This GCC is problematic for using with clangd language server

[super-betonamu-jin]

This is my conclusion after spending days trying to figure out what’s going on. Based on the output of gcc -E -v, I found that the header paths are duplicated and redirected through multiple levels of relative paths. The output on other GCC versions is much clearer.

I previously thought clangd was buggy and that I needed to manually specify --sysroot and -isystem for CMake to include them in compile_commands.json, since it doesn’t do so by default. However, the output of gcc -E -v puzzled me. Later I discovered that Premake5 does include -isystem in the compile_commands.json it generates. I quickly wrote a premake5.lua and tested it. Even when I made everything as conformant as possible, clangd still complained that the path in compile_commands.json was invalid, which validated my earlier speculation.