str: fix tests on unsigned chars, and !HAVE_ISBLANK.
[ccan] / tools / configurator / configurator.c
1 /* Simple tool to create config.h.
2  * Would be much easier with ccan modules, but deliberately standalone. */
3 #include <stdio.h>
4 #include <stdbool.h>
5 #include <stdlib.h>
6 #include <unistd.h>
7 #include <err.h>
8 #include <sys/types.h>
9 #include <sys/wait.h>
10 #include <sys/stat.h>
11 #include <fcntl.h>
12 #include <string.h>
13
14 #define DEFAULT_COMPILER "cc"
15 #define DEFAULT_FLAGS "-g -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
16
17 #define OUTPUT_FILE "configurator.out"
18 #define INPUT_FILE "configuratortest.c"
19
20 static int verbose;
21
22 enum test_style {
23         OUTSIDE_MAIN            = 0x1,
24         DEFINES_FUNC            = 0x2,
25         INSIDE_MAIN             = 0x4,
26         DEFINES_EVERYTHING      = 0x8,
27         MAY_NOT_COMPILE         = 0x10,
28         EXECUTE                 = 0x8000
29 };
30
31 struct test {
32         const char *name;
33         enum test_style style;
34         const char *depends;
35         const char *fragment;
36         bool done;
37         bool answer;
38 };
39
40 static struct test tests[] = {
41         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL,
42           "#include <sys/types.h>\n"
43           "int main(int argc, char *argv[]) {\n"
44           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
45           "}\n" },
46         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL,
47           "return __alignof__(double) > 0 ? 0 : 1;" },
48         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL,
49           "#define _GNU_SOURCE\n"
50           "#include <stdio.h>\n"
51           "static char *func(int x) {"
52           "     char *p;\n"
53           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
54           "     return p;\n"
55           "}" },
56         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL,
57           "static int __attribute__((cold)) func(int x) { return x; }" },
58         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
59           "static int __attribute__((const)) func(int x) { return x; }" },
60         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
61           "typedef short __attribute__((__may_alias__)) short_a;" },
62         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL,
63           "#include <stdlib.h>\n"
64           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
65         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
66           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
67         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
68           "static int __attribute__((unused)) func(int x) { return x; }" },
69         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
70           "static int __attribute__((used)) func(int x) { return x; }" },
71         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
72           "union { int i; char c[sizeof(int)]; } u;\n"
73           "u.i = 0x01020304;\n"
74           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
75         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
76           "#include <byteswap.h>\n"
77           "static int func(int x) { return bswap_64(x); }" },
78         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
79           "return __builtin_choose_expr(1, 0, \"garbage\");" },
80         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
81           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
82         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
83           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
84         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
85           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
86         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
87           "return __builtin_constant_p(1) ? 0 : 1;" },
88         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
89           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
90         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
91           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
92         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL,
93           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
94         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
95           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
96         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
97           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
98         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
99           "#include <byteswap.h>\n" },
100         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
101           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
102           "return foo[0] ? 0 : 1;" },
103         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
104           "HAVE_32BIT_OFF_T",
105           "#define _FILE_OFFSET_BITS 64\n"
106           "#include <sys/types.h>\n"
107           "int main(int argc, char *argv[]) {\n"
108           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
109           "}\n" },
110         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
111           "for (int i = 0; i < argc; i++) { return 0; };\n"
112           "return 1;" },
113         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL,
114           "struct foo { unsigned int x; int arr[]; };" },
115         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
116           "#include <unistd.h>\n"
117           "static int func(void) { return getpagesize(); }" },
118         { "HAVE_ISBLANK", DEFINES_FUNC, NULL,
119           "#define _GNU_SOURCE\n"
120           "#include <ctype.h>\n"
121           "static int func(void) { return isblank(' '); }" },
122         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL,
123           "union { int i; char c[sizeof(int)]; } u;\n"
124           "u.i = 0x01020304;\n"
125           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
126         { "HAVE_MEMMEM", DEFINES_FUNC, NULL,
127           "#define _GNU_SOURCE\n"
128           "#include <string.h>\n"
129           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
130           "return memmem(h, hl, n, nl);"
131           "}\n", },
132         { "HAVE_MMAP", DEFINES_FUNC, NULL,
133           "#include <sys/mman.h>\n"
134           "static void *func(int fd) {\n"
135           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
136           "}" },
137         { "HAVE_QSORT_R_PRIVATE_LAST",
138           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL,
139           "#define _GNU_SOURCE 1\n"
140           "#include <stdlib.h>\n"
141           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
142           " *(unsigned int *)priv = 1;\n"
143           " return *(const int *)lp - *(const int *)rp; }\n"
144           "int main(void) {\n"
145           " int array[] = { 9, 2, 5 };\n"
146           " unsigned int called = 0;\n"
147           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
148           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
149           "}\n" },
150         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL,
151           "static long nest(const void *base, unsigned int i)\n"
152           "{\n"
153           "     if (i == 0)\n"
154           "             return (const char *)&i - (const char *)base;\n"
155           "     return nest(base, i-1);\n"
156           "}\n"
157           "int main(int argc, char *argv[]) {\n"
158           "     return (nest(&argc, argc) > 0) ? 0 : 1\n;"
159           "}\n" },
160         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
161           "return ({ int x = argc; x == argc ? 0 : 1; });" },
162         { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
163           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
164         { "HAVE_UTIME", DEFINES_FUNC, NULL,
165           "#include <sys/types.h>\n"
166           "#include <utime.h>\n"
167           "static int func(const char *filename) {\n"
168           "     struct utimbuf times = { 0 };\n"
169           "     return utime(filename, &times);\n"
170           "}" },
171         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
172           "#include <sys/types.h>\n"
173           "#include <utime.h>\n"
174           "static __attribute__((warn_unused_result)) int func(int i) {\n"
175           "     return i + 1;\n"
176           "}" },
177 };
178
179 static char *grab_fd(int fd)
180 {
181         int ret;
182         size_t max, size = 0;
183         char *buffer;
184
185         max = 16384;
186         buffer = malloc(max+1);
187         while ((ret = read(fd, buffer + size, max - size)) > 0) {
188                 size += ret;
189                 if (size == max)
190                         buffer = realloc(buffer, max *= 2);
191         }
192         if (ret < 0)
193                 err(1, "reading from command");
194         buffer[size] = '\0';
195         return buffer;
196 }
197
198 static char *run(const char *cmd, int *exitstatus)
199 {
200         pid_t pid;
201         int p[2];
202         char *ret;
203         int status;
204
205         if (pipe(p) != 0)
206                 err(1, "creating pipe");
207
208         pid = fork();
209         if (pid == -1)
210                 err(1, "forking");
211
212         if (pid == 0) {
213                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
214                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
215                     || close(p[0]) != 0
216                     || close(STDIN_FILENO) != 0
217                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
218                         exit(128);
219
220                 status = system(cmd);
221                 if (WIFEXITED(status))
222                         exit(WEXITSTATUS(status));
223                 /* Here's a hint... */
224                 exit(128 + WTERMSIG(status));
225         }
226
227         close(p[1]);
228         ret = grab_fd(p[0]);
229         /* This shouldn't fail... */
230         if (waitpid(pid, &status, 0) != pid)
231                 err(1, "Failed to wait for child");
232         close(p[0]);
233         if (WIFEXITED(status))
234                 *exitstatus = WEXITSTATUS(status);
235         else
236                 *exitstatus = -WTERMSIG(status);
237         return ret;
238 }
239
240 static char *connect_args(const char *argv[], const char *extra)
241 {
242         unsigned int i, len = strlen(extra) + 1;
243         char *ret;
244
245         for (i = 1; argv[i]; i++)
246                 len += 1 + strlen(argv[i]);
247
248         ret = malloc(len);
249         len = 0;
250         for (i = 1; argv[i]; i++) {
251                 strcpy(ret + len, argv[i]);
252                 len += strlen(argv[i]);
253                 ret[len++] = ' ';
254         }
255         strcpy(ret + len, extra);
256         return ret;
257 }
258
259 static struct test *find_test(const char *name)
260 {
261         unsigned int i;
262
263         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
264                 if (strcmp(tests[i].name, name) == 0)
265                         return &tests[i];
266         }
267         abort();
268 }
269
270 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
271 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
272 #define USE_FUNC_BOILERPLATE "(void)func;\n"
273 #define MAIN_BODY_BOILERPLATE "return 0;\n"
274 #define MAIN_END_BOILERPLATE "}\n"
275
276 static bool run_test(const char *cmd, struct test *test)
277 {
278         char *output;
279         FILE *outf;
280         int status;
281
282         if (test->done)
283                 return test->answer;
284
285         if (test->depends && !run_test(cmd, find_test(test->depends))) {
286                 test->answer = false;
287                 test->done = true;
288                 return test->answer;
289         }
290
291         outf = fopen(INPUT_FILE, "w");
292         if (!outf)
293                 err(1, "creating %s", INPUT_FILE);
294
295         fprintf(outf, "%s", PRE_BOILERPLATE);
296         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
297         case INSIDE_MAIN:
298                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
299                 fprintf(outf, "%s", test->fragment);
300                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
301                 break;
302         case OUTSIDE_MAIN:
303                 fprintf(outf, "%s", test->fragment);
304                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
305                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
306                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
307                 break;
308         case DEFINES_FUNC:
309                 fprintf(outf, "%s", test->fragment);
310                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
311                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
312                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
313                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
314                 break;
315         case DEFINES_EVERYTHING:
316                 fprintf(outf, "%s", test->fragment);
317                 break;
318         default:
319                 abort();
320
321         }
322         fclose(outf);
323
324         if (verbose > 1)
325                 if (system("cat " INPUT_FILE) == -1);
326
327         output = run(cmd, &status);
328         if (status != 0 || strstr(output, "warning")) {
329                 if (verbose)
330                         printf("Compile %s for %s, status %i: %s\n",
331                                status ? "fail" : "warning",
332                                test->name, status, output);
333                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
334                         errx(1, "Test for %s did not compile:\n%s",
335                              test->name, output);
336                 test->answer = false;
337                 free(output);
338         } else {
339                 /* Compile succeeded. */
340                 free(output);
341                 /* We run INSIDE_MAIN tests for sanity checking. */
342                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
343                         output = run("./" OUTPUT_FILE, &status);
344                         if (!(test->style & EXECUTE) && status != 0)
345                                 errx(1, "Test for %s failed with %i:\n%s",
346                                      test->name, status, output);
347                         if (verbose && status)
348                                 printf("%s exited %i\n", test->name, status);
349                         free(output);
350                 }
351                 test->answer = (status == 0);
352         }
353         test->done = true;
354         return test->answer;
355 }
356
357 int main(int argc, const char *argv[])
358 {
359         char *cmd;
360         unsigned int i;
361         const char *default_args[]
362                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
363
364         if (argc > 1) {
365                 if (strcmp(argv[1], "--help") == 0) {
366                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
367                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
368                                "Default: %s %s\n",
369                                DEFAULT_COMPILER, DEFAULT_FLAGS);
370                         exit(0);
371                 }
372                 if (strcmp(argv[1], "-v") == 0) {
373                         argc--;
374                         argv++;
375                         verbose = 1;
376                 } else if (strcmp(argv[1], "-vv") == 0) {
377                         argc--;
378                         argv++;
379                         verbose = 2;
380                 }
381         }
382
383         if (argc == 1)
384                 argv = default_args;
385
386         cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
387         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
388                 run_test(cmd, &tests[i]);
389
390         unlink(OUTPUT_FILE);
391         unlink(INPUT_FILE);
392
393         cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
394         printf("/* Generated by CCAN configurator */\n"
395                "#ifndef CCAN_CONFIG_H\n"
396                "#define CCAN_CONFIG_H\n");
397         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
398         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
399         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
400         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
401                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
402         printf("#endif /* CCAN_CONFIG_H */\n");
403         return 0;
404 }