIBRARY "-lm"
56 #ifndef FORTRAN_LIBRARY
57 #define FORTRAN_LIBRARY "-lg2c"
60 /* Options this driver needs to recognize, not just know how to
64 OPTION_b, /* Aka --prefix. */
65 OPTION_B, /* Aka --target. */
66 OPTION_c, /* Aka --compile. */
67 OPTION_driver, /* Wrapper-specific option. */
68 OPTION_E, /* Aka --preprocess. */
69 OPTION_help, /* --help. */
70 OPTION_i, /* -imacros, -include, -include-*. */
72 OPTION_L, /* Aka --library-directory. */
73 OPTION_M, /* Aka --dependencies. */
74 OPTION_MM, /* Aka --user-dependencies. */
75 OPTION_nostdlib, /* Aka --no-standard-libraries, or
77 OPTION_o, /* Aka --output. */
78 OPTION_S, /* Aka --assemble. */
79 OPTION_syntax_only, /* -fsyntax-only. */
80 OPTION_v, /* Aka --verbose. */
81 OPTION_version, /* --version. */
82 OPTION_V, /* Aka --use-version. */
83 OPTION_x, /* Aka --language. */
84 OPTION_ /* Unrecognized or unimportant. */
87 /* The original argument list and related info is copied here. */
89 static char **g77_xargv;
90 static void (*g77_fn)();
92 /* The new argument list will be built here. */
93 static int g77_newargc;
94 static char **g77_newargv;
96 extern char *xmalloc PROTO((size_t));
98 extern char *version_string;
100 /* --- This comes from gcc.c (2.8.1) verbatim: */
102 /* This defines which switch letters take arguments. */
104 #define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
105 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
106 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
107 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
108 || (CHAR) == 'L' || (CHAR) == 'A')
110 #ifndef SWITCH_TAKES_ARG
111 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
114 /* This defines which multi-letter switches take arguments. */
116 #define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \
117 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \
118 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \
119 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
120 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
121 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
122 || !strcmp (STR, "isystem") || !strcmp (STR, "specs"))
124 #ifndef WORD_SWITCH_TAKES_ARG
125 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
128 /* --- End of verbatim. */
130 /* Assumes text[0] == '-'. Returns number of argv items that belong to
131 (and follow) this one, an option id for options important to the
132 caller, and a pointer to the first char of the arg, if embedded (else
133 returns NULL, meaning no arg or it's the next argv).
135 Note that this also assumes gcc.c's pass converting long options
136 to short ones, where available, has already been run. */
139 lookup_option (xopt, xskip, xarg, text)
145 Option opt = OPTION_;
149 if ((skip = SWITCH_TAKES_ARG (text[1])))
150 skip -= (text[2] != '\0'); /* See gcc.c. */
153 opt = OPTION_B, skip = (text[2] == '\0'), arg = text + 2;
154 else if (text[1] == 'b')
155 opt = OPTION_b, skip = (text[2] == '\0'), arg = text + 2;
156 else if ((text[1] == 'c') && (text[2] == '\0'))
157 opt = OPTION_c, skip = 0;
158 else if ((text[1] == 'E') && (text[2] == '\0'))
159 opt = OPTION_E, skip = 0;
160 else if (text[1] == 'i')
161 opt = OPTION_i, skip = 0;
162 else if (text[1] == 'l')
164 else if (text[1] == 'L')
165 opt = OPTION_L, arg = text + 2;
166 else if (text[1] == 'o')
168 else if ((text[1] == 'S') && (text[2] == '\0'))
169 opt = OPTION_S, skip = 0;
170 else if (text[1] == 'V')
171 opt = OPTION_V, skip = (text[2] == '\0');
172 else if ((text[1] == 'v') && (text[2] == '\0'))
173 opt = OPTION_v, skip = 0;
174 else if (text[1] == 'x')
175 opt = OPTION_x, arg = text + 2;
178 if ((skip = WORD_SWITCH_TAKES_ARG (text + 1)) != 0) /* See gcc.c. */
180 else if (! strncmp (text, "-fdriver", 8)) /* Really --driver!! */
181 opt = OPTION_driver; /* Never mind arg, this is unsupported. */
182 else if (! strcmp (text, "-fhelp")) /* Really --help!! */
184 else if (! strcmp (text, "-M"))
186 else if (! strcmp (text, "-MM"))
188 else if (! strcmp (text, "-nostdlib")
189 || ! strcmp (text, "-nodefaultlibs"))
190 opt = OPTION_nostdlib;
191 else if (! strcmp (text, "-fsyntax-only"))
192 opt = OPTION_syntax_only;
193 else if (! strcmp (text, "-dumpversion"))
194 opt = OPTION_version;
195 else if (! strcmp (text, "-Xlinker")
196 || ! strcmp (text, "-specs"))
216 /* Append another argument to the list being built. As long as it is
217 identical to the corresponding arg in the original list, just increment
218 the new arg count. Otherwise allocate a new list, etc. */
224 static int newargsize;
227 fprintf (stderr, "`%s'\n", arg);
230 if (g77_newargv == g77_xargv
231 && g77_newargc < g77_xargc
232 && (arg == g77_xargv[g77_newargc]
233 || ! strcmp (arg, g77_xargv[g77_newargc])))
236 return; /* Nothing new here. */
239 if (g77_newargv == g77_xargv)
240 { /* Make new arglist. */
243 newargsize = (g77_xargc << 2) + 20; /* This should handle all. */
244 g77_newargv = (char **) xmalloc (newargsize * sizeof (char *));
246 /* Copy what has been done so far. */
247 for (i = 0; i < g77_newargc; ++i)
248 g77_newargv[i] = g77_xargv[i];
251 if (g77_newargc == newargsize)
252 (*g77_fn) ("overflowed output arg list for `%s'", arg);
254 g77_newargv[g77_newargc++] = arg;
258 lang_specific_driver (fn, in_argc, in_argv, in_added_libraries)
262 int *in_added_libraries;
265 char **argv = *in_argv;
272 /* This will be NULL if we encounter a situation where we should not
274 char *library = FORTRAN_LIBRARY;
276 /* This will become 0 if anything other than -v and kin (like -V)
277 is seen, meaning the user is trying to accomplish something.
278 If it remains nonzero, and the user wants version info, add stuff to
279 the command line to make gcc invoke all the appropriate phases
280 to get all the version info. */
281 int add_version_magic = 1;
283 /* 0 => -xnone in effect.
284 1 => -xfoo in effect. */
285 int saw_speclang = 0;
287 /* 0 => initial/reset state
288 1 => last arg was -l<library>
289 2 => last two args were -l<library> -lm. */
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");
309 /* First pass through arglist.
311 If -nostdlib or a "turn-off-linking" option is anywhere in the
312 command line, don't do any library-option processing (except
313 relating to -x). Also, if -v is specified, but no other options
314 that do anything special (allowing -V version, etc.), remember
315 to add special stuff to make gcc command actually invoke all
316 the different phases of the compilation process so all the version
319 Also, here is where all problems with missing arguments to options
320 are caught. If this loop is exited normally, it means all options
321 have the appropriate number of arguments as far as the rest of this
322 program is concerned. */
324 for (i = 1; i < argc; ++i)
326 if ((argv[i][0] == '+') && (argv[i][1] == 'e'))
328 add_version_magic = 0;
332 if ((argv[i][0] != '-') || (argv[i][1] == '\0'))
335 add_version_magic = 0;
339 lookup_option (&opt, &skip, NULL, argv[i]);
343 case OPTION_nostdlib:
346 case OPTION_syntax_only:
350 /* These options disable linking entirely or linking of the
351 standard libraries. */
353 add_version_magic = 0;
358 add_version_magic = 0;
363 add_version_magic = 0;
368 fprintf (stderr, "g77 version %s (from FSF-g77 version %s)\n",
369 version_string, ffe_version_string);
378 /* These options are useful in conjunction with -v to get
379 appropriate version info. */
385 Copyright (C) 1997 Free Software Foundation, Inc.\n\
386 For more version information on components of the GNU Fortran\n\
387 compilation system, especially useful when reporting bugs,\n\
388 type the command `g77 --verbose'.\n\
390 GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
391 You may redistribute copies of GNU Fortran\n\
392 under the terms of the GNU General Public License.\n\
393 For more information about these matters, see the file named COPYING\n\
394 or type the command `info -f g77 Copying'.\n\
395 ", ffe_version_string);
401 Usage: g77 [OPTION]... FORTRAN-SOURCE...\n\
403 Compile and link Fortran source code to produce an executable program,\n\
404 which by default is named `a.out', and can be invoked with the UNIX\n\
405 command `./a.out'.\n\
408 --debug include debugging information in executable.\n\
409 --help display this help and exit.\n\
410 --optimize[=LEVEL] take extra time and memory to make generated\n\
411 executable run faster. LEVEL is 0 for no\n\
412 optimization, 1 for normal optimization, and\n\
413 increases through 3 for more optimization.\n\
414 --output=PROGRAM name the executable PROGRAM instead of a.out;\n\
415 invoke with the command `./PROGRAM'.\n\
416 --version display version information and exit.\n\
418 Many other options exist to tailor the compilation process, specify\n\
419 the dialect of the Fortran source code, specify details of the\n\
420 code-generation methodology, and so on.\n\
422 For more information on g77 and gcc, type the commands `info -f g77'\n\
423 and `info -f gcc' to read the Info documentation.\n\
425 Report bugs to <egcs-bugs@cygnus.org>.\n");
430 (*fn) ("--driver no longer supported", argv[i]);
434 add_version_magic = 0;
438 /* This is the one place we check for missing arguments in the
444 (*fn) ("argument to `%s' missing", argv[i]);
447 if ((n_outfiles != 0) && (n_infiles == 0))
448 (*fn) ("No input files; unwilling to write output files");
450 /* Second pass through arglist, transforming arguments as appropriate. */
452 append_arg (argv[0]); /* Start with command name, of course. */
454 for (i = 1; i < argc; ++i)
456 if (argv[i][0] == '\0')
458 append_arg (argv[i]); /* Interesting. Just append as is. */
462 if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
464 /* Not a filename or library. */
466 if (saw_library == 1) /* -l<library>. */
467 append_arg (MATH_LIBRARY);
471 lookup_option (&opt, &skip, &arg, argv[i]);
473 if (argv[i][1] == '\0')
475 append_arg (argv[i]); /* "-" == Standard input. */
481 /* Track input language. */
489 saw_speclang = (strcmp (lang, "none") != 0);
492 append_arg (argv[i]);
494 for (; skip != 0; --skip)
495 append_arg (argv[++i]);
500 /* A filename/library, not an option. */
503 saw_library = 0; /* -xfoo currently active. */
505 { /* -lfoo or filename. */
506 if (strcmp (argv[i], MATH_LIBRARY) == 0
508 || strcmp (argv[i], ALT_LIBM) == 0
512 if (saw_library == 1)
513 saw_library = 2; /* -l<library> -lm. */
515 append_arg (FORTRAN_LIBRARY);
517 else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
518 saw_library = 1; /* -l<library>. */
520 { /* Other library, or filename. */
521 if (saw_library == 1)
522 append_arg (MATH_LIBRARY);
526 append_arg (argv[i]);
529 /* Append `-lg2c -lm' as necessary. */
531 if (! add_version_magic && library)
532 { /* Doing a link and no -nostdlib. */
534 append_arg ("-xnone");
539 append_arg (library);
541 append_arg (MATH_LIBRARY);
546 else if (add_version_magic && verbose)
549 append_arg ("-xf77-version");
550 append_arg ("/dev/null");
551 append_arg ("-xnone");
555 && g77_newargv != g77_xargv)
557 fprintf (stderr, "Driving:");
558 for (i = 0; i < g77_newargc; i++)
559 fprintf (stderr, " %s", g77_newargv[i]);
560 fprintf (stderr, "\n");
563 *in_argc = g77_newargc;
564 *in_argv = g77_newargv;
567 /* Called before linking. Returns 0 on success and -1 on failure. */
568 int lang_specific_pre_link () /* Not used for F77. */
573 /* Number of extra output files that lang_specific_pre_link may generate. */
574 int lang_specific_extra_outfiles = 0; /* Not used for F77. */