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?
>
> _
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> ˜˜ |∞∞∞∞∞∞∞∞∞ RdB
> ,., |∞∞∞∞∞∞
> .' '. |∞∞∞∞
> -' `’
>
> https://rdb.is
