not to override CMAKE_BUILD_TYPE

Author: shijiashuai

CMakeLists.txt

@@ -9,7 +9,9 @@ else ()
 endif ()
 set(USE_CUDA ON CACHE BOOL "Compile with CUDA")
 set(USE_EIGEN OFF CACHE BOOL "Compile with Eigen")
-set(CMAKE_BUILD_TYPE Release)
+if (NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Release)
+endif ()
 find_package(Threads REQUIRED)
 find_package(OpenMP REQUIRED)
 if (OPENMP_FOUND)