Ehi Mojca, 

Thanks for the message. :)

I managed to fix it. I got confused because recently I updated Xcode, but in 
facts the problem was completely unrelated: I had a project header file named 
“math.h”. :) Very noob mistake! Interestingly enough, this bug does not pop-out 
on Linux (using GCC). 

So I just renamed “math.h” to a custom name, and now everything is back as 
before (Ah, pay attention! Most of macOS systems have a case-insensitive 
filesystem… I firstly renamed the file from “math.h” -> “Math.h”, but it didn’t 
work either and it took a while to realize that on macOS “math.h” and “Math.h” 
are the same if the FS is case-insensitive. 

In any case thanks for your help! :)

          _   
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  ',  ;    |∞∞∞∞∞∞
    ˜˜     |∞∞∞∞∞∞∞∞∞ RdB
    ,.,    |∞∞∞∞∞∞
  .'   '.  |∞∞∞∞
-'       `’

https://rdb.is

On 8 November 2019 at 18:32:13, Mojca Miklavec (mo...@macports.org) wrote:

Dear Ruben,  

This definitely looks like a bug in Xcode. I would suggest you to file  
a bug report to Apple.  

Can you please try to compile a simple hello world with just the  
following contents  

// test.cpp:  
#include <unordered_map>  
int main() { return 0; }  

and compile it with:  
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
  
test.cpp \  
-isysroot 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
  

Mojca  

On Fri, 8 Nov 2019 at 15:27, Ruben Di Battista  
<rubendibatti...@gmail.com> wrote:  
>  
> Hello people,  
>  
> I saw this kind of errors quite often lately around. But this times I’m 
> hitting this with a local project, not a port in Macports. A project that 
> used to build correctly with Xcode 10, now it seems to miss stuff in <cmath> 
> header.  
>  
> ninja -j 1  
> [1/48] Building CXX object src/libs/CMakeFiles/Mercurve.dir/BlockMerger.cxx.o 
>  
> FAILED: src/libs/CMakeFiles/Mercurve.dir/BlockMerger.cxx.o  
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
>  -DMercurve_EXPORTS -I../src/libs -isystem /opt/local/include/vtk-8.1 
> -isystem /opt/local/include -isystem /opt/local/include/mpich-mp -isystem 
> /opt/local/include/libxml2 -g -isysroot 
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
>  -mmacosx-version-min=10.14 -fPIC -Wall -Wno-long-long -pedantic 
> -fcolor-diagnostics -std=gnu++11 -MD -MT 
> src/libs/CMakeFiles/Mercurve.dir/BlockMerger.cxx.o -MF 
> src/libs/CMakeFiles/Mercurve.dir/BlockMerger.cxx.o.d -o 
> src/libs/CMakeFiles/Mercurve.dir/BlockMerger.cxx.o -c 
> ../src/libs/BlockMerger.cxx  
> In file included from ../src/libs/BlockMerger.cxx:21:  
> In file included from ../src/libs/BlockMerger.h:28:  
> In file included from ../src/libs/types.h:25:  
> In file included from 
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/unordered_set:363:
>   
> In file included from 
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__hash_table:19:
>   
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:314:9:
>  error: no member named 'signbit' in the global namespace  
> […]  
>  
> I read a bit the tickets of other ports, but they don’t fit exactly with what 
> I have. Any fast hint? Do I need to downgrade Xcode?  
>  
> _  
> -. .´ |∞∞∞∞  
> ', ; |∞∞∞∞∞∞  
> ˜˜ |∞∞∞∞∞∞∞∞∞ RdB  
> ,., |∞∞∞∞∞∞  
> .' '. |∞∞∞∞  
> -' `’  
>  
> https://rdb.is  

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