File too big with MinGW-w64 and CMake

Question

I'm trying to compile a project with MinGW-w64 and I get a file too big error while creating the object code.

I already tried, in vain, to add some compile options to my CMakeLists.txt file as follows:

if(WIN32)
    target_compile_options(${target_name} PUBLIC -Wa,-mbig-obj)
endif()

I also tried to append -O2 to such options, but I should really avoid it for my debug and release configurations.

I installed MinGW-w64 and CMake from the MSYS2 package. They're both up to date. MinGW-w64 should have Large File Support, so I'm not sure about the source of the problem. Is MinGW-w64 actually a 32 bit compiler targeting 64 and 32 bit systems? If it was the case, shouldn't LFS prevent file too big errors?

Thanks in advance.