add user-friendly compiler checks to the CMakelists.txt

Author: haichangsi

CMakeLists.txt

@@ -8,9 +8,25 @@ set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 project(
   distributed_ranges_tutorial
+  LANGUAGES CXX
   VERSION 0.1
   DESCRIPTION "Distributed ranges tutorial")
 
+if(NOT DEFINED ENV{CXX})
+  message(FATAL_ERROR "CXX environment variable is not defined")
+endif()
+
+if(NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "IntelLLVM")
+  message(FATAL_ERROR "ICPX compiler is required. Please set CXX to icpx.")
+endif()
+
+include(CheckCXXCompilerFlag)
+check_cxx_compiler_flag(-fsycl COMPILER_SUPPORTS_FSYCL)
+
+if(NOT COMPILER_SUPPORTS_FSYCL)
+  message(FATAL_ERROR "A compiler with SYCL support is required.")
+endif()
+
 find_package(MPI REQUIRED)
 
 add_subdirectory(src)