1 /* Specific flags and argument handling of the C++ front end.
2 Copyright (C) 1996-2019 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC 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 3, or (at your option)
11 GCC 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 GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
26 /* This bit is set if we saw a `-xfoo' language specification. */
27 #define LANGSPEC (1<<1)
28 /* This bit is set if they did `-lm' or `-lmath'. */
29 #define MATHLIB (1<<2)
30 /* This bit is set if they did `-lrt' or equivalent. */
31 #define TIMELIB (1<<3)
32 /* This bit is set if they did `-lc'. */
33 #define WITHLIBC (1<<4)
34 /* Skip this option. */
35 #define SKIPOPT (1<<5)
38 #define MATH_LIBRARY "m"
40 #ifndef MATH_LIBRARY_PROFILE
41 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
45 #define TIME_LIBRARY ""
49 #define LIBSTDCXX "stdc++"
51 #ifndef LIBSTDCXX_PROFILE
52 #define LIBSTDCXX_PROFILE LIBSTDCXX
54 #ifndef LIBSTDCXX_STATIC
55 #define LIBSTDCXX_STATIC NULL
59 lang_specific_driver (struct cl_decoded_option
**in_decoded_options
,
60 unsigned int *in_decoded_options_count
,
61 int *in_added_libraries
)
65 /* If nonzero, the user gave us the `-p' or `-pg' flag. */
66 int saw_profile_flag
= 0;
68 /* What do with libstdc++:
69 -1 means we should not link in libstdc++
70 0 means we should link in libstdc++ if it is needed
71 1 means libstdc++ is needed and should be linked in.
72 2 means libstdc++ is needed and should be linked statically. */
75 /* The number of arguments being added to what's in argv, other than
76 libraries. We use this to track the number of times we've inserted
80 /* The new argument list will be contained in this. */
81 struct cl_decoded_option
*new_decoded_options
;
83 /* Nonzero if we saw a `-xfoo' language specification on the
84 command line. Used to avoid adding our own -xc++ if the user
85 already gave a language for the file. */
88 /* "-lm" or "-lmath" if it appears on the command line. */
89 const struct cl_decoded_option
*saw_math
= NULL
;
91 /* "-lrt" or eqivalent if it appears on the command line. */
92 const struct cl_decoded_option
*saw_time
= NULL
;
94 /* "-lc" if it appears on the command line. */
95 const struct cl_decoded_option
*saw_libc
= NULL
;
97 /* An array used to flag each argument that needs a bit set for
98 LANGSPEC, MATHLIB, TIMELIB, or WITHLIBC. */
101 /* By default, we throw on the math library if we have one. */
102 int need_math
= (MATH_LIBRARY
[0] != '\0');
104 /* By default, we throw on the time library if we have one. */
105 int need_time
= (TIME_LIBRARY
[0] != '\0');
107 /* True if we saw -static. */
110 /* True if we should add -shared-libgcc to the command-line. */
111 int shared_libgcc
= 1;
113 /* The total number of arguments with the new stuff. */
116 /* The argument list. */
117 struct cl_decoded_option
*decoded_options
;
119 /* The number of libraries added in. */
122 /* The total number of arguments with the new stuff. */
123 unsigned int num_args
= 1;
125 argc
= *in_decoded_options_count
;
126 decoded_options
= *in_decoded_options
;
127 added_libraries
= *in_added_libraries
;
129 args
= XCNEWVEC (int, argc
);
131 for (i
= 1; i
< argc
; i
++)
133 const char *arg
= decoded_options
[i
].arg
;
134 if (decoded_options
[i
].errors
& CL_ERR_MISSING_ARG
)
135 continue; /* Avoid examining arguments of options missing them. */
137 switch (decoded_options
[i
].opt_index
)
140 case OPT_nodefaultlibs
:
145 if (strcmp (arg
, MATH_LIBRARY
) == 0)
150 else if (strcmp (arg
, TIME_LIBRARY
) == 0)
155 else if (strcmp (arg
, "c") == 0)
158 /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */
159 library
= (library
== 0) ? 1 : library
;
169 && (strcmp (arg
, "c++") == 0
170 || strcmp (arg
, "c++-cpp-output") == 0
171 || strcmp (arg
, "objective-c++") == 0
172 || strcmp (arg
, "objective-c++-cpp-output") == 0))
180 /* Arguments that go directly to the linker might be .o files,
181 or something, and so might cause libstdc++ to be needed. */
192 case OPT_fsyntax_only
:
193 /* Don't specify libraries if we won't link, since that would
202 case OPT_static_libgcc
:
206 case OPT_static_libstdc__
:
207 library
= library
>= 0 ? 2 : library
;
211 case OPT_SPECIAL_input_file
:
215 /* We don't do this anymore, since we don't get them with minus
217 if (arg
[0] == '\0' || arg
[1] == '\0')
226 /* If the filename ends in .[chi], put options around it.
227 But not if a specified -x option is currently active. */
230 && (arg
[len
- 1] == 'c'
231 || arg
[len
- 1] == 'i'
232 || arg
[len
- 1] == 'h')
233 && arg
[len
- 2] == '.')
239 /* If we don't know that this is a header file, we might
240 need to be linking in the libraries. */
243 if ((len
<= 2 || strcmp (arg
+ (len
- 2), ".H") != 0)
244 && (len
<= 2 || strcmp (arg
+ (len
- 2), ".h") != 0)
245 && (len
<= 4 || strcmp (arg
+ (len
- 4), ".hpp") != 0)
246 && (len
<= 3 || strcmp (arg
+ (len
- 3), ".hp") != 0)
247 && (len
<= 4 || strcmp (arg
+ (len
- 4), ".hxx") != 0)
248 && (len
<= 4 || strcmp (arg
+ (len
- 4), ".h++") != 0)
249 && (len
<= 4 || strcmp (arg
+ (len
- 4), ".HPP") != 0)
250 && (len
<= 4 || strcmp (arg
+ (len
- 4), ".tcc") != 0)
251 && (len
<= 3 || strcmp (arg
+ (len
- 3), ".hh") != 0))
259 /* There's no point adding -shared-libgcc if we don't have a shared
261 #ifndef ENABLE_SHARED_LIBGCC
265 /* Add one for shared_libgcc or extra static library. */
266 num_args
= argc
+ added
+ need_math
+ (library
> 0) * 4 + 1;
267 new_decoded_options
= XNEWVEC (struct cl_decoded_option
, num_args
);
272 /* Copy the 0th argument, i.e., the name of the program itself. */
273 new_decoded_options
[j
++] = decoded_options
[i
++];
275 /* NOTE: We start at 1 now, not 0. */
278 new_decoded_options
[j
] = decoded_options
[i
];
280 /* Make sure -lstdc++ is before the math library, since libstdc++
281 itself uses those math routines. */
282 if (!saw_math
&& (args
[i
] & MATHLIB
) && library
> 0)
285 saw_math
= &decoded_options
[i
];
288 if (!saw_time
&& (args
[i
] & TIMELIB
) && library
> 0)
291 saw_time
= &decoded_options
[i
];
294 if (!saw_libc
&& (args
[i
] & WITHLIBC
) && library
> 0)
297 saw_libc
= &decoded_options
[i
];
300 /* Wrap foo.[chi] files in a language specification to
301 force the gcc compiler driver to run cc1plus on them. */
302 if (args
[i
] & LANGSPEC
)
304 const char *arg
= decoded_options
[i
].arg
;
305 int len
= strlen (arg
);
306 switch (arg
[len
- 1])
309 generate_option (OPT_x
, "c++", 1, CL_DRIVER
,
310 &new_decoded_options
[j
++]);
313 generate_option (OPT_x
, "c++-cpp-output", 1, CL_DRIVER
,
314 &new_decoded_options
[j
++]);
317 generate_option (OPT_x
, "c++-header", 1, CL_DRIVER
,
318 &new_decoded_options
[j
++]);
323 new_decoded_options
[j
++] = decoded_options
[i
];
324 generate_option (OPT_x
, "none", 1, CL_DRIVER
,
325 &new_decoded_options
[j
]);
328 if ((args
[i
] & SKIPOPT
) != 0)
335 /* Add `-lstdc++' if we haven't already done so. */
338 #ifdef HAVE_LD_STATIC_DYNAMIC
339 if (library
> 1 && !static_link
)
341 generate_option (OPT_Wl_
, LD_STATIC_OPTION
, 1, CL_DRIVER
,
342 &new_decoded_options
[j
]);
346 generate_option (OPT_l
,
347 saw_profile_flag
? LIBSTDCXX_PROFILE
: LIBSTDCXX
, 1,
348 CL_DRIVER
, &new_decoded_options
[j
]);
351 /* Add target-dependent static library, if necessary. */
352 if ((static_link
|| library
> 1) && LIBSTDCXX_STATIC
!= NULL
)
354 generate_option (OPT_l
, LIBSTDCXX_STATIC
, 1,
355 CL_DRIVER
, &new_decoded_options
[j
]);
359 #ifdef HAVE_LD_STATIC_DYNAMIC
360 if (library
> 1 && !static_link
)
362 generate_option (OPT_Wl_
, LD_DYNAMIC_OPTION
, 1, CL_DRIVER
,
363 &new_decoded_options
[j
]);
369 new_decoded_options
[j
++] = *saw_math
;
370 else if (library
> 0 && need_math
)
372 generate_option (OPT_l
,
373 saw_profile_flag
? MATH_LIBRARY_PROFILE
: MATH_LIBRARY
,
374 1, CL_DRIVER
, &new_decoded_options
[j
]);
379 new_decoded_options
[j
++] = *saw_time
;
380 else if (library
> 0 && need_time
)
382 generate_option (OPT_l
, TIME_LIBRARY
, 1, CL_DRIVER
,
383 &new_decoded_options
[j
]);
388 new_decoded_options
[j
++] = *saw_libc
;
389 if (shared_libgcc
&& !static_link
)
390 generate_option (OPT_shared_libgcc
, NULL
, 1, CL_DRIVER
,
391 &new_decoded_options
[j
++]);
393 *in_decoded_options_count
= j
;
394 *in_decoded_options
= new_decoded_options
;
395 *in_added_libraries
= added_libraries
;
398 /* Called before linking. Returns 0 on success and -1 on failure. */
399 int lang_specific_pre_link (void) /* Not used for C++. */
404 /* Number of extra output files that lang_specific_pre_link may generate. */
405 int lang_specific_extra_outfiles
= 0; /* Not used for C++. */