[Issue]: Buillds fails with -DMIGRAPHX_USE_HIPBLASLT=Off

Problem Description

Summary

src/targets/gpu/lowering.cpp calls gpu::gfx_default_rocblas() unconditionally, but its declaration in src/targets/gpu/include/migraphx/gpu/device_name.hpp is guarded behind #if MIGRAPHX_USE_HIPBLASLT. Any build configured with -DMIGRAPHX_USE_HIPBLASLT=Off fails to compile.

This affects any GPU target with no hipBLASLt kernels at all (e.g. gfx900/gfx906 - Vega10/Vega20), where MIGRAPHX_USE_HIPBLASLT=Off is the only correct build configuration, not an edge case.

Error

/migraphx-src/src/targets/gpu/lowering.cpp:280:51: error: no member named 'gfx_default_rocblas' in namespace 'migraphx::gpu'
  280 |                 not hipblaslt_supported() or gpu::gfx_default_rocblas()))
      |                                                   ^~~~~~~~~~~~~~~~~~~
1 error generated.

Root cause

src/targets/gpu/include/migraphx/gpu/device_name.hpp:

#if MIGRAPHX_USE_HIPBLASLT
MIGRAPHX_GPU_EXPORT bool gfx_default_rocblas();
MIGRAPHX_GPU_EXPORT bool gfx_default_rocblas(const context& ctx);
#endif

MIGRAPHX_GPU_EXPORT bool hipblaslt_supported();
MIGRAPHX_GPU_EXPORT bool hipblaslt_supported(const context& ctx);

src/targets/gpu/lowering.cpp (no matching guard around the call):

if(not has_fp8_inputs and
   ((string_value_of(MIGRAPHX_SET_GEMM_PROVIDER{}) == "rocblas") or
    not hipblaslt_supported() or gpu::gfx_default_rocblas()))

hipblaslt_supported() is itself declared/defined unconditionally and correctly returns a hardcoded false when the flag is off (device_name.cpp):

bool hipblaslt_supported()
{
#if !MIGRAPHX_USE_HIPBLASLT
    return false;
#else
    return hipblaslt_supported_impl(get_gfx_name(get_device_name()));
#endif
}

So the asymmetry is specifically in gfx_default_rocblas()'s declaration being conditionally compiled out while its only real caller (lowering.cpp) is not.

Reproduction

git clone --depth 1 https://github.com/ROCm/AMDMIGraphX.git
cd AMDMIGraphX
cmake -B build -G Ninja -DGPU_TARGETS=gfx900 -DMIGRAPHX_USE_HIPBLASLT=Off -DMIGRAPHX_USE_COMPOSABLEKERNEL=Off -DCMAKE_INSTALL_PREFIX=/opt/rocm
cmake --build build --target install

Fails identically on develop (current HEAD as of this report) and on release/rocm-rel-7.14.
You can see my failed CI run here: https://github.com/Schaka/rocm-migraphx-ort-builder/actions/runs/30455557112/job/90588160497

Suggested fix

Since not hipblaslt_supported() already evaluates unconditionally to true whenever MIGRAPHX_USE_HIPBLASLT is off, the whole or chain is already true regardless of gfx_default_rocblas()'s value in that configuration - dropping the redundant call when the flag is off is a semantics-preserving fix, not a behavior change:

- not hipblaslt_supported() or gpu::gfx_default_rocblas()))
+ not hipblaslt_supported()
+ #if MIGRAPHX_USE_HIPBLASLT
+     or gpu::gfx_default_rocblas()
+ #endif
+ ))

(or equivalently, wrap the declaration usage with the same #if MIGRAPHX_USE_HIPBLASLT guard used in the header, providing a false fallback for the dropped disjunct - either form compiles and preserves current behavior.)

Environment

• Base: rocm/dev-ubuntu-26.04:7.14.0-full
• Target: -DGPU_TARGETS=gfx900 (also reproduces on gfx906)
• Compiler: /opt/rocm/llvm/bin/clang++ (ROCm 7.14.0 bundled clang)

Operating System

Ubuntu 26.04 (Docker)

CPU

Ultra 7 270k locally and whatever GitHub uses in CI

GPU

Other

Other

Irrelevant, happens at compile time

ROCm Version

ROCm 7.14

Steps to Reproduce

No response

(Optional for Linux users) Output of /opt/rocm/bin/rocminfo --support

No response

Additional Information

No response

Start with src/targets/gpu/lowering.cpp and compare its gfx_default_rocblas() call with the guard in src/targets/gpu/include/migraphx/gpu/device_name.hpp and the fallback in device_name.cpp. Reproduce with the provided CMake command using MIGRAPHX_USE_HIPBLASLT=Off and GPU_TARGETS=gfx900; done means the build completes without the missing-member error while preserving the enabled configuration.