Index: cmake/caches/O1.cmake
===================================================================
--- /dev/null
+++ cmake/caches/O1.cmake
@@ -0,0 +1,5 @@
+set(OPTFLAGS "${OPTFLAGS} -O1")
+
+set(CMAKE_C_FLAGS_RELEASE "${OPTFLAGS}" CACHE STRING "")
+set(CMAKE_CXX_FLAGS_RELEASE "${OPTFLAGS}" CACHE STRING "")
+set(CMAKE_BUILD_TYPE "Release" CACHE STRING "")
Index: cmake/caches/O2.cmake
===================================================================
--- /dev/null
+++ cmake/caches/O2.cmake
@@ -0,0 +1,5 @@
+set(OPTFLAGS "${OPTFLAGS} -O2")
+
+set(CMAKE_C_FLAGS_RELEASE "${OPTFLAGS}" CACHE STRING "")
+set(CMAKE_CXX_FLAGS_RELEASE "${OPTFLAGS}" CACHE STRING "")
+set(CMAKE_BUILD_TYPE "Release" CACHE STRING "")