1 /* Simple tool to create config.h.
2 * Would be much easier with ccan modules, but deliberately standalone. */
14 #define DEFAULT_COMPILER "cc"
15 #define DEFAULT_FLAGS "-g -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
17 #define OUTPUT_FILE "configurator.out"
18 #define INPUT_FILE "configuratortest.c"
26 DEFINES_EVERYTHING = 0x8,
27 MAY_NOT_COMPILE = 0x10,
33 enum test_style style;
40 static struct test tests[] = {
41 { "HAVE_ALIGNOF", INSIDE_MAIN, NULL,
42 "return __alignof__(double) > 0 ? 0 : 1;" },
43 { "HAVE_ASPRINTF", DEFINES_FUNC, NULL,
44 "#define _GNU_SOURCE\n"
45 "#include <stdio.h>\n"
46 "static char *func(int x) {"
48 " if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
51 { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL,
52 "static int __attribute__((cold)) func(int x) { return x; }" },
53 { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
54 "static int __attribute__((const)) func(int x) { return x; }" },
55 { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
56 "typedef short __attribute__((__may_alias__)) short_a;" },
57 { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL,
58 "#include <stdlib.h>\n"
59 "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
60 { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
61 "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
62 { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
63 "static int __attribute__((unused)) func(int x) { return x; }" },
64 { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
65 "static int __attribute__((used)) func(int x) { return x; }" },
66 { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
67 "union { int i; char c[sizeof(int)]; } u;\n"
69 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
70 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
71 "#include <byteswap.h>\n"
72 "static int func(int x) { return bswap_64(x); }" },
73 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
74 "return __builtin_choose_expr(1, 0, \"garbage\");" },
75 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
76 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
77 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
78 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
79 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
80 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
81 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
82 "return __builtin_constant_p(1) ? 0 : 1;" },
83 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
84 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
85 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
86 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
87 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
88 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
89 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
90 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
91 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
92 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
93 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
94 "#include <byteswap.h>\n" },
95 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
96 "int *foo = (int[]) { 1, 2, 3, 4 };\n"
97 "return foo[0] ? 0 : 1;" },
98 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
99 "for (int i = 0; i < argc; i++) { return 0; };\n"
101 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
102 "struct foo { unsigned int x; int arr[]; };" },
103 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
104 "#include <unistd.h>\n"
105 "static int func(void) { return getpagesize(); }" },
106 { "HAVE_ISBLANK", DEFINES_FUNC, NULL,
107 "#include <ctype.h>\n"
108 "static int func(void) { return isblank(' '); }" },
109 { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
110 "union { int i; char c[sizeof(int)]; } u;\n"
111 "u.i = 0x01020304;\n"
112 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
113 { "HAVE_MEMMEM", DEFINES_FUNC, NULL,
114 "#define _GNU_SOURCE\n"
115 "#include <string.h>\n"
116 "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
117 "return memmem(h, hl, n, nl);"
119 { "HAVE_MMAP", DEFINES_FUNC, NULL,
120 "#include <sys/mman.h>\n"
121 "static void *func(int fd) {\n"
122 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
124 { "HAVE_QSORT_R_PRIVATE_LAST",
125 DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL,
126 "#define _GNU_SOURCE 1\n"
127 "#include <stdlib.h>\n"
128 "static int cmp(const void *lp, const void *rp, void *priv) {\n"
129 " *(unsigned int *)priv = 1;\n"
130 " return *(const int *)lp - *(const int *)rp; }\n"
132 " int array[] = { 9, 2, 5 };\n"
133 " unsigned int called = 0;\n"
134 " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
135 " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
137 { "HAVE_NESTED_FUNCTIONS", DEFINES_FUNC, NULL,
138 "void (*func(int val))(int);\n"
139 "void (*func(int val))(int) {\n"
140 " auto void add(int val2);\n"
141 " void add(int val2) { val += val2; }\n"
144 { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL,
145 "static long nest(const void *base, unsigned int i)\n"
148 " return (const char *)&i - (const char *)base;\n"
149 " return nest(base, i-1);\n"
151 "int main(int argc, char *argv[]) {\n"
152 " return (nest(&argc, argc) > 0) ? 0 : 1\n;"
154 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
155 "return ({ int x = argc; x == argc ? 0 : 1; });" },
156 { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
157 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
158 { "HAVE_UTIME", DEFINES_FUNC, NULL,
159 "#include <sys/types.h>\n"
160 "#include <utime.h>\n"
161 "static int func(const char *filename) {\n"
162 " struct utimbuf times = { 0 };\n"
163 " return utime(filename, ×);\n"
165 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
166 "#include <sys/types.h>\n"
167 "#include <utime.h>\n"
168 "static __attribute__((warn_unused_result)) int func(int i) {\n"
173 static char *grab_fd(int fd)
176 size_t max, size = 0;
180 buffer = malloc(max+1);
181 while ((ret = read(fd, buffer + size, max - size)) > 0) {
184 buffer = realloc(buffer, max *= 2);
187 err(1, "reading from command");
192 static char *run(const char *cmd, int *exitstatus)
200 err(1, "creating pipe");
207 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
208 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
210 || close(STDIN_FILENO) != 0
211 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
214 status = system(cmd);
215 if (WIFEXITED(status))
216 exit(WEXITSTATUS(status));
217 /* Here's a hint... */
218 exit(128 + WTERMSIG(status));
223 /* This shouldn't fail... */
224 if (waitpid(pid, &status, 0) != pid)
225 err(1, "Failed to wait for child");
227 if (WIFEXITED(status))
228 *exitstatus = WEXITSTATUS(status);
230 *exitstatus = -WTERMSIG(status);
234 static char *connect_args(const char *argv[], const char *extra)
236 unsigned int i, len = strlen(extra) + 1;
239 for (i = 1; argv[i]; i++)
240 len += 1 + strlen(argv[i]);
244 for (i = 1; argv[i]; i++) {
245 strcpy(ret + len, argv[i]);
246 len += strlen(argv[i]);
249 strcpy(ret + len, extra);
253 static struct test *find_test(const char *name)
257 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
258 if (strcmp(tests[i].name, name) == 0)
264 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
265 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
266 #define USE_FUNC_BOILERPLATE "(void)func;\n"
267 #define MAIN_BODY_BOILERPLATE "return 0;\n"
268 #define MAIN_END_BOILERPLATE "}\n"
270 static bool run_test(const char *cmd, struct test *test)
279 if (test->depends && !run_test(cmd, find_test(test->depends))) {
280 test->answer = false;
285 outf = fopen(INPUT_FILE, "w");
287 err(1, "creating %s", INPUT_FILE);
289 fprintf(outf, "%s", PRE_BOILERPLATE);
290 switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
292 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
293 fprintf(outf, "%s", test->fragment);
294 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
297 fprintf(outf, "%s", test->fragment);
298 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
299 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
300 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
303 fprintf(outf, "%s", test->fragment);
304 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
305 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
306 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
307 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
309 case DEFINES_EVERYTHING:
310 fprintf(outf, "%s", test->fragment);
319 if (system("cat " INPUT_FILE) == -1);
321 output = run(cmd, &status);
322 if (status != 0 || strstr(output, "warning")) {
324 printf("Compile %s for %s, status %i: %s\n",
325 status ? "fail" : "warning",
326 test->name, status, output);
327 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
328 errx(1, "Test for %s did not compile:\n%s",
330 test->answer = false;
333 /* Compile succeeded. */
335 /* We run INSIDE_MAIN tests for sanity checking. */
336 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
337 output = run("./" OUTPUT_FILE, &status);
338 if (!(test->style & EXECUTE) && status != 0)
339 errx(1, "Test for %s failed with %i:\n%s",
340 test->name, status, output);
341 if (verbose && status)
342 printf("%s exited %i\n", test->name, status);
345 test->answer = (status == 0);
351 int main(int argc, const char *argv[])
355 const char *default_args[]
356 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
359 if (strcmp(argv[1], "--help") == 0) {
360 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
361 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
363 DEFAULT_COMPILER, DEFAULT_FLAGS);
366 if (strcmp(argv[1], "-v") == 0) {
370 } else if (strcmp(argv[1], "-vv") == 0) {
380 cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
381 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
382 run_test(cmd, &tests[i]);
387 cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
388 printf("/* Generated by CCAN configurator */\n"
389 "#ifndef CCAN_CONFIG_H\n"
390 "#define CCAN_CONFIG_H\n");
391 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
392 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
393 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
394 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
395 printf("#define %s %u\n", tests[i].name, tests[i].answer);
396 printf("#endif /* CCAN_CONFIG_H */\n");