CMAKE节俭生成的文件编译器选项

Question

我正在尝试将生成的< code>thrift代码编译到我的源代码中。将< code>thrift内容生成到< code > CMAKE _ CURRENT _ BINARY _ DIR 中，然后我使用< code>SYSTEM关键字将生成的cpp文件添加到我的库中。当我试图编译它时，由于我的模块使用< code>-Wsuggest-override进行编译，它无法编译生成的cpp文件，因为< code >可以标记为override[-Werror = suggest-override]。我不明白为什么，难道< code > SET _ SOURCE _ FILES _ PROPERTIES 不应该解决这个问题吗？< br>
CMake文件片段

ADD_COMPILE_OPTIONS(
        ...
        ...
        -Wsuggest-override
        ...
        ...
)
FIND_PROGRAM(THRIFT_COMPILER thrift ${_VCPKG_ROOT_DIR}/buildtrees/thrift/x64-linux-rel/compiler/cpp/bin/ NO_DEFAULT_PATH)
SET(ThriftOutputDir ${CMAKE_CURRENT_BINARY_DIR}/thrift/gen/)
FILE(MAKE_DIRECTORY ${ThriftOutputDir})

SET(ThriftGeneratedFiles
    ${ThriftOutputDir}/MyServer.cpp
    ${ThriftOutputDir}/My_types.cpp
    ${ThriftOutputDir}/My_constants.cpp
    )

ADD_CUSTOM_COMMAND(
        OUTPUT
        generated.timestamp
        COMMAND
        ${THRIFT_COMPILER} --gen cpp:no_default_operators -out ${ThriftOutputDir} ${CMAKE_SOURCE_DIR}/protocols/My.thrift
        WORKING_DIRECTORY
        ${CMAKE_BINARY_DIR}
        COMMENT "Generating source code from Thrift definition")
ADD_CUSTOM_TARGET(RunThriftCompiler
                  DEPENDS
                  generated.timestamp
                  COMMENT "Checking if re-generation is required")

ADD_LIBRARY(MyProject SHARED
            ${SOURCES}
            ${ThriftGeneratedFiles}
            )

SET_SOURCE_FILES_PROPERTIES(${ThriftGeneratedFiles} PROPERTIES
                            GENERATED 1
                            COMPILE_OPTIONS ""
                            )
TARGET_INCLUDE_DIRECTORIES(MyProject SYSTEM PRIVATE
                           ${PROTOBUF_INCLUDE_DIR}
                           ${ThriftOutputDir}
                           )

编译消息：

CD /home/user/Development/Project/Project16/cmake-build-debug/lib/MyProject

如图所示，将应用所有编译标志。

Answer 1

COMPILE_DEFINITIONS和COMPILE_FLAGS等源文件的属性只能添加一个编译选项。使用这些属性，不可能覆盖（删除）目标的编译选项。（由添加的选项ADD_COMPILE_OPTIONS最终会为目标分配）。

您可以从节俭生成的源创建 OBJECT 库。对于该库，您可以设置（即清除）COMPILE_OPTIONS属性。生成的对象文件可以在主库中使用：

# Object files for thrift-generated sources
add_library(thriftGenerated OBJECT ${ThriftGeneratedFiles})
# For these files clear compile options which has been set before
set_property(TARGET thriftGenerated PROPERTY COMPILE_OPTIONS)

# Then use object files for thrift-generated sources in other library
add_library(MyProject SHARED
    ${SOURCES}
    $<TARGET_OBJECTS:thriftGenerated>
)