XCode 11 on Mojave problem, again

[Mojca Miklavec]

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
<rubendibattista at 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?
>
>           _
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>
> https://rdb.is