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Editorial Team
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Asked: 2026-05-12T11:15:57+00:00

EDIT: I have fixed all but two warnings now, so thank you all for

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EDIT: I have fixed all but two warnings now, so thank you all for the advice and the encouragement. The two warnings I have left would require me to change the database:

/Locations.xcdatamodel:tiles.Map: warning: tiles.Map — relationship does not have an inverse

/Locations.xcdatamodel:Waypoint.description: warning: Waypoint.description — property name conflicts with a method already on NSObject or NSManagedObject

I have an iPhone app that throws more than 100 warnings when I compile it, but it is time-tested and solid.

Should I care about warnings?

EDIT Because the respondents asked, here are some of my warnings:

Warning: Multiple build commands for output file /Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/build/Debug-iphonesimulator/Gaia Places.app/wrench.png

/Locations.xcdatamodel:tiles.Map: warning: tiles.Map -- relationship does not have an inverse 

/Locations.xcdatamodel:Waypoint.description: warning: Waypoint.description -- property name conflicts with a method already on NSObject or NSManagedObject 

/TrailTrackerAppDelegate.m:58: warning: passing argument 1 of 'initWithViewController:withTitle:' from distinct Objective-C type
/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/TrailTrackerAppDelegate.m: In function '-[TrailTrackerAppDelegate applicationDidFinishLaunching:]':

/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/TrailTrackerAppDelegate.m:202: warning: no '-initWithFrame:forHelpScreen:' method found
/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/TrailTrackerAppDelegate.m:202: warning: (Messages without a matching method signature

/TrailTrackerAppDelegate.m:329: warning: 'gpsController' may not respond to '-setAccuracy:'
/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes

/TrailTrackerAppDelegate.m:411: warning: local declaration of 'tabBarController' hides instance variable

/TrailTrackerAppDelegate.m:422: warning: 'TrailTrackerAppDelegate' may not respond to '-getAudioPlayer:'

/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/TrailTrackerAppDelegate.m:633: warning: 'Reachability' may not respond to '-isHostReachable:'

/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/TrailTrackerMapView.h:18: warning: 'myTopoMapSource' defined but not used

warning: 'dbCache' defined but not used

/TrailTrackerAppDelegate.m:58: warning: passing argument 1 of 'initWithViewController:withTitle:' from distinct Objective-C type
  /Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes

/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/TripViewController.m:68: warning: 'TripViewController' may not respond to '-checkForNullImages'

/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/TripViewController.m:94: warning: 'TrailTrackerAppDelegate' may not respond to '-blamblamblam'

/Users/andrewljohnson/Desktop/thetrailbehind/TrailTracker/Classes/MapViewController.m:406: warning: passing argument 1 of 'initWithData:' from distinct Objective-C type
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1 Answer

  1. Editorial Team

    Yes. Some Warnings can be important.

    It’s best practice to turn a compiler’s warning level to the highest setting, and to try to eliminate all warnings.

    If a warning cannot be removed through refactoring code, and it has been checked and deemed safe, then many languages have ‘pragmas’ to silence the warning.

    Update circa 2014: It is increasingly common to turn on a complier option that treats all warnings as errors. I personally do this.

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