41 lines
1.7 KiB
CMake
41 lines
1.7 KiB
CMake
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#[=======================================================================[.rst:
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emsdkHack
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---------
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The Emscripten platform doesn't support the use of shared libraries as known by cmake.
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* https://github.com/emscripten-core/emscripten/issues/15276
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* https://github.com/emscripten-core/emscripten/issues/17804
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This workaround only works due to the way the cmake scripts are loaded.
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Prior to the use of ``project( ... )`` directive we need to set
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``CMAKE_PROJECT_INCLUDE=cmake/emscripten.cmake``.
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This file will be loaded after the toolchain overriding the settings that
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prevent shared library building.
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CMAKE_PROJECT_INCLUDE was Added in version 3.15.
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``CMAKE_PROJECT_<projectName>_INCLUDE`` was Added in version 3.17:
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More information on cmake's `code injection`_
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.. _code injection:https://cmake.org/cmake/help/latest/command/project.html#code-injection
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Overwrite Shared Library Properties to allow shared libs to be generated.
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]=======================================================================]
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if( EMSCRIPTEN )
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set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
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set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-sSIDE_MODULE=1")
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set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-sSIDE_MODULE=1")
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set(CMAKE_SHARED_LIBRARY_SUFFIX) # remove the suffix from the shared lib
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set(CMAKE_STRIP FALSE) # used by default in pybind11 on .so modules
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# The Emscripten toolchain sets the default value for EMSCRIPTEN_SYSTEM_PROCESSOR to x86
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# and CMAKE_SYSTEM_PROCESSOR to this value. I don't want that.
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set(CMAKE_SYSTEM_PROCESSOR "wasm32" )
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# the above prevents the need for logic like:
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#if( ${CMAKE_SYSTEM_NAME} STREQUAL Emscripten )
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# set( SYSTEM_ARCH wasm32 )
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#endif ()
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endif ()
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