Minor change to silence complaints from cpp
bde at zeta.org.au
Mon Oct 6 06:42:56 PDT 2003
On Mon, 6 Oct 2003, Jukka A. Ukkonen wrote:
> E.g. when compiling X-server cpp has been complaining about
> _POSIX_C_SOURCE not being defined. This was easily silenced
> with the following minor change...
This seems to be a bug or a feature in the X server's Makefile. It
apparently uses -Wundef to generate warnings about the Standard C
feature of undefined identifiers having value 0 in cpp expressions.
> --- /usr/include/sys/cdefs.h.orig Mon Oct 6 10:26:47 2003
> +++ /usr/include/sys/cdefs.h Mon Oct 6 10:28:06 2003
> @@ -270,13 +270,13 @@
> /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
> -#if _POSIX_C_SOURCE == 1
> +#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE == 1)
> #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
> #define _POSIX_C_SOURCE 199009
> /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
> -#if _POSIX_C_SOURCE == 2
> +#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE == 2)
> #undef _POSIX_C_SOURCE
> #define _POSIX_C_SOURCE 199209
I'd prefer not to uglify the system headers to support -Wundef.
Most warnings in system headers including ones from -Wundef can be
suppressed using -Wno-system-headers. -Wno-system-headers is the FSF
default but FreeBSD reverses this.
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