Add CMake HIP language support (#188)

Add USE_HIPCXX option to build using CMake's support for the
HIP language. This option requires CMake 3.21.3 or newer.

CMakeLists.txt

@@ -59,6 +59,9 @@ project(rocalution LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_HIP_STANDARD 14)
+set(CMAKE_HIP_STANDARD_REQUIRED ON)
+set(CMAKE_HIP_EXTENSIONS OFF)
 
 # Build options
 option(BUILD_SHARED_LIBS "Build rocALUTION as a shared library" ON)
@@ -91,17 +94,24 @@ set(DEFAULT_AMDGPU_TARGETS
 )
 set(AMDGPU_TARGETS "${DEFAULT_AMDGPU_TARGETS}" CACHE STRING "List of specific machine types for library to target")
 
-# Find HIP package
-find_package(HIP)
-
-if (NOT HIP_FOUND)
-  message("-- HIP not found. Compiling WITHOUT HIP support.")
+include(CheckLanguage)
+include(CMakeDependentOption)
+check_language(HIP)
+cmake_dependent_option(USE_HIPCXX "Use CMake HIP language support" ON CMAKE_HIP_COMPILER OFF)
+if(USE_HIPCXX)
+  enable_language(HIP)
 else()
-  option(SUPPORT_HIP "Compile WITH HIP support." ON)
+  find_package(HIP MODULE) # hip_add_library is only provided by the find module
+  if(NOT HIP_FOUND)
+    message("-- HIP not found. Compiling WITHOUT HIP support.")
+  endif()
 endif()
 
+cmake_dependent_option(SUPPORT_HIP "Compile WITH HIP support" ON "USE_HIPCXX OR HIP_FOUND" OFF)
+
 # HIP related library dependencies
 if(SUPPORT_HIP)
+  find_package(hip REQUIRED)
   find_package(rocblas REQUIRED)
   find_package(rocsparse REQUIRED)
   find_package(rocprim REQUIRED)

src/CMakeLists.txt

@@ -145,27 +145,37 @@ target_compile_options(rocalution PRIVATE ${CMAKE_HOST_FLAGS})
 # Create rocALUTION hip library
 if(SUPPORT_HIP)
   # Flag source file as a hip source file
-  foreach(i ${HIP_SOURCES})
-    set_source_files_properties(${i} PROPERTIES HIP_SOURCE_PROPERTY_FORMAT TRUE)
-  endforeach()
-
-  # HIP flags workaround while target_compile_options do not work
-
-  # If CPU optimizations for local machine is actived
-  if(BUILD_OPTCPU)
-    list(APPEND HIP_HIPCC_FLAGS "-march=native")
+  if(USE_HIPCXX)
+    set_source_files_properties(${HIP_SOURCES} PROPERTIES LANGUAGE HIP)
+  else()
+    set_source_files_properties(${HIP_SOURCES} PROPERTIES HIP_SOURCE_PROPERTY_FORMAT TRUE)
   endif()
 
-  list(APPEND HIP_HIPCC_FLAGS "-O3 -fPIC -std=c++14")
-  foreach(target ${AMDGPU_TARGETS})
-    list(APPEND HIP_HIPCC_FLAGS "--offload-arch=${target}")
-  endforeach()
-
-  # Create rocALUTION HIP library
-  if(WIN32)
-    add_library(rocalution_hip OBJECT ${HIP_SOURCES})
+  if(USE_HIPCXX)
+    add_library(rocalution_hip ${HIP_SOURCES})
+    # If CPU optimizations for local machine is actived
+    if(BUILD_OPTCPU)
+      target_compile_options(rocalution_hip PRIVATE "-march=native")
+    endif()
   else()
-    hip_add_library(rocalution_hip ${HIP_SOURCES})
+    # HIP flags workaround while target_compile_options do not work
+
+    # If CPU optimizations for local machine is actived
+    if(BUILD_OPTCPU)
+      list(APPEND HIP_HIPCC_FLAGS "-march=native")
+    endif()
+
+    list(APPEND HIP_HIPCC_FLAGS "-O3 -fPIC -std=c++14")
+    foreach(target ${AMDGPU_TARGETS})
+      list(APPEND HIP_HIPCC_FLAGS "--offload-arch=${target}")
+    endforeach()
+
+    # Create rocALUTION HIP library
+    if(WIN32)
+      add_library(rocalution_hip OBJECT ${HIP_SOURCES})
+    else()
+      hip_add_library(rocalution_hip ${HIP_SOURCES})
+    endif()
   endif()
 
   if(SUPPORT_MPI)