如何覆盖/删除CMake的C编译器标志

Question

我有一个CMakeLists.txt文件，正在使用GCC 68HC11 C编译器编译固件程序。

问题在于CMake正在追加＆＃34; -E＆＃34;编译器标志最后我不想要。其他附加标志＆＃34; -v＆＃34; ＆＃34; -dD＆＃34;和＆＃39; -D ___ CIDR ...＆＃34;也是不受欢迎的，但不会导致编译错误，因为＆＃34; -E＆＃34;确实。如何关闭这些附加标志？

我尝试了设置（CMAKE_C_FLAGS_DEBUG＆＃34;＆＃34;）但没有效果。

这是我的CMakeLists.txt文件的完整

cmake_minimum_required(VERSION 2.8.4)

# program names
set(HC11C    m6811-elf-gcc.exe)
set(OBJCOPY  m6811-elf-objcopy.exe)
set(OBJDUMP  m6811-elf-objdump.exe)

# Important project paths
set(LIB_INC_PATH "C:/library/gel-hc1x-1.6.1/include"
                    "C:/library/gel-hc1x-1.6.1/include/asm-m68hc11/arch-32k")
set(HC11C_PATH   "C:/GNUHC11/bin")

# Sets the compiler
# Needs to come before the project function
set(CMAKE_SYSTEM_NAME  Generic)
set(CMAKE_C_COMPILER   "${HC11C_PATH}/${HC11C}")

set(MAIN_FILE "TestProgram")                
project(${MAIN_FILE})

# Files to be compiled
set(BASE_PATH    "${${PROJECT_NAME}_SOURCE_DIR}")
set(INC_PATH     "${BASE_PATH}")
set(SRC_PATH     "${BASE_PATH}")

set(SRC_FILES   "${SRC_PATH}/${MAIN_FILE}.c"
                "${SRC_PATH}/Interrupts.c"
                "${SRC_PATH}/Utilities.c")

# Attempt to clear the other spurious compiler flags that I don't want, 
# and which cause a compiler arguments error.
# This doesn't seem to work - the defaults still appear.
set(CMAKE_C_FLAGS_DEBUG             "")
set(CMAKE_C_FLAGS_RELEASE           "")
set(CMAKE_C_FLAGS_RELWITHDEBINFO    "")
set(CMAKE_C_FLAGS_MINSIZEREL        "")

# Compiler flags
set(CWARN     "-Wl,-m,m68hc11elfb")         # build for elf file and use memory.x for memory map
set(CTUNING   "-mshort")                    # consider type int to be 16 bits
set(COPT      "-Os")                        # turn on optimizer
set(CDEFS     "-Dmc6811")                   # Add define to define the processor architecture for gel includes
set(CFILES    "${MAIN_FILE}.c Interrupts.c Utilities.c")

set(CFLAGS   "${CDEFS} ${COPT} ${CWARN} ${CTUNING} ${CFILES}")

set(CMAKE_C_FLAGS   "${CFLAGS}")

# Project setup
include_directories(${INC_PATH} ${LIB_INC_PATH})
add_executable(${MAIN_FILE} ${SRC_FILES})
set_target_properties(${MAIN_FILE} PROPERTIES OUTPUT_NAME "${MAIN_FILE}.elf")

# Compiling targets
add_custom_target(main ALL ${OBJCOPY} -O binary "${MAIN_FILE}.elf" "${MAIN_FILE}.bin"  DEPENDS ${MAIN_FILE})
add_custom_target(dump ALL ${OBJDUMP} -xDC --section=.text --section=.vectors "${MAIN_FILE}.elf" > "${MAIN_FILE}.dump" DEPENDS main)

set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${MAIN_FILE}.dump;${MAIN_FILE}.elf;${MAIN_FILE}.bin")

# Config logging
message("* ")
message("* Project Name:\t${PROJECT_NAME}")
message("* Project Source:\t${SRC_PATH}")
message("* Project Include:\t${INC_PATH}")
message("* Library Include:\t${LIB_INC_PATH}")
message("* ")
message("* Project Source Files:\t${SRC_FILES}")
message("* MAIN_FILE variable:\t${MAIN_FILE}")
message("* ")
message("* C Flags:\t${CMAKE_C_FLAGS}")
message("* ")

这是生成的编译器命令

C:\GNUHC11\bin\m6811-elf-gcc.exe "-xc" "-Dmc6811" "-Os" "-Wl,-m,m68hc11elfb" "-mshort" "TestProgram.c" "Interrupts.c" "Utilities.c" "-IC:\\DEVELO~1\\source" "-IC:\\library\\gel-hc1x-1.6.1\\include" "-IC:\\library\\gel-hc1x-1.6.1\\include\\asm-m68hc11\\arch-32k" "-v" "-dD" "-E" "-D___CIDR_IGNORE_DEFINITIONS_START"