Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Thu, 10 Mar 2016 14:13:20 -0500
From: Rich Felker <>
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.


Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.