Move OpenCL detection to the root of the project. (#196)

Author: ghisvail

src/CMakeLists.txt

@@ -163,6 +163,15 @@ message( STATUS "CMAKE_CXX_COMPILER release flags: " ${CMAKE_CXX_FLAGS_RELEASE}
 message( STATUS "CMAKE_CXX_COMPILER relwithdebinfo flags: " ${CMAKE_CXX_FLAGS_RELWITHDEBINFO} )
 message( STATUS "CMAKE_EXE_LINKER link flags: " ${CMAKE_EXE_LINKER_FLAGS} )
 
+# Query the user for which version of OpenCL they wish to build the library for
+set( BUILD_CLVERSION "1.2" CACHE STRING "The version of OpenCL we wish to compile the library against" )
+set_property( CACHE BUILD_CLVERSION PROPERTY STRINGS 2.0 1.2 1.1 )
+message( STATUS "clSPARSE is building using CL interface ='${BUILD_CLVERSION}'" )
+
+# clSPARSE library requires OpenCL
+# A standard FindOpenCL.cmake module ships with cmake 3.1, but we supply our own until 3.1 becomes more $
+find_package( OpenCL ${BUILD_CLVERSION} REQUIRED )
+
 # configure a header file to pass the CMake version settings to the source, and package the header files in the output archive
 message( STATUS "PROJECT SRC DIR = ${PROJECT_SOURCE_DIR}")
 configure_file( "${PROJECT_SOURCE_DIR}/include/clSPARSE-version.h.in" "${PROJECT_BINARY_DIR}/include/clSPARSE-version.h" )

src/library/CMakeLists.txt

@@ -17,15 +17,6 @@
 
 include( GenerateExportHeader )
 
-# Query the user for which version of OpenCL they wish to build the library for
-set( BUILD_CLVERSION "1.2" CACHE STRING "The version of OpenCL we wish to compile the library against" )
-set_property( CACHE BUILD_CLVERSION PROPERTY STRINGS 2.0 1.2 1.1 )
-message( STATUS "clSPARSE is building using CL interface ='${BUILD_CLVERSION}'" )
-
-# clSPARSE library requires OpenCL
-# A standard FindOpenCL.cmake module ships with cmake 3.1, but we supply our own until 3.1 becomes more prevalent
-find_package( OpenCL ${BUILD_CLVERSION} REQUIRED )
-
 # clSPARSE library requires clBLAS
 # find_package( clBLAS REQUIRED )