Date: Thu, 10 Mar 2016 20:01:10 +0000 From: Jeroen Ketema <jeroen@...eplay.com> To: musl@...ts.openwall.com Subject: Re: Using libcxx with musl's math.h Hi Rich, Thanks for your quick answer. Digging a bit deeper, it turns out that libcxx comes with it’s own math.h, which uses #include_next to include the C library's math.h. I totally missed this the first time through libcxx’s headers. Sorry for the noise. Best, Jeroen > On 10 Mar 2016, at 19:13, Rich Felker <dalias@...c.org> wrote: > > 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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