On Mon, Nov 28, 2011 at 07:37:53PM +0100, Svante Signell wrote:
> 
> Checking for HAVE_MSYNC helps because configure finds the stub and
> decides it is not usable, see below.

Um, how does configure find the stub if you're just doing an

AC_CHECK_FUNCS(... msync ...)

That just checks if a function can link against msync() and not fail.
It's not going to cause configure to go peering deeply into header
files.  Are you proposing that we use some specific autoconf macro?
If so, which macro?  Your patch just uses AC_CHECK_FUNCS, which
doesn't have any kind of hueristic magic or artificial intelligence
capabilities as far as I know....

                                - Ted



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