How resolve error:Conflicting type for “snprintf”

Question

In my app i used Compiler for C/C++/Objective-C is Apple LLVM compiler 4.1 for simulator. For simulator this is working. When i compiling same code for Device i changed Compiler for C/C++/Objective-C is LLVM GCC 4.2. This time i am getting error in stdio.h "Conflicting types for"sprintf" ".

I am using Mac OS x 10.7.4 Xcode 4.5(iOS 6)

This is working fine in (Mac OS x 10.7.4 & Xcode 4.2.3(iOS 5)) && (Mac OS x 10.6.8 & Xcode 3.2.3(iOS 4)).

What is the difference between iOS 5 and iOS 6 for LLVM Compiler. any one please help me?

Answer 1

I see this warning when compiling a Universal App under Mac OS X, when using data types NSInteger or NSUInteger:

NSInteger thing = 7;
NSLog(@"Thing is %ld", thing);

This will work under 64-bit, but give warnings under 32-bit (hint; iOS uses 32-bit architecture).

The (ugly) solution is to force thing to long in this case:

NSLog(@"Thing is %ld", (long)thing);

Which will work everywhere.

This is better than:

#ifdef __x86_64
NSLog(@"Thing is %ld", thing);
#else
NSLog(@"Thing is %d", thing);
#endif