ShaderLang.h GLSLANG_EXPORT is not working properly

[SamCZ]

Hi, I tried to link glslang as shared library, but I'm having issue with whole ShaderLang.h file.

This is my setup

if(NOT TARGET glslang)
    set(SKIP_GLSLANG_INSTALL ON)
    set(ENABLE_HLSL OFF)
    set(BUILD_EXTERNAL OFF)
    set(BUILD_SHARED_LIBS ON)
    add_subdirectory(glslang)
endif()

I link glslang to my dynamic linked engine that is in used in my game.

I use MingW with 10.2.0 GCC and cmake build system.

Weird thing is that I can see the preprocessor definition GLSLANG_IS_SHARED_LIBRARY set in glslang_c_interface.h correctly, but when I look in ShaderLang.h its not set. I tried to look at ninja build file and its set there.

I tried reloading cmake, deleting whole build folder, disabling PCH and nothing worked.

This is error that is shown building my engine

C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: lib/Aurora/CMakeFiles/Aurora.dir/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp.obj: in function `Aurora::GLRenderDevice::~GLRenderDevice()':
E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:177: undefined reference to `__imp__ZN7glslang15FinalizeProcessEv'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: lib/Aurora/CMakeFiles/Aurora.dir/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp.obj: in function `Aurora::GLRenderDevice::CreateShaderProgram(Aurora::ShaderProgramDesc const&)':
E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:512: undefined reference to `__imp__ZN7glslang7TShaderC1E11EShLanguage'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:517: undefined reference to `__imp__ZN7glslang7TShader13setEntryPointEPKc'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:525: undefined reference to `__imp__ZN7glslang7TShader29setStringsWithLengthsAndNamesEPKPKcPKiS4_i'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:526: undefined reference to `__imp__ZN7glslang7TShader18setAutoMapBindingsEb'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:530: undefined reference to `__imp__ZN7glslang7TShader10preprocessEPK16TBuiltInResourcei8EProfilebb11EShMessagesPNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERNS0_8IncluderE'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:532: undefined reference to `__imp__ZN7glslang7TShader15getInfoDebugLogEv'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:532: undefined reference to `__imp__ZN7glslang7TShader10getInfoLogEv'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: lib/Aurora/CMakeFiles/Aurora.dir/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp.obj: in function `Aurora::GLRenderDevice::Init()':
E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:184: undefined reference to `__imp__ZN7glslang17InitializeProcessEv'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: E:/Sam2/Sam/Projects/EmberSky/lib/Aurora/src/Aurora/Graphics/OpenGL/GLRenderDevice.cpp:243: undefined reference to `__imp__ZN7glslang20GetGlslVersionStringEv'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

[greg-lunarg]

At the moment glslang is not supporting a shared build and not creating any shared objects. This is a known problem. See #2283 #2346 #2196.

I would recommend statically linking until this is fixed.

[SamCZ]

ok thanks for the info and sorry for the duplicate