diff options
Diffstat (limited to 'posix/getopt.h')
| -rw-r--r-- | posix/getopt.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/posix/getopt.h b/posix/getopt.h index aec5d92a3d..12b7ad568e 100644 --- a/posix/getopt.h +++ b/posix/getopt.h @@ -23,10 +23,16 @@ # define _GETOPT_H 1 #endif -/* We include this here since on system susing GNU libc we need some - macros defined. <stdio.h> is probably the most portable header - file and it does what we need. */ -#include <stdio.h> +/* If __GNU_LIBRARY__ is not already defined, either we are being used + standalone, or this is the first header included in the source file. + If we are being used with glibc, we need to include <features.h>, but + that does not exist if we are standalone. So: if __GNU_LIBRARY__ is + not defined, include <ctype.h>, which will pull in <features.h> for us + if it's from glibc. (Why ctype.h? It's guaranteed to exist and it + doesn't flood the namespace with stuff the way some other headers do.) */ +#if !defined __GNU_LIBRARY__ +# include <ctype.h> +#endif #ifdef __cplusplus extern "C" { |