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Re: signbit issues

From: Paul Eggert
Subject: Re: signbit issues
Date: Fri, 19 Feb 2016 11:45:33 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0

On 02/19/2016 11:32 AM, Orion Poplawski wrote:
g++ -DHAVE_CONFIG_H -I. -I..  -I../lib   -g -O2 -MT foobar.o -MD -MP -MF
.deps/foobar.Tpo -c -o foobar.o foobar.cpp
In file included from foobar.cpp:3:0:
../lib/math.h: In function ‘int signbit(float)’:
../lib/math.h:2576:1: error: ‘int signbit(float)’ conflicts with a previous
This is a C++ thing, plus I don't have GCC 6, so I'm afraid you'll have to do most of the legwork.

Why was Gnulib trying to define its own signbit function? Why didn't the signbit function from GCC 6 pass Gnulib's test? Look in config.log to find out. On my platform (Fedora 23, GCC 5.3.1) signbit passes all the tests so there's no reason for Gnulib to try to substitute its own.

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