configurator: Add OpenMP detection
[ccan] / tools / configurator / configurator.c
1 /* Simple tool to create config.h.
2  * Would be much easier with ccan modules, but deliberately standalone.
3  *
4  * Copyright 2011 Rusty Russell <rusty@rustcorp.com.au>.  MIT license.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 #include <stdio.h>
25 #include <stdbool.h>
26 #include <stdlib.h>
27 #include <unistd.h>
28 #include <err.h>
29 #include <sys/types.h>
30 #include <sys/wait.h>
31 #include <sys/stat.h>
32 #include <fcntl.h>
33 #include <string.h>
34
35 #define DEFAULT_COMPILER "cc"
36 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
37
38 #define OUTPUT_FILE "configurator.out"
39 #define INPUT_FILE "configuratortest.c"
40
41 static int verbose;
42
43 enum test_style {
44         OUTSIDE_MAIN            = 0x1,
45         DEFINES_FUNC            = 0x2,
46         INSIDE_MAIN             = 0x4,
47         DEFINES_EVERYTHING      = 0x8,
48         MAY_NOT_COMPILE         = 0x10,
49         EXECUTE                 = 0x8000
50 };
51
52 struct test {
53         const char *name;
54         enum test_style style;
55         const char *depends;
56         const char *link;
57         const char *fragment;
58         const char *flags;
59         const char *overrides; /* On success, force this to '1' */
60         bool done;
61         bool answer;
62 };
63
64 static struct test tests[] = {
65         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
66           "#include <sys/types.h>\n"
67           "int main(void) {\n"
68           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
69           "}\n" },
70         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
71           "return __alignof__(double) > 0 ? 0 : 1;" },
72         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
73           "#ifndef _GNU_SOURCE\n"
74           "#define _GNU_SOURCE\n"
75           "#endif\n"
76           "#include <stdio.h>\n"
77           "static char *func(int x) {"
78           "     char *p;\n"
79           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
80           "     return p;\n"
81           "}" },
82         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
83           "static int __attribute__((cold)) func(int x) { return x; }" },
84         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
85           "static int __attribute__((const)) func(int x) { return x; }" },
86         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
87           "static int __attribute__((pure)) func(int x) { return x; }" },
88         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
89           "typedef short __attribute__((__may_alias__)) short_a;" },
90         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
91           "#include <stdlib.h>\n"
92           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
93         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
94           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
95         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
96           "static int __attribute__((unused)) func(int x) { return x; }" },
97         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
98           "static int __attribute__((used)) func(int x) { return x; }" },
99         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
100           "#include <execinfo.h>\n"
101           "static int func(int x) {"
102           "     void *bt[10];\n"
103           "     return backtrace(bt, 10) < x;\n"
104           "}" },
105         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
106           "union { int i; char c[sizeof(int)]; } u;\n"
107           "u.i = 0x01020304;\n"
108           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
109         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
110           "#include <byteswap.h>\n"
111           "static int func(int x) { return bswap_64(x); }" },
112         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
113           "return __builtin_choose_expr(1, 0, \"garbage\");" },
114         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
115           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
116         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
117           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
118         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
119           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
120         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
121           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
122         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
123           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
124         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
125           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
126         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
127           "return __builtin_constant_p(1) ? 0 : 1;" },
128         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
129           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
130         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
131           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
132         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
133           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
134         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
135           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
136         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
137           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
138         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
139           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
140         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
141           "#include <intrinsics.h>\n"
142           "int func(int v) {\n"
143           "     return __CLZ(__RBIT(v));\n"
144           "}" },
145         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
146           "#include <byteswap.h>\n" },
147         { "HAVE_CLOCK_GETTIME",
148           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
149           "#include <time.h>\n"
150           "static struct timespec func(void) {\n"
151           "     struct timespec ts;\n"
152           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
153           "     return ts;\n"
154           "}\n" },
155         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
156           DEFINES_FUNC,
157           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
158           "-lrt",
159           "#include <time.h>\n"
160           "static struct timespec func(void) {\n"
161           "     struct timespec ts;\n"
162           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
163           "     return ts;\n"
164           "}\n",
165           /* This means HAVE_CLOCK_GETTIME, too */
166           "HAVE_CLOCK_GETTIME" },
167         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
168           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
169           "return foo[0] ? 0 : 1;" },
170         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
171           "#include <sys/types.h>\n"
172           "#include <sys/stat.h>\n"
173           "#include <fcntl.h>\n"
174           "#include <unistd.h>\n"
175           "int main(void) {\n"
176           "     int fd = open(\"..\", O_RDONLY);\n"
177           "     return fchdir(fd) == 0 ? 0 : 1;\n"
178           "}\n" },
179         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
180           "#include <err.h>\n"
181           "static void func(int arg) {\n"
182           "     if (arg == 0)\n"
183           "             err(1, \"err %u\", arg);\n"
184           "     if (arg == 1)\n"
185           "             errx(1, \"err %u\", arg);\n"
186           "     if (arg == 3)\n"
187           "             warn(\"warn %u\", arg);\n"
188           "     if (arg == 4)\n"
189           "             warnx(\"warn %u\", arg);\n"
190           "}\n" },
191         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
192           "HAVE_32BIT_OFF_T", NULL,
193           "#define _FILE_OFFSET_BITS 64\n"
194           "#include <sys/types.h>\n"
195           "int main(void) {\n"
196           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
197           "}\n" },
198         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
199           "for (int i = 0; i < argc; i++) { return 0; };\n"
200           "return 1;" },
201         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
202           "struct foo { unsigned int x; int arr[]; };" },
203         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
204           "#include <unistd.h>\n"
205           "static int func(void) { return getpagesize(); }" },
206         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
207           "#ifndef _GNU_SOURCE\n"
208           "#define _GNU_SOURCE\n"
209           "#endif\n"
210           "#include <ctype.h>\n"
211           "static int func(void) { return isblank(' '); }" },
212         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
213           "union { int i; char c[sizeof(int)]; } u;\n"
214           "u.i = 0x01020304;\n"
215           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
216         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
217           "#ifndef _GNU_SOURCE\n"
218           "#define _GNU_SOURCE\n"
219           "#endif\n"
220           "#include <string.h>\n"
221           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
222           "return memmem(h, hl, n, nl);"
223           "}\n", },
224         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
225           "#ifndef _GNU_SOURCE\n"
226           "#define _GNU_SOURCE\n"
227           "#endif\n"
228           "#include <string.h>\n"
229           "static void *func(void *s, int c, size_t n) {\n"
230           "return memrchr(s, c, n);"
231           "}\n", },
232         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
233           "#include <sys/mman.h>\n"
234           "static void *func(int fd) {\n"
235           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
236           "}" },
237         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
238           "#include <sys/types.h>\n"
239           "#include <sys/stat.h>\n"
240           "#include <fcntl.h>\n"
241           "int main(void) {\n"
242           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
243           "}\n" },
244         { "HAVE_QSORT_R_PRIVATE_LAST",
245           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
246           "#ifndef _GNU_SOURCE\n"
247           "#define _GNU_SOURCE\n"
248           "#endif\n"
249           "#include <stdlib.h>\n"
250           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
251           " *(unsigned int *)priv = 1;\n"
252           " return *(const int *)lp - *(const int *)rp; }\n"
253           "int main(void) {\n"
254           " int array[] = { 9, 2, 5 };\n"
255           " unsigned int called = 0;\n"
256           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
257           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
258           "}\n" },
259         { "HAVE_STRUCT_TIMESPEC",
260           DEFINES_FUNC, NULL, NULL,
261           "#include <time.h>\n"
262           "static void func(void) {\n"
263           "     struct timespec ts;\n"
264           "     ts.tv_sec = ts.tv_nsec = 1;\n"
265           "}\n" },
266         { "HAVE_SECTION_START_STOP",
267           DEFINES_FUNC, NULL, NULL,
268           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
269           "static int func(void) {\n"
270           "     extern void *__start_mysec[], *__stop_mysec[];\n"
271           "     return __stop_mysec - __start_mysec;\n"
272           "}\n" },
273         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
274           "static long nest(const void *base, unsigned int i)\n"
275           "{\n"
276           "     if (i == 0)\n"
277           "             return (const char *)&i - (const char *)base;\n"
278           "     return nest(base, i-1);\n"
279           "}\n"
280           "int main(int argc, char *argv[]) {\n"
281           "     (void)argv;\n"
282           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
283           "}\n" },
284         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
285           "return ({ int x = argc; x == argc ? 0 : 1; });" },
286         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
287           "#include <sys/filio.h>\n" },
288         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
289           "#include <sys/termios.h>\n" },
290         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
291           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
292         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
293           "#include <string.h>\n"
294           "int main(int argc, char *argv[]) {\n"
295           "     (void)argc;\n"
296           "     char pad[sizeof(int *) * 1];\n"
297           "     strncpy(pad, argv[0], sizeof(pad));\n"
298           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
299           "     return *x == *y;\n"
300           "}\n" },
301         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
302           "#include <sys/types.h>\n"
303           "#include <utime.h>\n"
304           "static int func(const char *filename) {\n"
305           "     struct utimbuf times = { 0 };\n"
306           "     return utime(filename, &times);\n"
307           "}" },
308         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
309           "#include <sys/types.h>\n"
310           "#include <utime.h>\n"
311           "static __attribute__((warn_unused_result)) int func(int i) {\n"
312           "     return i + 1;\n"
313           "}" },
314         { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
315           "int i;\n"
316           "#pragma omp parallel for\n"
317           "for(i = 0; i < 0; i++) {};\n"
318           "return 0;\n",
319           "-Werror -fopenmp" },
320 };
321
322 static char *grab_fd(int fd)
323 {
324         int ret;
325         size_t max, size = 0;
326         char *buffer;
327
328         max = 16384;
329         buffer = malloc(max+1);
330         while ((ret = read(fd, buffer + size, max - size)) > 0) {
331                 size += ret;
332                 if (size == max)
333                         buffer = realloc(buffer, max *= 2);
334         }
335         if (ret < 0)
336                 err(1, "reading from command");
337         buffer[size] = '\0';
338         return buffer;
339 }
340
341 static char *run(const char *cmd, int *exitstatus)
342 {
343         pid_t pid;
344         int p[2];
345         char *ret;
346         int status;
347
348         if (pipe(p) != 0)
349                 err(1, "creating pipe");
350
351         pid = fork();
352         if (pid == -1)
353                 err(1, "forking");
354
355         if (pid == 0) {
356                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
357                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
358                     || close(p[0]) != 0
359                     || close(STDIN_FILENO) != 0
360                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
361                         exit(128);
362
363                 status = system(cmd);
364                 if (WIFEXITED(status))
365                         exit(WEXITSTATUS(status));
366                 /* Here's a hint... */
367                 exit(128 + WTERMSIG(status));
368         }
369
370         close(p[1]);
371         ret = grab_fd(p[0]);
372         /* This shouldn't fail... */
373         if (waitpid(pid, &status, 0) != pid)
374                 err(1, "Failed to wait for child");
375         close(p[0]);
376         if (WIFEXITED(status))
377                 *exitstatus = WEXITSTATUS(status);
378         else
379                 *exitstatus = -WTERMSIG(status);
380         return ret;
381 }
382
383 static char *connect_args(const char *argv[], const char *extra)
384 {
385         unsigned int i, len = strlen(extra) + 1;
386         char *ret;
387
388         for (i = 1; argv[i]; i++)
389                 len += 1 + strlen(argv[i]);
390
391         ret = malloc(len);
392         len = 0;
393         for (i = 1; argv[i]; i++) {
394                 strcpy(ret + len, argv[i]);
395                 len += strlen(argv[i]);
396                 if (argv[i+1])
397                         ret[len++] = ' ';
398         }
399         strcpy(ret + len, extra);
400         return ret;
401 }
402
403 static struct test *find_test(const char *name)
404 {
405         unsigned int i;
406
407         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
408                 if (strcmp(tests[i].name, name) == 0)
409                         return &tests[i];
410         }
411         abort();
412 }
413
414 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
415 #define MAIN_START_BOILERPLATE \
416         "int main(int argc, char *argv[]) {\n" \
417         "       (void)argc;\n" \
418         "       (void)argv;\n"
419 #define USE_FUNC_BOILERPLATE "(void)func;\n"
420 #define MAIN_BODY_BOILERPLATE "return 0;\n"
421 #define MAIN_END_BOILERPLATE "}\n"
422
423 static bool run_test(const char *cmd, struct test *test)
424 {
425         char *output, *newcmd;
426         FILE *outf;
427         int status;
428
429         if (test->done)
430                 return test->answer;
431
432         if (test->depends) {
433                 size_t len;
434                 const char *deps = test->depends;
435                 char *dep;
436
437                 /* Space-separated dependencies, could be ! for inverse. */
438                 while ((len = strcspn(deps, " "))) {
439                         bool positive = true;
440                         if (deps[len]) {
441                                 dep = strdup(deps);
442                                 dep[len] = '\0';
443                         } else {
444                                 dep = (char *)deps;
445                         }
446
447                         if (dep[0] == '!') {
448                                 dep++;
449                                 positive = false;
450                         }
451                         if (run_test(cmd, find_test(dep)) != positive) {
452                                 test->answer = false;
453                                 test->done = true;
454                                 return test->answer;
455                         }
456                         if (deps[len])
457                                 free(dep);
458
459                         deps += len;
460                         deps += strspn(deps, " ");
461                 }
462         }
463
464         outf = fopen(INPUT_FILE, "w");
465         if (!outf)
466                 err(1, "creating %s", INPUT_FILE);
467
468         fprintf(outf, "%s", PRE_BOILERPLATE);
469         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
470         case INSIDE_MAIN:
471                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
472                 fprintf(outf, "%s", test->fragment);
473                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
474                 break;
475         case OUTSIDE_MAIN:
476                 fprintf(outf, "%s", test->fragment);
477                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
478                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
479                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
480                 break;
481         case DEFINES_FUNC:
482                 fprintf(outf, "%s", test->fragment);
483                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
484                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
485                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
486                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
487                 break;
488         case DEFINES_EVERYTHING:
489                 fprintf(outf, "%s", test->fragment);
490                 break;
491         default:
492                 abort();
493
494         }
495         fclose(outf);
496
497         if (verbose > 1)
498                 if (system("cat " INPUT_FILE) == -1);
499
500         newcmd = strdup(cmd);
501
502         if (test->flags) {
503                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
504                                 + strlen(test->flags) + 1);
505                 strcat(newcmd, " ");
506                 strcat(newcmd, test->flags);
507                 if (verbose > 1)
508                         printf("Extra flags line: %s", newcmd);
509         }
510
511         if (test->link) {
512                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
513                                 + strlen(test->link) + 1);
514                 strcat(newcmd, " ");
515                 strcat(newcmd, test->link);
516                 if (verbose > 1)
517                         printf("Extra link line: %s", newcmd);
518         }
519
520         output = run(newcmd, &status);
521
522         free(newcmd);
523
524         if (status != 0 || strstr(output, "warning")) {
525                 if (verbose)
526                         printf("Compile %s for %s, status %i: %s\n",
527                                status ? "fail" : "warning",
528                                test->name, status, output);
529                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
530                         errx(1, "Test for %s did not compile:\n%s",
531                              test->name, output);
532                 test->answer = false;
533                 free(output);
534         } else {
535                 /* Compile succeeded. */
536                 free(output);
537                 /* We run INSIDE_MAIN tests for sanity checking. */
538                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
539                         output = run("./" OUTPUT_FILE, &status);
540                         if (!(test->style & EXECUTE) && status != 0)
541                                 errx(1, "Test for %s failed with %i:\n%s",
542                                      test->name, status, output);
543                         if (verbose && status)
544                                 printf("%s exited %i\n", test->name, status);
545                         free(output);
546                 }
547                 test->answer = (status == 0);
548         }
549         test->done = true;
550
551         if (test->answer && test->overrides) {
552                 struct test *override = find_test(test->overrides);
553                 override->done = true;
554                 override->answer = true;
555         }
556         return test->answer;
557 }
558
559 int main(int argc, const char *argv[])
560 {
561         char *cmd;
562         unsigned int i;
563         const char *default_args[]
564                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
565
566         if (argc > 1) {
567                 if (strcmp(argv[1], "--help") == 0) {
568                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
569                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
570                                "Default: %s %s\n",
571                                DEFAULT_COMPILER, DEFAULT_FLAGS);
572                         exit(0);
573                 }
574                 if (strcmp(argv[1], "-v") == 0) {
575                         argc--;
576                         argv++;
577                         verbose = 1;
578                 } else if (strcmp(argv[1], "-vv") == 0) {
579                         argc--;
580                         argv++;
581                         verbose = 2;
582                 }
583         }
584
585         if (argc == 1)
586                 argv = default_args;
587
588         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
589         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
590                 run_test(cmd, &tests[i]);
591         free(cmd);
592
593         unlink(OUTPUT_FILE);
594         unlink(INPUT_FILE);
595
596         printf("/* Generated by CCAN configurator */\n"
597                "#ifndef CCAN_CONFIG_H\n"
598                "#define CCAN_CONFIG_H\n");
599         printf("#ifndef _GNU_SOURCE\n");
600         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
601         printf("#endif\n");
602         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
603         cmd = connect_args(argv+1, "");
604         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
605         free(cmd);
606         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
607         printf("#define HAVE_CCAN 1\n");
608         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
609                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
610         printf("#endif /* CCAN_CONFIG_H */\n");
611         return 0;
612 }