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"
31 enum test_style style;
38 static struct test tests[] = {
39 { "HAVE_ALIGNOF", INSIDE_MAIN, NULL,
40 "return __alignof__(double) > 0 ? 0 : 1;" },
41 { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL,
42 "static int __attribute__((cold)) func(int x) { return x; }" },
43 { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
44 "static int __attribute__((const)) func(int x) { return x; }" },
45 { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
46 "typedef short __attribute__((__may_alias__)) short_a;" },
47 { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL,
48 "#include <stdlib.h>\n"
49 "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
50 { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
51 "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
52 { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
53 "static int __attribute__((unused)) func(int x) { return x; }" },
54 { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
55 "static int __attribute__((used)) func(int x) { return x; }" },
56 { "HAVE_BIG_ENDIAN", EXECUTE, NULL,
57 "union { int i; char c[sizeof(int)]; } u;\n"
59 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
60 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
61 "#include <byteswap.h>\n"
62 "static int func(int x) { return bswap_64(x); }" },
63 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
64 "return __builtin_choose_expr(1, 0, \"garbage\");" },
65 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
66 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
67 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
68 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
69 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
70 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
71 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
72 "return __builtin_constant_p(1) ? 0 : 1;" },
73 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
74 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
75 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
76 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
77 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
78 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
79 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
80 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
81 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
82 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
83 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
84 "#include <byteswap.h>\n" },
85 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
86 "char **foo = (char *[]) { \"x\", \"y\", \"z\" };\n"
87 "return foo[0] ? 0 : 1;" },
88 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
89 "for (int i = 0; i < argc; i++) { return 0; };\n"
91 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
92 "struct foo { unsigned int x; int arr[]; };" },
93 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
94 "#include <unistd.h>\n"
95 "static int func(void) { return getpagesize(); }" },
96 { "HAVE_LITTLE_ENDIAN", EXECUTE, NULL,
97 "union { int i; char c[sizeof(int)]; } u;\n"
99 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
100 { "HAVE_MMAP", DEFINES_FUNC, NULL,
101 "#include <sys/mman.h>\n"
102 "static void *func(int fd) {\n"
103 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
105 { "HAVE_NESTED_FUNCTIONS", DEFINES_FUNC, NULL,
106 "static int func(int val) {\n"
107 " auto void add(int val2);\n"
108 " void add(int val2) { val += val2; }\n"
112 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
113 "return ({ int x = argc; x == argc ? 0 : 1; });" },
114 { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
115 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
116 { "HAVE_UTIME", DEFINES_FUNC, NULL,
117 "#include <sys/types.h>\n"
118 "#include <utime.h>\n"
119 "static int func(const char *filename) {\n"
120 " struct utimbuf times = { 0 };\n"
121 " return utime(filename, ×);\n"
123 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
124 "#include <sys/types.h>\n"
125 "#include <utime.h>\n"
126 "static __attribute__((warn_unused_result)) int func(int i) {\n"
131 static char *grab_fd(int fd)
134 size_t max, size = 0;
138 buffer = malloc(max+1);
139 while ((ret = read(fd, buffer + size, max - size)) > 0) {
142 buffer = realloc(buffer, max *= 2);
145 err(1, "reading from command");
150 static char *run(const char *cmd, int *exitstatus)
158 err(1, "creating pipe");
165 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
166 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
168 || close(STDIN_FILENO) != 0
169 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
172 status = system(cmd);
173 if (WIFEXITED(status))
174 exit(WEXITSTATUS(status));
175 /* Here's a hint... */
176 exit(128 + WTERMSIG(status));
181 /* This shouldn't fail... */
182 if (waitpid(pid, &status, 0) != pid)
183 err(1, "Failed to wait for child");
185 if (WIFEXITED(status))
186 *exitstatus = WEXITSTATUS(status);
188 *exitstatus = -WTERMSIG(status);
192 static char *connect_args(char *argv[], const char *extra)
194 unsigned int i, len = strlen(extra) + 1;
197 for (i = 1; argv[i]; i++)
198 len += 1 + strlen(argv[i]);
202 for (i = 1; argv[i]; i++) {
203 strcpy(ret + len, argv[i]);
204 len += strlen(argv[i]);
207 strcpy(ret + len, extra);
211 static struct test *find_test(const char *name)
215 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
216 if (strcmp(tests[i].name, name) == 0)
222 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
223 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
224 #define USE_FUNC_BOILERPLATE "(void)func;\n"
225 #define MAIN_BODY_BOILERPLATE "return 0;\n"
226 #define MAIN_END_BOILERPLATE "}\n"
228 static bool run_test(const char *cmd, struct test *test)
237 if (test->depends && !run_test(cmd, find_test(test->depends))) {
238 test->answer = false;
243 outf = fopen(INPUT_FILE, "w");
245 err(1, "creating %s", INPUT_FILE);
247 fprintf(outf, "%s", PRE_BOILERPLATE);
248 switch (test->style) {
251 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
252 fprintf(outf, "%s", test->fragment);
253 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
256 fprintf(outf, "%s", test->fragment);
257 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
258 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
259 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
262 fprintf(outf, "%s", test->fragment);
263 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
264 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
265 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
266 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
272 if (system("cat " INPUT_FILE) == -1);
274 output = run(cmd, &status);
275 if (status != 0 || strstr(output, "warning")) {
277 printf("Compile %s for %s, status %i: %s\n",
278 status ? "fail" : "warning",
279 test->name, status, output);
280 if (test->style == EXECUTE)
281 errx(1, "Test for %s did not compile:\n%s",
283 test->answer = false;
286 /* Compile succeeded. */
288 /* We run INSIDE_MAIN tests for sanity checking. */
289 if (test->style == EXECUTE || test->style == INSIDE_MAIN) {
290 output = run("./" OUTPUT_FILE, &status);
291 if (test->style == INSIDE_MAIN && status != 0)
292 errx(1, "Test for %s failed with %i:\n%s",
293 test->name, status, output);
294 if (verbose && status)
295 printf("%s exited %i\n", test->name, status);
298 test->answer = (status == 0);
304 int main(int argc, char *argv[])
307 char *default_args[] = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
311 if (strcmp(argv[1], "--help") == 0) {
312 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
313 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
315 DEFAULT_COMPILER, DEFAULT_FLAGS);
318 if (strcmp(argv[1], "-v") == 0) {
322 } else if (strcmp(argv[1], "-vv") == 0) {
332 cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
333 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
334 run_test(cmd, &tests[i]);
339 cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
340 printf("/* Generated by CCAN configurator */\n");
341 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
342 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
343 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
344 printf("#define %s %u\n", tests[i].name, tests[i].answer);