template inst issue with DataWrapper<conduit::Node>

[cyrush]

macOS gcc 10, this statement causes multiple symbols undermine static builds:

ascent/src/flow/flow_data.hpp

Line 174 in 132bd62

template class FLOW_API DataWrapper<conduit::Node>;

This was added when we switched to hide symbols to fix an error where python flow failed to detect types.

Ideally we shouldn't need this, but I wonder if there is an issue with symbol visibility in the client using ascent.

Haven't been able to duplicate, tried gcc 10 on ubuntu 20.10.

[mlohry]

Hi @cyrush , I actually just ran into this on latest develop branch on MacOS with gcc-12. Any idea for a workaround?

[2/123] Linking CXX shared library lib/libascent_flow.dylib
FAILED: lib/libascent_flow.dylib 
: && /opt/homebrew/bin/g++-12 -O3 -DNDEBUG -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.0.sdk -mmacosx-version-min=13.6 -dynamiclib -Wl,-headerpad_max_install_names -Wl,-ld_classic -o lib/libascent_flow.dylib -install_name @rpath/libascent_flow.dylib libs/flow/CMakeFiles/ascent_flow.dir/flow_data.cpp.o libs/flow/CMakeFiles/ascent_flow.dir/flow_registry.cpp.o libs/flow/CMakeFiles/ascent_flow.dir/flow_filter.cpp.o libs/flow/CMakeFiles/ascent_flow.dir/flow_filters.cpp.o libs/flow/CMakeFiles/ascent_flow.dir/flow_graph.cpp.o libs/flow/CMakeFiles/ascent_flow.dir/flow_workspace.cpp.o libs/flow/CMakeFiles/ascent_flow.dir/flow_timer.cpp.o libs/flow/CMakeFiles/ascent_flow.dir/filters/flow_builtin_filters.cpp.o  -Wl,-rpath,/Users/mlohry/dev/in-situ-parallel-post/cmake-build-release/tpl_install/lib  /Users/mlohry/dev/in-situ-parallel-post/cmake-build-release/tpl_install/lib/libconduit_relay.dylib  /Users/mlohry/dev/in-situ-parallel-post/cmake-build-release/tpl_install/lib/libconduit_blueprint.dylib  /Users/mlohry/dev/in-situ-parallel-post/cmake-build-release/tpl_install/lib/libconduit.dylib  /Users/mlohry/dev/in-situ-parallel-post/cmake-build-release/tpl_install/lib/libhdf5.310.3.0.dylib  /Users/mlohry/usr/local/lib/libmpi.dylib && :
-macosx_version_min has been renamed to -macos_version_min
duplicate symbol '__ZTSN4flow11DataWrapperIN7conduit4NodeEEE' in:
    libs/flow/CMakeFiles/ascent_flow.dir/flow_data.cpp.o
    libs/flow/CMakeFiles/ascent_flow.dir/flow_registry.cpp.o