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_PRINTF", DEFINES_FUNC, NULL,
48 "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
49 { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
50 "static int __attribute__((unused)) func(int x) { return x; }" },
51 { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
52 "static int __attribute__((used)) func(int x) { return x; }" },
53 { "HAVE_BIG_ENDIAN", EXECUTE, NULL,
54 "union { int i; char c[sizeof(int)]; } u;\n"
56 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
57 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
58 "#include <byteswap.h>\n"
59 "static int func(int x) { return bswap_64(x); }" },
60 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
61 "return __builtin_choose_expr(1, 0, \"garbage\");" },
62 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
63 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
64 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
65 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
66 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
67 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
68 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
69 "return __builtin_constant_p(1) ? 0 : 1;" },
70 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
71 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
72 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
73 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
74 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
75 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
76 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
77 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
78 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
79 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
80 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
81 "#include <byteswap.h>\n" },
82 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
83 "char **foo = (char *[]) { \"x\", \"y\", \"z\" };\n"
84 "return foo[0] ? 0 : 1;" },
85 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
86 "for (int i = 0; i < argc; i++) { return 0; };\n"
88 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
89 "#include <unistd.h>\n"
90 "static int func(void) { return getpagesize(); }" },
91 { "HAVE_LITTLE_ENDIAN", EXECUTE, NULL,
92 "union { int i; char c[sizeof(int)]; } u;\n"
94 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
95 { "HAVE_MMAP", DEFINES_FUNC, NULL,
96 "#include <sys/mman.h>\n"
97 "static void *func(int fd) {\n"
98 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
100 { "HAVE_NESTED_FUNCTIONS", DEFINES_FUNC, NULL,
101 "static int func(int val) {\n"
102 " auto void add(int val2);\n"
103 " void add(int val2) { val += val2; }\n"
107 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
108 "return ({ int x = argc; x == argc ? 0 : 1; });" },
109 { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
110 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
111 { "HAVE_UTIME", DEFINES_FUNC, NULL,
112 "#include <sys/types.h>\n"
113 "#include <utime.h>\n"
114 "static int func(const char *filename) {\n"
115 " struct utimbuf times = { 0 };\n"
116 " return utime(filename, ×);\n"
118 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
119 "#include <sys/types.h>\n"
120 "#include <utime.h>\n"
121 "static __attribute__((warn_unused_result)) int func(int i) {\n"
126 static char *grab_fd(int fd)
129 size_t max, size = 0;
133 buffer = malloc(max+1);
134 while ((ret = read(fd, buffer + size, max - size)) > 0) {
137 buffer = realloc(buffer, max *= 2);
140 err(1, "reading from command");
145 static char *run(const char *cmd, int *exitstatus)
153 err(1, "creating pipe");
160 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
161 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
163 || close(STDIN_FILENO) != 0
164 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
167 status = system(cmd);
168 if (WIFEXITED(status))
169 exit(WEXITSTATUS(status));
170 /* Here's a hint... */
171 exit(128 + WTERMSIG(status));
176 /* This shouldn't fail... */
177 if (waitpid(pid, &status, 0) != pid)
178 err(1, "Failed to wait for child");
180 if (WIFEXITED(status))
181 *exitstatus = WEXITSTATUS(status);
183 *exitstatus = -WTERMSIG(status);
187 static char *connect_args(char *argv[], const char *extra)
189 unsigned int i, len = strlen(extra) + 1;
192 for (i = 1; argv[i]; i++)
193 len += 1 + strlen(argv[i]);
197 for (i = 1; argv[i]; i++) {
198 strcpy(ret + len, argv[i]);
199 len += strlen(argv[i]);
202 strcpy(ret + len, extra);
206 static struct test *find_test(const char *name)
210 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
211 if (strcmp(tests[i].name, name) == 0)
217 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
218 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
219 #define USE_FUNC_BOILERPLATE "(void)func;\n"
220 #define MAIN_BODY_BOILERPLATE "return 0;\n"
221 #define MAIN_END_BOILERPLATE "}\n"
223 static bool run_test(const char *cmd, struct test *test)
232 if (test->depends && !run_test(cmd, find_test(test->depends))) {
233 test->answer = false;
238 outf = fopen(INPUT_FILE, "w");
240 err(1, "creating %s", INPUT_FILE);
242 fprintf(outf, "%s", PRE_BOILERPLATE);
243 switch (test->style) {
246 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
247 fprintf(outf, "%s", test->fragment);
248 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
251 fprintf(outf, "%s", test->fragment);
252 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
253 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
254 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
257 fprintf(outf, "%s", test->fragment);
258 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
259 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
260 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
261 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
267 if (system("cat " INPUT_FILE) == -1);
269 output = run(cmd, &status);
272 printf("Compile fail for %s, status %i: %s\n",
273 test->name, status, output);
274 if (test->style == EXECUTE)
275 errx(1, "Test for %s did not compile:\n%s",
277 test->answer = false;
280 /* Compile succeeded. */
282 /* We run INSIDE_MAIN tests for sanity checking. */
283 if (test->style == EXECUTE || test->style == INSIDE_MAIN) {
284 output = run("./" OUTPUT_FILE, &status);
285 if (test->style == INSIDE_MAIN && status != 0)
286 errx(1, "Test for %s failed with %i:\n%s",
287 test->name, status, output);
288 if (verbose && status)
289 printf("%s exited %i\n", test->name, status);
292 test->answer = (status == 0);
298 int main(int argc, char *argv[])
301 char *default_args[] = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
305 if (strcmp(argv[1], "--help") == 0) {
306 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
307 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
309 DEFAULT_COMPILER, DEFAULT_FLAGS);
312 if (strcmp(argv[1], "-v") == 0) {
316 } else if (strcmp(argv[1], "-vv") == 0) {
326 cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
327 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
328 run_test(cmd, &tests[i]);
333 cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
334 printf("/* Generated by CCAN configurator */\n");
335 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
336 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
337 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
338 printf("#define %s %u\n", tests[i].name, tests[i].answer);