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_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
118 "return __builtin_constant_p(1) ? 0 : 1;" },
119 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
120 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
121 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
122 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
123 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
124 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
125 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
126 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
127 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
128 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
129 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
130 "#include <byteswap.h>\n" },
131 { "HAVE_CLOCK_GETTIME",
132 DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
133 "#include <time.h>\n"
134 "static struct timespec func(void) {\n"
135 " struct timespec ts;\n"
136 " clock_gettime(CLOCK_REALTIME, &ts);\n"
139 { "HAVE_CLOCK_GETTIME_IN_LIBRT",
141 "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
143 "#include <time.h>\n"
144 "static struct timespec func(void) {\n"
145 " struct timespec ts;\n"
146 " clock_gettime(CLOCK_REALTIME, &ts);\n"
149 /* This means HAVE_CLOCK_GETTIME, too */
150 "HAVE_CLOCK_GETTIME" },
151 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
152 "int *foo = (int[]) { 1, 2, 3, 4 };\n"
153 "return foo[0] ? 0 : 1;" },
154 { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
155 "#include <sys/types.h>\n"
156 "#include <sys/stat.h>\n"
157 "#include <fcntl.h>\n"
158 "#include <unistd.h>\n"
160 " int fd = open(\"..\", O_RDONLY);\n"
161 " return fchdir(fd) == 0 ? 0 : 1;\n"
163 { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
165 "static void func(int arg) {\n"
167 " err(1, \"err %u\", arg);\n"
169 " errx(1, \"err %u\", arg);\n"
171 " warn(\"warn %u\", arg);\n"
173 " warnx(\"warn %u\", arg);\n"
175 { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
176 "HAVE_32BIT_OFF_T", NULL,
177 "#define _FILE_OFFSET_BITS 64\n"
178 "#include <sys/types.h>\n"
179 "int main(int argc, char *argv[]) {\n"
180 " return sizeof(off_t) == 8 ? 0 : 1;\n"
182 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
183 "for (int i = 0; i < argc; i++) { return 0; };\n"
185 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
186 "struct foo { unsigned int x; int arr[]; };" },
187 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
188 "#include <unistd.h>\n"
189 "static int func(void) { return getpagesize(); }" },
190 { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
191 "#define _GNU_SOURCE\n"
192 "#include <ctype.h>\n"
193 "static int func(void) { return isblank(' '); }" },
194 { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
195 "union { int i; char c[sizeof(int)]; } u;\n"
196 "u.i = 0x01020304;\n"
197 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
198 { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
199 "#define _GNU_SOURCE\n"
200 "#include <string.h>\n"
201 "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
202 "return memmem(h, hl, n, nl);"
204 { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
205 "#include <sys/mman.h>\n"
206 "static void *func(int fd) {\n"
207 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
209 { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
210 "#include <sys/types.h>\n"
211 "#include <sys/stat.h>\n"
212 "#include <fcntl.h>\n"
214 " return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
216 { "HAVE_QSORT_R_PRIVATE_LAST",
217 DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
218 "#define _GNU_SOURCE 1\n"
219 "#include <stdlib.h>\n"
220 "static int cmp(const void *lp, const void *rp, void *priv) {\n"
221 " *(unsigned int *)priv = 1;\n"
222 " return *(const int *)lp - *(const int *)rp; }\n"
224 " int array[] = { 9, 2, 5 };\n"
225 " unsigned int called = 0;\n"
226 " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
227 " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
229 { "HAVE_STRUCT_TIMESPEC",
230 DEFINES_FUNC, NULL, NULL,
231 "#include <time.h>\n"
232 "static void func(void) {\n"
233 " struct timespec ts;\n"
234 " ts.tv_sec = ts.tv_nsec = 1;\n"
236 { "HAVE_SECTION_START_STOP",
237 DEFINES_FUNC, NULL, NULL,
238 "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
239 "static int func(void) {\n"
240 " extern void *__start_mysec[], *__stop_mysec[];\n"
241 " return __stop_mysec - __start_mysec;\n"
243 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
244 "static long nest(const void *base, unsigned int i)\n"
247 " return (const char *)&i - (const char *)base;\n"
248 " return nest(base, i-1);\n"
250 "int main(int argc, char *argv[]) {\n"
251 " return (nest(&argc, argc) > 0) ? 0 : 1\n;"
253 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
254 "return ({ int x = argc; x == argc ? 0 : 1; });" },
255 { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
256 "#include <sys/filio.h>\n" },
257 { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
258 "#include <sys/termios.h>\n" },
259 { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
260 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
261 { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
262 "#include <sys/types.h>\n"
263 "#include <utime.h>\n"
264 "static int func(const char *filename) {\n"
265 " struct utimbuf times = { 0 };\n"
266 " return utime(filename, ×);\n"
268 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
269 "#include <sys/types.h>\n"
270 "#include <utime.h>\n"
271 "static __attribute__((warn_unused_result)) int func(int i) {\n"
276 static char *grab_fd(int fd)
279 size_t max, size = 0;
283 buffer = malloc(max+1);
284 while ((ret = read(fd, buffer + size, max - size)) > 0) {
287 buffer = realloc(buffer, max *= 2);
290 err(1, "reading from command");
295 static char *run(const char *cmd, int *exitstatus)
303 err(1, "creating pipe");
310 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
311 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
313 || close(STDIN_FILENO) != 0
314 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
317 status = system(cmd);
318 if (WIFEXITED(status))
319 exit(WEXITSTATUS(status));
320 /* Here's a hint... */
321 exit(128 + WTERMSIG(status));
326 /* This shouldn't fail... */
327 if (waitpid(pid, &status, 0) != pid)
328 err(1, "Failed to wait for child");
330 if (WIFEXITED(status))
331 *exitstatus = WEXITSTATUS(status);
333 *exitstatus = -WTERMSIG(status);
337 static char *connect_args(const char *argv[], const char *extra)
339 unsigned int i, len = strlen(extra) + 1;
342 for (i = 1; argv[i]; i++)
343 len += 1 + strlen(argv[i]);
347 for (i = 1; argv[i]; i++) {
348 strcpy(ret + len, argv[i]);
349 len += strlen(argv[i]);
353 strcpy(ret + len, extra);
357 static struct test *find_test(const char *name)
361 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
362 if (strcmp(tests[i].name, name) == 0)
368 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
369 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
370 #define USE_FUNC_BOILERPLATE "(void)func;\n"
371 #define MAIN_BODY_BOILERPLATE "return 0;\n"
372 #define MAIN_END_BOILERPLATE "}\n"
374 static bool run_test(const char *cmd, struct test *test)
385 const char *deps = test->depends;
388 /* Space-separated dependencies, could be ! for inverse. */
389 while ((len = strcspn(deps, " "))) {
390 bool positive = true;
402 if (run_test(cmd, find_test(dep)) != positive) {
403 test->answer = false;
408 deps += strspn(deps, " ");
412 outf = fopen(INPUT_FILE, "w");
414 err(1, "creating %s", INPUT_FILE);
416 fprintf(outf, "%s", PRE_BOILERPLATE);
417 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
419 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
420 fprintf(outf, "%s", test->fragment);
421 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
424 fprintf(outf, "%s", test->fragment);
425 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
426 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
427 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
430 fprintf(outf, "%s", test->fragment);
431 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
432 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
433 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
434 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
436 case DEFINES_EVERYTHING:
437 fprintf(outf, "%s", test->fragment);
446 if (system("cat " INPUT_FILE) == -1);
450 newcmd = malloc(strlen(cmd) + strlen(" ")
451 + strlen(test->link) + 1);
452 sprintf(newcmd, "%s %s", cmd, test->link);
454 printf("Extra link line: %s", newcmd);
458 output = run(cmd, &status);
459 if (status != 0 || strstr(output, "warning")) {
461 printf("Compile %s for %s, status %i: %s\n",
462 status ? "fail" : "warning",
463 test->name, status, output);
464 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
465 errx(1, "Test for %s did not compile:\n%s",
467 test->answer = false;
470 /* Compile succeeded. */
472 /* We run INSIDE_MAIN tests for sanity checking. */
473 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
474 output = run("./" OUTPUT_FILE, &status);
475 if (!(test->style & EXECUTE) && status != 0)
476 errx(1, "Test for %s failed with %i:\n%s",
477 test->name, status, output);
478 if (verbose && status)
479 printf("%s exited %i\n", test->name, status);
482 test->answer = (status == 0);
486 if (test->answer && test->overrides) {
487 struct test *override = find_test(test->overrides);
488 override->done = true;
489 override->answer = true;
494 int main(int argc, const char *argv[])
498 const char *default_args[]
499 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
502 if (strcmp(argv[1], "--help") == 0) {
503 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
504 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
506 DEFAULT_COMPILER, DEFAULT_FLAGS);
509 if (strcmp(argv[1], "-v") == 0) {
513 } else if (strcmp(argv[1], "-vv") == 0) {
523 cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
524 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
525 run_test(cmd, &tests[i]);
530 printf("/* Generated by CCAN configurator */\n"
531 "#ifndef CCAN_CONFIG_H\n"
532 "#define CCAN_CONFIG_H\n");
533 printf("#ifndef _GNU_SOURCE\n");
534 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
536 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
537 printf("#define CCAN_CFLAGS \"%s\"\n\n", connect_args(argv+1, ""));
538 /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
539 printf("#define HAVE_CCAN 1\n");
540 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
541 printf("#define %s %u\n", tests[i].name, tests[i].answer);
542 printf("#endif /* CCAN_CONFIG_H */\n");