flycheck can't find header file even though flycheck-clang-include-path configured

Question

I am using Doom Emacs as my editor for C. I'm trying to use glib in my C project and for that I'm including glib.h. I have added the include dirs displayed by pkg-config --cflags glib-2.0 to flycheck-clang-include-path, like so:

(add-hook! c-mode
  (setq flycheck-clang-include-path
        (list "/usr/include/glib-2.0"
              "/usr/lib/glib-2.0/include"
              "/usr/include/sysprof-4")))

It displays these paths in customize as well. However I still get the error "'glib.h' file not found" when I do #include <glib.h>. What am I doing wrong, how do I get flycheck to find the header?

Answer 1

So, this wasn't flycheck's fault, I simply hadn't configured the LSP for this project. I did so now by generating a compile_commands.json file using bear. Everything works as expected now.