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[v3] Remove constexpr from frexp, modf, remquo

From: Paolo Carlini <paolo dot carlini at oracle dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: libstdc++ <libstdc++ at gcc dot gnu dot org>
Date: Mon, 14 Nov 2011 12:32:09 +0100
Subject: [v3] Remove constexpr from frexp, modf, remquo

Hi,

Daniel noticed that in <cmath> we have functions marked constexpr which aren't really viable anyway due to the pointer parameter. Seems basically harmless given our way to deal with these matters, but I agree can be misleading. Tested x86_64-linux, committed.

Paolo.

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