netgen fails to build with clangs on Catalina and below: error: member reference base type 'MakeSimdCl' is not a structure or union

[barracuda156]

​https://build.macports.org/builders/ports-10.15_x86_64-builder/builds/236017/steps/install-port/logs/stdio

[ 18%] Building CXX object CMakeFiles/nglib.dir/libsrc/general/hashtabl.cpp.o
/usr/bin/clang++ -DFFMPEG -DHAVE_DLFCN_H -DJPEGLIB -DNETGEN_PYTHON -DNG_PYTHON -DPYBIND11_SIMPLE_GIL_MANAGEMENT -D__STDC_CONSTANT_MACROS -Dnglib_EXPORTS -I/opt/local/var/macports/build/netgen-5d323cae/work/build -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604 -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/include -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include -I/opt/local/include -I/opt/local/Library/Frameworks/Python.framework/Versions/3.14/include/python3.14 -pipe -Os -DNDEBUG -I/opt/local/include -stdlib=libc++ -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -std=gnu++17 -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -mmacosx-version-min=10.15 -fPIC -fvisibility=hidden -MD -MT CMakeFiles/nglib.dir/rules/rule_triarules.cpp.o -MF CMakeFiles/nglib.dir/rules/rule_triarules.cpp.o.d -o CMakeFiles/nglib.dir/rules/rule_triarules.cpp.o -c /opt/local/var/macports/build/netgen-5d323cae/work/build/rules/rule_triarules.cpp
/usr/bin/clang++ -DFFMPEG -DHAVE_DLFCN_H -DJPEGLIB -DNETGEN_PYTHON -DNG_PYTHON -DPYBIND11_SIMPLE_GIL_MANAGEMENT -D__STDC_CONSTANT_MACROS -Dnglib_EXPORTS -I/opt/local/var/macports/build/netgen-5d323cae/work/build -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604 -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/include -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include -I/opt/local/include -I/opt/local/Library/Frameworks/Python.framework/Versions/3.14/include/python3.14 -pipe -Os -DNDEBUG -I/opt/local/include -stdlib=libc++ -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -std=gnu++17 -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -mmacosx-version-min=10.15 -fPIC -fvisibility=hidden -MD -MT CMakeFiles/nglib.dir/libsrc/general/hashtabl.cpp.o -MF CMakeFiles/nglib.dir/libsrc/general/hashtabl.cpp.o.d -o CMakeFiles/nglib.dir/libsrc/general/hashtabl.cpp.o -c /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/hashtabl.cpp
[ 19%] Building CXX object CMakeFiles/nglib.dir/libsrc/general/mystring.cpp.o
/usr/bin/clang++ -DFFMPEG -DHAVE_DLFCN_H -DJPEGLIB -DNETGEN_PYTHON -DNG_PYTHON -DPYBIND11_SIMPLE_GIL_MANAGEMENT -D__STDC_CONSTANT_MACROS -Dnglib_EXPORTS -I/opt/local/var/macports/build/netgen-5d323cae/work/build -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604 -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/include -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc -I/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include -I/opt/local/include -I/opt/local/Library/Frameworks/Python.framework/Versions/3.14/include/python3.14 -pipe -Os -DNDEBUG -I/opt/local/include -stdlib=libc++ -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -std=gnu++17 -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -mmacosx-version-min=10.15 -fPIC -fvisibility=hidden -MD -MT CMakeFiles/nglib.dir/libsrc/general/mystring.cpp.o -MF CMakeFiles/nglib.dir/libsrc/general/mystring.cpp.o.d -o CMakeFiles/nglib.dir/libsrc/general/mystring.cpp.o -c /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/mystring.cpp
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/hashtabl.cpp:13:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include/myadt.hpp:1:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include/../general/myadt.hpp:16:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/../include/mydefs.hpp:14:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/core/ngcore.hpp:16:
/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/core/simd.hpp:98:62: error: member reference base type 'MakeSimdCl' is not a structure or union
  auto MakeSimd (std::array<T,S> aa)  { return MakeSimdCl(aa).Get(); }
                                               ~~~~~~~~~~~~~~^~~~
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/gzstream.cpp:30:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include/myadt.hpp:1:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include/../general/myadt.hpp:16:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/../include/mydefs.hpp:14:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/core/ngcore.hpp:16:
/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/core/simd.hpp:98:62: error: member reference base type 'MakeSimdCl' is not a structure or union
  auto MakeSimd (std::array<T,S> aa)  { return MakeSimdCl(aa).Get(); }
                                               ~~~~~~~~~~~~~~^~~~
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/mystring.cpp:19:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include/myadt.hpp:1:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/include/../general/myadt.hpp:16:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/general/../include/mydefs.hpp:14:
In file included from /opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/core/ngcore.hpp:16:
/opt/local/var/macports/build/netgen-5d323cae/work/netgen-6.2.2604/libsrc/core/simd.hpp:98:62: error: member reference base type 'MakeSimdCl' is not a structure or union
  auto MakeSimd (std::array<T,S> aa)  { return MakeSimdCl(aa).Get(); }
                                               ~~~~~~~~~~~~~~^~~~
1 error generated.
make[2]: *** [CMakeFiles/nglib.dir/libsrc/general/hashtabl.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
1 error generated.
make[2]: *** [CMakeFiles/nglib.dir/libsrc/general/gzstream.cpp.o] Error 1
1 error generated.
make[2]: *** [CMakeFiles/nglib.dir/libsrc/general/mystring.cpp.o] Error 1
make[2]: Leaving directory `/opt/local/var/macports/build/netgen-5d323cae/work/build'
make[1]: *** [CMakeFiles/nglib.dir/all] Error 2