[RFC] Proposal to add HG (T-Head General-compute) as a first-class language

Development
1

Hi everyone,

I’d like to propose adding HG as a first-class language in CMake, similar to CUDA and HIP. Looking for feedback before submitting a formal MR.

I am from T-Head Semiconductor ( https://www.t-head.cn ), a subsidiary of Alibaba Group. We developed an AI chip (PPU, ELF EM_PPU=270) with a complete software stack including a dedicated compiler `hgcc`.

HG (T-Head General-compute) is the programming language for our PPU architecture:
- Independent compiler driver: `hgcc`
- Dedicated source file extension: `.hg` (single-source, host+device)
- Own annotation system, with CUDA syntax compatibility
- Architecture-specific flags: `-march=ppu_xxx`

We have already implemented CMake modules internally covering Makefile and Ninja generators on Linux, with compiler detection, compilation, linking, and architecture handling. Windows/VS support isn’t implemented yet. We are prepared to maintain the integration long-term if the community finds this acceptable, and are happy to adapt our implementation to CMake conventions.

Any feedback from maintainers would be greatly appreciated.

Thanks,
Jimmy.HJ
T-Head Semiconductor

2

Please open an issue on the CMake GitLab describing the feature and usecase. If there are no objections to the feature, you can link back to it in an MR introducing the code.