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40 This program was originally made out of gcc/cp/g++spec.c, but the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"
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 const char *const *g77_xargv
;
90 static void lookup_option
PARAMS ((Option
*, int *, const char **,
92 static void append_arg
PARAMS ((const char *));
94 /* The new argument list will be built here. */
95 static int g77_newargc
;
96 static const char **g77_newargv
;
98 /* --- This comes from gcc.c (2.8.1) verbatim: */
100 /* This defines which switch letters take arguments. */
102 #define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
103 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
104 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
105 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
106 || (CHAR) == 'L' || (CHAR) == 'A')
108 #ifndef SWITCH_TAKES_ARG
109 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
112 /* This defines which multi-letter switches take arguments. */
114 #define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \
115 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \
116 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \
117 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
118 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
119 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
120 || !strcmp (STR, "isystem") || !strcmp (STR, "specs"))
122 #ifndef WORD_SWITCH_TAKES_ARG
123 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
126 /* --- End of verbatim. */
128 /* Assumes text[0] == '-'. Returns number of argv items that belong to
129 (and follow) this one, an option id for options important to the
130 caller, and a pointer to the first char of the arg, if embedded (else
131 returns NULL, meaning no arg or it's the next argv).
133 Note that this also assumes gcc.c's pass converting long options
134 to short ones, where available, has already been run. */
137 lookup_option (xopt
, xskip
, xarg
, text
)
143 Option opt
= OPTION_
;
145 const char *arg
= NULL
;
147 if ((skip
= SWITCH_TAKES_ARG (text
[1])))
148 skip
-= (text
[2] != '\0'); /* See gcc.c. */
151 opt
= OPTION_B
, skip
= (text
[2] == '\0'), arg
= text
+ 2;
152 else if (text
[1] == 'b')
153 opt
= OPTION_b
, skip
= (text
[2] == '\0'), arg
= text
+ 2;
154 else if ((text
[1] == 'c') && (text
[2] == '\0'))
155 opt
= OPTION_c
, skip
= 0;
156 else if ((text
[1] == 'E') && (text
[2] == '\0'))
157 opt
= OPTION_E
, skip
= 0;
158 else if (text
[1] == 'i')
159 opt
= OPTION_i
, skip
= 0;
160 else if (text
[1] == 'l')
162 else if (text
[1] == 'L')
163 opt
= OPTION_L
, arg
= text
+ 2;
164 else if (text
[1] == 'o')
166 else if ((text
[1] == 'S') && (text
[2] == '\0'))
167 opt
= OPTION_S
, skip
= 0;
168 else if (text
[1] == 'V')
169 opt
= OPTION_V
, skip
= (text
[2] == '\0');
170 else if ((text
[1] == 'v') && (text
[2] == '\0'))
171 opt
= OPTION_v
, skip
= 0;
172 else if (text
[1] == 'x')
173 opt
= OPTION_x
, arg
= text
+ 2;
176 if ((skip
= WORD_SWITCH_TAKES_ARG (text
+ 1)) != 0) /* See gcc.c. */
178 else if (! strncmp (text
, "-fdriver", 8)) /* Really --driver!! */
179 opt
= OPTION_driver
; /* Never mind arg, this is unsupported. */
180 else if (! strcmp (text
, "-fhelp")) /* Really --help!! */
182 else if (! strcmp (text
, "-M"))
184 else if (! strcmp (text
, "-MM"))
186 else if (! strcmp (text
, "-nostdlib")
187 || ! strcmp (text
, "-nodefaultlibs"))
188 opt
= OPTION_nostdlib
;
189 else if (! strcmp (text
, "-fsyntax-only"))
190 opt
= OPTION_syntax_only
;
191 else if (! strcmp (text
, "-dumpversion"))
192 opt
= OPTION_version
;
193 else if (! strcmp (text
, "-Xlinker")
194 || ! strcmp (text
, "-specs"))
214 /* Append another argument to the list being built. As long as it is
215 identical to the corresponding arg in the original list, just increment
216 the new arg count. Otherwise allocate a new list, etc. */
222 static int newargsize
;
225 fprintf (stderr
, "`%s'\n", arg
);
228 if (g77_newargv
== g77_xargv
229 && g77_newargc
< g77_xargc
230 && (arg
== g77_xargv
[g77_newargc
]
231 || ! strcmp (arg
, g77_xargv
[g77_newargc
])))
234 return; /* Nothing new here. */
237 if (g77_newargv
== g77_xargv
)
238 { /* Make new arglist. */
241 newargsize
= (g77_xargc
<< 2) + 20; /* This should handle all. */
242 g77_newargv
= (const char **) xmalloc (newargsize
* sizeof (char *));
244 /* Copy what has been done so far. */
245 for (i
= 0; i
< g77_newargc
; ++i
)
246 g77_newargv
[i
] = g77_xargv
[i
];
249 if (g77_newargc
== newargsize
)
250 fatal ("overflowed output arg list for `%s'", arg
);
252 g77_newargv
[g77_newargc
++] = arg
;
256 lang_specific_driver (in_argc
, in_argv
, in_added_libraries
)
258 const char *const **in_argv
;
259 int *in_added_libraries ATTRIBUTE_UNUSED
;
262 const char *const *argv
= *in_argv
;
269 /* This will be NULL if we encounter a situation where we should not
271 const 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");
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'))
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 (Fortran Frontend 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) 2000 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 it 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 For bug reporting instructions, please see:\n\
436 fatal ("--driver no longer supported");
440 add_version_magic
= 0;
444 /* This is the one place we check for missing arguments in the
450 fatal ("argument to `%s' missing", argv
[i
]);
453 if ((n_outfiles
!= 0) && (n_infiles
== 0))
454 fatal ("No input files; unwilling to write output files");
456 /* Second pass through arglist, transforming arguments as appropriate. */
458 append_arg (argv
[0]); /* Start with command name, of course. */
460 for (i
= 1; i
< argc
; ++i
)
462 if (argv
[i
][0] == '\0')
464 append_arg (argv
[i
]); /* Interesting. Just append as is. */
468 if ((argv
[i
][0] == '-') && (argv
[i
][1] != 'l'))
470 /* Not a filename or library. */
472 if (saw_library
== 1 && need_math
) /* -l<library>. */
473 append_arg (MATH_LIBRARY
);
477 lookup_option (&opt
, &skip
, &arg
, argv
[i
]);
479 if (argv
[i
][1] == '\0')
481 append_arg (argv
[i
]); /* "-" == Standard input. */
487 /* Track input language. */
495 saw_speclang
= (strcmp (lang
, "none") != 0);
498 append_arg (argv
[i
]);
500 for (; skip
!= 0; --skip
)
501 append_arg (argv
[++i
]);
506 /* A filename/library, not an option. */
509 saw_library
= 0; /* -xfoo currently active. */
511 { /* -lfoo or filename. */
512 if (strcmp (argv
[i
], MATH_LIBRARY
) == 0
514 || strcmp (argv
[i
], ALT_LIBM
) == 0
518 if (saw_library
== 1)
519 saw_library
= 2; /* -l<library> -lm. */
521 append_arg (FORTRAN_LIBRARY
);
523 else if (strcmp (argv
[i
], FORTRAN_LIBRARY
) == 0)
524 saw_library
= 1; /* -l<library>. */
526 { /* Other library, or filename. */
527 if (saw_library
== 1 && need_math
)
528 append_arg (MATH_LIBRARY
);
532 append_arg (argv
[i
]);
535 /* Append `-lg2c -lm' as necessary. */
537 if (! add_version_magic
&& library
)
538 { /* Doing a link and no -nostdlib. */
540 append_arg ("-xnone");
545 append_arg (library
);
548 append_arg (MATH_LIBRARY
);
553 else if (add_version_magic
&& verbose
)
556 append_arg ("-xf77-version");
557 append_arg ("/dev/null");
558 append_arg ("-xnone");
562 && g77_newargv
!= g77_xargv
)
564 fprintf (stderr
, "Driving:");
565 for (i
= 0; i
< g77_newargc
; i
++)
566 fprintf (stderr
, " %s", g77_newargv
[i
]);
567 fprintf (stderr
, "\n");
570 *in_argc
= g77_newargc
;
571 *in_argv
= g77_newargv
;
574 /* Called before linking. Returns 0 on success and -1 on failure. */
575 int lang_specific_pre_link () /* Not used for F77. */
580 /* Number of extra output files that lang_specific_pre_link may generate. */
581 int lang_specific_extra_outfiles
= 0; /* Not used for F77. */