1 /* Simple tool to create config.h.
2 * Would be much easier with ccan modules, but deliberately standalone.
4 * Copyright 2011 Rusty Russell <rusty@rustcorp.com.au>. MIT license.
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
29 #include <sys/types.h>
35 #define DEFAULT_COMPILER "cc"
36 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
38 #define OUTPUT_FILE "configurator.out"
39 #define INPUT_FILE "configuratortest.c"
53 DEFINES_EVERYTHING = 0x8,
54 MAY_NOT_COMPILE = 0x10,
60 enum test_style style;
65 const char *overrides; /* On success, force this to '1' */
70 static struct test tests[] = {
71 { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
72 "#include <sys/types.h>\n"
74 " return sizeof(off_t) == 4 ? 0 : 1;\n"
76 { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
77 "return __alignof__(double) > 0 ? 0 : 1;" },
78 { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
79 "#ifndef _GNU_SOURCE\n"
80 "#define _GNU_SOURCE\n"
82 "#include <stdio.h>\n"
83 "static char *func(int x) {"
85 " if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
88 { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
89 "static int __attribute__((cold)) func(int x) { return x; }" },
90 { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
91 "static int __attribute__((const)) func(int x) { return x; }" },
92 { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
93 "static int __attribute__((pure)) func(int x) { return x; }" },
94 { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
95 "typedef short __attribute__((__may_alias__)) short_a;" },
96 { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
97 "#include <stdlib.h>\n"
98 "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
99 { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
100 "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
101 { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
102 "static int __attribute__((unused)) func(int x) { return x; }" },
103 { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
104 "static int __attribute__((used)) func(int x) { return x; }" },
105 { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
106 "#include <execinfo.h>\n"
107 "static int func(int x) {"
109 " return backtrace(bt, 10) < x;\n"
111 { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
112 "union { int i; char c[sizeof(int)]; } u;\n"
113 "u.i = 0x01020304;\n"
114 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
115 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
116 "#include <byteswap.h>\n"
117 "static int func(int x) { return bswap_64(x); }" },
118 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
119 "return __builtin_choose_expr(1, 0, \"garbage\");" },
120 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
121 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
122 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
123 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
124 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
125 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
126 { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
127 "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
128 { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
129 "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
130 { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
131 "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
132 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
133 "return __builtin_constant_p(1) ? 0 : 1;" },
134 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
135 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
136 { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
137 "return __builtin_ffs(0) == 0 ? 0 : 1;" },
138 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
139 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
140 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
141 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
142 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
143 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
144 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
145 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
146 { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
147 "#include <intrinsics.h>\n"
148 "int func(int v) {\n"
149 " return __CLZ(__RBIT(v));\n"
151 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
152 "#include <byteswap.h>\n" },
153 { "HAVE_CLOCK_GETTIME",
154 DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
155 "#include <time.h>\n"
156 "static struct timespec func(void) {\n"
157 " struct timespec ts;\n"
158 " clock_gettime(CLOCK_REALTIME, &ts);\n"
161 { "HAVE_CLOCK_GETTIME_IN_LIBRT",
163 "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
165 "#include <time.h>\n"
166 "static struct timespec func(void) {\n"
167 " struct timespec ts;\n"
168 " clock_gettime(CLOCK_REALTIME, &ts);\n"
171 /* This means HAVE_CLOCK_GETTIME, too */
172 "HAVE_CLOCK_GETTIME" },
173 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
174 "int *foo = (int[]) { 1, 2, 3, 4 };\n"
175 "return foo[0] ? 0 : 1;" },
176 { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
177 "#include <sys/types.h>\n"
178 "#include <sys/stat.h>\n"
179 "#include <fcntl.h>\n"
180 "#include <unistd.h>\n"
182 " int fd = open(\"..\", O_RDONLY);\n"
183 " return fchdir(fd) == 0 ? 0 : 1;\n"
185 { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
187 "static void func(int arg) {\n"
189 " err(1, \"err %u\", arg);\n"
191 " errx(1, \"err %u\", arg);\n"
193 " warn(\"warn %u\", arg);\n"
195 " warnx(\"warn %u\", arg);\n"
197 { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
198 "HAVE_32BIT_OFF_T", NULL,
199 "#define _FILE_OFFSET_BITS 64\n"
200 "#include <sys/types.h>\n"
202 " return sizeof(off_t) == 8 ? 0 : 1;\n"
204 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
206 "for (int i = 0; i < argc; i++) { ret = 0; };\n"
208 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
209 "struct foo { unsigned int x; int arr[]; };" },
210 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
211 "#include <unistd.h>\n"
212 "static int func(void) { return getpagesize(); }" },
213 { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
214 "#ifndef _GNU_SOURCE\n"
215 "#define _GNU_SOURCE\n"
217 "#include <ctype.h>\n"
218 "static int func(void) { return isblank(' '); }" },
219 { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
220 "union { int i; char c[sizeof(int)]; } u;\n"
221 "u.i = 0x01020304;\n"
222 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
223 { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
224 "#ifndef _GNU_SOURCE\n"
225 "#define _GNU_SOURCE\n"
227 "#include <string.h>\n"
228 "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
229 "return memmem(h, hl, n, nl);"
231 { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
232 "#ifndef _GNU_SOURCE\n"
233 "#define _GNU_SOURCE\n"
235 "#include <string.h>\n"
236 "static void *func(void *s, int c, size_t n) {\n"
237 "return memrchr(s, c, n);"
239 { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
240 "#include <sys/mman.h>\n"
241 "static void *func(int fd) {\n"
242 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
244 { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
245 "#include <sys/types.h>\n"
246 "#include <sys/stat.h>\n"
247 "#include <fcntl.h>\n"
249 " return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
251 { "HAVE_QSORT_R_PRIVATE_LAST",
252 DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
253 "#ifndef _GNU_SOURCE\n"
254 "#define _GNU_SOURCE\n"
256 "#include <stdlib.h>\n"
257 "static int cmp(const void *lp, const void *rp, void *priv) {\n"
258 " *(unsigned int *)priv = 1;\n"
259 " return *(const int *)lp - *(const int *)rp; }\n"
261 " int array[] = { 9, 2, 5 };\n"
262 " unsigned int called = 0;\n"
263 " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
264 " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
266 { "HAVE_STRUCT_TIMESPEC",
267 DEFINES_FUNC, NULL, NULL,
268 "#include <time.h>\n"
269 "static void func(void) {\n"
270 " struct timespec ts;\n"
271 " ts.tv_sec = ts.tv_nsec = 1;\n"
273 { "HAVE_SECTION_START_STOP",
274 DEFINES_FUNC, NULL, NULL,
275 "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
276 "static int func(void) {\n"
277 " extern void *__start_mysec[], *__stop_mysec[];\n"
278 " return __stop_mysec - __start_mysec;\n"
280 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
281 "static long nest(const void *base, unsigned int i)\n"
284 " return (const char *)&i - (const char *)base;\n"
285 " return nest(base, i-1);\n"
287 "int main(int argc, char *argv[]) {\n"
289 " return (nest(&argc, argc) > 0) ? 0 : 1;\n"
291 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
292 "return ({ int x = argc; x == argc ? 0 : 1; });" },
293 { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
294 "#include <sys/filio.h>\n" },
295 { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
296 "#include <sys/termios.h>\n" },
297 { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
298 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
299 { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
300 "#include <string.h>\n"
301 "int main(int argc, char *argv[]) {\n"
303 " char pad[sizeof(int *) * 1];\n"
304 " strncpy(pad, argv[0], sizeof(pad));\n"
305 " int *x = (int *)pad, *y = (int *)(pad + 1);\n"
306 " return *x == *y;\n"
308 { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
309 "#include <sys/types.h>\n"
310 "#include <utime.h>\n"
311 "static int func(const char *filename) {\n"
312 " struct utimbuf times = { 0 };\n"
313 " return utime(filename, ×);\n"
315 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
316 "#include <sys/types.h>\n"
317 "#include <utime.h>\n"
318 "static __attribute__((warn_unused_result)) int func(int i) {\n"
321 { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
323 "#pragma omp parallel for\n"
324 "for(i = 0; i < 0; i++) {};\n"
326 "-Werror -fopenmp" },
327 { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
328 "#include <valgrind/memcheck.h>\n" },
329 { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
331 "#include <ucontext.h>\n"
332 "static int x = 0;\n"
333 "static char stack[2048];\n"
334 "static ucontext_t a, b;\n"
335 "static void fn(void) {\n"
343 " a.uc_stack.ss_sp = stack;\n"
344 " a.uc_stack.ss_size = sizeof(stack);\n"
345 " makecontext(&a, fn, 0);\n"
346 " swapcontext(&b, &a);\n"
347 " return (x == 3) ? 0 : 1;\n"
350 { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
351 "HAVE_UCONTEXT", NULL,
352 "#include <stddef.h>\n"
353 "#include <ucontext.h>\n"
354 "static int worked = 0;\n"
355 "static char stack[1024];\n"
356 "static ucontext_t a, b;\n"
357 "static void fn(void *p, void *q) {\n"
358 " void *cp = &worked;\n"
359 " void *cq = (void *)(~((ptrdiff_t)cp));\n"
360 " if ((p == cp) && (q == cq))\n"
365 " void *ap = &worked;\n"
366 " void *aq = (void *)(~((ptrdiff_t)ap));\n"
368 " a.uc_stack.ss_sp = stack;\n"
369 " a.uc_stack.ss_size = sizeof(stack);\n"
370 " makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
371 " swapcontext(&b, &a);\n"
372 " return worked ? 0 : 1;\n"
377 static char *grab_fd(int fd)
380 size_t max, size = 0;
384 buffer = malloc(max+1);
385 while ((ret = read(fd, buffer + size, max - size)) > 0) {
388 buffer = realloc(buffer, max *= 2);
391 err(1, "reading from command");
396 static char *run(const char *cmd, int *exitstatus)
404 err(1, "creating pipe");
411 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
412 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
414 || close(STDIN_FILENO) != 0
415 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
418 status = system(cmd);
419 if (WIFEXITED(status))
420 exit(WEXITSTATUS(status));
421 /* Here's a hint... */
422 exit(128 + WTERMSIG(status));
427 /* This shouldn't fail... */
428 if (waitpid(pid, &status, 0) != pid)
429 err(1, "Failed to wait for child");
431 if (WIFEXITED(status))
432 *exitstatus = WEXITSTATUS(status);
434 *exitstatus = -WTERMSIG(status);
438 static char *connect_args(const char *argv[], const char *extra)
440 unsigned int i, len = strlen(extra) + 1;
443 for (i = 1; argv[i]; i++)
444 len += 1 + strlen(argv[i]);
448 for (i = 1; argv[i]; i++) {
449 strcpy(ret + len, argv[i]);
450 len += strlen(argv[i]);
454 strcpy(ret + len, extra);
458 static struct test *find_test(const char *name)
462 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
463 if (strcmp(tests[i].name, name) == 0)
469 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
470 #define MAIN_START_BOILERPLATE \
471 "int main(int argc, char *argv[]) {\n" \
474 #define USE_FUNC_BOILERPLATE "(void)func;\n"
475 #define MAIN_BODY_BOILERPLATE "return 0;\n"
476 #define MAIN_END_BOILERPLATE "}\n"
478 static bool run_test(const char *cmd, struct test *test)
480 char *output, *newcmd;
489 const char *deps = test->depends;
492 /* Space-separated dependencies, could be ! for inverse. */
493 while ((len = strcspn(deps, " ")) != 0) {
494 bool positive = true;
506 if (run_test(cmd, find_test(dep)) != positive) {
507 test->answer = false;
515 deps += strspn(deps, " ");
519 outf = fopen(INPUT_FILE, "w");
521 err(1, "creating %s", INPUT_FILE);
523 fprintf(outf, "%s", PRE_BOILERPLATE);
524 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
526 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
527 fprintf(outf, "%s", test->fragment);
528 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
531 fprintf(outf, "%s", test->fragment);
532 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
533 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
534 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
537 fprintf(outf, "%s", test->fragment);
538 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
539 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
540 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
541 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
543 case DEFINES_EVERYTHING:
544 fprintf(outf, "%s", test->fragment);
553 if (system("cat " INPUT_FILE) == -1)
556 newcmd = strdup(cmd);
559 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
560 + strlen(test->flags) + 1);
562 strcat(newcmd, test->flags);
564 printf("Extra flags line: %s", newcmd);
568 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
569 + strlen(test->link) + 1);
571 strcat(newcmd, test->link);
573 printf("Extra link line: %s", newcmd);
576 output = run(newcmd, &status);
580 if (status != 0 || strstr(output, "warning")) {
582 printf("Compile %s for %s, status %i: %s\n",
583 status ? "fail" : "warning",
584 test->name, status, output);
585 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
586 errx(1, "Test for %s did not compile:\n%s",
588 test->answer = false;
591 /* Compile succeeded. */
593 /* We run INSIDE_MAIN tests for sanity checking. */
594 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
595 output = run("." DIR_SEP OUTPUT_FILE, &status);
596 if (!(test->style & EXECUTE) && status != 0)
597 errx(1, "Test for %s failed with %i:\n%s",
598 test->name, status, output);
599 if (verbose && status)
600 printf("%s exited %i\n", test->name, status);
603 test->answer = (status == 0);
607 if (test->answer && test->overrides) {
608 struct test *override = find_test(test->overrides);
609 override->done = true;
610 override->answer = true;
615 int main(int argc, const char *argv[])
619 const char *default_args[]
620 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
623 if (strcmp(argv[1], "--help") == 0) {
624 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
625 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
627 DEFAULT_COMPILER, DEFAULT_FLAGS);
630 if (strcmp(argv[1], "-v") == 0) {
634 } else if (strcmp(argv[1], "-vv") == 0) {
644 cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
645 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
646 run_test(cmd, &tests[i]);
652 printf("/* Generated by CCAN configurator */\n"
653 "#ifndef CCAN_CONFIG_H\n"
654 "#define CCAN_CONFIG_H\n");
655 printf("#ifndef _GNU_SOURCE\n");
656 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
658 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
659 cmd = connect_args(argv+1, "");
660 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
662 /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
663 printf("#define HAVE_CCAN 1\n");
664 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
665 printf("#define %s %u\n", tests[i].name, tests[i].answer);
666 printf("#endif /* CCAN_CONFIG_H */\n");