CMake为Xcode目标与正常目标

概述我有这个简单的C 11代码. #include <vector>#include <iostream>#include <memory>using namespace std;class A{ int x;public: A() {} ~A() {} A(A& a) {} A(int x) {this->x = x;} int get 我有这个简单的C 11代码.

#include <vector>#include <iostream>#include <memory>using namespace std;class A{    int x;public:    A() {}    ~A() {}    A(A& a) {}    A(int x) {this->x = x;}    int get() {return x;}};int main(){    vector<unique_ptr<A>> v;    auto a = new A(10);    unique_ptr<A> pa(a);    v.push_back(move(pa)); // move(pa);    auto a2 = new A(20);    unique_ptr<A> pb(a2);    v.push_back(move(pb)); // move(pa);    for (auto& i: v)    {        cout << i->get();    }}

我正在尝试使用Xcode和clang上的CMake设置构建此代码.

这是CMakeLists.txt文件：

cmake_minimum_required(VERSION 2.8)project( testit )set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++")set(testit    testit.cpp    )add_executable(gv ${testit})

clang build.

> mkdir build和cd build
> export CC = /usr/bin/clang
>导出CXX = /usr/bin/clang
> cmake ..
>制作

我可以得到工作正常的二进制文件.

Xcode 4.5目标

>同样的步骤1-3
> cmake .. -G Xcode
> xcodebuild

编译工作正常,但我在构建中出现错误,带有未定义的符号错误.
我在CMake集中使用此命令设置C 11(CMAKE_CXX_FLAGS“-std = c 11 -stdlib = libc”).

Undefined symbols for architecture x86_64:  "std::__1::__vector_base_common<true>::__throw_length_error() const",referenced from:      voID std::__1::vector<std::__1::unique_ptr<A,std::__1::default_delete<A> >,std::__1::allocator<std::__1::unique_ptr<A,std::__1::default_delete<A> > > >::__push_back_slow_path<std::__1::unique_ptr<A,std::__1::default_delete<A> > >(std::__1::unique_ptr<A,std::__1::default_delete<A> >&&) in testit.o  "std::__1::basic_ostream<char,std::__1::char_traits<char> >::operator<<(int)",referenced from:      _main in testit.o  "std::__1::cout",referenced from:      _main in testit.old: symbol(s) not found for architecture x86_64clang: error: linker command Failed with exit code 1 (use -v to see invocation)

可能有什么问题？

添加

从这个链接,似乎CMake的xbuildcode的目标设置是错误的：
http://www.executionunit.com/blog/2012/10/27/xcode-std-link-errors/

添加

我可以解决这个问题,但我必须使用CMakeLists.txt文件所在的目录.

当我执行CMake .. -G XCode时,我又遇到了另一个错误.

=== BUILD AGGREGATE TARGET ZERO_CHECK OF PROJECT XcodeTest WITH THE DEFAulT CONfigURATION (DeBUG) ===Check dependencIEsPhaseScriptExecution "CMake Rules" build/XcodeTest.build/DeBUG/ZERO_CHECK.build/Script-bed7FB205C634C34A1ACD293.sh    cd /Users/smcho/Desktop/cmake    /bin/sh -c /Users/smcho/Desktop/cmake/build/XcodeTest.build/DeBUG/ZERO_CHECK.build/Script-bed7FB205C634C34A1ACD293.shecho ""make -f /Users/smcho/Desktop/cmake/build/CMakeScripts/ReruncMake.makemake[1]: *** No rule to make target `/Users/smcho/Desktop/cmake/build/CMakefiles/2.8.10.2/CMakeCCompiler.cmake',needed by `CMakefiles/cmake.check_cache'.  Stop.make: *** [/Users/smcho/Desktop/cmake/build/CMakefiles/ZERO_CHECK] Error 2Command /bin/sh Failed with exit code 2** BUILD Failed **The following build commands Failed:    PhaseScriptExecution "CMake Rules" build/XcodeTest.build/DeBUG/ZERO_CHECK.build/Script-bed7FB205C634C34A1ACD293.sh

解决方法 有两个问题.

链接器选项

正如Fraser指出的那样,问题来自链接器中的设置.

...    set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++")set(CMAKE_EXE_linkER_FLAGS "${CMAKE_EXE_linkER_FLAGS} -stdlib=libc++")...

Add_subdirectory

我不知道为什么会这样,但我需要在主CMakeLists.txt文件中使用add_subdirectory(src),并在该src目录中创建另一个CMakeLists.txt文件,以便在build目录中运行CMake.没有它,我必须在CMakeLists.txt文件所在的同一目录中运行CMake.请参阅Stack Overflow问题CMake Xcode generator creates a project that cannot build

这是src目录中的CMakeLists.txt：

set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++")file ( GLOB SRCS *.cpp )add_executable( program ${SRCS})

这是主目录中的CMakeLists.txt：

project( XcodeTest )cmake_minimum_required( VERSION 2.6 )set(CMAKE_EXE_linkER_FLAGS "${CMAKE_EXE_linkER_FLAGS} -stdlib=libc++")add_subdirectory(src)

我从YouTube视频中得到了提示：CMake XCode Demo

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