[CMake] Suddendly missing members when compiling on macOS Mojave

[Juan Sanchez]

I had an issue last week, where the isysroot setting was messed up, after I
had done an xcode update.

Even though I am using Mojave (10.14), instead of Catalina (10.15), xcode
has apparently upped the version number from 10.14 to 10.15.

 /Applications/Xcode.app/Contents/Developer/Platforms/
MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk

Creating a brand new build directory fixed the problem, since the cached
information concerning the compiler environment was invalid.

Regards,

Juan


On Fri, Nov 8, 2019 at 10:18 AM Ruben Di Battista <rubendibattista at gmail.com>
wrote:

> Hello,
>
> Tryign to compile a project that built correctly since now. I guess
> something changed on my system, and now I’m getting this error:
>
> Scanning dependencies of target Mercurve
> /Applications/Xcode.app/Contents/Developer/usr/bin/make -f
> src/libs/CMakeFiles/Mercurve.dir/build.make
> src/libs/CMakeFiles/Mercurve.dir/build
> [  4%] Building CXX object
> src/libs/CMakeFiles/Mercurve.dir/BlockMerger.cxx.o
> cd /Users/rubendibattista/git/x/Mercurve/build/src/libs &&
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
>  -DMercurve_EXPORTS -I/Users/rubendibattista/git/x/Mercurve/src/libs
> -isystem /opt/local/include/vtk-8.1 -isystem /opt/local/include -isystem
> /opt/local/include/mpich-mp -isystem /opt/local/include/libxml2  -isysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk
> -mmacosx-version-min=10.14 -fPIC   -std=gnu++11 -o
> CMakeFiles/Mercurve.dir/BlockMerger.cxx.o -c
> /Users/rubendibattista/git/x/Mercurve/src/libs/BlockMerger.cxx
> In file included from
> /Users/rubendibattista/git/x/Mercurve/src/libs/BlockMerger.cxx:21:
> In file included from
> /Users/rubendibattista/git/x/Mercurve/src/libs/BlockMerger.h:28:
> In file included from
> /Users/rubendibattista/git/x/Mercurve/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
> using ::signbit;
>       ~~^
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:315:9:
> error: no member named 'fpclassify' in the global namespace
> using ::fpclassify;
>       ~~^
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:316:9:
> error: no member named 'isfinite' in the global namespace
>
> Something got messed up with Xcode update I guess. I also tried to
> downgrade Xcode without success. Does anyone have hints on how to solve
> this? In particular I’m not entirely sure that the `-isysroot` flag the
> cmake provides is correct anymore. Is that possible?
>
>           _
> -.     .´  |∞∞∞∞
>   ',  ;    |∞∞∞∞∞∞
>     ˜˜     |∞∞∞∞∞∞∞∞∞ RdB
>     ,.,    |∞∞∞∞∞∞
>   .'   '.  |∞∞∞∞
> -'       `’
> https://rdb.is
>
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