[Bug libstdc++/61143] [4.9/4.10 Regression] Arithmetic exception on emplacing into unordered_map moved out

["daniel.kruegler at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61143

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

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--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The problem also occurs in gcc 4.10 trunk and I can confirm that this wasn't
the case for 4.7.3, 4.8.1, 4.8.2.
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Subject: [Bug bootstrap/25672] [4.7/4.8/4.9/4.10 Regression] cross build's libgcc picks up CFLAGS
Date: Sun, 11 May 2014 12:28:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id%672

Oleg Endo <olegendo at gcc dot gnu.org> changed:

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--- Comment #35 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Just ran into the same issue with trunk r210305, while building a cross SH on
OSX.  The newly merged wide-int code contains some things, which clang
considers an error.  Setting
export CFLAGS="-fheinous-gnu-extensions"
export CXXFLAGS="-fheinous-gnu-extensions"

fixes that, but then one need also to set e.g.
export CFLAGS_FOR_TARGET="-O2"
export CXXFLAGS_FOR_TARGET="-O2"

or else -fheinous-gnu-extensions will be passed to the xgcc.
This really should be documented somewhere...