Linker error undefined symbol: glMultMatrixd when using GLU with gl4es on Emscripten

[arti-max]

Hello,

I'm encountering a linking issue when trying to use GLU with gl4es in an Emscripten project. I've been following the advice from previously created issues (like #352), but I'm still hitting a wall.

When I add a call to gluPerspective, I get the following linker error:

wasm-ld: error: D:/!jsproj/CrossCraftWebPP/lib/libGLU.a(project.o): undefined symbol: glMultMatrixd

Here is what I've done so far:

Successfully compiled gl4es with -DEXPORT_LIB=1 to make GL symbols visible.

Created a CMakeLists.txt for the ptitSeb/GLU repository and compiled libGLU.a for Emscripten, resolving issues with register keyword and LONG_MAX along the way.

Disabled name mangling for GLU by commenting out #include "glu_mangle.h" in the gl4es version of glu.h.

Despite all this, the glMultMatrixd symbol required by GLU cannot be found in gl4es during the final link stage.

Here is my project's CMakeLists.txt:

cmake_minimum_required(VERSION 3.16)
project(CrossCraftWebPP)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)

set(SOURCES
    src/main.cpp
    src/render/Tessellator.cpp
)

add_executable(CrossCraftWebPP ${SOURCES})

if(EMSCRIPTEN)
    target_link_libraries(CrossCraftWebPP PRIVATE 
        glfw
        -Wl,--start-group
        "${CMAKE_CURRENT_SOURCE_DIR}/lib/libGLU.a"
        "${CMAKE_CURRENT_SOURCE_DIR}/lib/libGL.a"
        -Wl,--end-group
    )

    set_target_properties(CrossCraftWebPP PROPERTIES 
        LINK_FLAGS "\
            -s WASM=1 \
            -s USE_GLFW=3 \
            -s FULL_ES2=1 \
            -s ALLOW_MEMORY_GROWTH=1 \
        "
    )
    
    set_target_properties(CrossCraftWebPP PROPERTIES SHELL_FILE "${CMAKE_SOURCE_DIR}/index.html")
    set_target_properties(CrossCraftWebPP PROPERTIES OUTPUT_NAME "game")
    set_target_properties(CrossCraftWebPP PROPERTIES SUFFIX ".html")
endif()

Am I missing a crucial step, or is there a fundamental incompatibility here?

Any help or insight would be greatly appreciated. Thank you.