include header file fail

[JoJoBizarreAdventure]

I import assimp v5.3.1 as a submodule. Then use similar cmake as below:

add_subdirectory(assimp)
function(link_assimp target_name)
    target_link_libraries(${target_name} PRIVATE assimp)
endfunction()

When I use link_assimp later, something wrong happend.

As the image showed, header file including work normally in source file but fail in the header.

I have tried to use forward declaration to avoid this, but it's hard to deal with enum type like aiTextureType.

I test all these things under win11 with visual studio toolchain in Clion.

I wonder if there is some smart tricks for fixing. Please give me some advice.

[JoJoBizarreAdventure]

The situation is just similar to this one - #4827

But the include directory should be already linked with target_link_libraries. So confusing...

[JoJoBizarreAdventure]

Oh! I got an answer. Update the previous code like this will work:

add_library(assimp_header INTERFACE)
target_include_directories(assimp_header
        INTERFACE
        ${CMAKE_CURRENT_SOURCE_DIR}/assimp/include)
target_include_directories(assimp_header
        INTERFACE
        ${CMAKE_CURRENT_BINARY_DIR}/assimp/include)
function(link_assimp target_name)
    target_link_libraries(${target_name} PRIVATE assimp)
    target_link_libraries(${target_name} INTERFACE assimp_header)
endfunction()

Adding INTERFACE library will help with including. I check few repo for this ( like eigen,), all of these having similar design.

I wonder maybe assimp need one either.