Apple Mach O Linker warning

Question

I am getting this annoying warning

Apple Mach-O Linker Warning
Alignment lost in merging tentative definition _searchFlag

i have declared the search flag in the constant.h file like this

BOOL searchFlag

I am stuck up on this issue from the past 2 days and i have tried all the possible solutions from google but none of them seems to be working.

My app supports both armv6 and v7 arch for which i have added the settings but this dosent seems to be the problem, its just this bool flag that is biting my head since 2 days.

Please help me out on this Thanks

Answer 1

Globals in headers are bad juju in ObjC; I'm not making a judgement on the use of globals (as they truly are sometimes necessary), but I would go about declaring them in a different way.

The cleanest and easiest method I can think of (and my preferred method), is to create a new class that implements accessors for your globals as class methods, and declares the variables themselves as static variables in the source file.

myglobal.h

@interface MyGlobal : Object
{
}

+ (BOOL)searchFlag;
+ (void)setSearchFlag:(BOOL)aFlag;

@end


myglobal.m

#import "myglobal.h"

// Static variables
static BOOL _searchFlag = NO;

@implementation MyGlobal

+ (BOOL)searchFlag
{
    return _searchFlag;
}

+ (void)setSearchFlag:(BOOL)aFlag
{
    _searchFlag = aFlag;
}

@end

Using this method, accessing globals is as easy as [MyGlobal searchFlag] or [MyGlobal setSearchFlag: YES].