Objective-C errors with Xcode

Question

I added a simple class to my Xcode command line tool project. The class is shown below:

#import <Foundation/Foundation.h>

@interface Foo : NSObject {
}
@end

and

#import "Foo.h"

@implementation Foo
@end

As soon as I reference Foo.h using #import "Foo.h" in my main file I get all type of errors. I have Foundation.frameowork added as my frameworks.

/Developer/SDKs/MacOSX10.6.sdk/System/
    Library/Frameworks/Foundation.framework/Headers/
NSObjCRuntime.h:189:1: error: expected identifier or '(' [3]

/Developer/SDKs/MacOSX10.6.sdk/System/
    Library/Frameworks/Foundation.framework/Headers/
NSObjCRuntime.h:197:50: error: unknown type name 'Protocol' [3]

NSGod · Accepted Answer · 2011-04-04 21:29:23Z

8

I'm guessing that you probably need to rename main.c to main.m? Otherwise, can you post the content of your main file?

answered Apr 4, 2011 at 21:29

NSGod

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5 Comments

azamsharp Over a year ago

Awesome! It worked! Thanks man! So, what is the reason behind this that .c did not work but .m worked!

Sherm Pendley Over a year ago

The reason is simple: C and Objective-C are not the same language. Compiling your code as C means that Objective-C features such as classes will not be understood by the compiler.

Georg Schölly Over a year ago

GCC or whatever compiler you use makes an educated guess what language you're using in your file. If it has the suffix .c, it assumes C instead of Objective-C. You could however override with compiler flags. In your case however, I don't see any reason not to use the suffix .m.

Sherm Pendley Over a year ago

To avoid this in the future, when you create the new project, select "Foundation" as the type instead of "C". That will give you a main file that's correctly named, and a main() function that already has an autorelease pool.

azamsharp Over a year ago

@Shem Pendley, Thanks! Good advice! I will remember that in the future and then select Foundation instead of C.

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