Feature Request: Add a environment variable AMD_HIP_ADDITIONAL_PATH to add a include directory in ggml-hip to handle unofficial supported hip components.

[zhang-hui-yulo]

Prerequisites

• I am running the latest code. Mention the version if possible as well.
• I carefully followed the README.md.
• I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• I reviewed the Discussions, and have a new and useful enhancement to share.

Feature Description

Add a environment variable AMD_HIP_ADDITIONAL_PATH to add a include directory in ggml-hip to handle unofficial supported hip components.

Motivation

HIP windows lacks a lot of useful components, to support Flash Attention wmma, rocWMMA is must.

HIP windows doesn't have rocWMMA, as rocWMMA is a head only library, using it is low risk, I don't want to put it into the HIP installed folder, add a customized path for it is more beautiful.

If you're allowed, I can create a PR.

Possible Implementation

No response

[IMbackK]

You can already achive this with CMAKE_HIP_FLAGS/CMAKE_CXX_FLAGS so i dont think anything needs to change here.