compiler: don't override existing definitions.

[ccan] / tools / configurator / configurator.c

diff --git a/tools/configurator/configurator.c b/tools/configurator/configurator.c
index b78b112f4a9f0b523de52a4b212bc12b17fa9fad..7b3403a9d96d50ca43b25abcc0143808f95e1cab 100644 (file)
--- a/tools/configurator/configurator.c
+++ b/tools/configurator/configurator.c
@@ -394,7 +394,9 @@ int main(int argc, const char *argv[])
        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", cmd + strlen(argv[1]) + 1);
        for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)