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rgb-cln/ccan/tools/configurator/configurator.c

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/* Simple tool to create config.h.
* Would be much easier with ccan modules, but deliberately standalone.
*
* Copyright 2011 Rusty Russell <rusty@rustcorp.com.au>. MIT license.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#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 "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
#define OUTPUT_FILE "configurator.out"
#define INPUT_FILE "configuratortest.c"
static int verbose;
enum test_style {
OUTSIDE_MAIN = 0x1,
DEFINES_FUNC = 0x2,
INSIDE_MAIN = 0x4,
DEFINES_EVERYTHING = 0x8,
MAY_NOT_COMPILE = 0x10,
EXECUTE = 0x8000
};
struct test {
const char *name;
enum test_style style;
const char *depends;
const char *link;
const char *fragment;
const char *overrides; /* On success, force this to '1' */
bool done;
bool answer;
};
static struct test tests[] = {
{ "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
"#include <sys/types.h>\n"
"int main(int argc, char *argv[]) {\n"
" return sizeof(off_t) == 4 ? 0 : 1;\n"
"}\n" },
{ "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
"return __alignof__(double) > 0 ? 0 : 1;" },
{ "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
"#define _GNU_SOURCE\n"
"#include <stdio.h>\n"
"static char *func(int x) {"
" char *p;\n"
" if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
" return p;\n"
"}" },
{ "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
"static int __attribute__((cold)) func(int x) { return x; }" },
{ "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
"static int __attribute__((const)) func(int x) { return x; }" },
{ "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
"static int __attribute__((pure)) func(int x) { return x; }" },
{ "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
"typedef short __attribute__((__may_alias__)) short_a;" },
{ "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
"#include <stdlib.h>\n"
"static void __attribute__((noreturn)) func(int x) { exit(x); }" },
{ "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
"static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
{ "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
"static int __attribute__((unused)) func(int x) { return x; }" },
{ "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
"static int __attribute__((used)) func(int x) { return x; }" },
{ "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
"#include <execinfo.h>\n"
"static int func(int x) {"
" void *bt[10];\n"
" return backtrace(bt, 10) < x;\n"
"}" },
{ "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, 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", NULL,
"#include <byteswap.h>\n"
"static int func(int x) { return bswap_64(x); }" },
{ "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
"return __builtin_choose_expr(1, 0, \"garbage\");" },
{ "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
"return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
{ "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
"return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
{ "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
"return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
{ "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
"return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
{ "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
"return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
{ "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
"return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
{ "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
"return __builtin_constant_p(1) ? 0 : 1;" },
{ "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
"return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
{ "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
"return __builtin_ffs(0) == 0 ? 0 : 1;" },
{ "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
"return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
{ "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
"return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
{ "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
"return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
{ "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
"return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
{ "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
"#include <intrinsics.h>\n"
"int func(int v) {\n"
" return __CLZ(__RBIT(v));\n"
"}" },
{ "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
"#include <byteswap.h>\n" },
{ "HAVE_CLOCK_GETTIME",
DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
"#include <time.h>\n"
"static struct timespec func(void) {\n"
" struct timespec ts;\n"
" clock_gettime(CLOCK_REALTIME, &ts);\n"
" return ts;\n"
"}\n" },
{ "HAVE_CLOCK_GETTIME_IN_LIBRT",
DEFINES_FUNC,
"HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
"-lrt",
"#include <time.h>\n"
"static struct timespec func(void) {\n"
" struct timespec ts;\n"
" clock_gettime(CLOCK_REALTIME, &ts);\n"
" return ts;\n"
"}\n",
/* This means HAVE_CLOCK_GETTIME, too */
"HAVE_CLOCK_GETTIME" },
{ "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
"int *foo = (int[]) { 1, 2, 3, 4 };\n"
"return foo[0] ? 0 : 1;" },
{ "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
"#include <sys/types.h>\n"
"#include <sys/stat.h>\n"
"#include <fcntl.h>\n"
"#include <unistd.h>\n"
"int main(void) {\n"
" int fd = open(\"..\", O_RDONLY);\n"
" return fchdir(fd) == 0 ? 0 : 1;\n"
"}\n" },
{ "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
"#include <err.h>\n"
"static void func(int arg) {\n"
" if (arg == 0)\n"
" err(1, \"err %u\", arg);\n"
" if (arg == 1)\n"
" errx(1, \"err %u\", arg);\n"
" if (arg == 3)\n"
" warn(\"warn %u\", arg);\n"
" if (arg == 4)\n"
" warnx(\"warn %u\", arg);\n"
"}\n" },
{ "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
"HAVE_32BIT_OFF_T", NULL,
"#define _FILE_OFFSET_BITS 64\n"
"#include <sys/types.h>\n"
"int main(int argc, char *argv[]) {\n"
" return sizeof(off_t) == 8 ? 0 : 1;\n"
"}\n" },
{ "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
"for (int i = 0; i < argc; i++) { return 0; };\n"
"return 1;" },
{ "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
"struct foo { unsigned int x; int arr[]; };" },
{ "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
"#include <unistd.h>\n"
"static int func(void) { return getpagesize(); }" },
{ "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
"#define _GNU_SOURCE\n"
"#include <ctype.h>\n"
"static int func(void) { return isblank(' '); }" },
{ "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, 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_MEMMEM", DEFINES_FUNC, NULL, NULL,
"#define _GNU_SOURCE\n"
"#include <string.h>\n"
"static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
"return memmem(h, hl, n, nl);"
"}\n", },
{ "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
"#define _GNU_SOURCE\n"
"#include <string.h>\n"
"static void *func(void *s, int c, size_t n) {\n"
"return memrchr(s, c, n);"
"}\n", },
{ "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
"#include <sys/mman.h>\n"
"static void *func(int fd) {\n"
" return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
"}" },
{ "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
"#include <sys/types.h>\n"
"#include <sys/stat.h>\n"
"#include <fcntl.h>\n"
"int main(void) {\n"
" return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
"}\n" },
{ "HAVE_QSORT_R_PRIVATE_LAST",
DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
"#define _GNU_SOURCE 1\n"
"#include <stdlib.h>\n"
"static int cmp(const void *lp, const void *rp, void *priv) {\n"
" *(unsigned int *)priv = 1;\n"
" return *(const int *)lp - *(const int *)rp; }\n"
"int main(void) {\n"
" int array[] = { 9, 2, 5 };\n"
" unsigned int called = 0;\n"
" qsort_r(array, 3, sizeof(int), cmp, &called);\n"
" return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
"}\n" },
{ "HAVE_STRUCT_TIMESPEC",
DEFINES_FUNC, NULL, NULL,
"#include <time.h>\n"
"static void func(void) {\n"
" struct timespec ts;\n"
" ts.tv_sec = ts.tv_nsec = 1;\n"
"}\n" },
{ "HAVE_SECTION_START_STOP",
DEFINES_FUNC, NULL, NULL,
"static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
"static int func(void) {\n"
" extern void *__start_mysec[], *__stop_mysec[];\n"
" return __stop_mysec - __start_mysec;\n"
"}\n" },
{ "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
"static long nest(const void *base, unsigned int i)\n"
"{\n"
" if (i == 0)\n"
" return (const char *)&i - (const char *)base;\n"
" return nest(base, i-1);\n"
"}\n"
"int main(int argc, char *argv[]) {\n"
" return (nest(&argc, argc) > 0) ? 0 : 1\n;"
"}\n" },
{ "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
"return ({ int x = argc; x == argc ? 0 : 1; });" },
{ "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
"#include <sys/filio.h>\n" },
{ "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
"#include <sys/termios.h>\n" },
{ "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
"__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
{ "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
"#include <string.h>\n"
"int main(int argc, char *argv[]) {\n"
" char pad[sizeof(int *) * 1];\n"
" strncpy(pad, argv[0], sizeof(pad));\n"
" return *(int *)(pad) == *(int *)(pad + 1);\n"
"}\n" },
{ "HAVE_UTIME", DEFINES_FUNC, NULL, 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, &times);\n"
"}" },
{ "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, 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(const 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]);
if (argv[i+1])
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) {
size_t len;
const char *deps = test->depends;
char *dep;
/* Space-separated dependencies, could be ! for inverse. */
while ((len = strcspn(deps, " "))) {
bool positive = true;
if (deps[len]) {
dep = strdup(deps);
dep[len] = '\0';
} else {
dep = (char *)deps;
}
if (dep[0] == '!') {
dep++;
positive = false;
}
if (run_test(cmd, find_test(dep)) != positive) {
test->answer = false;
test->done = true;
return test->answer;
}
deps += len;
deps += strspn(deps, " ");
}
}
outf = fopen(INPUT_FILE, "w");
if (!outf)
err(1, "creating %s", INPUT_FILE);
fprintf(outf, "%s", PRE_BOILERPLATE);
switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
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;
case DEFINES_EVERYTHING:
fprintf(outf, "%s", test->fragment);
break;
default:
abort();
}
fclose(outf);
if (verbose > 1)
if (system("cat " INPUT_FILE) == -1);
if (test->link) {
char *newcmd;
newcmd = malloc(strlen(cmd) + strlen(" ")
+ strlen(test->link) + 1);
sprintf(newcmd, "%s %s", cmd, test->link);
if (verbose > 1)
printf("Extra link line: %s", newcmd);
cmd = newcmd;
}
output = run(cmd, &status);
if (status != 0 || strstr(output, "warning")) {
if (verbose)
printf("Compile %s for %s, status %i: %s\n",
status ? "fail" : "warning",
test->name, status, output);
if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
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 & EXECUTE) && 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;
if (test->answer && test->overrides) {
struct test *override = find_test(test->overrides);
override->done = true;
override->answer = true;
}
return test->answer;
}
int main(int argc, const char *argv[])
{
char *cmd;
unsigned int i;
const char *default_args[]
= { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
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);
printf("/* Generated by CCAN configurator */\n"
"#ifndef CCAN_CONFIG_H\n"
"#define CCAN_CONFIG_H\n");
printf("#ifndef _GNU_SOURCE\n");
printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
printf("#endif\n");
printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
printf("#define CCAN_CFLAGS \"%s\"\n\n", connect_args(argv+1, ""));
/* This one implies "#include <ccan/..." works, eg. for tdb2.h */
printf("#define HAVE_CCAN 1\n");
for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
printf("#define %s %u\n", tests[i].name, tests[i].answer);
printf("#endif /* CCAN_CONFIG_H */\n");
return 0;
}
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