1 /* Specific flags and argument handling of the Fortran front-end.
2 Copyright (C) 1997, 1999, 2000, 2001, 2002 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40 This program was originally made out of gcc/cp/g++spec.c, but the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
50 #include <f/version.h>
53 #define MATH_LIBRARY "-lm"
57 #define FORTRAN_INIT "-lfrtbegin"
60 #ifndef FORTRAN_LIBRARY
61 #define FORTRAN_LIBRARY "-lg2c"
64 /* Options this driver needs to recognize, not just know how to
68 OPTION_b, /* Aka --prefix. */
69 OPTION_B, /* Aka --target. */
70 OPTION_c, /* Aka --compile. */
71 OPTION_driver, /* Wrapper-specific option. */
72 OPTION_E, /* Aka --preprocess. */
73 OPTION_help, /* --help. */
74 OPTION_i, /* -imacros, -include, -include-*. */
76 OPTION_L, /* Aka --library-directory. */
77 OPTION_M, /* Aka --dependencies. */
78 OPTION_MM, /* Aka --user-dependencies. */
79 OPTION_nostdlib, /* Aka --no-standard-libraries, or
81 OPTION_o, /* Aka --output. */
82 OPTION_S, /* Aka --assemble. */
83 OPTION_syntax_only, /* -fsyntax-only. */
84 OPTION_v, /* Aka --verbose. */
85 OPTION_version, /* --version. */
86 OPTION_V, /* Aka --use-version. */
87 OPTION_x, /* Aka --language. */
88 OPTION_ /* Unrecognized or unimportant. */
91 /* The original argument list and related info is copied here. */
93 static const char *const *g77_xargv;
94 static void lookup_option PARAMS ((Option *, int *, const char **,
96 static void append_arg PARAMS ((const char *));
98 /* The new argument list will be built here. */
99 static int g77_newargc;
100 static const char **g77_newargv;
102 /* --- This comes from gcc.c (2.8.1) verbatim: */
104 /* This defines which switch letters take arguments. */
106 #define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
107 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
108 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
109 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
110 || (CHAR) == 'L' || (CHAR) == 'A')
112 #ifndef SWITCH_TAKES_ARG
113 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
116 /* This defines which multi-letter switches take arguments. */
118 #define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \
119 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \
120 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \
121 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
122 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
123 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
124 || !strcmp (STR, "isystem") || !strcmp (STR, "specs"))
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 (xopt, xskip, xarg, 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 (! strncmp (text, "-fdriver", 8)) /* Really --driver!! */
183 opt = OPTION_driver; /* Never mind arg, this is unsupported. */
184 else if (! strcmp (text, "-fhelp")) /* Really --help!! */
186 else if (! strcmp (text, "-M"))
188 else if (! strcmp (text, "-MM"))
190 else if (! strcmp (text, "-nostdlib")
191 || ! strcmp (text, "-nodefaultlibs"))
192 opt = OPTION_nostdlib;
193 else if (! strcmp (text, "-fsyntax-only"))
194 opt = OPTION_syntax_only;
195 else if (! strcmp (text, "-dumpversion"))
196 opt = OPTION_version;
197 else if (! strcmp (text, "-fversion")) /* Really --version!! */
198 opt = OPTION_version;
199 else if (! strcmp (text, "-Xlinker")
200 || ! strcmp (text, "-specs"))
220 /* Append another argument to the list being built. As long as it is
221 identical to the corresponding arg in the original list, just increment
222 the new arg count. Otherwise allocate a new list, etc. */
228 static int newargsize;
231 fprintf (stderr, "`%s'\n", arg);
234 if (g77_newargv == g77_xargv
235 && g77_newargc < g77_xargc
236 && (arg == g77_xargv[g77_newargc]
237 || ! strcmp (arg, g77_xargv[g77_newargc])))
240 return; /* Nothing new here. */
243 if (g77_newargv == g77_xargv)
244 { /* Make new arglist. */
247 newargsize = (g77_xargc << 2) + 20; /* This should handle all. */
248 g77_newargv = (const char **) xmalloc (newargsize * sizeof (char *));
250 /* Copy what has been done so far. */
251 for (i = 0; i < g77_newargc; ++i)
252 g77_newargv[i] = g77_xargv[i];
255 if (g77_newargc == newargsize)
256 fatal ("overflowed output arg list for `%s'", arg);
258 g77_newargv[g77_newargc++] = arg;
262 lang_specific_driver (in_argc, in_argv, in_added_libraries)
264 const char *const **in_argv;
265 int *in_added_libraries ATTRIBUTE_UNUSED;
268 const char *const *argv = *in_argv;
275 /* This will be NULL if we encounter a situation where we should not
277 const char *library = FORTRAN_LIBRARY;
279 /* 0 => -xnone in effect.
280 1 => -xfoo in effect. */
281 int saw_speclang = 0;
283 /* 0 => initial/reset state
284 1 => last arg was -l<library>
285 2 => last two args were -l<library> -lm. */
288 /* 0 => initial/reset state
289 1 => FORTRAN_INIT linked in */
291 /* By default, we throw on the math library if we have one. */
292 int need_math = (MATH_LIBRARY[0] != '\0');
294 /* The number of input and output files in the incoming arg list. */
299 fprintf (stderr, "Incoming:");
300 for (i = 0; i < argc; i++)
301 fprintf (stderr, " %s", argv[i]);
302 fprintf (stderr, "\n");
308 g77_newargv = (const char **) argv;
310 /* First pass through arglist.
312 If -nostdlib or a "turn-off-linking" option is anywhere in the
313 command line, don't do any library-option processing (except
314 relating to -x). Also, if -v is specified, but no other options
315 that do anything special (allowing -V version, etc.), remember
316 to add special stuff to make gcc command actually invoke all
317 the different phases of the compilation process so all the version
320 Also, here is where all problems with missing arguments to options
321 are caught. If this loop is exited normally, it means all options
322 have the appropriate number of arguments as far as the rest of this
323 program is concerned. */
325 for (i = 1; i < argc; ++i)
327 if ((argv[i][0] == '+') && (argv[i][1] == 'e'))
332 if ((argv[i][0] != '-') || (argv[i][1] == '\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. */
371 /* These options are useful in conjunction with -v to get
372 appropriate version info. */
377 GNU Fortran (GCC %s) %s\n\
378 Copyright (C) 2002 Free Software Foundation, Inc.\n\
380 GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
381 You may redistribute copies of GNU Fortran\n\
382 under the terms of the GNU General Public License.\n\
383 For more information about these matters, see the file named COPYING\n\
384 or type the command `info -f g77 Copying'.\n\
385 ", version_string, ffe_version_string);
390 /* Let gcc.c handle this, as it has a really
391 cool facility for handling --help and --verbose --help. */
395 fatal ("--driver no longer supported");
402 /* This is the one place we check for missing arguments in the
408 fatal ("argument to `%s' missing", argv[i]);
411 if ((n_outfiles != 0) && (n_infiles == 0))
412 fatal ("no input files; unwilling to write output files");
414 /* If there are no input files, no need for the library. */
418 /* Second pass through arglist, transforming arguments as appropriate. */
420 append_arg (argv[0]); /* Start with command name, of course. */
422 for (i = 1; i < argc; ++i)
424 if (argv[i][0] == '\0')
426 append_arg (argv[i]); /* Interesting. Just append as is. */
430 if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
432 /* Not a filename or library. */
434 if (saw_library == 1 && need_math) /* -l<library>. */
435 append_arg (MATH_LIBRARY);
439 lookup_option (&opt, &skip, &arg, argv[i]);
441 if (argv[i][1] == '\0')
443 append_arg (argv[i]); /* "-" == Standard input. */
449 /* Track input language. */
457 saw_speclang = (strcmp (lang, "none") != 0);
460 append_arg (argv[i]);
462 for (; skip != 0; --skip)
463 append_arg (argv[++i]);
468 /* A filename/library, not an option. */
471 saw_library = 0; /* -xfoo currently active. */
473 { /* -lfoo or filename. */
474 if (strcmp (argv[i], MATH_LIBRARY) == 0
476 || strcmp (argv[i], ALT_LIBM) == 0
480 if (saw_library == 1)
481 saw_library = 2; /* -l<library> -lm. */
486 append_arg (FORTRAN_INIT);
489 append_arg (FORTRAN_LIBRARY);
492 else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
493 saw_library = 1; /* -l<library>. */
495 { /* Other library, or filename. */
496 if (saw_library == 1 && need_math)
497 append_arg (MATH_LIBRARY);
501 append_arg (argv[i]);
504 /* Append `-lg2c -lm' as necessary. */
507 { /* Doing a link and no -nostdlib. */
509 append_arg ("-xnone");
516 append_arg (FORTRAN_INIT);
519 append_arg (library);
522 append_arg (MATH_LIBRARY);
528 #ifdef ENABLE_SHARED_LIBGCC
533 for (i = 1; i < g77_newargc; i++)
534 if (g77_newargv[i][0] == '-')
535 if (strcmp (g77_newargv[i], "-static-libgcc") == 0
536 || strcmp (g77_newargv[i], "-static") == 0)
539 if (i == g77_newargc)
540 append_arg ("-shared-libgcc");
546 && g77_newargv != g77_xargv)
548 fprintf (stderr, "Driving:");
549 for (i = 0; i < g77_newargc; i++)
550 fprintf (stderr, " %s", g77_newargv[i]);
551 fprintf (stderr, "\n");
554 *in_argc = g77_newargc;
555 *in_argv = g77_newargv;
558 /* Called before linking. Returns 0 on success and -1 on failure. */
559 int lang_specific_pre_link () /* Not used for F77. */
564 /* Number of extra output files that lang_specific_pre_link may generate. */
565 int lang_specific_extra_outfiles = 0; /* Not used for F77. */