Re: signbit issues

[Paul Eggert]

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
> declaration
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.