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Message-ID: <20160310191320.GP9349@brightrain.aerifal.cx>
Date: Thu, 10 Mar 2016 14:13:20 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Using libcxx with musl's math.h
On Thu, Mar 10, 2016 at 06:46:12PM +0000, Jeroen Ketema wrote:
> Hello,
>
> I'm trying to use libcxx's cmath header together with musl's math.h.
> However this currently fails, because libcxx expects certain symbols
> to be functions, while musl defines them as macros. For example
> (compiling with clang):
>
> cmath:309:9: error: no member named 'signbit' in the global
> namespace; did you mean '__signbit'?
> using ::signbit;
> ~~^
>
> where signbit is a macro in musl, but where libcxx expects it to be
> a function.
>
> My question is: what would be the proper way to fix this? The main
> issue being of course that I cannot simply define signbit to be a
> function, because it requires a form of overloading.
I think this is a libcxx bug. C requires signbit to be a macro. If C++
has different requirements then the C++ implementation should be
providing an overlay header that satisfies them.
Rich
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