问题
I have an Xcode project for iOS in Xcode 7.0 that contains Objective-C, C++, and C code. Xcode tries to compile the C++ header files with the extension .h (not .hpp) as C header files which generates errors.
How do I fix this? There should be a setting for which files should be compiled as which language.
回答1:
Individually header files doesn't compiled. Compiled source files where they included. If you include them in .c they will be compiled like C, if in .m - like Objective-c, if in .cpp - like C++, if in .mm - like Objective-C++.
It doesn't matter how you name them .h or .hpp.
If you have some portion of C++ code in h-file- you should put it in
#ifdef __cplusplus
#endif
If you have some portion of Objective-C code in h-file you should put it in
#ifdef __OBJC__
#endif
This will make code inside this statement invisible for other languages.
You can find this statement in Xcode's generated pch-file.
来源：https://stackoverflow.com/questions/32827389/force-header-files-to-compile-as-c-in-xcode