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;
61 static struct test tests[] = {
62 { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL,
63 "#include <sys/types.h>\n"
64 "int main(int argc, char *argv[]) {\n"
65 " return sizeof(off_t) == 4 ? 0 : 1;\n"
67 { "HAVE_ALIGNOF", INSIDE_MAIN, NULL,
68 "return __alignof__(double) > 0 ? 0 : 1;" },
69 { "HAVE_ASPRINTF", DEFINES_FUNC, NULL,
70 "#define _GNU_SOURCE\n"
71 "#include <stdio.h>\n"
72 "static char *func(int x) {"
74 " if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
77 { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL,
78 "static int __attribute__((cold)) func(int x) { return x; }" },
79 { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
80 "static int __attribute__((const)) func(int x) { return x; }" },
81 { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
82 "typedef short __attribute__((__may_alias__)) short_a;" },
83 { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL,
84 "#include <stdlib.h>\n"
85 "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
86 { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
87 "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
88 { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
89 "static int __attribute__((unused)) func(int x) { return x; }" },
90 { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
91 "static int __attribute__((used)) func(int x) { return x; }" },
92 { "HAVE_BACKTRACE", DEFINES_FUNC, NULL,
93 "#include <execinfo.h>\n"
94 "static int func(int x) {"
96 " return backtrace(bt, 10) < x;\n"
98 { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
99 "union { int i; char c[sizeof(int)]; } u;\n"
100 "u.i = 0x01020304;\n"
101 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
102 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
103 "#include <byteswap.h>\n"
104 "static int func(int x) { return bswap_64(x); }" },
105 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
106 "return __builtin_choose_expr(1, 0, \"garbage\");" },
107 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
108 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
109 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
110 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
111 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
112 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
113 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
114 "return __builtin_constant_p(1) ? 0 : 1;" },
115 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
116 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
117 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
118 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
119 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
120 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
121 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
122 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
123 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
124 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
125 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
126 "#include <byteswap.h>\n" },
127 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
128 "int *foo = (int[]) { 1, 2, 3, 4 };\n"
129 "return foo[0] ? 0 : 1;" },
130 { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
132 "#define _FILE_OFFSET_BITS 64\n"
133 "#include <sys/types.h>\n"
134 "int main(int argc, char *argv[]) {\n"
135 " return sizeof(off_t) == 8 ? 0 : 1;\n"
137 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
138 "for (int i = 0; i < argc; i++) { return 0; };\n"
140 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
141 "struct foo { unsigned int x; int arr[]; };" },
142 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
143 "#include <unistd.h>\n"
144 "static int func(void) { return getpagesize(); }" },
145 { "HAVE_ISBLANK", DEFINES_FUNC, NULL,
146 "#define _GNU_SOURCE\n"
147 "#include <ctype.h>\n"
148 "static int func(void) { return isblank(' '); }" },
149 { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
150 "union { int i; char c[sizeof(int)]; } u;\n"
151 "u.i = 0x01020304;\n"
152 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
153 { "HAVE_MEMMEM", DEFINES_FUNC, NULL,
154 "#define _GNU_SOURCE\n"
155 "#include <string.h>\n"
156 "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
157 "return memmem(h, hl, n, nl);"
159 { "HAVE_MMAP", DEFINES_FUNC, NULL,
160 "#include <sys/mman.h>\n"
161 "static void *func(int fd) {\n"
162 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
164 { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL,
165 "#include <sys/types.h>\n"
166 "#include <sys/stat.h>\n"
167 "#include <sys/fcntl.h>\n"
169 " return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
171 { "HAVE_QSORT_R_PRIVATE_LAST",
172 DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL,
173 "#define _GNU_SOURCE 1\n"
174 "#include <stdlib.h>\n"
175 "static int cmp(const void *lp, const void *rp, void *priv) {\n"
176 " *(unsigned int *)priv = 1;\n"
177 " return *(const int *)lp - *(const int *)rp; }\n"
179 " int array[] = { 9, 2, 5 };\n"
180 " unsigned int called = 0;\n"
181 " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
182 " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
184 { "HAVE_SECTION_START_STOP",
186 "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
187 "static int func(void) {\n"
188 " extern void *__start_mysec[], *__stop_mysec[];\n"
189 " return __stop_mysec - __start_mysec;\n"
191 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL,
192 "static long nest(const void *base, unsigned int i)\n"
195 " return (const char *)&i - (const char *)base;\n"
196 " return nest(base, i-1);\n"
198 "int main(int argc, char *argv[]) {\n"
199 " return (nest(&argc, argc) > 0) ? 0 : 1\n;"
201 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
202 "return ({ int x = argc; x == argc ? 0 : 1; });" },
203 { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
204 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
205 { "HAVE_UTIME", DEFINES_FUNC, NULL,
206 "#include <sys/types.h>\n"
207 "#include <utime.h>\n"
208 "static int func(const char *filename) {\n"
209 " struct utimbuf times = { 0 };\n"
210 " return utime(filename, ×);\n"
212 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
213 "#include <sys/types.h>\n"
214 "#include <utime.h>\n"
215 "static __attribute__((warn_unused_result)) int func(int i) {\n"
220 static char *grab_fd(int fd)
223 size_t max, size = 0;
227 buffer = malloc(max+1);
228 while ((ret = read(fd, buffer + size, max - size)) > 0) {
231 buffer = realloc(buffer, max *= 2);
234 err(1, "reading from command");
239 static char *run(const char *cmd, int *exitstatus)
247 err(1, "creating pipe");
254 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
255 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
257 || close(STDIN_FILENO) != 0
258 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
261 status = system(cmd);
262 if (WIFEXITED(status))
263 exit(WEXITSTATUS(status));
264 /* Here's a hint... */
265 exit(128 + WTERMSIG(status));
270 /* This shouldn't fail... */
271 if (waitpid(pid, &status, 0) != pid)
272 err(1, "Failed to wait for child");
274 if (WIFEXITED(status))
275 *exitstatus = WEXITSTATUS(status);
277 *exitstatus = -WTERMSIG(status);
281 static char *connect_args(const char *argv[], const char *extra)
283 unsigned int i, len = strlen(extra) + 1;
286 for (i = 1; argv[i]; i++)
287 len += 1 + strlen(argv[i]);
291 for (i = 1; argv[i]; i++) {
292 strcpy(ret + len, argv[i]);
293 len += strlen(argv[i]);
296 strcpy(ret + len, extra);
300 static struct test *find_test(const char *name)
304 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
305 if (strcmp(tests[i].name, name) == 0)
311 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
312 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
313 #define USE_FUNC_BOILERPLATE "(void)func;\n"
314 #define MAIN_BODY_BOILERPLATE "return 0;\n"
315 #define MAIN_END_BOILERPLATE "}\n"
317 static bool run_test(const char *cmd, struct test *test)
326 if (test->depends && !run_test(cmd, find_test(test->depends))) {
327 test->answer = false;
332 outf = fopen(INPUT_FILE, "w");
334 err(1, "creating %s", INPUT_FILE);
336 fprintf(outf, "%s", PRE_BOILERPLATE);
337 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
339 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
340 fprintf(outf, "%s", test->fragment);
341 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
344 fprintf(outf, "%s", test->fragment);
345 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
346 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
347 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
350 fprintf(outf, "%s", test->fragment);
351 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
352 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
353 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
354 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
356 case DEFINES_EVERYTHING:
357 fprintf(outf, "%s", test->fragment);
366 if (system("cat " INPUT_FILE) == -1);
368 output = run(cmd, &status);
369 if (status != 0 || strstr(output, "warning")) {
371 printf("Compile %s for %s, status %i: %s\n",
372 status ? "fail" : "warning",
373 test->name, status, output);
374 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
375 errx(1, "Test for %s did not compile:\n%s",
377 test->answer = false;
380 /* Compile succeeded. */
382 /* We run INSIDE_MAIN tests for sanity checking. */
383 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
384 output = run("./" OUTPUT_FILE, &status);
385 if (!(test->style & EXECUTE) && status != 0)
386 errx(1, "Test for %s failed with %i:\n%s",
387 test->name, status, output);
388 if (verbose && status)
389 printf("%s exited %i\n", test->name, status);
392 test->answer = (status == 0);
398 int main(int argc, const char *argv[])
402 const char *default_args[]
403 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
406 if (strcmp(argv[1], "--help") == 0) {
407 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
408 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
410 DEFAULT_COMPILER, DEFAULT_FLAGS);
413 if (strcmp(argv[1], "-v") == 0) {
417 } else if (strcmp(argv[1], "-vv") == 0) {
427 cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
428 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
429 run_test(cmd, &tests[i]);
434 cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
435 printf("/* Generated by CCAN configurator */\n"
436 "#ifndef CCAN_CONFIG_H\n"
437 "#define CCAN_CONFIG_H\n");
438 printf("#ifndef _GNU_SOURCE\n");
439 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
441 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
442 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
443 /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
444 printf("#define HAVE_CCAN 1\n");
445 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
446 printf("#define %s %u\n", tests[i].name, tests[i].answer);
447 printf("#endif /* CCAN_CONFIG_H */\n");