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_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
89 "struct foo { unsigned int x; int arr[]; };" },
90 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
91 "#include <unistd.h>\n"
92 "static int func(void) { return getpagesize(); }" },
93 { "HAVE_LITTLE_ENDIAN", EXECUTE, NULL,
94 "union { int i; char c[sizeof(int)]; } u;\n"
96 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
97 { "HAVE_MMAP", DEFINES_FUNC, NULL,
98 "#include <sys/mman.h>\n"
99 "static void *func(int fd) {\n"
100 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
102 { "HAVE_NESTED_FUNCTIONS", DEFINES_FUNC, NULL,
103 "static int func(int val) {\n"
104 " auto void add(int val2);\n"
105 " void add(int val2) { val += val2; }\n"
109 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
110 "return ({ int x = argc; x == argc ? 0 : 1; });" },
111 { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
112 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
113 { "HAVE_UTIME", DEFINES_FUNC, NULL,
114 "#include <sys/types.h>\n"
115 "#include <utime.h>\n"
116 "static int func(const char *filename) {\n"
117 " struct utimbuf times = { 0 };\n"
118 " return utime(filename, ×);\n"
120 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
121 "#include <sys/types.h>\n"
122 "#include <utime.h>\n"
123 "static __attribute__((warn_unused_result)) int func(int i) {\n"
128 static char *grab_fd(int fd)
131 size_t max, size = 0;
135 buffer = malloc(max+1);
136 while ((ret = read(fd, buffer + size, max - size)) > 0) {
139 buffer = realloc(buffer, max *= 2);
142 err(1, "reading from command");
147 static char *run(const char *cmd, int *exitstatus)
155 err(1, "creating pipe");
162 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
163 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
165 || close(STDIN_FILENO) != 0
166 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
169 status = system(cmd);
170 if (WIFEXITED(status))
171 exit(WEXITSTATUS(status));
172 /* Here's a hint... */
173 exit(128 + WTERMSIG(status));
178 /* This shouldn't fail... */
179 if (waitpid(pid, &status, 0) != pid)
180 err(1, "Failed to wait for child");
182 if (WIFEXITED(status))
183 *exitstatus = WEXITSTATUS(status);
185 *exitstatus = -WTERMSIG(status);
189 static char *connect_args(char *argv[], const char *extra)
191 unsigned int i, len = strlen(extra) + 1;
194 for (i = 1; argv[i]; i++)
195 len += 1 + strlen(argv[i]);
199 for (i = 1; argv[i]; i++) {
200 strcpy(ret + len, argv[i]);
201 len += strlen(argv[i]);
204 strcpy(ret + len, extra);
208 static struct test *find_test(const char *name)
212 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
213 if (strcmp(tests[i].name, name) == 0)
219 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
220 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
221 #define USE_FUNC_BOILERPLATE "(void)func;\n"
222 #define MAIN_BODY_BOILERPLATE "return 0;\n"
223 #define MAIN_END_BOILERPLATE "}\n"
225 static bool run_test(const char *cmd, struct test *test)
234 if (test->depends && !run_test(cmd, find_test(test->depends))) {
235 test->answer = false;
240 outf = fopen(INPUT_FILE, "w");
242 err(1, "creating %s", INPUT_FILE);
244 fprintf(outf, "%s", PRE_BOILERPLATE);
245 switch (test->style) {
248 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
249 fprintf(outf, "%s", test->fragment);
250 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
253 fprintf(outf, "%s", test->fragment);
254 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
255 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
256 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
259 fprintf(outf, "%s", test->fragment);
260 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
261 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
262 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
263 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
269 if (system("cat " INPUT_FILE) == -1);
271 output = run(cmd, &status);
272 if (status != 0 || strstr(output, "warning")) {
274 printf("Compile %s for %s, status %i: %s\n",
275 status ? "fail" : "warning",
276 test->name, status, output);
277 if (test->style == EXECUTE)
278 errx(1, "Test for %s did not compile:\n%s",
280 test->answer = false;
283 /* Compile succeeded. */
285 /* We run INSIDE_MAIN tests for sanity checking. */
286 if (test->style == EXECUTE || test->style == INSIDE_MAIN) {
287 output = run("./" OUTPUT_FILE, &status);
288 if (test->style == INSIDE_MAIN && status != 0)
289 errx(1, "Test for %s failed with %i:\n%s",
290 test->name, status, output);
291 if (verbose && status)
292 printf("%s exited %i\n", test->name, status);
295 test->answer = (status == 0);
301 int main(int argc, char *argv[])
304 char *default_args[] = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
308 if (strcmp(argv[1], "--help") == 0) {
309 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
310 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
312 DEFAULT_COMPILER, DEFAULT_FLAGS);
315 if (strcmp(argv[1], "-v") == 0) {
319 } else if (strcmp(argv[1], "-vv") == 0) {
329 cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
330 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
331 run_test(cmd, &tests[i]);
336 cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
337 printf("/* Generated by CCAN configurator */\n");
338 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
339 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
340 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
341 printf("#define %s %u\n", tests[i].name, tests[i].answer);