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[Patch] disable __cxa_atexit when unsupported

Hello,

this patchlet to configure checks whether __cxa_atexit
is supported before allowing it to be enabled. If you
don't explicitly enable it, there's no change compared
to current behavior. If you do enable it however, it
does a basic check to see whether the functionality is
supported. This fixes the problem reported in
bootstrap/9249 where somebody built the compile with
__cxa_atexit on a system that didn't support it, and
got a broken build halfway through. Tested on
i686-linux, sparc-solaris and ppc-darwin by visual
inspection of auto-host.h. Please apply to
3.4-branch/mainline if okay. Thanks,

Dara

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Attachment: 9249-2.patch
Description: 9249-2.patch

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