config.h: HAVE_ASPRINTF

[ccan] / tools / configurator / configurator.c

diff --git a/tools/configurator/configurator.c b/tools/configurator/configurator.c
index b150dadb56d99f9e21bb4702b1f9af0e3e943bb6..85842cedba84301709ffc0764943c6d667ada107 100644 (file)
--- a/tools/configurator/configurator.c
+++ b/tools/configurator/configurator.c
@@ -38,6 +38,14 @@ struct test {
 static struct test tests[] = {
        { "HAVE_ALIGNOF", INSIDE_MAIN, NULL,
          "return __alignof__(double) > 0 ? 0 : 1;" },
+       { "HAVE_ASPRINTF", DEFINES_FUNC, 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,
          "static int __attribute__((cold)) func(int x) { return x; }" },
        { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL,
@@ -337,9 +345,10 @@ int main(int argc, char *argv[])
        unlink(INPUT_FILE);
 
        cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
-       printf("#ifndef CCAN_CONFIG_H\n"
-              "#define CCAN_CONFIG_H\n"
-              "/* Generated by CCAN configurator */\n");
+       printf("/* Generated by CCAN configurator */\n"
+              "#ifndef CCAN_CONFIG_H\n"
+              "#define CCAN_CONFIG_H\n");
+       printf("#define _GNU_SOURCE /* Always use GNU extensions. */\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++)