CMake 和 XCode：“找不到‘NSObject’的接口声明”

我正在尝试使用 CMake 生成 XCode 项目，但遇到了一些问题。

CMake 生成的项目很好，但后来很明显它没有链接到 Foundation 和 UIKit 框架。我对 CMake 还很陌生，一直在努力克服这个问题，但没有成功。

CMake 输出（部分）：

...
Framework Foundation found at /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/System/Library/Frameworks/Foundation.framework
Framework CoreGraphics found at /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/System/Library/Frameworks/CoreGraphics.framework
Framework UIKit found at /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/System/Library/Frameworks/UIKit.framework
Configuring done
Generating done

下面是我的CMakeLists.txt文件（将几个答案放在一起）：

cmake_minimum_required(VERSION 2.8)

macro(ADD_FRAMEWORK fwname appname libpath)
    find_library(FRAMEWORK_${fwname}
        NAMES ${fwname}
        PATHS ${libpath}

        PATH_SUFFIXES Frameworks
        NO_DEFAULT_PATH)
    if( ${FRAMEWORK_${fwname}} STREQUAL FRAMEWORK_${fwname}-NOTFOUND)
        MESSAGE(ERROR ": Framework ${fwname} not found")
    else()
        TARGET_LINK_LIBRARIES(${appname} ${FRAMEWORK_${fwname}})
        MESSAGE(STATUS "Framework ${fwname} found at ${FRAMEWORK_${fwname}}")
    endif()
endmacro(ADD_FRAMEWORK)

project(test)
set(NAME test)
set (libpath /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/System/Library)


file(GLOB headers *.h)
file(GLOB sources *.m)

set(CMAKE_OSX_SYSROOT iphoneos4.2)
set(CMAKE_OSX_ARCHITECTURES $(ARCHS_STANDARD_32_BIT))
set(CMAKE_CXX_FLAGS "-x objective-c++")
set(CMAKE_EXE_LINKER_FLAGS
    "-framework AudioToolbox -framework CoreGraphics -framework QuartzCore -framework UIKit -framework Foundation"
)

set(MACOSX_BUNDLE_GUI_IDENTIFIER "com.mycompany.\${PRODUCT_NAME:identifier}")
set(APP_TYPE MACOSX_BUNDLE)

add_executable(${NAME}
    ${APP_TYPE}
    ${headers}
    ${sources}
)

ADD_FRAMEWORK(Foundation ${NAME} ${libpath})
ADD_FRAMEWORK(CoreGraphics ${NAME} ${libpath})
ADD_FRAMEWORK(UIKit ${NAME} ${libpath})

# code signing
set_target_properties(${NAME} PROPERTIES XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "iPhone Developer: Some Name")

我有几个建议：

• 不要使用add_framework。这使得 CMake 设置项目属性FRAMEWORK_SEARCH_PATHS这不知何故搞砸了一切。而是使用命令行开关-framework
• for CMAKE_OSX_SYSROOT你可以只使用iphoneos
• 你不需要CMAKE_CXX_FLAGS

有了这些，你可能会有更多的运气。到目前为止，我设法克服了大部分链接错误。