解决方法：

在cmakelists.txt中添加设置：

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fms-extensions")

问题解决

下面是cmakelists.txt中的常见设置。

set(CPU_OPTIONS "${CPU_OPTIONS} -mthumb -mcpu=cortex-m0")

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CPU_OPTIONS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11")

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CPU_OPTIONS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fms-extensions")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-use-cxa-atexit")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-threadsafe-statics")

set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -T ${LINKER_SCRIPT}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -nostartfiles")
# set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -nostdlib")

# optimizations (-O0 -O1 -O2 -O3 -Os -Ofast -Og -flto)
set(OPTIMIZATION_DEBUG "-Og")
set(OPTIMIZATION_RELEASE "-O2 -flto")

set(CMAKE_C_FLAGS_DEBUG "${OPTIMIZATION_DEBUG} -g -DDEBUG")
set(CMAKE_CXX_FLAGS_DEBUG "${OPTIMIZATION_DEBUG} -g -DDEBUG")
set(CMAKE_C_FLAGS_RELEASE "${OPTIMIZATION_RELEASE}")
set(CMAKE_CXX_FLAGS_RELEASE "${OPTIMIZATION_RELEASE}")