Only build oclgl tests if OpenGL is installed on the system

Change-Id: I226f2e09c98a970ce8dce0b6f670ca13d868aeb6

opencl/tests/ocltst/module/common/CMakeLists.txt

@@ -1,7 +1,5 @@
-add_library(Common OBJECT
+set(COMMON_SOURCES
     ${OCLTST_DIR}/module/common/BaseTestImp.cpp
-    ${OCLTST_DIR}/module/common/OCLGLCommon.cpp
-    ${OCLTST_DIR}/module/common/OCLGLCommonLinux.cpp
     ${OCLTST_DIR}/module/common/OCLTestImp.cpp
     ${OCLTST_DIR}/module/common/OCLTestListImp.cpp
     ${OCLTST_DIR}/module/common/OCLTestUtils.cpp
@@ -9,6 +7,15 @@ add_library(Common OBJECT
     ${OCLTST_DIR}/module/common/OCLWrapper.cpp
     ${OCLTST_DIR}/module/common/Timer.cpp)
 
+if(OPENGL_FOUND AND GLEW_FOUND)
+    set(COMMON_SOURCES
+        ${COMMON_SOURCES}
+        ${OCLTST_DIR}/module/common/OCLGLCommon.cpp
+        ${OCLTST_DIR}/module/common/OCLGLCommonLinux.cpp)
+endif()
+
+add_library(Common OBJECT ${COMMON_SOURCES})
+
 set_target_properties(Common PROPERTIES
     CXX_STANDARD 14
     CXX_STANDARD_REQUIRED ON
@@ -20,12 +27,23 @@ target_compile_definitions(Common
         ATI_OS_LINUX
         CL_TARGET_OPENCL_VERSION=220)
 
+if(OPENGL_FOUND AND GLEW_FOUND)
+    target_compile_definitions(Common
+        PUBLIC
+            USE_OPENGL=1)
+endif()
+
 target_include_directories(Common
     PUBLIC
         ${OPENCL_ICD_LOADER_HEADERS_DIR}
-        ${OPENGL_INCLUDE_DIR}
-        ${GLEW_INCLUDE_DIRS}
         ${OCLTST_DIR}/include
         ${OCLTST_DIR}/module/common
         ${OCLTST_DIR}/module/include
         ${PROJECT_SOURCE_DIR}/amdocl) #TODO remove cl_profile_amd.h dependency
+
+if(OPENGL_FOUND AND GLEW_FOUND)
+    target_include_directories(Common
+        PUBLIC
+            ${OPENGL_INCLUDE_DIR}
+            ${GLEW_INCLUDE_DIRS})
+endif()