configure: Use -Wundef if supported by the compiler.

Alexandre Julliard julliard at
Tue Jan 4 05:36:34 CST 2011

Gerald Pfeifer <gerald at> writes:

> Checking this via autoconf sounds a bit involved.  Do you have a
> recommendation?  Perhaps just wait until "Alexandre runs bison 2.4.2
> or later on all his machines"? ;-)

Yes, but maybe filing a bug with Debian could help speeding up the

Alexandre Julliard
julliard at

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