[bsyrowik]

Motivation

The ROCm 10.2 rocWMMA package requires OpenMP during package discovery. If OpenMP is unavailable, the examples select a header-only fallback that omits HIP’s host runtime dependencies. On Windows, this can leave __truncsfhf2 and __extendhfsf2 unresolved because compiler-rt builtins are missing from the link command.

Related: ROCM-33266

Technical Details

Link the fallback target to hip::host so HIP supplies the required dependencies. Apply this in both the parent rocWMMA project and each sample to cover aggregate and standalone builds.

Test Plan

Test Result

Validation:

• Windows, TheRock 10.2.0a20261015, Clang 24, Ninja, Release, gfx1103.
• Reproduced the original simple_hgemm link failure with CMAKE_DISABLE_FIND_PACKAGE_OpenMP=ON.
• With the fix and OpenMP still disabled, confirmed that clang_rt.builtins-x86_64.lib appears explicitly on the link command and the build succeeds.
• Linux: built all 11 samples through the parent project with normal package discovery and forced header fallback.

Added/Updated documentation?

• Yes
• No, does not apply to this PR.

Included Visual Studio files?

• Yes
• No, does not apply to this PR.

Submission Checklist

• New examples contain proper CMake and Make files.
• I have updated relevant CI workflows and the new examples are being built and tested in CI.
• Check and guard against unsupported ASICs if relevant dependent libraries have limited support.
• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[zichguan-amd]

LGTM, please fill in the description before merging