dd5587c3b556c31eaa6b2a5887e684d375530e0f
[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 *overrides; /* On success, force this to '1' */
59         bool done;
60         bool answer;
61 };
62
63 static struct test tests[] = {
64         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
65           "#include <sys/types.h>\n"
66           "int main(int argc, char *argv[]) {\n"
67           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
68           "}\n" },
69         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
70           "return __alignof__(double) > 0 ? 0 : 1;" },
71         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
72           "#define _GNU_SOURCE\n"
73           "#include <stdio.h>\n"
74           "static char *func(int x) {"
75           "     char *p;\n"
76           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
77           "     return p;\n"
78           "}" },
79         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
80           "static int __attribute__((cold)) func(int x) { return x; }" },
81         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
82           "static int __attribute__((const)) func(int x) { return x; }" },
83         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
84           "static int __attribute__((pure)) func(int x) { return x; }" },
85         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
86           "typedef short __attribute__((__may_alias__)) short_a;" },
87         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
88           "#include <stdlib.h>\n"
89           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
90         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
91           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
92         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
93           "static int __attribute__((unused)) func(int x) { return x; }" },
94         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
95           "static int __attribute__((used)) func(int x) { return x; }" },
96         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
97           "#include <execinfo.h>\n"
98           "static int func(int x) {"
99           "     void *bt[10];\n"
100           "     return backtrace(bt, 10) < x;\n"
101           "}" },
102         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
103           "union { int i; char c[sizeof(int)]; } u;\n"
104           "u.i = 0x01020304;\n"
105           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
106         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
107           "#include <byteswap.h>\n"
108           "static int func(int x) { return bswap_64(x); }" },
109         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
110           "return __builtin_choose_expr(1, 0, \"garbage\");" },
111         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
112           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
113         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
114           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
115         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
116           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
117         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
118           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
119         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
120           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
121         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
122           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
123         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
124           "return __builtin_constant_p(1) ? 0 : 1;" },
125         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
126           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
127         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
128           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
129         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
130           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
131         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
132           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
133         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
134           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
135         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
136           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
137         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
138           "#include <intrinsics.h>\n"
139           "int func(int v) {\n"
140           "     return __CLZ(__RBIT(v));\n"
141           "}" },
142         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
143           "#include <byteswap.h>\n" },
144         { "HAVE_CLOCK_GETTIME",
145           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
146           "#include <time.h>\n"
147           "static struct timespec func(void) {\n"
148           "     struct timespec ts;\n"
149           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
150           "     return ts;\n"
151           "}\n" },
152         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
153           DEFINES_FUNC,
154           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
155           "-lrt",
156           "#include <time.h>\n"
157           "static struct timespec func(void) {\n"
158           "     struct timespec ts;\n"
159           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
160           "     return ts;\n"
161           "}\n",
162           /* This means HAVE_CLOCK_GETTIME, too */
163           "HAVE_CLOCK_GETTIME" },
164         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
165           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
166           "return foo[0] ? 0 : 1;" },
167         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
168           "#include <sys/types.h>\n"
169           "#include <sys/stat.h>\n"
170           "#include <fcntl.h>\n"
171           "#include <unistd.h>\n"
172           "int main(void) {\n"
173           "     int fd = open(\"..\", O_RDONLY);\n"
174           "     return fchdir(fd) == 0 ? 0 : 1;\n"
175           "}\n" },
176         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
177           "#include <err.h>\n"
178           "static void func(int arg) {\n"
179           "     if (arg == 0)\n"
180           "             err(1, \"err %u\", arg);\n"
181           "     if (arg == 1)\n"
182           "             errx(1, \"err %u\", arg);\n"
183           "     if (arg == 3)\n"
184           "             warn(\"warn %u\", arg);\n"
185           "     if (arg == 4)\n"
186           "             warnx(\"warn %u\", arg);\n"
187           "}\n" },
188         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
189           "HAVE_32BIT_OFF_T", NULL,
190           "#define _FILE_OFFSET_BITS 64\n"
191           "#include <sys/types.h>\n"
192           "int main(int argc, char *argv[]) {\n"
193           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
194           "}\n" },
195         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
196           "for (int i = 0; i < argc; i++) { return 0; };\n"
197           "return 1;" },
198         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
199           "struct foo { unsigned int x; int arr[]; };" },
200         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
201           "#include <unistd.h>\n"
202           "static int func(void) { return getpagesize(); }" },
203         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
204           "#define _GNU_SOURCE\n"
205           "#include <ctype.h>\n"
206           "static int func(void) { return isblank(' '); }" },
207         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
208           "union { int i; char c[sizeof(int)]; } u;\n"
209           "u.i = 0x01020304;\n"
210           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
211         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
212           "#define _GNU_SOURCE\n"
213           "#include <string.h>\n"
214           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
215           "return memmem(h, hl, n, nl);"
216           "}\n", },
217         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
218           "#define _GNU_SOURCE\n"
219           "#include <string.h>\n"
220           "static void *func(void *s, int c, size_t n) {\n"
221           "return memrchr(s, c, n);"
222           "}\n", },
223         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
224           "#include <sys/mman.h>\n"
225           "static void *func(int fd) {\n"
226           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
227           "}" },
228         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
229           "#include <sys/types.h>\n"
230           "#include <sys/stat.h>\n"
231           "#include <fcntl.h>\n"
232           "int main(void) {\n"
233           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
234           "}\n" },
235         { "HAVE_QSORT_R_PRIVATE_LAST",
236           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
237           "#define _GNU_SOURCE 1\n"
238           "#include <stdlib.h>\n"
239           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
240           " *(unsigned int *)priv = 1;\n"
241           " return *(const int *)lp - *(const int *)rp; }\n"
242           "int main(void) {\n"
243           " int array[] = { 9, 2, 5 };\n"
244           " unsigned int called = 0;\n"
245           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
246           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
247           "}\n" },
248         { "HAVE_STRUCT_TIMESPEC",
249           DEFINES_FUNC, NULL, NULL,
250           "#include <time.h>\n"
251           "static void func(void) {\n"
252           "     struct timespec ts;\n"
253           "     ts.tv_sec = ts.tv_nsec = 1;\n"
254           "}\n" },
255         { "HAVE_SECTION_START_STOP",
256           DEFINES_FUNC, NULL, NULL,
257           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
258           "static int func(void) {\n"
259           "     extern void *__start_mysec[], *__stop_mysec[];\n"
260           "     return __stop_mysec - __start_mysec;\n"
261           "}\n" },
262         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
263           "static long nest(const void *base, unsigned int i)\n"
264           "{\n"
265           "     if (i == 0)\n"
266           "             return (const char *)&i - (const char *)base;\n"
267           "     return nest(base, i-1);\n"
268           "}\n"
269           "int main(int argc, char *argv[]) {\n"
270           "     return (nest(&argc, argc) > 0) ? 0 : 1\n;"
271           "}\n" },
272         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
273           "return ({ int x = argc; x == argc ? 0 : 1; });" },
274         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
275           "#include <sys/filio.h>\n" },
276         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
277           "#include <sys/termios.h>\n" },
278         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
279           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
280         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
281           "#include <sys/types.h>\n"
282           "#include <utime.h>\n"
283           "static int func(const char *filename) {\n"
284           "     struct utimbuf times = { 0 };\n"
285           "     return utime(filename, &times);\n"
286           "}" },
287         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
288           "#include <sys/types.h>\n"
289           "#include <utime.h>\n"
290           "static __attribute__((warn_unused_result)) int func(int i) {\n"
291           "     return i + 1;\n"
292           "}" },
293 };
294
295 static char *grab_fd(int fd)
296 {
297         int ret;
298         size_t max, size = 0;
299         char *buffer;
300
301         max = 16384;
302         buffer = malloc(max+1);
303         while ((ret = read(fd, buffer + size, max - size)) > 0) {
304                 size += ret;
305                 if (size == max)
306                         buffer = realloc(buffer, max *= 2);
307         }
308         if (ret < 0)
309                 err(1, "reading from command");
310         buffer[size] = '\0';
311         return buffer;
312 }
313
314 static char *run(const char *cmd, int *exitstatus)
315 {
316         pid_t pid;
317         int p[2];
318         char *ret;
319         int status;
320
321         if (pipe(p) != 0)
322                 err(1, "creating pipe");
323
324         pid = fork();
325         if (pid == -1)
326                 err(1, "forking");
327
328         if (pid == 0) {
329                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
330                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
331                     || close(p[0]) != 0
332                     || close(STDIN_FILENO) != 0
333                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
334                         exit(128);
335
336                 status = system(cmd);
337                 if (WIFEXITED(status))
338                         exit(WEXITSTATUS(status));
339                 /* Here's a hint... */
340                 exit(128 + WTERMSIG(status));
341         }
342
343         close(p[1]);
344         ret = grab_fd(p[0]);
345         /* This shouldn't fail... */
346         if (waitpid(pid, &status, 0) != pid)
347                 err(1, "Failed to wait for child");
348         close(p[0]);
349         if (WIFEXITED(status))
350                 *exitstatus = WEXITSTATUS(status);
351         else
352                 *exitstatus = -WTERMSIG(status);
353         return ret;
354 }
355
356 static char *connect_args(const char *argv[], const char *extra)
357 {
358         unsigned int i, len = strlen(extra) + 1;
359         char *ret;
360
361         for (i = 1; argv[i]; i++)
362                 len += 1 + strlen(argv[i]);
363
364         ret = malloc(len);
365         len = 0;
366         for (i = 1; argv[i]; i++) {
367                 strcpy(ret + len, argv[i]);
368                 len += strlen(argv[i]);
369                 if (argv[i+1])
370                         ret[len++] = ' ';
371         }
372         strcpy(ret + len, extra);
373         return ret;
374 }
375
376 static struct test *find_test(const char *name)
377 {
378         unsigned int i;
379
380         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
381                 if (strcmp(tests[i].name, name) == 0)
382                         return &tests[i];
383         }
384         abort();
385 }
386
387 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
388 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
389 #define USE_FUNC_BOILERPLATE "(void)func;\n"
390 #define MAIN_BODY_BOILERPLATE "return 0;\n"
391 #define MAIN_END_BOILERPLATE "}\n"
392
393 static bool run_test(const char *cmd, struct test *test)
394 {
395         char *output;
396         FILE *outf;
397         int status;
398
399         if (test->done)
400                 return test->answer;
401
402         if (test->depends) {
403                 size_t len;
404                 const char *deps = test->depends;
405                 char *dep;
406
407                 /* Space-separated dependencies, could be ! for inverse. */
408                 while ((len = strcspn(deps, " "))) {
409                         bool positive = true;
410                         if (deps[len]) {
411                                 dep = strdup(deps);
412                                 dep[len] = '\0';
413                         } else {
414                                 dep = (char *)deps;
415                         }
416
417                         if (dep[0] == '!') {
418                                 dep++;
419                                 positive = false;
420                         }
421                         if (run_test(cmd, find_test(dep)) != positive) {
422                                 test->answer = false;
423                                 test->done = true;
424                                 return test->answer;
425                         }
426                         deps += len;
427                         deps += strspn(deps, " ");
428                 }
429         }
430
431         outf = fopen(INPUT_FILE, "w");
432         if (!outf)
433                 err(1, "creating %s", INPUT_FILE);
434
435         fprintf(outf, "%s", PRE_BOILERPLATE);
436         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
437         case INSIDE_MAIN:
438                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
439                 fprintf(outf, "%s", test->fragment);
440                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
441                 break;
442         case OUTSIDE_MAIN:
443                 fprintf(outf, "%s", test->fragment);
444                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
445                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
446                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
447                 break;
448         case DEFINES_FUNC:
449                 fprintf(outf, "%s", test->fragment);
450                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
451                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
452                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
453                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
454                 break;
455         case DEFINES_EVERYTHING:
456                 fprintf(outf, "%s", test->fragment);
457                 break;
458         default:
459                 abort();
460
461         }
462         fclose(outf);
463
464         if (verbose > 1)
465                 if (system("cat " INPUT_FILE) == -1);
466
467         if (test->link) {
468                 char *newcmd;
469                 newcmd = malloc(strlen(cmd) + strlen(" ")
470                                 + strlen(test->link) + 1);
471                 sprintf(newcmd, "%s %s", cmd, test->link);
472                 if (verbose > 1)
473                         printf("Extra link line: %s", newcmd);
474                 cmd = newcmd;
475         }
476
477         output = run(cmd, &status);
478         if (status != 0 || strstr(output, "warning")) {
479                 if (verbose)
480                         printf("Compile %s for %s, status %i: %s\n",
481                                status ? "fail" : "warning",
482                                test->name, status, output);
483                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
484                         errx(1, "Test for %s did not compile:\n%s",
485                              test->name, output);
486                 test->answer = false;
487                 free(output);
488         } else {
489                 /* Compile succeeded. */
490                 free(output);
491                 /* We run INSIDE_MAIN tests for sanity checking. */
492                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
493                         output = run("./" OUTPUT_FILE, &status);
494                         if (!(test->style & EXECUTE) && status != 0)
495                                 errx(1, "Test for %s failed with %i:\n%s",
496                                      test->name, status, output);
497                         if (verbose && status)
498                                 printf("%s exited %i\n", test->name, status);
499                         free(output);
500                 }
501                 test->answer = (status == 0);
502         }
503         test->done = true;
504
505         if (test->answer && test->overrides) {
506                 struct test *override = find_test(test->overrides);
507                 override->done = true;
508                 override->answer = true;
509         }
510         return test->answer;
511 }
512
513 int main(int argc, const char *argv[])
514 {
515         char *cmd;
516         unsigned int i;
517         const char *default_args[]
518                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
519
520         if (argc > 1) {
521                 if (strcmp(argv[1], "--help") == 0) {
522                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
523                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
524                                "Default: %s %s\n",
525                                DEFAULT_COMPILER, DEFAULT_FLAGS);
526                         exit(0);
527                 }
528                 if (strcmp(argv[1], "-v") == 0) {
529                         argc--;
530                         argv++;
531                         verbose = 1;
532                 } else if (strcmp(argv[1], "-vv") == 0) {
533                         argc--;
534                         argv++;
535                         verbose = 2;
536                 }
537         }
538
539         if (argc == 1)
540                 argv = default_args;
541
542         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
543         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
544                 run_test(cmd, &tests[i]);
545
546         unlink(OUTPUT_FILE);
547         unlink(INPUT_FILE);
548
549         printf("/* Generated by CCAN configurator */\n"
550                "#ifndef CCAN_CONFIG_H\n"
551                "#define CCAN_CONFIG_H\n");
552         printf("#ifndef _GNU_SOURCE\n");
553         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
554         printf("#endif\n");
555         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
556         printf("#define CCAN_CFLAGS \"%s\"\n\n", connect_args(argv+1, ""));
557         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
558         printf("#define HAVE_CCAN 1\n");
559         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
560                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
561         printf("#endif /* CCAN_CONFIG_H */\n");
562         return 0;
563 }