How to identify unnecessary include header files

[Rajeev Bansal via Gcc-help <gcc-help@xxxxxxxxxxx>]

Hello,

I am working on a large C/C++ project compiled with GCC and am looking for
ways to identify unnecessary header files. I'm wondering if there's a tool
similar to `include-what-you-use` (IWYU) that can help with this
information in gcc.

Any advice or recommendations would be greatly appreciated.

Thanks,
-Rajeev