When the target ABI is unspecified, find_package should include lib64
directories in hip-lang dependency search, regardless of whether hip-lang
is packaged under lib or lib64.
Fixes: #26194
ROCm may not install the `hip-lang` cmake package on NVIDIA platforms.
Skip verifying its presence. We do not use it for NVIDIA platforms anyway.
Fixes: #25271
These distros package the hip-lang package under `lib64`, so search it
too. This is similar to commit bae57dc281 (HIP: Fix search for hip-lang
CMake package on multiarch distros, 2023-05-31, v3.27.0-rc1~28^2).
Fixes: #25050
We need `CMAKE_LIBRARY_ARCHITECTURE` to find the package before HIP
compiler ABI detection. However, if HIP is the first enabled language,
the value is not known until `CMAKE_HIP_LIBRARY_ARCHITECTURE` is
determined by the ABI detection step. Resolve this by detecting
`CMAKE_HIP_LIBRARY_ARCHITECTURE` from the compiler id output.
Fixes: #24562
It only makes sense to use the CMake package from the same ROCm
installation that the compiler uses. Ask the HIP compiler to report the
location of the ROCm installation. Verify up front that it contains the
expected CMake package file.
Since commit bd844387df (ROCMClang: Add the ROCm toolkit derived clang
compiler to CMake, 2020-08-28, v3.21.0-rc1~66^2~6) and commit ff0d2858e1
(HIP: Extract clang compiler details from hipcc, 2020-10-21,
v3.21.0-rc1~66^2~5), the separate `ROCMClang` compiler id for `hipcc`
has caused a few problems:
* The compiler id changed from behavior of CMake 3.20 and below,
breaking projects that already built with `hipcc` treated as `Clang`.
* The implementation of `target_compile_features` was incomplete for
the `ROCMClang` identity.
* Only `hipcc` was identified as `ROCMClang`, so after it is unwrapped
to the underlying `clang++`, future runs of new CMake versions on
an existing build tree would not repeat this.
* Clang should be usable as a HIP compiler without the `hipcc` wrapper.
Remove the `ROMClang` compiler identity, and revise HIP language support
to work directly with a Clang compiler.
Reject direct `hipcc` usage as a HIP compiler. For now it cannot be
supported because it interferes with flags CMake needs to pass to Clang.
Fixes: #22536, #22460, #22593
Fail early if it is not found.
Use the detected location as a hint to find `rocm_agent_enumerator`.
Also remove the leading `_` prefix in case we want to document this
publicly later.
