config.h: idempotent-wrap the generated config.h

[ccan] / tools / configurator / configurator.c

diff --git a/tools/configurator/configurator.c b/tools/configurator/configurator.c
index 7d9db8a1b407928810f3195b8f1a63d4bd82a366..b150dadb56d99f9e21bb4702b1f9af0e3e943bb6 100644 (file)
--- a/tools/configurator/configurator.c
+++ b/tools/configurator/configurator.c
@@ -337,10 +337,13 @@ int main(int argc, char *argv[])
        unlink(INPUT_FILE);
 
        cmd[strlen(cmd) - strlen(" -o " OUTPUT_FILE " " INPUT_FILE)] = '\0';
-       printf("/* Generated by CCAN configurator */\n");
+       printf("#ifndef CCAN_CONFIG_H\n"
+              "#define CCAN_CONFIG_H\n"
+              "/* 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);
+       printf("#endif /* CCAN_CONFIG_H */\n");
        return 0;
 }