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;
62 static struct test tests[] = {
63 { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
64 "#include <sys/types.h>\n"
65 "int main(int argc, char *argv[]) {\n"
66 " return sizeof(off_t) == 4 ? 0 : 1;\n"
68 { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
69 "return __alignof__(double) > 0 ? 0 : 1;" },
70 { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
71 "#define _GNU_SOURCE\n"
72 "#include <stdio.h>\n"
73 "static char *func(int x) {"
75 " if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
78 { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
79 "static int __attribute__((cold)) func(int x) { return x; }" },
80 { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
81 "static int __attribute__((const)) func(int x) { return x; }" },
82 { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
83 "static int __attribute__((pure)) func(int x) { return x; }" },
84 { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
85 "typedef short __attribute__((__may_alias__)) short_a;" },
86 { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
87 "#include <stdlib.h>\n"
88 "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
89 { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
90 "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
91 { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
92 "static int __attribute__((unused)) func(int x) { return x; }" },
93 { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
94 "static int __attribute__((used)) func(int x) { return x; }" },
95 { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
96 "#include <execinfo.h>\n"
97 "static int func(int x) {"
99 " return backtrace(bt, 10) < x;\n"
101 { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
102 "union { int i; char c[sizeof(int)]; } u;\n"
103 "u.i = 0x01020304;\n"
104 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
105 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
106 "#include <byteswap.h>\n"
107 "static int func(int x) { return bswap_64(x); }" },
108 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
109 "return __builtin_choose_expr(1, 0, \"garbage\");" },
110 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
111 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
112 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
113 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
114 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
115 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
116 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
117 "return __builtin_constant_p(1) ? 0 : 1;" },
118 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
119 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
120 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
121 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
122 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
123 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
124 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
125 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
126 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
127 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
128 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
129 "#include <byteswap.h>\n" },
130 { "HAVE_CLOCK_GETTIME",
131 DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
132 "#include <time.h>\n"
133 "static struct timespec func(void) {\n"
134 " struct timespec ts;\n"
135 " clock_gettime(CLOCK_REALTIME, &ts);\n"
138 { "HAVE_CLOCK_GETTIME_IN_LIBRT",
140 "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
142 "#include <time.h>\n"
143 "static struct timespec func(void) {\n"
144 " struct timespec ts;\n"
145 " clock_gettime(CLOCK_REALTIME, &ts);\n"
148 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
149 "int *foo = (int[]) { 1, 2, 3, 4 };\n"
150 "return foo[0] ? 0 : 1;" },
151 { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
152 "#include <sys/types.h>\n"
153 "#include <sys/stat.h>\n"
154 "#include <fcntl.h>\n"
155 "#include <unistd.h>\n"
157 " int fd = open(\"..\", O_RDONLY);\n"
158 " return fchdir(fd) == 0 ? 0 : 1;\n"
160 { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
162 "static void func(int arg) {\n"
164 " err(1, \"err %u\", arg);\n"
166 " errx(1, \"err %u\", arg);\n"
168 " warn(\"warn %u\", arg);\n"
170 " warnx(\"warn %u\", arg);\n"
172 { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
173 "HAVE_32BIT_OFF_T", NULL,
174 "#define _FILE_OFFSET_BITS 64\n"
175 "#include <sys/types.h>\n"
176 "int main(int argc, char *argv[]) {\n"
177 " return sizeof(off_t) == 8 ? 0 : 1;\n"
179 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
180 "for (int i = 0; i < argc; i++) { return 0; };\n"
182 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
183 "struct foo { unsigned int x; int arr[]; };" },
184 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
185 "#include <unistd.h>\n"
186 "static int func(void) { return getpagesize(); }" },
187 { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
188 "#define _GNU_SOURCE\n"
189 "#include <ctype.h>\n"
190 "static int func(void) { return isblank(' '); }" },
191 { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
192 "union { int i; char c[sizeof(int)]; } u;\n"
193 "u.i = 0x01020304;\n"
194 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
195 { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
196 "#define _GNU_SOURCE\n"
197 "#include <string.h>\n"
198 "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
199 "return memmem(h, hl, n, nl);"
201 { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
202 "#include <sys/mman.h>\n"
203 "static void *func(int fd) {\n"
204 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
206 { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
207 "#include <sys/types.h>\n"
208 "#include <sys/stat.h>\n"
209 "#include <fcntl.h>\n"
211 " return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
213 { "HAVE_QSORT_R_PRIVATE_LAST",
214 DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
215 "#define _GNU_SOURCE 1\n"
216 "#include <stdlib.h>\n"
217 "static int cmp(const void *lp, const void *rp, void *priv) {\n"
218 " *(unsigned int *)priv = 1;\n"
219 " return *(const int *)lp - *(const int *)rp; }\n"
221 " int array[] = { 9, 2, 5 };\n"
222 " unsigned int called = 0;\n"
223 " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
224 " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
226 { "HAVE_STRUCT_TIMESPEC",
227 DEFINES_FUNC, NULL, NULL,
228 "#include <time.h>\n"
229 "static void func(void) {\n"
230 " struct timespec ts;\n"
231 " ts.tv_sec = ts.tv_nsec = 1;\n"
233 { "HAVE_SECTION_START_STOP",
234 DEFINES_FUNC, NULL, NULL,
235 "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
236 "static int func(void) {\n"
237 " extern void *__start_mysec[], *__stop_mysec[];\n"
238 " return __stop_mysec - __start_mysec;\n"
240 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
241 "static long nest(const void *base, unsigned int i)\n"
244 " return (const char *)&i - (const char *)base;\n"
245 " return nest(base, i-1);\n"
247 "int main(int argc, char *argv[]) {\n"
248 " return (nest(&argc, argc) > 0) ? 0 : 1\n;"
250 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
251 "return ({ int x = argc; x == argc ? 0 : 1; });" },
252 { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
253 "#include <sys/filio.h>\n" },
254 { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
255 "#include <sys/termios.h>\n" },
256 { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
257 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
258 { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
259 "#include <sys/types.h>\n"
260 "#include <utime.h>\n"
261 "static int func(const char *filename) {\n"
262 " struct utimbuf times = { 0 };\n"
263 " return utime(filename, ×);\n"
265 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
266 "#include <sys/types.h>\n"
267 "#include <utime.h>\n"
268 "static __attribute__((warn_unused_result)) int func(int i) {\n"
273 static char *grab_fd(int fd)
276 size_t max, size = 0;
280 buffer = malloc(max+1);
281 while ((ret = read(fd, buffer + size, max - size)) > 0) {
284 buffer = realloc(buffer, max *= 2);
287 err(1, "reading from command");
292 static char *run(const char *cmd, int *exitstatus)
300 err(1, "creating pipe");
307 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
308 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
310 || close(STDIN_FILENO) != 0
311 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
314 status = system(cmd);
315 if (WIFEXITED(status))
316 exit(WEXITSTATUS(status));
317 /* Here's a hint... */
318 exit(128 + WTERMSIG(status));
323 /* This shouldn't fail... */
324 if (waitpid(pid, &status, 0) != pid)
325 err(1, "Failed to wait for child");
327 if (WIFEXITED(status))
328 *exitstatus = WEXITSTATUS(status);
330 *exitstatus = -WTERMSIG(status);
334 static char *connect_args(const char *argv[], const char *extra)
336 unsigned int i, len = strlen(extra) + 1;
339 for (i = 1; argv[i]; i++)
340 len += 1 + strlen(argv[i]);
344 for (i = 1; argv[i]; i++) {
345 strcpy(ret + len, argv[i]);
346 len += strlen(argv[i]);
350 strcpy(ret + len, extra);
354 static struct test *find_test(const char *name)
358 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
359 if (strcmp(tests[i].name, name) == 0)
365 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
366 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
367 #define USE_FUNC_BOILERPLATE "(void)func;\n"
368 #define MAIN_BODY_BOILERPLATE "return 0;\n"
369 #define MAIN_END_BOILERPLATE "}\n"
371 static bool run_test(const char *cmd, struct test *test)
382 const char *deps = test->depends;
385 /* Space-separated dependencies, could be ! for inverse. */
386 while ((len = strcspn(deps, " "))) {
387 bool positive = true;
399 if (run_test(cmd, find_test(dep)) != positive) {
400 test->answer = false;
405 deps += strspn(deps, " ");
409 outf = fopen(INPUT_FILE, "w");
411 err(1, "creating %s", INPUT_FILE);
413 fprintf(outf, "%s", PRE_BOILERPLATE);
414 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
416 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
417 fprintf(outf, "%s", test->fragment);
418 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
421 fprintf(outf, "%s", test->fragment);
422 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
423 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
424 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
427 fprintf(outf, "%s", test->fragment);
428 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
429 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
430 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
431 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
433 case DEFINES_EVERYTHING:
434 fprintf(outf, "%s", test->fragment);
443 if (system("cat " INPUT_FILE) == -1);
447 newcmd = malloc(strlen(cmd) + strlen(" ")
448 + strlen(test->link) + 1);
449 sprintf(newcmd, "%s %s", cmd, test->link);
451 printf("Extra link line: %s", newcmd);
455 output = run(cmd, &status);
456 if (status != 0 || strstr(output, "warning")) {
458 printf("Compile %s for %s, status %i: %s\n",
459 status ? "fail" : "warning",
460 test->name, status, output);
461 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
462 errx(1, "Test for %s did not compile:\n%s",
464 test->answer = false;
467 /* Compile succeeded. */
469 /* We run INSIDE_MAIN tests for sanity checking. */
470 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
471 output = run("./" OUTPUT_FILE, &status);
472 if (!(test->style & EXECUTE) && status != 0)
473 errx(1, "Test for %s failed with %i:\n%s",
474 test->name, status, output);
475 if (verbose && status)
476 printf("%s exited %i\n", test->name, status);
479 test->answer = (status == 0);
485 int main(int argc, const char *argv[])
489 const char *default_args[]
490 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
493 if (strcmp(argv[1], "--help") == 0) {
494 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
495 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
497 DEFAULT_COMPILER, DEFAULT_FLAGS);
500 if (strcmp(argv[1], "-v") == 0) {
504 } else if (strcmp(argv[1], "-vv") == 0) {
514 cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
515 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
516 run_test(cmd, &tests[i]);
521 printf("/* Generated by CCAN configurator */\n"
522 "#ifndef CCAN_CONFIG_H\n"
523 "#define CCAN_CONFIG_H\n");
524 printf("#ifndef _GNU_SOURCE\n");
525 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
527 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
528 printf("#define CCAN_CFLAGS \"%s\"\n\n", connect_args(argv+1, ""));
529 /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
530 printf("#define HAVE_CCAN 1\n");
531 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
532 printf("#define %s %u\n", tests[i].name, tests[i].answer);
533 printf("#endif /* CCAN_CONFIG_H */\n");