问题
I'm trying to compile a swift program that uses code written in Objective-C on a VM running Linux (Ubuntu 16.0.4, Swift 4.0.3).
I get this error when compiling :
fatal error: 'Foundation/Foundation.h' file not found
#import <Foundation/Foundation.h>
^
1 error generated.
On Mac OS
The same program works perfectly on Mac OS.
What have I tried ?
I've tried reverting to swift 3.1.1 (I remember this working on swift 3 a while ago).
I've googled the problem, extensively, and had no success.
I've followed instructions on how to install the Objective-C runtime on Linux and installed GNUStep (see http://www.techotopia.com/index.php/Installing_and_Using_GNUstep_and_Objective-C_on_Linux)
All with no success.
why am I using objective-C ?
(Anticipating this question).
I need to call a python script from the program. Python has a library for C, which I can only use with C or Objective-C.
In fact, commenting out the line #import <Foundation/Foundation.h> makes compilation fail when importing the Python library :
fatal error: 'Python/Python.h' file not found
#include <Python/Python.h>
^
1 error generated.
回答1:
Swift on Linux is not interoperable with Objective-C, it is interoperable with C.
According to https://github.com/apple/swift-package-manager/blob/master/Documentation/Usage.md#c-language-targets, you can have plain C code as part of your package, in a separate target.
You can also link your package with a C library, see https://github.com/apple/swift-package-manager/blob/master/Documentation/Usage.md#c-language-targets.
In your case I would use the later approach and would link your code with the Python C library.
来源：https://stackoverflow.com/questions/47997335/swift-objective-c-interoperability-on-linux-error-foundation-foundation-h-fi