CMAKE

cmake_minimum_required(VERSION 3.10) as the first line of CMakeLists.txt

Project(yourprojectname)


override the CFLAGS

set(CMAKE_USER_MAKE_RULES_OVERRIDE
   ${CMAKE_CURRENT_SOURCE_DIR}/c_flag_overrides.cmake)
set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX
   ${CMAKE_CURRENT_SOURCE_DIR}/cxx_flag_overrides.cmake)

a new file name c_flag_overrides.cmake, which has follow as example.
set(CMAKE_C_FLAGS "--no_unroll --no_inline --no_tbaa --no_scheduling --endian=little --cpu=Cortex-M3 --fpu=None")
set(CMAKE_DEPFILE_FLAGS_C "--dependencies=m <DEPFILE>")

set(CMAKE_C_FLAGS "--no_unroll --no_inline --no_tbaa --no_scheduling --endian=little --cpu=Cortex-M3 --fpu=None")set(CMAKE_DEPFILE_FLAGS_C "--dependencies=m <DEPFILE>")

CMAKE

原文：https://www.cnblogs.com/zjbfvfv/p/10641635.html