[PATCH xrdb] Call C preprocessor with -P option (changed behaviour in GCC 4.5)

[Adam Jackson]

On Tue, 2010-12-28 at 16:58 +0100, Ulrich Mueller wrote:
> http://bugs.freedesktop.org/show_bug.cgi?id=32701
> http://bugs.gentoo.org/show_bug.cgi?id=347758
> 
> Signed-off-by: Ulrich Mueller <ulm at gentoo.org>

This looks like a safe change in that all the extant cpp's seem to
accept -P with the same semantics (checked gcc, mcpp, and Solaris).  But
it leaks until exit, and it doesn't apply the -P if you do xrdb -cpp
foo, which seems wrong.

- ajax
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