Add external libs for comparisons and benchmarks.

extern/CMP_Core/CMakeLists.txt

@@ -0,0 +1,33 @@
+cmake_minimum_required(VERSION 3.10)
+
+add_library(CMP_Core STATIC "")
+
+target_sources(CMP_Core
+               PRIVATE
+                   shaders/BC1_Encode_kernel.h
+                   shaders/BC1_Encode_kernel.cpp
+                   shaders/BC2_Encode_kernel.h
+                   shaders/BC2_Encode_kernel.cpp
+                   shaders/BC3_Encode_kernel.h
+                   shaders/BC3_Encode_kernel.cpp
+                   shaders/BC4_Encode_kernel.h
+                   shaders/BC4_Encode_kernel.cpp
+                   shaders/BC5_Encode_kernel.h
+                   shaders/BC5_Encode_kernel.cpp
+                   shaders/BC6_Encode_kernel.h
+                   shaders/BC6_Encode_kernel.cpp
+                   shaders/BC7_Encode_Kernel.h
+                   shaders/BC7_Encode_Kernel.cpp
+                   shaders/BCn_Common_Kernel.h
+                   shaders/Common_Def.h
+                   )
+
+target_include_directories(CMP_Core
+                           PRIVATE
+                           shaders
+                           source)
+#add_subdirectory(test)
+
+if (UNIX)
+target_compile_definitions(CMP_Core PRIVATE _LINUX ASPM_GPU)
+endif()