--- /dev/null
+/* Simple tool to create config.h.
+ * Would be much easier with ccan modules, but deliberately standalone. */
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <err.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define DEFAULT_COMPILER "cc"
+#define DEFAULT_FLAGS "-g -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition -Werror"
+
+#define OUTPUT_FILE "configurator.out"
+#define INPUT_FILE "configuratortest.c"
+
+static int verbose;
+
+enum test_style {
+ EXECUTE,
+ OUTSIDE_MAIN,
+ DEFINES_FUNC,
+ INSIDE_MAIN
+};
+
+struct test {
+ const char *name;
+ enum test_style style;
+ const char *depends;
+ const char *fragment;
+ bool done;
+ bool answer;
+};
+
+static struct test tests[] = {
+ { "HAVE_ALIGNOF", INSIDE_MAIN, NULL,
+ "return __alignof__(double) > 0 ? 0 : 1;" },
+ { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL,
+ "static int __attribute__((cold)) func(int x) { return x; }" },
+ { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
+ "static int __attribute__((const)) func(int x) { return x; }" },
+ { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
+ "typedef short __attribute__((__may_alias__)) short_a;" },
+ { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
+ "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
+ { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,
+ "static int __attribute__((unused)) func(int x) { return x; }" },
+ { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL,
+ "static int __attribute__((used)) func(int x) { return x; }" },
+ { "HAVE_BIG_ENDIAN", EXECUTE, NULL,
+ "union { int i; char c[sizeof(int)]; } u;\n"
+ "u.i = 0x01020304;\n"
+ "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
+ { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H",
+ "#include <byteswap.h>\n"
+ "static int func(int x) { return bswap_64(x); }" },
+ { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL,
+ "return __builtin_choose_expr(1, 0, \"garbage\");" },
+ { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL,
+ "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
+ { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL,
+ "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
+ { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL,
+ "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
+ { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL,
+ "return __builtin_constant_p(1) ? 0 : 1;" },
+ { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL,
+ "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
+ { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL,
+ "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
+ { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL,
+ "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
+ { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL,
+ "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
+ { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL,
+ "#include <byteswap.h>\n" },
+ { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL,
+ "char **foo = (char *[]) { \"x\", \"y\", \"z\" };\n"
+ "return foo[0] ? 0 : 1;" },
+ { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL,
+ "for (int i = 0; i < argc; i++) { return 0; };\n"
+ "return 1;" },
+ { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL,
+ "#include <unistd.h>\n"
+ "static int func(void) { return getpagesize(); }" },
+ { "HAVE_LITTLE_ENDIAN", EXECUTE, NULL,
+ "union { int i; char c[sizeof(int)]; } u;\n"
+ "u.i = 0x01020304;\n"
+ "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
+ { "HAVE_MMAP", DEFINES_FUNC, NULL,
+ "#include <sys/mman.h>\n"
+ "static void *func(int fd) {\n"
+ " return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
+ "}" },
+ { "HAVE_NESTED_FUNCTIONS", DEFINES_FUNC, NULL,
+ "static int func(int val) {\n"
+ " auto void add(int val2);\n"
+ " void add(int val2) { val += val2; }\n"
+ " add(7);\n"
+ " return val;\n"
+ "}" },
+ { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL,
+ "return ({ int x = argc; x == argc ? 0 : 1; });" },
+ { "HAVE_TYPEOF", INSIDE_MAIN, NULL,
+ "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
+ { "HAVE_UTIME", DEFINES_FUNC, NULL,
+ "#include <sys/types.h>\n"
+ "#include <utime.h>\n"
+ "static int func(const char *filename) {\n"
+ " struct utimbuf times = { 0 };\n"
+ " return utime(filename, ×);\n"
+ "}" },
+ { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL,
+ "#include <sys/types.h>\n"
+ "#include <utime.h>\n"
+ "static __attribute__((warn_unused_result)) int func(int i) {\n"
+ " return i + 1;\n"
+ "}" },
+};
+
+static char *grab_fd(int fd)
+{
+ int ret;
+ size_t max, size = 0;
+ char *buffer;
+
+ max = 16384;
+ buffer = malloc(max+1);
+ while ((ret = read(fd, buffer + size, max - size)) > 0) {
+ size += ret;
+ if (size == max)
+ buffer = realloc(buffer, max *= 2);
+ }
+ if (ret < 0)
+ err(1, "reading from command");
+ buffer[size] = '\0';
+ return buffer;
+}
+
+static char *run(const char *cmd, int *exitstatus)
+{
+ pid_t pid;
+ int p[2];
+ char *ret;
+ int status;
+
+ if (pipe(p) != 0)
+ err(1, "creating pipe");
+
+ pid = fork();
+ if (pid == -1)
+ err(1, "forking");
+
+ if (pid == 0) {
+ if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
+ || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
+ || close(p[0]) != 0
+ || close(STDIN_FILENO) != 0
+ || open("/dev/null", O_RDONLY) != STDIN_FILENO)
+ exit(128);
+
+ status = system(cmd);
+ if (WIFEXITED(status))
+ exit(WEXITSTATUS(status));
+ /* Here's a hint... */
+ exit(128 + WTERMSIG(status));
+ }
+
+ close(p[1]);
+ ret = grab_fd(p[0]);
+ /* This shouldn't fail... */
+ if (waitpid(pid, &status, 0) != pid)
+ err(1, "Failed to wait for child");
+ close(p[0]);
+ if (WIFEXITED(status))
+ *exitstatus = WEXITSTATUS(status);
+ else
+ *exitstatus = -WTERMSIG(status);
+ return ret;
+}
+
+static char *connect_args(char *argv[], const char *extra)
+{
+ unsigned int i, len = strlen(extra) + 1;
+ char *ret;
+
+ for (i = 1; argv[i]; i++)
+ len += 1 + strlen(argv[i]);
+
+ ret = malloc(len);
+ len = 0;
+ for (i = 1; argv[i]; i++) {
+ strcpy(ret + len, argv[i]);
+ len += strlen(argv[i]);
+ ret[len++] = ' ';
+ }
+ strcpy(ret + len, extra);
+ return ret;
+}
+
+static struct test *find_test(const char *name)
+{
+ unsigned int i;
+
+ for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
+ if (strcmp(tests[i].name, name) == 0)
+ return &tests[i];
+ }
+ abort();
+}
+
+#define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
+#define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
+#define USE_FUNC_BOILERPLATE "(void)func;\n"
+#define MAIN_BODY_BOILERPLATE "return 0;\n"
+#define MAIN_END_BOILERPLATE "}\n"
+
+static bool run_test(const char *cmd, struct test *test)
+{
+ char *output;
+ FILE *outf;
+ int status;
+
+ if (test->done)
+ return test->answer;
+
+ if (test->depends && !run_test(cmd, find_test(test->depends))) {
+ test->answer = false;
+ test->done = true;
+ return test->answer;
+ }
+
+ outf = fopen(INPUT_FILE, "w");
+ if (!outf)
+ err(1, "creating %s", INPUT_FILE);
+
+ fprintf(outf, "%s", PRE_BOILERPLATE);
+ switch (test->style) {
+ case EXECUTE:
+ case INSIDE_MAIN:
+ fprintf(outf, "%s", MAIN_START_BOILERPLATE);
+ fprintf(outf, "%s", test->fragment);
+ fprintf(outf, "%s", MAIN_END_BOILERPLATE);
+ break;
+ case OUTSIDE_MAIN:
+ fprintf(outf, "%s", test->fragment);
+ fprintf(outf, "%s", MAIN_START_BOILERPLATE);
+ fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
+ fprintf(outf, "%s", MAIN_END_BOILERPLATE);
+ break;
+ case DEFINES_FUNC:
+ fprintf(outf, "%s", test->fragment);
+ fprintf(outf, "%s", MAIN_START_BOILERPLATE);
+ fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
+ fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
+ fprintf(outf, "%s", MAIN_END_BOILERPLATE);
+ break;
+ }
+ fclose(outf);
+
+ if (verbose > 1)
+ if (system("cat " INPUT_FILE) == -1);
+
+ output = run(cmd, &status);
+ if (status != 0) {
+ if (verbose)
+ printf("Compile fail for %s, status %i: %s\n",
+ test->name, status, output);
+ if (test->style == EXECUTE)
+ errx(1, "Test for %s did not compile:\n%s",
+ test->name, output);
+ test->answer = false;
+ free(output);
+ } else {
+ /* Compile succeeded. */
+ free(output);
+ /* We run INSIDE_MAIN tests for sanity checking. */
+ if (test->style == EXECUTE || test->style == INSIDE_MAIN) {
+ output = run("./" OUTPUT_FILE, &status);
+ if (test->style == INSIDE_MAIN && status != 0)
+ errx(1, "Test for %s failed with %i:\n%s",
+ test->name, status, output);
+ if (verbose && status)
+ printf("%s exited %i\n", test->name, status);
+ free(output);
+ }
+ test->answer = (status == 0);
+ }
+ test->done = true;
+ return test->answer;
+}
+
+int main(int argc, char *argv[])
+{
+ char *cmd;
+ char *default_args[] = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
+ unsigned int i;
+
+ if (argc > 1) {
+ if (strcmp(argv[1], "--help") == 0) {
+ printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
+ " <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
+ "Default: %s %s\n",
+ DEFAULT_COMPILER, DEFAULT_FLAGS);
+ exit(0);
+ }
+ if (strcmp(argv[1], "-v") == 0) {
+ argc--;
+ argv++;
+ verbose = 1;
+ } else if (strcmp(argv[1], "-vv") == 0) {
+ argc--;
+ argv++;
+ verbose = 2;
+ }
+ }
+
+ if (argc == 1)
+ argv = default_args;
+
+ cmd = connect_args(argv, "-o " OUTPUT_FILE " " INPUT_FILE);
+ for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
+ run_test(cmd, &tests[i]);
+
+ unlink(OUTPUT_FILE);
+ unlink(INPUT_FILE);
+
+ cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
+ printf("/* Generated by CCAN configurator */\n");
+ printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
+ printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd + strlen(argv[1]) + 1);
+ for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
+ printf("#define %s %u\n", tests[i].name, tests[i].answer);
+ return 0;
+}
projects / ccan / commitdiff