#include编译错误在可可应用程序中

发布于 2024-12-06 11:38:20 字数 454 浏览 0 评论 0原文

我正在尝试在 xcode 4.0 中编译 Cocoa 应用程序，但遇到此错误...

fatal error: 'string' file not found

...当尝试在这一行上编译为 .pch 文件时：

#include <string>

我有另一个 xcode 项目执行相同的操作，但不执行此操作得到错误。我已经搜索了一些不同的构建设置，但找不到。唯一的区别是编译成功的项目是作为命令行项目启动的，而不是 Cocoa 项目，但构建设置是相同的。

目标操作系统是 Mac OS X 10.6

编译预编译头时会发生错误，并且无法访问任何其他文件。编译版本唯一的框架是Foundation.framework，非编译版本也有。

为什么它在一个项目中找不到，而在另一个项目中却找不到？有什么建议吗？

原文

I am trying to compile a Cocoa app in xcode 4.0 and I'm getting this error...

fatal error: 'string' file not found

...when trying to compile to .pch file on this line:

#include <string>

I have another xcode project that does the same thing, but does not get the error. I have scoured the build settings for some different, but I can't find one. The only difference is that the project that compiles OK was started as a command line project, not a Cocoa project, but the build setting are the same.

The target OS is Mac OS X 10.6

The error happens when compiling the precompiled header and doesn't get to any of the other files. The only framework that the compiling version has is Foundation.framework and the non-compiling one has it as well.

Why is it not finding in one project and not the other? Any advice?

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花开浅夏 2024-12-13 11:38:20

你的源文件的扩展名是什么？如果是“.m”，尝试将其更改为obj-cpp“.mm”，以便Xcode推断出正确的语言。
或者只是将特定于 c++ 的标头放入“#ifdef __cplusplus”块中

更新

项目中编译的每种语言都必须存在防护，因为此特定包含位于 pch 中。 IOW，如果都是 c++ 和/或 objc++ 就不会出现错误。显然，至少有一个文件不能识别C++（例如C 或ObjC 源代码也在目标中编译）。因此，你只需像这样保护它：

// MONPrefix.pch

#ifdef __cplusplus
#include <string>
#endif

// same for objc, so your C and C++ sources compile with no error:
#ifdef __OBJC__
#include <Foundation/Foundation.h>
#endif

What is the extension of your source files? If it is ".m", try to change it to obj-cpp ".mm", so that Xcode will deduce correct language.
Or just put c++-specific headers inside "#ifdef __cplusplus" block

Update

The guard must exist for each language compiled in the project because this specific include is in the pch. IOW, if it were all c++ and/or objc++ there would be no error. Evidently, there is at least one file that does not recognize C++ (e.g. C or ObjC sources are also compiled in the target). Therefore, you simply guard it like so:

// MONPrefix.pch

#ifdef __cplusplus
#include <string>
#endif

// same for objc, so your C and C++ sources compile with no error:
#ifdef __OBJC__
#include <Foundation/Foundation.h>
#endif

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