1 /* Specific flags and argument handling of the Fortran front-end.
2 Copyright (C) 1997, 1999 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40 This program was originally made out of gcc/cp/g++spec.c, but the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 *version_string;
97 /* --- This comes from gcc.c (2.8.1) verbatim: */
99 /* This defines which switch letters take arguments. */
101 #define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
102 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
103 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
104 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
105 || (CHAR) == 'L' || (CHAR) == 'A')
107 #ifndef SWITCH_TAKES_ARG
108 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
111 /* This defines which multi-letter switches take arguments. */
113 #define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \
114 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \
115 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \
116 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
117 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
118 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
119 || !strcmp (STR, "isystem") || !strcmp (STR, "specs"))
121 #ifndef WORD_SWITCH_TAKES_ARG
122 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
125 /* --- End of verbatim. */
127 /* Assumes text[0] == '-'. Returns number of argv items that belong to
128 (and follow) this one, an option id for options important to the
129 caller, and a pointer to the first char of the arg, if embedded (else
130 returns NULL, meaning no arg or it's the next argv).
132 Note that this also assumes gcc.c's pass converting long options
133 to short ones, where available, has already been run. */
136 lookup_option (xopt, xskip, xarg, text)
142 Option opt = OPTION_;
146 if ((skip = SWITCH_TAKES_ARG (text[1])))
147 skip -= (text[2] != '\0'); /* See gcc.c. */
150 opt = OPTION_B, skip = (text[2] == '\0'), arg = text + 2;
151 else if (text[1] == 'b')
152 opt = OPTION_b, skip = (text[2] == '\0'), arg = text + 2;
153 else if ((text[1] == 'c') && (text[2] == '\0'))
154 opt = OPTION_c, skip = 0;
155 else if ((text[1] == 'E') && (text[2] == '\0'))
156 opt = OPTION_E, skip = 0;
157 else if (text[1] == 'i')
158 opt = OPTION_i, skip = 0;
159 else if (text[1] == 'l')
161 else if (text[1] == 'L')
162 opt = OPTION_L, arg = text + 2;
163 else if (text[1] == 'o')
165 else if ((text[1] == 'S') && (text[2] == '\0'))
166 opt = OPTION_S, skip = 0;
167 else if (text[1] == 'V')
168 opt = OPTION_V, skip = (text[2] == '\0');
169 else if ((text[1] == 'v') && (text[2] == '\0'))
170 opt = OPTION_v, skip = 0;
171 else if (text[1] == 'x')
172 opt = OPTION_x, arg = text + 2;
175 if ((skip = WORD_SWITCH_TAKES_ARG (text + 1)) != 0) /* See gcc.c. */
177 else if (! strncmp (text, "-fdriver", 8)) /* Really --driver!! */
178 opt = OPTION_driver; /* Never mind arg, this is unsupported. */
179 else if (! strcmp (text, "-fhelp")) /* Really --help!! */
181 else if (! strcmp (text, "-M"))
183 else if (! strcmp (text, "-MM"))
185 else if (! strcmp (text, "-nostdlib")
186 || ! strcmp (text, "-nodefaultlibs"))
187 opt = OPTION_nostdlib;
188 else if (! strcmp (text, "-fsyntax-only"))
189 opt = OPTION_syntax_only;
190 else if (! strcmp (text, "-dumpversion"))
191 opt = OPTION_version;
192 else if (! strcmp (text, "-Xlinker")
193 || ! strcmp (text, "-specs"))
213 /* Append another argument to the list being built. As long as it is
214 identical to the corresponding arg in the original list, just increment
215 the new arg count. Otherwise allocate a new list, etc. */
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 = (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 (*g77_fn) ("overflowed output arg list for `%s'", arg);
251 g77_newargv[g77_newargc++] = arg;
255 lang_specific_driver (fn, in_argc, in_argv, in_added_libraries)
259 int *in_added_libraries;
262 char **argv = *in_argv;
269 /* This will be NULL if we encounter a situation where we should not
271 char *library = FORTRAN_LIBRARY;
273 /* This will become 0 if anything other than -v and kin (like -V)
274 is seen, meaning the user is trying to accomplish something.
275 If it remains nonzero, and the user wants version info, add stuff to
276 the command line to make gcc invoke all the appropriate phases
277 to get all the version info. */
278 int add_version_magic = 1;
280 /* 0 => -xnone in effect.
281 1 => -xfoo in effect. */
282 int saw_speclang = 0;
284 /* 0 => initial/reset state
285 1 => last arg was -l<library>
286 2 => last two args were -l<library> -lm. */
289 /* By default, we throw on the math library if we have one. */
290 int need_math = (MATH_LIBRARY[0] != '\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");
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);
400 /* Let gcc.c handle this, as the egcs version has a really
401 cool facility for handling --help and --verbose --help. */
406 Usage: g77 [OPTION]... FORTRAN-SOURCE...\n\
408 Compile and link Fortran source code to produce an executable program,\n\
409 which by default is named `a.out', and can be invoked with the UNIX\n\
410 command `./a.out'.\n\
413 --debug include debugging information in executable.\n\
414 --help display this help and exit.\n\
415 --optimize[=LEVEL] take extra time and memory to make generated\n\
416 executable run faster. LEVEL is 0 for no\n\
417 optimization, 1 for normal optimization, and\n\
418 increases through 3 for more optimization.\n\
419 --output=PROGRAM name the executable PROGRAM instead of a.out;\n\
420 invoke with the command `./PROGRAM'.\n\
421 --version display version information and exit.\n\
423 Many other options exist to tailor the compilation process, specify\n\
424 the dialect of the Fortran source code, specify details of the\n\
425 code-generation methodology, and so on.\n\
427 For more information on g77 and gcc, type the commands `info -f g77'\n\
428 and `info -f gcc' to read the Info documentation.\n\
430 For bug reporting instructions, please see:\n\
431 <URL:http://www.gnu.org/software/gcc/faq.html#bugreport>.\n");
437 (*fn) ("--driver no longer supported", argv[i]);
441 add_version_magic = 0;
445 /* This is the one place we check for missing arguments in the
451 (*fn) ("argument to `%s' missing", argv[i]);
454 if ((n_outfiles != 0) && (n_infiles == 0))
455 (*fn) ("No input files; unwilling to write output files");
457 /* Second pass through arglist, transforming arguments as appropriate. */
459 append_arg (argv[0]); /* Start with command name, of course. */
461 for (i = 1; i < argc; ++i)
463 if (argv[i][0] == '\0')
465 append_arg (argv[i]); /* Interesting. Just append as is. */
469 if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
471 /* Not a filename or library. */
473 if (saw_library == 1 && need_math) /* -l<library>. */
474 append_arg (MATH_LIBRARY);
478 lookup_option (&opt, &skip, &arg, argv[i]);
480 if (argv[i][1] == '\0')
482 append_arg (argv[i]); /* "-" == Standard input. */
488 /* Track input language. */
496 saw_speclang = (strcmp (lang, "none") != 0);
499 append_arg (argv[i]);
501 for (; skip != 0; --skip)
502 append_arg (argv[++i]);
507 /* A filename/library, not an option. */
510 saw_library = 0; /* -xfoo currently active. */
512 { /* -lfoo or filename. */
513 if (strcmp (argv[i], MATH_LIBRARY) == 0
515 || strcmp (argv[i], ALT_LIBM) == 0
519 if (saw_library == 1)
520 saw_library = 2; /* -l<library> -lm. */
522 append_arg (FORTRAN_LIBRARY);
524 else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
525 saw_library = 1; /* -l<library>. */
527 { /* Other library, or filename. */
528 if (saw_library == 1 && need_math)
529 append_arg (MATH_LIBRARY);
533 append_arg (argv[i]);
536 /* Append `-lg2c -lm' as necessary. */
538 if (! add_version_magic && library)
539 { /* Doing a link and no -nostdlib. */
541 append_arg ("-xnone");
546 append_arg (library);
549 append_arg (MATH_LIBRARY);
554 else if (add_version_magic && verbose)
557 append_arg ("-xf77-version");
558 append_arg ("/dev/null");
559 append_arg ("-xnone");
563 && g77_newargv != g77_xargv)
565 fprintf (stderr, "Driving:");
566 for (i = 0; i < g77_newargc; i++)
567 fprintf (stderr, " %s", g77_newargv[i]);
568 fprintf (stderr, "\n");
571 *in_argc = g77_newargc;
572 *in_argv = g77_newargv;
575 /* Called before linking. Returns 0 on success and -1 on failure. */
576 int lang_specific_pre_link () /* Not used for F77. */
581 /* Number of extra output files that lang_specific_pre_link may generate. */
582 int lang_specific_extra_outfiles = 0; /* Not used for F77. */