链接错误编译一个混合的目标C / C ++项目与C ++ 11支持在xcode 4.5.2 [英] Link errors compiling a mixed objective-C/C++ project with C++11 support in xcode 4.5.2

问题描述

我试图编译一个工作区的3个项目，支持C ++ 11。这组项目已成功使用LLVM编译器缺省值进行编译和链接。此外，c ++代码以前编译过许多编译器，包括g ++，llvm，msvc，sun，irix等，所以它是非常干净的代码。

I am trying to compile a workspace of 3 projects with C++11 support. This set of projects has successfully compiled and linked using LLVM compiler defaults. In addition, the c++ code has previously compiled on a number of compilers including g++, llvm, msvc, sun, irix etc so it is very clean code.

语言方言部分的工作区构建设置有3个行项：

Under the c++ language dialect section of the workspace build settings there are 3 line items:

c语言方言

c ++语言方言

c ++标准库

c language dialect
c++ language dialect
c++ standard library

使用设置：

c语言方言：编译器默认

c ++语言方言：编译器默认

c ++标准库：libc ++（支持c ++ 11的LLVM c ++标准库）

c language dialect: compiler default
c++ language dialect: compiler default
c++ standard library: libc++ (LLVM c++ standard library with c++11 support)

很多链接错误。一些来自我们自己的函数，一些来自标准函数。下面是标准函数的链接错误示例：

I can successfully compile but get many link errors. Some are from our own functions and some are from standard functions. Here is a sample of link errors to standard functions:

（null）：std :: string :: find_last_of（char const *，unsigned long）const从：
（null）：std :: string :: size（）const，引用自：

(null): "std::string::find_last_of(char const*, unsigned long) const", referenced from: (null): "std::string::size() const", referenced from:

看起来很清楚，错误的标准库，所以我调查了改变上面的各种选项。将方言更改为-std = c ++ 11甚至打破了我的编译。我找不到适合我的组合。

It seemed clear that I was linking to the wrong standard library, so I investigated changing various options above. Changing the dialect to -std=c++11 even broke my compilation. I could not find a combination that worked for me.

你能建议什么错误吗？

：我的动机是这样做的，我想在我的c ++代码中使用接口与objective-c（和那个c ++代码仍然是可移植的）

my motivation for doing this is that I want to use std::thread in my c++ code that interfaces with objective-c (and have that c++ code still be portable)

推荐答案

XCode 4.5.2 / OSX 10.8.2

XCode 4.5.2 / OSX 10.8.2

我一直在得到这些

(null): "std::string::find_last_of(char const*, unsigned long) const", 
 referenced from: (null):    "std::string::size() const", referenced from:

不同版本的openCV图书馆。似乎问题是访问C ++标准库。在这种情况下，工作设置如下：

Variously with different versions of openCV libraries. It seems like the issue is access to the C++ standard library. In this case working settings were as follows:

旧版库：

C Language Dialect GNU99[-std=gnu99]
C++ Language Dialect GNU++11[-std=gnu++11]
C++ Standard Library libstdc++ (GNU C++ standard library)

最近的图书馆版本：

C Language Dialect GNU99[-std=gnu99]
C++ Language Dialect GNU++11[-std=gnu++11]
C++ Standard Library libc++ (LLVM C++ standard library with C++11 support)

将标准库规范切换到其中一个版本会产生这些错误。

Toggling the standard library spec to either version yields those errors.

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