1 /* Specific flags and argument handling of the Fortran front-end.
2 Copyright (C) 1997, 1999, 2000 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40 This program was originally made out of gcc/cp/g++spec.c, but the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
, "-Xlinker")
198 || ! strcmp (text
, "-specs"))
218 /* Append another argument to the list being built. As long as it is
219 identical to the corresponding arg in the original list, just increment
220 the new arg count. Otherwise allocate a new list, etc. */
226 static int newargsize
;
229 fprintf (stderr
, "`%s'\n", arg
);
232 if (g77_newargv
== g77_xargv
233 && g77_newargc
< g77_xargc
234 && (arg
== g77_xargv
[g77_newargc
]
235 || ! strcmp (arg
, g77_xargv
[g77_newargc
])))
238 return; /* Nothing new here. */
241 if (g77_newargv
== g77_xargv
)
242 { /* Make new arglist. */
245 newargsize
= (g77_xargc
<< 2) + 20; /* This should handle all. */
246 g77_newargv
= (const char **) xmalloc (newargsize
* sizeof (char *));
248 /* Copy what has been done so far. */
249 for (i
= 0; i
< g77_newargc
; ++i
)
250 g77_newargv
[i
] = g77_xargv
[i
];
253 if (g77_newargc
== newargsize
)
254 fatal ("overflowed output arg list for `%s'", arg
);
256 g77_newargv
[g77_newargc
++] = arg
;
260 lang_specific_driver (in_argc
, in_argv
, in_added_libraries
)
262 const char *const **in_argv
;
263 int *in_added_libraries ATTRIBUTE_UNUSED
;
266 const char *const *argv
= *in_argv
;
273 /* This will be NULL if we encounter a situation where we should not
275 const char *library
= FORTRAN_LIBRARY
;
277 /* 0 => -xnone in effect.
278 1 => -xfoo in effect. */
279 int saw_speclang
= 0;
281 /* 0 => initial/reset state
282 1 => last arg was -l<library>
283 2 => last two args were -l<library> -lm. */
286 /* 0 => initial/reset state
287 1 => FORTRAN_INIT linked in */
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");
306 g77_newargv
= (const char **) 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
:
347 /* These options disable linking entirely or linking of the
348 standard libraries. */
369 /* These options are useful in conjunction with -v to get
370 appropriate version info. */
375 GNU Fortran %s (Fortran Frontend version %s)\n\
376 Copyright (C) 2001 Free Software Foundation, Inc.\n\
378 GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
379 You may redistribute copies of GNU Fortran\n\
380 under the terms of the GNU General Public License.\n\
381 For more information about these matters, see the file named COPYING\n\
382 or type the command `info -f g77 Copying'.\n\
383 ", version_string
, ffe_version_string
);
388 /* Let gcc.c handle this, as it has a really
389 cool facility for handling --help and --verbose --help. */
393 fatal ("--driver no longer supported");
400 /* This is the one place we check for missing arguments in the
406 fatal ("argument to `%s' missing", argv
[i
]);
409 if ((n_outfiles
!= 0) && (n_infiles
== 0))
410 fatal ("no input files; unwilling to write output files");
412 /* If there are no input files, no need for the library. */
416 /* Second pass through arglist, transforming arguments as appropriate. */
418 append_arg (argv
[0]); /* Start with command name, of course. */
420 for (i
= 1; i
< argc
; ++i
)
422 if (argv
[i
][0] == '\0')
424 append_arg (argv
[i
]); /* Interesting. Just append as is. */
428 if ((argv
[i
][0] == '-') && (argv
[i
][1] != 'l'))
430 /* Not a filename or library. */
432 if (saw_library
== 1 && need_math
) /* -l<library>. */
433 append_arg (MATH_LIBRARY
);
437 lookup_option (&opt
, &skip
, &arg
, argv
[i
]);
439 if (argv
[i
][1] == '\0')
441 append_arg (argv
[i
]); /* "-" == Standard input. */
447 /* Track input language. */
455 saw_speclang
= (strcmp (lang
, "none") != 0);
458 append_arg (argv
[i
]);
460 for (; skip
!= 0; --skip
)
461 append_arg (argv
[++i
]);
466 /* A filename/library, not an option. */
469 saw_library
= 0; /* -xfoo currently active. */
471 { /* -lfoo or filename. */
472 if (strcmp (argv
[i
], MATH_LIBRARY
) == 0
474 || strcmp (argv
[i
], ALT_LIBM
) == 0
478 if (saw_library
== 1)
479 saw_library
= 2; /* -l<library> -lm. */
484 append_arg (FORTRAN_INIT
);
487 append_arg (FORTRAN_LIBRARY
);
490 else if (strcmp (argv
[i
], FORTRAN_LIBRARY
) == 0)
491 saw_library
= 1; /* -l<library>. */
493 { /* Other library, or filename. */
494 if (saw_library
== 1 && need_math
)
495 append_arg (MATH_LIBRARY
);
499 append_arg (argv
[i
]);
502 /* Append `-lg2c -lm' as necessary. */
505 { /* Doing a link and no -nostdlib. */
507 append_arg ("-xnone");
514 append_arg (FORTRAN_INIT
);
517 append_arg (library
);
520 append_arg (MATH_LIBRARY
);
526 #ifdef ENABLE_SHARED_LIBGCC
531 for (i
= 1; i
< g77_newargc
; i
++)
532 if (g77_newargv
[i
][0] == '-')
533 if (strcmp (g77_newargv
[i
], "-static-libgcc") == 0
534 || strcmp (g77_newargv
[i
], "-static") == 0)
537 if (i
== g77_newargc
)
538 append_arg ("-shared-libgcc");
544 && g77_newargv
!= g77_xargv
)
546 fprintf (stderr
, "Driving:");
547 for (i
= 0; i
< g77_newargc
; i
++)
548 fprintf (stderr
, " %s", g77_newargv
[i
]);
549 fprintf (stderr
, "\n");
552 *in_argc
= g77_newargc
;
553 *in_argv
= g77_newargv
;
556 /* Called before linking. Returns 0 on success and -1 on failure. */
557 int lang_specific_pre_link () /* Not used for F77. */
562 /* Number of extra output files that lang_specific_pre_link may generate. */
563 int lang_specific_extra_outfiles
= 0; /* Not used for F77. */