#release模式下,设置c、c++编译参数 优化选项为-Os
SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}  -Os -Wall -s")
SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}  -Os -Wall -s")

#release模式下,设置c、c++编译参数: 去除没有使用到的函数,数据,注释,减少体积大小, 配合 -Wl,--gc-sections 使用
SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -ffunction-sections -fdata-sections")
SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -ffunction-sections -fdata-sections")
##可执行程序链接的时候,去除没有使用到的函数,数据,注释, 配合-ffunction-sections -fdata-sections 使用
SET(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -Wl,--gc-sections")
SET(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,--gc-sections")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--gc-sections")

#release模式下,启用堆栈保护，为所有函数插入保护代码
SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -fstack-protector-all -fstack-protector-strong")
SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fstack-protector-all -fstack-protector-strong")
#release模式下,地址无关, 随机化
SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -fPIC -fPIE -pie")
SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fPIC -fPIE -pie")
#堆栈不可执行保护, 该保护作用于链接阶段
SET(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -Wl,-z,noexecstack")
SET(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,noexecstack")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,noexecstack")
#GOT表保护、-z,now全部保护
SET(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -Wl,-z,relro")
SET(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,relro")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,relro")
SET(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -Wl,-z,now")
SET(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,now")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,now")
#关闭动态库搜索路径
SET(CMAKE_SKIP_RPATH TRUE)
SET(CMAKE_SKIP_BUILD_RPATH TRUE)