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"
47 DEFINES_EVERYTHING = 0x8,
48 MAY_NOT_COMPILE = 0x10,
54 enum test_style style;
59 const char *overrides; /* On success, force this to '1' */
64 static struct test tests[] = {
65 { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
66 "#include <sys/types.h>\n"
68 " return sizeof(off_t) == 4 ? 0 : 1;\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"
76 "#include <stdio.h>\n"
77 "static char *func(int x) {"
79 " if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
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) {"
103 " return backtrace(bt, 10) < x;\n"
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"
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"
155 { "HAVE_CLOCK_GETTIME_IN_LIBRT",
157 "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
159 "#include <time.h>\n"
160 "static struct timespec func(void) {\n"
161 " struct timespec ts;\n"
162 " clock_gettime(CLOCK_REALTIME, &ts);\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"
176 " int fd = open(\"..\", O_RDONLY);\n"
177 " return fchdir(fd) == 0 ? 0 : 1;\n"
179 { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
181 "static void func(int arg) {\n"
183 " err(1, \"err %u\", arg);\n"
185 " errx(1, \"err %u\", arg);\n"
187 " warn(\"warn %u\", arg);\n"
189 " warnx(\"warn %u\", arg);\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"
196 " return sizeof(off_t) == 8 ? 0 : 1;\n"
198 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
199 "for (int i = 0; i < argc; i++) { return 0; };\n"
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"
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"
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);"
224 { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
225 "#ifndef _GNU_SOURCE\n"
226 "#define _GNU_SOURCE\n"
228 "#include <string.h>\n"
229 "static void *func(void *s, int c, size_t n) {\n"
230 "return memrchr(s, c, 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"
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"
242 " return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\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"
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"
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"
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"
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"
273 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
274 "static long nest(const void *base, unsigned int i)\n"
277 " return (const char *)&i - (const char *)base;\n"
278 " return nest(base, i-1);\n"
280 "int main(int argc, char *argv[]) {\n"
282 " return (nest(&argc, argc) > 0) ? 0 : 1;\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"
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"
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, ×);\n"
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"
314 { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
316 "#pragma omp parallel for\n"
317 "for(i = 0; i < 0; i++) {};\n"
319 "-Werror -fopenmp" },
320 { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
321 "#include <valgrind/memcheck.h>\n" },
322 { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE,
324 "#include <ucontext.h>\n"
325 "static int x = 0;\n"
326 "static char stack[2048];\n"
327 "static ucontext_t a, b;\n"
328 "static void fn(void) {\n"
333 "int main(int argc, char *argv[]) {\n"
336 " a.uc_stack.ss_sp = stack;\n"
337 " a.uc_stack.ss_size = sizeof(stack);\n"
338 " makecontext(&a, fn, 0);\n"
339 " swapcontext(&b, &a);\n"
340 " return (x == 3) ? 0 : 1;\n"
343 { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE,
344 "HAVE_UCONTEXT", NULL,
345 "#include <stddef.h>\n"
346 "#include <ucontext.h>\n"
347 "static int worked = 0;\n"
348 "static char stack[1024];\n"
349 "static ucontext_t a, b;\n"
350 "static void fn(void *p, void *q) {\n"
351 " void *cp = &worked;\n"
352 " void *cq = (void *)(~((ptrdiff_t)cp));\n"
353 " if ((p == cp) && (q == cq))\n"
357 "int main(int argc, char *argv[]) {\n"
358 " void *ap = &worked;\n"
359 " void *aq = (void *)(~((ptrdiff_t)ap));\n"
361 " a.uc_stack.ss_sp = stack;\n"
362 " a.uc_stack.ss_size = sizeof(stack);\n"
363 " makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
364 " swapcontext(&b, &a);\n"
365 " return worked ? 0 : 1;\n"
370 static char *grab_fd(int fd)
373 size_t max, size = 0;
377 buffer = malloc(max+1);
378 while ((ret = read(fd, buffer + size, max - size)) > 0) {
381 buffer = realloc(buffer, max *= 2);
384 err(1, "reading from command");
389 static char *run(const char *cmd, int *exitstatus)
397 err(1, "creating pipe");
404 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
405 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
407 || close(STDIN_FILENO) != 0
408 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
411 status = system(cmd);
412 if (WIFEXITED(status))
413 exit(WEXITSTATUS(status));
414 /* Here's a hint... */
415 exit(128 + WTERMSIG(status));
420 /* This shouldn't fail... */
421 if (waitpid(pid, &status, 0) != pid)
422 err(1, "Failed to wait for child");
424 if (WIFEXITED(status))
425 *exitstatus = WEXITSTATUS(status);
427 *exitstatus = -WTERMSIG(status);
431 static char *connect_args(const char *argv[], const char *extra)
433 unsigned int i, len = strlen(extra) + 1;
436 for (i = 1; argv[i]; i++)
437 len += 1 + strlen(argv[i]);
441 for (i = 1; argv[i]; i++) {
442 strcpy(ret + len, argv[i]);
443 len += strlen(argv[i]);
447 strcpy(ret + len, extra);
451 static struct test *find_test(const char *name)
455 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
456 if (strcmp(tests[i].name, name) == 0)
462 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
463 #define MAIN_START_BOILERPLATE \
464 "int main(int argc, char *argv[]) {\n" \
467 #define USE_FUNC_BOILERPLATE "(void)func;\n"
468 #define MAIN_BODY_BOILERPLATE "return 0;\n"
469 #define MAIN_END_BOILERPLATE "}\n"
471 static bool run_test(const char *cmd, struct test *test)
473 char *output, *newcmd;
482 const char *deps = test->depends;
485 /* Space-separated dependencies, could be ! for inverse. */
486 while ((len = strcspn(deps, " "))) {
487 bool positive = true;
499 if (run_test(cmd, find_test(dep)) != positive) {
500 test->answer = false;
508 deps += strspn(deps, " ");
512 outf = fopen(INPUT_FILE, "w");
514 err(1, "creating %s", INPUT_FILE);
516 fprintf(outf, "%s", PRE_BOILERPLATE);
517 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
519 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
520 fprintf(outf, "%s", test->fragment);
521 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
524 fprintf(outf, "%s", test->fragment);
525 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
526 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
527 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
530 fprintf(outf, "%s", test->fragment);
531 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
532 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
533 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
534 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
536 case DEFINES_EVERYTHING:
537 fprintf(outf, "%s", test->fragment);
546 if (system("cat " INPUT_FILE) == -1)
549 newcmd = strdup(cmd);
552 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
553 + strlen(test->flags) + 1);
555 strcat(newcmd, test->flags);
557 printf("Extra flags line: %s", newcmd);
561 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
562 + strlen(test->link) + 1);
564 strcat(newcmd, test->link);
566 printf("Extra link line: %s", newcmd);
569 output = run(newcmd, &status);
573 if (status != 0 || strstr(output, "warning")) {
575 printf("Compile %s for %s, status %i: %s\n",
576 status ? "fail" : "warning",
577 test->name, status, output);
578 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
579 errx(1, "Test for %s did not compile:\n%s",
581 test->answer = false;
584 /* Compile succeeded. */
586 /* We run INSIDE_MAIN tests for sanity checking. */
587 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
588 output = run("./" OUTPUT_FILE, &status);
589 if (!(test->style & EXECUTE) && status != 0)
590 errx(1, "Test for %s failed with %i:\n%s",
591 test->name, status, output);
592 if (verbose && status)
593 printf("%s exited %i\n", test->name, status);
596 test->answer = (status == 0);
600 if (test->answer && test->overrides) {
601 struct test *override = find_test(test->overrides);
602 override->done = true;
603 override->answer = true;
608 int main(int argc, const char *argv[])
612 const char *default_args[]
613 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
616 if (strcmp(argv[1], "--help") == 0) {
617 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
618 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
620 DEFAULT_COMPILER, DEFAULT_FLAGS);
623 if (strcmp(argv[1], "-v") == 0) {
627 } else if (strcmp(argv[1], "-vv") == 0) {
637 cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
638 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
639 run_test(cmd, &tests[i]);
645 printf("/* Generated by CCAN configurator */\n"
646 "#ifndef CCAN_CONFIG_H\n"
647 "#define CCAN_CONFIG_H\n");
648 printf("#ifndef _GNU_SOURCE\n");
649 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
651 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
652 cmd = connect_args(argv+1, "");
653 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
655 /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
656 printf("#define HAVE_CCAN 1\n");
657 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
658 printf("#define %s %u\n", tests[i].name, tests[i].answer);
659 printf("#endif /* CCAN_CONFIG_H */\n");