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_ASPRINTF", DEFINES_FUNC, NULL,
42 "#define _GNU_SOURCE\n"
43 "#include <stdio.h>\n"
44 "static char *func(int x) {"
46 " if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
49 { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL,
50 "static int __attribute__((cold)) func(int x) { return x; }" },
51 { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
52 "static int __attribute__((const)) func(int x) { return x; }" },
53 { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
54 "typedef short __attribute__((__may_alias__)) short_a;" },
55 { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL,
56 "#include <stdlib.h>\n"
57 "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
58 { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
59 "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
60 { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
61 "static int __attribute__((unused)) func(int x) { return x; }" },
62 { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
63 "static int __attribute__((used)) func(int x) { return x; }" },
64 { "HAVE_BIG_ENDIAN", EXECUTE, NULL,
65 "union { int i; char c[sizeof(int)]; } u;\n"
67 "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
68 { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
69 "#include <byteswap.h>\n"
70 "static int func(int x) { return bswap_64(x); }" },
71 { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
72 "return __builtin_choose_expr(1, 0, \"garbage\");" },
73 { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
74 "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
75 { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
76 "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
77 { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
78 "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
79 { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
80 "return __builtin_constant_p(1) ? 0 : 1;" },
81 { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
82 "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
83 { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
84 "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
85 { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
86 "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
87 { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
88 "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
89 { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
90 "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
91 { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
92 "#include <byteswap.h>\n" },
93 { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
94 "char **foo = (char *[]) { \"x\", \"y\", \"z\" };\n"
95 "return foo[0] ? 0 : 1;" },
96 { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
97 "for (int i = 0; i < argc; i++) { return 0; };\n"
99 { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
100 "struct foo { unsigned int x; int arr[]; };" },
101 { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
102 "#include <unistd.h>\n"
103 "static int func(void) { return getpagesize(); }" },
104 { "HAVE_LITTLE_ENDIAN", EXECUTE, NULL,
105 "union { int i; char c[sizeof(int)]; } u;\n"
106 "u.i = 0x01020304;\n"
107 "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
108 { "HAVE_MMAP", DEFINES_FUNC, NULL,
109 "#include <sys/mman.h>\n"
110 "static void *func(int fd) {\n"
111 " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
113 { "HAVE_NESTED_FUNCTIONS", DEFINES_FUNC, NULL,
114 "static int func(int val) {\n"
115 " auto void add(int val2);\n"
116 " void add(int val2) { val += val2; }\n"
120 { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
121 "return ({ int x = argc; x == argc ? 0 : 1; });" },
122 { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
123 "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
124 { "HAVE_UTIME", DEFINES_FUNC, NULL,
125 "#include <sys/types.h>\n"
126 "#include <utime.h>\n"
127 "static int func(const char *filename) {\n"
128 " struct utimbuf times = { 0 };\n"
129 " return utime(filename, ×);\n"
131 { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
132 "#include <sys/types.h>\n"
133 "#include <utime.h>\n"
134 "static __attribute__((warn_unused_result)) int func(int i) {\n"
139 static char *grab_fd(int fd)
142 size_t max, size = 0;
146 buffer = malloc(max+1);
147 while ((ret = read(fd, buffer + size, max - size)) > 0) {
150 buffer = realloc(buffer, max *= 2);
153 err(1, "reading from command");
158 static char *run(const char *cmd, int *exitstatus)
166 err(1, "creating pipe");
173 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
174 || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
176 || close(STDIN_FILENO) != 0
177 || open("/dev/null", O_RDONLY) != STDIN_FILENO)
180 status = system(cmd);
181 if (WIFEXITED(status))
182 exit(WEXITSTATUS(status));
183 /* Here's a hint... */
184 exit(128 + WTERMSIG(status));
189 /* This shouldn't fail... */
190 if (waitpid(pid, &status, 0) != pid)
191 err(1, "Failed to wait for child");
193 if (WIFEXITED(status))
194 *exitstatus = WEXITSTATUS(status);
196 *exitstatus = -WTERMSIG(status);
200 static char *connect_args(char *argv[], const char *extra)
202 unsigned int i, len = strlen(extra) + 1;
205 for (i = 1; argv[i]; i++)
206 len += 1 + strlen(argv[i]);
210 for (i = 1; argv[i]; i++) {
211 strcpy(ret + len, argv[i]);
212 len += strlen(argv[i]);
215 strcpy(ret + len, extra);
219 static struct test *find_test(const char *name)
223 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
224 if (strcmp(tests[i].name, name) == 0)
230 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
231 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
232 #define USE_FUNC_BOILERPLATE "(void)func;\n"
233 #define MAIN_BODY_BOILERPLATE "return 0;\n"
234 #define MAIN_END_BOILERPLATE "}\n"
236 static bool run_test(const char *cmd, struct test *test)
245 if (test->depends && !run_test(cmd, find_test(test->depends))) {
246 test->answer = false;
251 outf = fopen(INPUT_FILE, "w");
253 err(1, "creating %s", INPUT_FILE);
255 fprintf(outf, "%s", PRE_BOILERPLATE);
256 switch (test->style) {
259 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
260 fprintf(outf, "%s", test->fragment);
261 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
264 fprintf(outf, "%s", test->fragment);
265 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
266 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
267 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
270 fprintf(outf, "%s", test->fragment);
271 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
272 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
273 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
274 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
280 if (system("cat " INPUT_FILE) == -1);
282 output = run(cmd, &status);
283 if (status != 0 || strstr(output, "warning")) {
285 printf("Compile %s for %s, status %i: %s\n",
286 status ? "fail" : "warning",
287 test->name, status, output);
288 if (test->style == EXECUTE)
289 errx(1, "Test for %s did not compile:\n%s",
291 test->answer = false;
294 /* Compile succeeded. */
296 /* We run INSIDE_MAIN tests for sanity checking. */
297 if (test->style == EXECUTE || test->style == INSIDE_MAIN) {
298 output = run("./" OUTPUT_FILE, &status);
299 if (test->style == INSIDE_MAIN && status != 0)
300 errx(1, "Test for %s failed with %i:\n%s",
301 test->name, status, output);
302 if (verbose && status)
303 printf("%s exited %i\n", test->name, status);
306 test->answer = (status == 0);
312 int main(int argc, char *argv[])
315 char *default_args[] = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
319 if (strcmp(argv[1], "--help") == 0) {
320 printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
321 " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
323 DEFAULT_COMPILER, DEFAULT_FLAGS);
326 if (strcmp(argv[1], "-v") == 0) {
330 } else if (strcmp(argv[1], "-vv") == 0) {
340 cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
341 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
342 run_test(cmd, &tests[i]);
347 cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
348 printf("/* Generated by CCAN configurator */\n"
349 "#ifndef CCAN_CONFIG_H\n"
350 "#define CCAN_CONFIG_H\n");
351 printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
352 printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
353 printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
354 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
355 printf("#define %s %u\n", tests[i].name, tests[i].answer);
356 printf("#endif /* CCAN_CONFIG_H */\n");