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;
58 const char *overrides; /* On success, force this to '1' */
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"
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) {"
76 " if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
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) {"
100 " return backtrace(bt, 10) < x;\n"
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"
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"
152 { "HAVE_CLOCK_GETTIME_IN_LIBRT",
154 "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
156 "#include <time.h>\n"
157 "static struct timespec func(void) {\n"
158 " struct timespec ts;\n"
159 " clock_gettime(CLOCK_REALTIME, &ts);\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"
173 " int fd = open(\"..\", O_RDONLY);\n"
174 " return fchdir(fd) == 0 ? 0 : 1;\n"
176 { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
178 "static void func(int arg) {\n"
180 " err(1, \"err %u\", arg);\n"
182 " errx(1, \"err %u\", arg);\n"
184 " warn(\"warn %u\", arg);\n"
186 " warnx(\"warn %u\", arg);\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"
195 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
196 "for (int i = 0; i < argc; i++) { return 0; };\n"
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);"
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);"
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"
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"
233 " return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\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"
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"
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"
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"
262 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
263 "static long nest(const void *base, unsigned int i)\n"
266 " return (const char *)&i - (const char *)base;\n"
267 " return nest(base, i-1);\n"
269 "int main(int argc, char *argv[]) {\n"
270 " return (nest(&argc, argc) > 0) ? 0 : 1\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_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
281 "#include <string.h>\n"
282 "int main(int argc, char *argv[]) {\n"
283 " char pad[sizeof(int *) * 1];\n"
284 " strncpy(pad, argv[0], sizeof(pad));\n"
285 " return *(int *)(pad) == *(int *)(pad + 1);\n"
287 { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
288 "#include <sys/types.h>\n"
289 "#include <utime.h>\n"
290 "static int func(const char *filename) {\n"
291 " struct utimbuf times = { 0 };\n"
292 " return utime(filename, ×);\n"
294 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
295 "#include <sys/types.h>\n"
296 "#include <utime.h>\n"
297 "static __attribute__((warn_unused_result)) int func(int i) {\n"
302 static char *grab_fd(int fd)
305 size_t max, size = 0;
309 buffer = malloc(max+1);
310 while ((ret = read(fd, buffer + size, max - size)) > 0) {
313 buffer = realloc(buffer, max *= 2);
316 err(1, "reading from command");
321 static char *run(const char *cmd, int *exitstatus)
329 err(1, "creating pipe");
336 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
337 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
339 || close(STDIN_FILENO) != 0
340 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
343 status = system(cmd);
344 if (WIFEXITED(status))
345 exit(WEXITSTATUS(status));
346 /* Here's a hint... */
347 exit(128 + WTERMSIG(status));
352 /* This shouldn't fail... */
353 if (waitpid(pid, &status, 0) != pid)
354 err(1, "Failed to wait for child");
356 if (WIFEXITED(status))
357 *exitstatus = WEXITSTATUS(status);
359 *exitstatus = -WTERMSIG(status);
363 static char *connect_args(const char *argv[], const char *extra)
365 unsigned int i, len = strlen(extra) + 1;
368 for (i = 1; argv[i]; i++)
369 len += 1 + strlen(argv[i]);
373 for (i = 1; argv[i]; i++) {
374 strcpy(ret + len, argv[i]);
375 len += strlen(argv[i]);
379 strcpy(ret + len, extra);
383 static struct test *find_test(const char *name)
387 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
388 if (strcmp(tests[i].name, name) == 0)
394 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
395 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
396 #define USE_FUNC_BOILERPLATE "(void)func;\n"
397 #define MAIN_BODY_BOILERPLATE "return 0;\n"
398 #define MAIN_END_BOILERPLATE "}\n"
400 static bool run_test(const char *cmd, struct test *test)
411 const char *deps = test->depends;
414 /* Space-separated dependencies, could be ! for inverse. */
415 while ((len = strcspn(deps, " "))) {
416 bool positive = true;
428 if (run_test(cmd, find_test(dep)) != positive) {
429 test->answer = false;
434 deps += strspn(deps, " ");
438 outf = fopen(INPUT_FILE, "w");
440 err(1, "creating %s", INPUT_FILE);
442 fprintf(outf, "%s", PRE_BOILERPLATE);
443 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
445 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
446 fprintf(outf, "%s", test->fragment);
447 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
450 fprintf(outf, "%s", test->fragment);
451 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
452 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
453 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
456 fprintf(outf, "%s", test->fragment);
457 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
458 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
459 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
460 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
462 case DEFINES_EVERYTHING:
463 fprintf(outf, "%s", test->fragment);
472 if (system("cat " INPUT_FILE) == -1);
476 newcmd = malloc(strlen(cmd) + strlen(" ")
477 + strlen(test->link) + 1);
478 sprintf(newcmd, "%s %s", cmd, test->link);
480 printf("Extra link line: %s", newcmd);
484 output = run(cmd, &status);
485 if (status != 0 || strstr(output, "warning")) {
487 printf("Compile %s for %s, status %i: %s\n",
488 status ? "fail" : "warning",
489 test->name, status, output);
490 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
491 errx(1, "Test for %s did not compile:\n%s",
493 test->answer = false;
496 /* Compile succeeded. */
498 /* We run INSIDE_MAIN tests for sanity checking. */
499 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
500 output = run("./" OUTPUT_FILE, &status);
501 if (!(test->style & EXECUTE) && status != 0)
502 errx(1, "Test for %s failed with %i:\n%s",
503 test->name, status, output);
504 if (verbose && status)
505 printf("%s exited %i\n", test->name, status);
508 test->answer = (status == 0);
512 if (test->answer && test->overrides) {
513 struct test *override = find_test(test->overrides);
514 override->done = true;
515 override->answer = true;
520 int main(int argc, const char *argv[])
524 const char *default_args[]
525 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
528 if (strcmp(argv[1], "--help") == 0) {
529 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
530 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
532 DEFAULT_COMPILER, DEFAULT_FLAGS);
535 if (strcmp(argv[1], "-v") == 0) {
539 } else if (strcmp(argv[1], "-vv") == 0) {
549 cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
550 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
551 run_test(cmd, &tests[i]);
556 printf("/* Generated by CCAN configurator */\n"
557 "#ifndef CCAN_CONFIG_H\n"
558 "#define CCAN_CONFIG_H\n");
559 printf("#ifndef _GNU_SOURCE\n");
560 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
562 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
563 printf("#define CCAN_CFLAGS \"%s\"\n\n", connect_args(argv+1, ""));
564 /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
565 printf("#define HAVE_CCAN 1\n");
566 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
567 printf("#define %s %u\n", tests[i].name, tests[i].answer);
568 printf("#endif /* CCAN_CONFIG_H */\n");