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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/63235] building fails with --disable-bootstrap
Date: Fri, 12 Sep 2014 19:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63235

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Andi Kleen from comment #8)
> Yes it doesn't happen when compiling with 4.8 branch tip. So has been fixed.
> 
> Anyways i'm still going to submit the patch to make the opensuse 13.1 build
> work again. I don't think it should hurt anything here to use ifdef.

The difference is run-time check vs compile-time check.