Question

I thought to know how to declare functions inside .m files, but here I get a linker error.I declare this in the .h file:

#import <Foundation/Foundation.h>
// Other rimports

void SQLite3HelperHandle(NSError* error);

@interface SQLite3Helper : NSObject

// Method signatures

@end

Then in the .m file:

#import "SQLite3Helper.h"

void SQLite3HelperHandle(NSError* error)
{
    // Method body
}

@implementation SQLite3Helper

// Methods implementation

@end

But I get a linker error.And the error has a lot of unreadable information.The only relevant thing is:

“_SQLite3HelperHandleError”, referenced from:

Also, how do I declare it inline? I tried declaring it this way in the header:

extern inline void SQLite3HelperHandle(NSError* error);

And normally in the .m file:

void SQLite3HelperHandle(NSError* error);

I also tried other ways to do it, but never found the way to silent that linker error.
It should be as fast as a macro, but the function it too long to write and I prefer type checking so that’s why I need an inline function.

Answer 1

It sounds like the .m file needs to be included in the target you’re building.

I use FOUNDATION_EXPORT void ... in the .h and just what you have in the .m file.