xcode OpenCV 构建问题，找不到 ext/atomicity.h
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OpenCV build issue, can't find ext/atomicity.h
提问by TomSwift
I get the compiler error complaining about <ext/atomicity.h>when building a project incorporating OpenCV. Environment is Xcode 4.5 targeting iOS. It compiles fine for the simulator but fails when building for the device. Here's the error text:
<ext/atomicity.h>在构建包含 OpenCV 的项目时，我收到编译器错误的抱怨。环境是针对 iOS 的 Xcode 4.5。它为模拟器编译良好，但在为设备构建时失败。这是错误文本：
/Users/Nick/projects/ios/opencv2.framework/Headers/core/operations.hpp:65:16: fatal error: 'ext/atomicity.h' file not found
#include <ext/atomicity.h>
I'm using the opencv2.framework, builusing cmake, using the instructions here.
我正在使用 opencv2.framework，构建 cmake，使用这里的说明。
回答by TomSwift
By default XCode 4.5 generates new projects to build using the libc++ (LLVM C++ standard library with C++ 11 support). But OpenCV is expecting to be built against the GNU libstdc++ (GNU C++ standard library). <ext/atomicity.h>is apparently a GNU extension and isn't part of the LLVM libc++ standard library.
默认情况下，XCode 4.5 使用libc++ (LLVM C++ standard library with C++ 11 support). 但是 OpenCV 预计是针对 GNU 构建的libstdc++ (GNU C++ standard library)。 <ext/atomicity.h>显然是 GNU 扩展，而不是 LLVM libc++ 标准库的一部分。
In your project's target settings, select libstdc++ (GNU C++ standard library)for the C++ Standard Library setting.
在项目的目标设置中，选择libstdc++ (GNU C++ standard library)C++ 标准库设置。
Very likely the atomicity.h requirement could be factored out of opencv or otherwise done in a LLVM libc++ compatible way. I didn't explore this but would be interested if anyone had insight on how this could be done.
很可能 atomicity.h 要求可以从 opencv 中分解出来，或者以 LLVM libc++ 兼容的方式完成。我没有探索这个，但如果有人对如何做到这一点有深入的了解，我会很感兴趣。
回答by Pierre Fite Georgel
I think it is the other way around. Looking at the output of the python script that builds opencv2.framework I get this:
我认为情况正好相反。查看构建 opencv2.framework 的 python 脚本的输出，我得到了这个：
-- C++ flags (Release): -stdlib=libc++ -headerpad_max_install_names -fvisibility=hidden -fvisibility-inlines-hidden -fPIC -DNDEBUG -O3 [...]
-- C++ 标志（发布）：-stdlib=libc++ -headerpad_max_install_names -fvisibility=hidden -fvisibility-inlines-hidden -fPIC -DNDEBUG -O3 [...]
which is most likely not what you want. So you need to compile the framework with libstdc++ or compile your app with the proper lib. From what I see I get problems when building my apps with libc++ but that might be me.
这很可能不是您想要的。因此，您需要使用 libstdc++ 编译框架或使用适当的 lib 编译您的应用程序。从我所见，我在使用 libc++ 构建应用程序时遇到了问题，但那可能是我。
