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Compile C # include <string> errors in Cocoa application

I am trying to compile a Cocoa application in xcode 4.0 and I am getting this error ...

fatal error: 'string' file not found

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

 #include <string>

I have another xcode project that does the same thing but does not get an error. I looked at the build settings for some different ones, but I can not find them. The only difference is that the project that compiles OK started as a command-line project, not a Cocoa project, but the build option is the same.

Target OS - Mac OS X 10.6

An error occurred while compiling the precompiled header and did not fall into any of the other files. The only structure that has a compilation version is the Foundation.framework framework and non-compiling.

Why doesn't he find it in one project and not in another? Any tips?

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2 answers

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

Update

A protector must exist for every language compiled in the project, because this particular include is in pch. IOW, if all C ++ and / or objC ++ had no errors. Obviously, there is at least one file that C ++ does not recognize (for example, C or ObjC sources are also compiled to the target). Therefore, you simply protect it like this:

 // 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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string - C ++ header (for std :: string). If you are looking for things like strcpy you need to include string.h

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