Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -132,7 +132,7 @@ if(NOT DISABLE_RPATH)
 endif()
 
 # set general build flags for debug build-type
-set(CMAKE_C_FLAGS_DEBUG "-O0 -ggdb3 -DDEBUG -fno-common -Wall -Wno-pointer-sign -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Wextra -Wredundant-decls" CACHE STRING "" FORCE)
+set(CMAKE_C_FLAGS_DEBUG "-ggdb3 -DDEBUG -fno-common -Wall -Wno-pointer-sign -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Wextra -Wredundant-decls" CACHE STRING "" FORCE)
 ## append ASAN build flags if compiler version has support
 #if("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
 #   if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.8)
@@ -153,7 +153,7 @@ set(CMAKE_C_FLAGS_DEBUG "-O0 -ggdb3 -DDEBUG -fno-commo
 #endif()
 
 # set build flags for release build-type
-set(CMAKE_C_FLAGS_RELEASE "-O2 -w -D_FORTIFY_SOURCE=2" CACHE STRING "" FORCE)
+set(CMAKE_C_FLAGS_RELEASE "-w -D_FORTIFY_SOURCE=2" CACHE STRING "" FORCE)
 
 if(OS_DARWIN)
 set(CMAKE_EXE_LINKER_FLAGS "-Wl" CACHE STRING "" FORCE)