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 "-g -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_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
93 "union { int i; char c[sizeof(int)]; } u;\n"
95 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
96 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
97 "#include <byteswap.h>\n"
98 "static int func(int x) { return bswap_64(x); }" },
99 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
100 "return __builtin_choose_expr(1, 0, \"garbage\");" },
101 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
102 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
103 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
104 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
105 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
106 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
107 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
108 "return __builtin_constant_p(1) ? 0 : 1;" },
109 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
110 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
111 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
112 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
113 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
114 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
115 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
116 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
117 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
118 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
119 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
120 "#include <byteswap.h>\n" },
121 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
122 "int *foo = (int[]) { 1, 2, 3, 4 };\n"
123 "return foo[0] ? 0 : 1;" },
124 { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
126 "#define _FILE_OFFSET_BITS 64\n"
127 "#include <sys/types.h>\n"
128 "int main(int argc, char *argv[]) {\n"
129 " return sizeof(off_t) == 8 ? 0 : 1;\n"
131 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
132 "for (int i = 0; i < argc; i++) { return 0; };\n"
134 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
135 "struct foo { unsigned int x; int arr[]; };" },
136 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
137 "#include <unistd.h>\n"
138 "static int func(void) { return getpagesize(); }" },
139 { "HAVE_ISBLANK", DEFINES_FUNC, NULL,
140 "#define _GNU_SOURCE\n"
141 "#include <ctype.h>\n"
142 "static int func(void) { return isblank(' '); }" },
143 { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
144 "union { int i; char c[sizeof(int)]; } u;\n"
145 "u.i = 0x01020304;\n"
146 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
147 { "HAVE_MEMMEM", DEFINES_FUNC, NULL,
148 "#define _GNU_SOURCE\n"
149 "#include <string.h>\n"
150 "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
151 "return memmem(h, hl, n, nl);"
153 { "HAVE_MMAP", DEFINES_FUNC, NULL,
154 "#include <sys/mman.h>\n"
155 "static void *func(int fd) {\n"
156 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
158 { "HAVE_QSORT_R_PRIVATE_LAST",
159 DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL,
160 "#define _GNU_SOURCE 1\n"
161 "#include <stdlib.h>\n"
162 "static int cmp(const void *lp, const void *rp, void *priv) {\n"
163 " *(unsigned int *)priv = 1;\n"
164 " return *(const int *)lp - *(const int *)rp; }\n"
166 " int array[] = { 9, 2, 5 };\n"
167 " unsigned int called = 0;\n"
168 " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
169 " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
171 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL,
172 "static long nest(const void *base, unsigned int i)\n"
175 " return (const char *)&i - (const char *)base;\n"
176 " return nest(base, i-1);\n"
178 "int main(int argc, char *argv[]) {\n"
179 " return (nest(&argc, argc) > 0) ? 0 : 1\n;"
181 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
182 "return ({ int x = argc; x == argc ? 0 : 1; });" },
183 { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
184 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
185 { "HAVE_UTIME", DEFINES_FUNC, NULL,
186 "#include <sys/types.h>\n"
187 "#include <utime.h>\n"
188 "static int func(const char *filename) {\n"
189 " struct utimbuf times = { 0 };\n"
190 " return utime(filename, ×);\n"
192 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
193 "#include <sys/types.h>\n"
194 "#include <utime.h>\n"
195 "static __attribute__((warn_unused_result)) int func(int i) {\n"
200 static char *grab_fd(int fd)
203 size_t max, size = 0;
207 buffer = malloc(max+1);
208 while ((ret = read(fd, buffer + size, max - size)) > 0) {
211 buffer = realloc(buffer, max *= 2);
214 err(1, "reading from command");
219 static char *run(const char *cmd, int *exitstatus)
227 err(1, "creating pipe");
234 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
235 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
237 || close(STDIN_FILENO) != 0
238 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
241 status = system(cmd);
242 if (WIFEXITED(status))
243 exit(WEXITSTATUS(status));
244 /* Here's a hint... */
245 exit(128 + WTERMSIG(status));
250 /* This shouldn't fail... */
251 if (waitpid(pid, &status, 0) != pid)
252 err(1, "Failed to wait for child");
254 if (WIFEXITED(status))
255 *exitstatus = WEXITSTATUS(status);
257 *exitstatus = -WTERMSIG(status);
261 static char *connect_args(const char *argv[], const char *extra)
263 unsigned int i, len = strlen(extra) + 1;
266 for (i = 1; argv[i]; i++)
267 len += 1 + strlen(argv[i]);
271 for (i = 1; argv[i]; i++) {
272 strcpy(ret + len, argv[i]);
273 len += strlen(argv[i]);
276 strcpy(ret + len, extra);
280 static struct test *find_test(const char *name)
284 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
285 if (strcmp(tests[i].name, name) == 0)
291 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
292 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
293 #define USE_FUNC_BOILERPLATE "(void)func;\n"
294 #define MAIN_BODY_BOILERPLATE "return 0;\n"
295 #define MAIN_END_BOILERPLATE "}\n"
297 static bool run_test(const char *cmd, struct test *test)
306 if (test->depends && !run_test(cmd, find_test(test->depends))) {
307 test->answer = false;
312 outf = fopen(INPUT_FILE, "w");
314 err(1, "creating %s", INPUT_FILE);
316 fprintf(outf, "%s", PRE_BOILERPLATE);
317 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
319 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
320 fprintf(outf, "%s", test->fragment);
321 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
324 fprintf(outf, "%s", test->fragment);
325 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
326 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
327 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
330 fprintf(outf, "%s", test->fragment);
331 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
332 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
333 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
334 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
336 case DEFINES_EVERYTHING:
337 fprintf(outf, "%s", test->fragment);
346 if (system("cat " INPUT_FILE) == -1);
348 output = run(cmd, &status);
349 if (status != 0 || strstr(output, "warning")) {
351 printf("Compile %s for %s, status %i: %s\n",
352 status ? "fail" : "warning",
353 test->name, status, output);
354 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
355 errx(1, "Test for %s did not compile:\n%s",
357 test->answer = false;
360 /* Compile succeeded. */
362 /* We run INSIDE_MAIN tests for sanity checking. */
363 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
364 output = run("./" OUTPUT_FILE, &status);
365 if (!(test->style & EXECUTE) && status != 0)
366 errx(1, "Test for %s failed with %i:\n%s",
367 test->name, status, output);
368 if (verbose && status)
369 printf("%s exited %i\n", test->name, status);
372 test->answer = (status == 0);
378 int main(int argc, const char *argv[])
382 const char *default_args[]
383 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
386 if (strcmp(argv[1], "--help") == 0) {
387 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
388 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
390 DEFAULT_COMPILER, DEFAULT_FLAGS);
393 if (strcmp(argv[1], "-v") == 0) {
397 } else if (strcmp(argv[1], "-vv") == 0) {
407 cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
408 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
409 run_test(cmd, &tests[i]);
414 cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
415 printf("/* Generated by CCAN configurator */\n"
416 "#ifndef CCAN_CONFIG_H\n"
417 "#define CCAN_CONFIG_H\n");
418 printf("#ifndef _GNU_SOURCE\n");
419 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
421 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
422 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
423 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
424 printf("#define %s %u\n", tests[i].name, tests[i].answer);
425 printf("#endif /* CCAN_CONFIG_H */\n");