Minor update to CMake configurations (#501)

* Introduced check for recursive clone of the repository 
* Added cmake error if libclang_rt file is not available with the selected compiler
  (required by rocblas benchmarks)

CMakeLists.txt

@@ -73,6 +73,10 @@ if (NOT INSTALL_HEADER_ONLY)
   include(ConfigurePORTBLAS)
   include(SYCL)
   find_package(PythonInterp 3 REQUIRED)
+  if(NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/external/py_gen/README.md" )
+    message(FATAL_ERROR "Repository not cloned recursively, missing submodule.\n"
+       "To continue please clone submodule using `git submodule update --init`")
+  endif()
 endif()
 
 if (MSVC)

benchmark/cublas/CMakeLists.txt

@@ -89,7 +89,7 @@ set(HALF_DATA_OPS "gemm"
 foreach(cublas_bench ${sources})
   get_filename_component(bench_cublas_exec ${cublas_bench} NAME_WE)
   add_executable(bench_cublas_${bench_cublas_exec} ${cublas_bench} main.cpp)
-  target_link_libraries(bench_cublas_${bench_cublas_exec} PRIVATE benchmark CUDA::toolkit CUDA::cublas CUDA::cudart portblas Clara::Clara bench_info)
+  target_link_libraries(bench_cublas_${bench_cublas_exec} PRIVATE benchmark CUDA::toolkit CUDA::cublas CUDA::cudart Clara::Clara bench_info)
   target_compile_definitions(bench_cublas_${bench_cublas_exec} PRIVATE -DBLAS_INDEX_T=${BLAS_BENCHMARK_INDEX_TYPE})
   if((${BLAS_ENABLE_COMPLEX}) AND ("${bench_cublas_exec}" IN_LIST CPLX_OPS))
     target_compile_definitions(bench_cublas_${bench_cublas_exec} PRIVATE BLAS_ENABLE_COMPLEX=1)

benchmark/rocblas/CMakeLists.txt

@@ -88,6 +88,23 @@ set(HALF_DATA_OPS "gemm"
                   "gemm_batched_strided"
 )
 
+# HIP_CXX_COMPILER is defined equal to CMAKE_CXX_COMPILER while looking for rocblas (line 30)
+# if it is passed by user it is supposed to be different from standard compiler, than it is up
+# to the user provide the correct path with the correct library.
+if("${HIP_CXX_COMPILER}" STREQUAL "${CMAKE_CXX_COMPILER}" )
+# Verify that libclang_rt.builtins exists for current compiler
+  if(EXISTS ${CLANGRT_BUILTINS} )
+    message("libclang_rt found at " ${CLANGRT_BUILTINS})
+  else()
+    message(FATAL_ERROR "libclang_rt not found at " ${CLANGRT_BUILTINS}
+      "\nCheck library availability for current CXX compiler. "
+      "Using HIP_CXX_COMPILER option, set another compiler compatible with ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION} that has libclang_rt.builtins for x86_64."
+      "If not possible skip rocBLAS benchmarks compilation")
+  endif()
+else()
+  message(WARNING "using CLANGRT_BUILTINS defined by user at " ${CLANGRT_BUILTINS})
+endif()
+
 # Add individual benchmarks for each method
 foreach(rocblas_benchmark ${sources})
   get_filename_component(rocblas_bench_exec ${rocblas_benchmark} NAME_WE)