We use PYTORCH_ROCM_ARCH env variable as the target list first, if it…

…'s not set, then we default to rocm_agent_enumerator for the target list

cmake/utils.cmake

@@ -139,16 +139,23 @@ macro(override_gpu_arches GPU_ARCHES GPU_LANG GPU_SUPPORTED_ARCHES)
   if (${GPU_LANG} STREQUAL "HIP")
     #
     # `GPU_ARCHES` controls the `--offload-arch` flags.
-    # `CMAKE_HIP_ARCHITECTURES` is set up by torch and can be controlled
-    # via the `PYTORCH_ROCM_ARCH` env variable.
     #
-
+    # If PYTORCH_ROCM_ARCH env variable exsists, then we take it as a list,
+    # if not, then we use CMAKE_HIP_ARCHITECTURES which was generated by calling
+    # "rocm_agent_enumerator" in "enable_language(HIP)"
+    # (in file Modules/CMakeDetermineHIPCompiler.cmake)
+    #
+    if(DEFINED ENV{PYTORCH_ROCM_ARCH})
+      set(HIP_ARCHITECTURES $ENV{PYTORCH_ROCM_ARCH})
+    else()
+      set(HIP_ARCHITECTURES ${CMAKE_HIP_ARCHITECTURES})
+    endif()
     #
     # Find the intersection of the supported + detected architectures to
     # set the module architecture flags.
     #
     set(${GPU_ARCHES})
-    foreach (_ARCH ${CMAKE_HIP_ARCHITECTURES})
+    foreach (_ARCH ${HIP_ARCHITECTURES})
       if (_ARCH IN_LIST _GPU_SUPPORTED_ARCHES_LIST)
         list(APPEND ${GPU_ARCHES} ${_ARCH})
       endif()