Building as shared library - Indirect_Predicates questions #3
Description
Starting to work in a fork at building the InteractiveAndRobustMeshBooleans (IRMB) code as a shared library on Linux, I ran into the following: Cinolib is building https://github.com/cinolib-dev-team/Indirect_Predicates as a static library, but that trips up the linking with an eventual linking error:
[81/86] Linking CXX shared library src/libirmb.so
FAILED: src/libirmb.so
: && /usr/bin/c++ -fPIC -O2 -g -DNDEBUG -shared -Wl,-soname,libirmb.so -o src/libirmb.so src/CMakeFiles/irmb.dir/booleans.cpp.o src/CMakeFiles/irmb.dir/foctree.cpp.o src/CMakeFiles/irmb.dir/arrangements/io_functions.cpp.o gnu_11.3_cxx17_64_relwithdebinfo/libtbb.a /usr/lib/x86_64-linux-gnu/libGL.so imgui/libimgui.a imgui/glfw/src/libglfw3.a /usr/lib/x86_64-linux-gnu/librt.a -lm /usr/lib/x86_64-linux-gnu/libX11.so shewchuk_predicates/libshewchuk_predicates.a _deps/indirect_predicates-build/libindirectPredicates.a -ldl && :
/usr/bin/ld: _deps/indirect_predicates-build/libindirectPredicates.a(hand_optimized_predicates.cpp.o): warning: relocation against `_ZN15interval_number4zeroE' in read-only section `.text'
/usr/bin/ld: _deps/indirect_predicates-build/libindirectPredicates.a(implicit_point.cpp.o): relocation R_X86_64_PC32 against symbol `_ZN15interval_number4zeroE' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: bad value
This can be fixed by adding set_property(TARGET ${PROJECT_NAME} PROPERTY POSITION_INDEPENDENT_CODE ON) to https://github.com/cinolib-dev-team/Indirect_Predicates/blob/master/CMakeLists.txt but that's presumably not desirable except when trying to make this a shared library. I'm not familiar with the FetchContent_MakeAvailable mechanism being used to pull Indirect_Predicates - is there a way to pass the CMake configure process options from the top-level build?
Also, I notice Indirect_Predicates is using the LGPLv3 license - does Cinolib allow for shared linking with that library?