1 /* Specific flags and argument handling of the C++ front-end.
2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "tm.h"
26 #include "gcc.h"
27
28 /* This bit is set if we saw a `-xfoo' language specification. */
29 #define LANGSPEC (1<<1)
30 /* This bit is set if they did `-lm' or `-lmath'. */
31 #define MATHLIB (1<<2)
32 /* This bit is set if they did `-lc'. */
33 #define WITHLIBC (1<<3)
34
35 #ifndef MATH_LIBRARY
36 #define MATH_LIBRARY "-lm"
37 #endif
38 #ifndef MATH_LIBRARY_PROFILE
39 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
40 #endif
41
42 #ifndef LIBSTDCXX
43 #define LIBSTDCXX "-lstdc++"
44 #endif
45 #ifndef LIBSTDCXX_PROFILE
46 #define LIBSTDCXX_PROFILE LIBSTDCXX
47 #endif
48
49 void
lang_specific_driver(int * in_argc,const char * const ** in_argv,int * in_added_libraries)50 lang_specific_driver (int *in_argc, const char *const **in_argv,
51 int *in_added_libraries)
52 {
53 int i, j;
54
55 /* If nonzero, the user gave us the `-p' or `-pg' flag. */
56 int saw_profile_flag = 0;
57
58 /* If nonzero, the user gave us the `-v' flag. */
59 int saw_verbose_flag = 0;
60
61 /* This is a tristate:
62 -1 means we should not link in libstdc++
63 0 means we should link in libstdc++ if it is needed
64 1 means libstdc++ is needed and should be linked in. */
65 int library = 0;
66
67 /* The number of arguments being added to what's in argv, other than
68 libraries. We use this to track the number of times we've inserted
69 -xc++/-xnone. */
70 int added = 0;
71
72 /* Used to track options that take arguments, so we don't go wrapping
73 those with -xc++/-xnone. */
74 const char *quote = NULL;
75
76 /* The new argument list will be contained in this. */
77 const char **arglist;
78
79 /* Nonzero if we saw a `-xfoo' language specification on the
80 command line. Used to avoid adding our own -xc++ if the user
81 already gave a language for the file. */
82 int saw_speclang = 0;
83
84 /* "-lm" or "-lmath" if it appears on the command line. */
85 const char *saw_math = 0;
86
87 /* "-lc" if it appears on the command line. */
88 const char *saw_libc = 0;
89
90 /* An array used to flag each argument that needs a bit set for
91 LANGSPEC, MATHLIB, or WITHLIBC. */
92 int *args;
93
94 /* By default, we throw on the math library if we have one. */
95 int need_math = (MATH_LIBRARY[0] != '\0');
96
97 /* True if we should add -shared-libgcc to the command-line. */
98 int shared_libgcc = 1;
99
100 /* The total number of arguments with the new stuff. */
101 int argc;
102
103 /* The argument list. */
104 const char *const *argv;
105
106 /* The number of libraries added in. */
107 int added_libraries;
108
109 /* The total number of arguments with the new stuff. */
110 int num_args = 1;
111
112 argc = *in_argc;
113 argv = *in_argv;
114 added_libraries = *in_added_libraries;
115
116 args = XCNEWVEC (int, argc);
117
118 for (i = 1; i < argc; i++)
119 {
120 /* If the previous option took an argument, we swallow it here. */
121 if (quote)
122 {
123 quote = NULL;
124 continue;
125 }
126
127 /* We don't do this anymore, since we don't get them with minus
128 signs on them. */
129 if (argv[i][0] == '\0' || argv[i][1] == '\0')
130 continue;
131
132 if (argv[i][0] == '-')
133 {
134 if (strcmp (argv[i], "-nostdlib") == 0
135 || strcmp (argv[i], "-nodefaultlibs") == 0)
136 {
137 library = -1;
138 }
139 else if (strcmp (argv[i], MATH_LIBRARY) == 0)
140 {
141 args[i] |= MATHLIB;
142 need_math = 0;
143 }
144 else if (strcmp (argv[i], "-lc") == 0)
145 args[i] |= WITHLIBC;
146 else if (strcmp (argv[i], "-pg") == 0 || strcmp (argv[i], "-p") == 0)
147 saw_profile_flag++;
148 else if (strcmp (argv[i], "-v") == 0)
149 saw_verbose_flag = 1;
150 else if (strncmp (argv[i], "-x", 2) == 0)
151 {
152 const char * arg;
153 if (argv[i][2] != '\0')
154 arg = argv[i]+2;
155 else if ((argv[i+1]) != NULL)
156 /* We need to swallow arg on next loop. */
157 quote = arg = argv[i+1];
158 else /* Error condition, message will be printed later. */
159 arg = "";
160 if (library == 0
161 && (strcmp (arg, "c++") == 0
162 || strcmp (arg, "c++-cpp-output") == 0))
163 library = 1;
164
165 saw_speclang = 1;
166 }
167 /* Arguments that go directly to the linker might be .o files,
168 or something, and so might cause libstdc++ to be needed. */
169 else if (strcmp (argv[i], "-Xlinker") == 0)
170 {
171 quote = argv[i];
172 if (library == 0)
173 library = 1;
174 }
175 else if (strncmp (argv[i], "-Wl,", 4) == 0)
176 library = (library == 0) ? 1 : library;
177 /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */
178 else if (strncmp (argv[i], "-l", 2) == 0)
179 library = (library == 0) ? 1 : library;
180 else if (((argv[i][2] == '\0'
181 && strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
182 || strcmp (argv[i], "-Tdata") == 0))
183 quote = argv[i];
184 else if ((argv[i][2] == '\0'
185 && strchr ("cSEM", argv[i][1]) != NULL)
186 || strcmp (argv[i], "-MM") == 0
187 || strcmp (argv[i], "-fsyntax-only") == 0)
188 {
189 /* Don't specify libraries if we won't link, since that would
190 cause a warning. */
191 library = -1;
192 }
193 else if (strcmp (argv[i], "-static-libgcc") == 0
194 || strcmp (argv[i], "-static") == 0)
195 shared_libgcc = 0;
196 else if (DEFAULT_WORD_SWITCH_TAKES_ARG (&argv[i][1]))
197 i++;
198 else
199 /* Pass other options through. */
200 continue;
201 }
202 else
203 {
204 int len;
205
206 if (saw_speclang)
207 {
208 saw_speclang = 0;
209 continue;
210 }
211
212 /* If the filename ends in .[chi], put options around it.
213 But not if a specified -x option is currently active. */
214 len = strlen (argv[i]);
215 if (len > 2
216 && (argv[i][len - 1] == 'c'
217 || argv[i][len - 1] == 'i'
218 || argv[i][len - 1] == 'h')
219 && argv[i][len - 2] == '.')
220 {
221 args[i] |= LANGSPEC;
222 added += 2;
223 }
224
225 /* If we don't know that this is a header file, we might
226 need to be linking in the libraries. */
227 if (library == 0)
228 {
229 if ((len <= 2 || strcmp (argv[i] + (len - 2), ".H") != 0)
230 && (len <= 2 || strcmp (argv[i] + (len - 2), ".h") != 0)
231 && (len <= 3 || strcmp (argv[i] + (len - 3), ".hh") != 0))
232 library = 1;
233 }
234 }
235 }
236
237 if (quote)
238 fatal ("argument to '%s' missing\n", quote);
239
240 /* If we know we don't have to do anything, bail now. */
241 if (! added && library <= 0)
242 {
243 free (args);
244 return;
245 }
246
247 /* There's no point adding -shared-libgcc if we don't have a shared
248 libgcc. */
249 #ifndef ENABLE_SHARED_LIBGCC
250 shared_libgcc = 0;
251 #endif
252
253 /* Make sure to have room for the trailing NULL argument. */
254 num_args = argc + added + need_math + shared_libgcc + (library > 0) + 1;
255 arglist = XNEWVEC (const char *, num_args);
256
257 i = 0;
258 j = 0;
259
260 /* Copy the 0th argument, i.e., the name of the program itself. */
261 arglist[i++] = argv[j++];
262
263 /* NOTE: We start at 1 now, not 0. */
264 while (i < argc)
265 {
266 arglist[j] = argv[i];
267
268 /* Make sure -lstdc++ is before the math library, since libstdc++
269 itself uses those math routines. */
270 if (!saw_math && (args[i] & MATHLIB) && library > 0)
271 {
272 --j;
273 saw_math = argv[i];
274 }
275
276 if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
277 {
278 --j;
279 saw_libc = argv[i];
280 }
281
282 /* Wrap foo.[chi] files in a language specification to
283 force the gcc compiler driver to run cc1plus on them. */
284 if (args[i] & LANGSPEC)
285 {
286 int len = strlen (argv[i]);
287 switch (argv[i][len - 1])
288 {
289 case 'c':
290 arglist[j++] = "-xc++";
291 break;
292 case 'i':
293 arglist[j++] = "-xc++-cpp-output";
294 break;
295 case 'h':
296 arglist[j++] = "-xc++-header";
297 break;
298 default:
299 gcc_unreachable ();
300 }
301 arglist[j++] = argv[i];
302 arglist[j] = "-xnone";
303 }
304
305 i++;
306 j++;
307 }
308
309 /* Add `-lstdc++' if we haven't already done so. */
310 if (library > 0)
311 {
312 arglist[j] = saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX;
313 if (arglist[j][0] != '-' || arglist[j][1] == 'l')
314 added_libraries++;
315 j++;
316 }
317 if (saw_math)
318 arglist[j++] = saw_math;
319 else if (library > 0 && need_math)
320 {
321 arglist[j] = saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY;
322 if (arglist[j][0] != '-' || arglist[j][1] == 'l')
323 added_libraries++;
324 j++;
325 }
326 if (saw_libc)
327 arglist[j++] = saw_libc;
328 if (shared_libgcc)
329 arglist[j++] = "-shared-libgcc";
330
331 arglist[j] = NULL;
332
333 *in_argc = j;
334 *in_argv = arglist;
335 *in_added_libraries = added_libraries;
336 }
337
338 /* Called before linking. Returns 0 on success and -1 on failure. */
lang_specific_pre_link(void)339 int lang_specific_pre_link (void) /* Not used for C++. */
340 {
341 return 0;
342 }
343
344 /* Number of extra output files that lang_specific_pre_link may generate. */
345 int lang_specific_extra_outfiles = 0; /* Not used for C++. */
346