configurator: add HAVE_ERR_H test.
[ccan] / tools / configurator / configurator.c
1 /* Simple tool to create config.h.
2  * Would be much easier with ccan modules, but deliberately standalone.
3  *
4  * Copyright 2011 Rusty Russell <rusty@rustcorp.com.au>.  MIT license.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 #include <stdio.h>
25 #include <stdbool.h>
26 #include <stdlib.h>
27 #include <unistd.h>
28 #include <err.h>
29 #include <sys/types.h>
30 #include <sys/wait.h>
31 #include <sys/stat.h>
32 #include <fcntl.h>
33 #include <string.h>
34
35 #define DEFAULT_COMPILER "cc"
36 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
37
38 #define OUTPUT_FILE "configurator.out"
39 #define INPUT_FILE "configuratortest.c"
40
41 static int verbose;
42
43 enum test_style {
44         OUTSIDE_MAIN            = 0x1,
45         DEFINES_FUNC            = 0x2,
46         INSIDE_MAIN             = 0x4,
47         DEFINES_EVERYTHING      = 0x8,
48         MAY_NOT_COMPILE         = 0x10,
49         EXECUTE                 = 0x8000
50 };
51
52 struct test {
53         const char *name;
54         enum test_style style;
55         const char *depends;
56         const char *fragment;
57         bool done;
58         bool answer;
59 };
60
61 static struct test tests[] = {
62         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL,
63           "#include <sys/types.h>\n"
64           "int main(int argc, char *argv[]) {\n"
65           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
66           "}\n" },
67         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL,
68           "return __alignof__(double) > 0 ? 0 : 1;" },
69         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL,
70           "#define _GNU_SOURCE\n"
71           "#include <stdio.h>\n"
72           "static char *func(int x) {"
73           "     char *p;\n"
74           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
75           "     return p;\n"
76           "}" },
77         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL,
78           "static int __attribute__((cold)) func(int x) { return x; }" },
79         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
80           "static int __attribute__((const)) func(int x) { return x; }" },
81         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
82           "typedef short __attribute__((__may_alias__)) short_a;" },
83         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL,
84           "#include <stdlib.h>\n"
85           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
86         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
87           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
88         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
89           "static int __attribute__((unused)) func(int x) { return x; }" },
90         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
91           "static int __attribute__((used)) func(int x) { return x; }" },
92         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL,
93           "#include <execinfo.h>\n"
94           "static int func(int x) {"
95           "     void *bt[10];\n"
96           "     return backtrace(bt, 10) < x;\n"
97           "}" },
98         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
99           "union { int i; char c[sizeof(int)]; } u;\n"
100           "u.i = 0x01020304;\n"
101           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
102         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
103           "#include <byteswap.h>\n"
104           "static int func(int x) { return bswap_64(x); }" },
105         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
106           "return __builtin_choose_expr(1, 0, \"garbage\");" },
107         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
108           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
109         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
110           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
111         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
112           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
113         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
114           "return __builtin_constant_p(1) ? 0 : 1;" },
115         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
116           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
117         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
118           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
119         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
120           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
121         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
122           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
123         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
124           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
125         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
126           "#include <byteswap.h>\n" },
127         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
128           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
129           "return foo[0] ? 0 : 1;" },
130         { "HAVE_ERR_H", DEFINES_FUNC, NULL,
131           "#include <err.h>\n"
132           "static void func(int arg) {\n"
133           "     if (arg == 0)\n"
134           "             err(1, \"err %u\", arg);\n"
135           "     if (arg == 1)\n"
136           "             errx(1, \"err %u\", arg);\n"
137           "     if (arg == 3)\n"
138           "             warn(\"warn %u\", arg);\n"
139           "     if (arg == 4)\n"
140           "             warnx(\"warn %u\", arg);\n"
141           "}\n" },
142         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
143           "HAVE_32BIT_OFF_T",
144           "#define _FILE_OFFSET_BITS 64\n"
145           "#include <sys/types.h>\n"
146           "int main(int argc, char *argv[]) {\n"
147           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
148           "}\n" },
149         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
150           "for (int i = 0; i < argc; i++) { return 0; };\n"
151           "return 1;" },
152         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
153           "struct foo { unsigned int x; int arr[]; };" },
154         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
155           "#include <unistd.h>\n"
156           "static int func(void) { return getpagesize(); }" },
157         { "HAVE_ISBLANK", DEFINES_FUNC, NULL,
158           "#define _GNU_SOURCE\n"
159           "#include <ctype.h>\n"
160           "static int func(void) { return isblank(' '); }" },
161         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
162           "union { int i; char c[sizeof(int)]; } u;\n"
163           "u.i = 0x01020304;\n"
164           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
165         { "HAVE_MEMMEM", DEFINES_FUNC, NULL,
166           "#define _GNU_SOURCE\n"
167           "#include <string.h>\n"
168           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
169           "return memmem(h, hl, n, nl);"
170           "}\n", },
171         { "HAVE_MMAP", DEFINES_FUNC, NULL,
172           "#include <sys/mman.h>\n"
173           "static void *func(int fd) {\n"
174           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
175           "}" },
176         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL,
177           "#include <sys/types.h>\n"
178           "#include <sys/stat.h>\n"
179           "#include <fcntl.h>\n"
180           "int main(void) {\n"
181           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
182           "}\n" },
183         { "HAVE_QSORT_R_PRIVATE_LAST",
184           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL,
185           "#define _GNU_SOURCE 1\n"
186           "#include <stdlib.h>\n"
187           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
188           " *(unsigned int *)priv = 1;\n"
189           " return *(const int *)lp - *(const int *)rp; }\n"
190           "int main(void) {\n"
191           " int array[] = { 9, 2, 5 };\n"
192           " unsigned int called = 0;\n"
193           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
194           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
195           "}\n" },
196         { "HAVE_SECTION_START_STOP",
197           DEFINES_FUNC, NULL,
198           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
199           "static int func(void) {\n"
200           "     extern void *__start_mysec[], *__stop_mysec[];\n"
201           "     return __stop_mysec - __start_mysec;\n"
202           "}\n" },
203         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL,
204           "static long nest(const void *base, unsigned int i)\n"
205           "{\n"
206           "     if (i == 0)\n"
207           "             return (const char *)&i - (const char *)base;\n"
208           "     return nest(base, i-1);\n"
209           "}\n"
210           "int main(int argc, char *argv[]) {\n"
211           "     return (nest(&argc, argc) > 0) ? 0 : 1\n;"
212           "}\n" },
213         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
214           "return ({ int x = argc; x == argc ? 0 : 1; });" },
215         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, /* Solaris needs this for FIONREAD */
216           "#include <sys/filio.h>\n" },
217         { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
218           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
219         { "HAVE_UTIME", DEFINES_FUNC, NULL,
220           "#include <sys/types.h>\n"
221           "#include <utime.h>\n"
222           "static int func(const char *filename) {\n"
223           "     struct utimbuf times = { 0 };\n"
224           "     return utime(filename, &times);\n"
225           "}" },
226         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
227           "#include <sys/types.h>\n"
228           "#include <utime.h>\n"
229           "static __attribute__((warn_unused_result)) int func(int i) {\n"
230           "     return i + 1;\n"
231           "}" },
232 };
233
234 static char *grab_fd(int fd)
235 {
236         int ret;
237         size_t max, size = 0;
238         char *buffer;
239
240         max = 16384;
241         buffer = malloc(max+1);
242         while ((ret = read(fd, buffer + size, max - size)) > 0) {
243                 size += ret;
244                 if (size == max)
245                         buffer = realloc(buffer, max *= 2);
246         }
247         if (ret < 0)
248                 err(1, "reading from command");
249         buffer[size] = '\0';
250         return buffer;
251 }
252
253 static char *run(const char *cmd, int *exitstatus)
254 {
255         pid_t pid;
256         int p[2];
257         char *ret;
258         int status;
259
260         if (pipe(p) != 0)
261                 err(1, "creating pipe");
262
263         pid = fork();
264         if (pid == -1)
265                 err(1, "forking");
266
267         if (pid == 0) {
268                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
269                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
270                     || close(p[0]) != 0
271                     || close(STDIN_FILENO) != 0
272                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
273                         exit(128);
274
275                 status = system(cmd);
276                 if (WIFEXITED(status))
277                         exit(WEXITSTATUS(status));
278                 /* Here's a hint... */
279                 exit(128 + WTERMSIG(status));
280         }
281
282         close(p[1]);
283         ret = grab_fd(p[0]);
284         /* This shouldn't fail... */
285         if (waitpid(pid, &status, 0) != pid)
286                 err(1, "Failed to wait for child");
287         close(p[0]);
288         if (WIFEXITED(status))
289                 *exitstatus = WEXITSTATUS(status);
290         else
291                 *exitstatus = -WTERMSIG(status);
292         return ret;
293 }
294
295 static char *connect_args(const char *argv[], const char *extra)
296 {
297         unsigned int i, len = strlen(extra) + 1;
298         char *ret;
299
300         for (i = 1; argv[i]; i++)
301                 len += 1 + strlen(argv[i]);
302
303         ret = malloc(len);
304         len = 0;
305         for (i = 1; argv[i]; i++) {
306                 strcpy(ret + len, argv[i]);
307                 len += strlen(argv[i]);
308                 ret[len++] = ' ';
309         }
310         strcpy(ret + len, extra);
311         return ret;
312 }
313
314 static struct test *find_test(const char *name)
315 {
316         unsigned int i;
317
318         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
319                 if (strcmp(tests[i].name, name) == 0)
320                         return &tests[i];
321         }
322         abort();
323 }
324
325 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
326 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
327 #define USE_FUNC_BOILERPLATE "(void)func;\n"
328 #define MAIN_BODY_BOILERPLATE "return 0;\n"
329 #define MAIN_END_BOILERPLATE "}\n"
330
331 static bool run_test(const char *cmd, struct test *test)
332 {
333         char *output;
334         FILE *outf;
335         int status;
336
337         if (test->done)
338                 return test->answer;
339
340         if (test->depends && !run_test(cmd, find_test(test->depends))) {
341                 test->answer = false;
342                 test->done = true;
343                 return test->answer;
344         }
345
346         outf = fopen(INPUT_FILE, "w");
347         if (!outf)
348                 err(1, "creating %s", INPUT_FILE);
349
350         fprintf(outf, "%s", PRE_BOILERPLATE);
351         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
352         case INSIDE_MAIN:
353                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
354                 fprintf(outf, "%s", test->fragment);
355                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
356                 break;
357         case OUTSIDE_MAIN:
358                 fprintf(outf, "%s", test->fragment);
359                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
360                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
361                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
362                 break;
363         case DEFINES_FUNC:
364                 fprintf(outf, "%s", test->fragment);
365                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
366                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
367                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
368                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
369                 break;
370         case DEFINES_EVERYTHING:
371                 fprintf(outf, "%s", test->fragment);
372                 break;
373         default:
374                 abort();
375
376         }
377         fclose(outf);
378
379         if (verbose > 1)
380                 if (system("cat " INPUT_FILE) == -1);
381
382         output = run(cmd, &status);
383         if (status != 0 || strstr(output, "warning")) {
384                 if (verbose)
385                         printf("Compile %s for %s, status %i: %s\n",
386                                status ? "fail" : "warning",
387                                test->name, status, output);
388                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
389                         errx(1, "Test for %s did not compile:\n%s",
390                              test->name, output);
391                 test->answer = false;
392                 free(output);
393         } else {
394                 /* Compile succeeded. */
395                 free(output);
396                 /* We run INSIDE_MAIN tests for sanity checking. */
397                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
398                         output = run("./" OUTPUT_FILE, &status);
399                         if (!(test->style & EXECUTE) && status != 0)
400                                 errx(1, "Test for %s failed with %i:\n%s",
401                                      test->name, status, output);
402                         if (verbose && status)
403                                 printf("%s exited %i\n", test->name, status);
404                         free(output);
405                 }
406                 test->answer = (status == 0);
407         }
408         test->done = true;
409         return test->answer;
410 }
411
412 int main(int argc, const char *argv[])
413 {
414         char *cmd;
415         unsigned int i;
416         const char *default_args[]
417                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
418
419         if (argc > 1) {
420                 if (strcmp(argv[1], "--help") == 0) {
421                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
422                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
423                                "Default: %s %s\n",
424                                DEFAULT_COMPILER, DEFAULT_FLAGS);
425                         exit(0);
426                 }
427                 if (strcmp(argv[1], "-v") == 0) {
428                         argc--;
429                         argv++;
430                         verbose = 1;
431                 } else if (strcmp(argv[1], "-vv") == 0) {
432                         argc--;
433                         argv++;
434                         verbose = 2;
435                 }
436         }
437
438         if (argc == 1)
439                 argv = default_args;
440
441         cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
442         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
443                 run_test(cmd, &tests[i]);
444
445         unlink(OUTPUT_FILE);
446         unlink(INPUT_FILE);
447
448         cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
449         printf("/* Generated by CCAN configurator */\n"
450                "#ifndef CCAN_CONFIG_H\n"
451                "#define CCAN_CONFIG_H\n");
452         printf("#ifndef _GNU_SOURCE\n");
453         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
454         printf("#endif\n");
455         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
456         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
457         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
458         printf("#define HAVE_CCAN 1\n");
459         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
460                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
461         printf("#endif /* CCAN_CONFIG_H */\n");
462         return 0;
463 }