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What's the purpose of _GLIBCXX_LONG_DOUBLE_COMPAT?

From: "Tim Shen via libstdc++" <libstdc++ at gcc dot gnu dot org>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>
Date: Fri, 3 Mar 2017 14:26:49 -1000
Subject: What's the purpose of _GLIBCXX_LONG_DOUBLE_COMPAT?
Authentication-results: sourceware.org; auth=none
Reply-to: Tim Shen <timshen at google dot com>

Hi,

Recently I got a glitch on building libstdc++ 4.9 on
powerpc64le-linux-gnu with a set of flags that I haven't yet figure
out. :P

Specifically, I wonder what's the history behind
_GLIBCXX_LONG_DOUBLE_COMPAT? What's the purpose of it?

Thanks!


-- 
Regards,
Tim Shen

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