I have an OSX app built on 10.11.1, deployment target 10.9. The app builds and
runs without any AutoLayout issues or warnings from Xcode. I have ambiguities
turned on.
The problem is when I try to run the app on 10.9. Although the app will run
without fatally crashing, one of its main windows won’t open. In Console, on
launch I first see the message
“Unable to create description in
descriptionForLayoutAttribute_layoutItem_coefficient. Something is nil.”
If I then try to open the window from a menu command, I get the stacktrace
(relevant part appended below). I see the ‘mutually exclusive’ error starting
at line 18 in the trace, but I’ve manually been through the constraints and
can’t see any conflicts. I’ve also removed all constraints and had Xcode do
“Add Missing Constraints” after that. Again, no AutoLayout errors on build, but
still the mutually exclusive exception occurs on 10.9.
Does anyone have any debugging tips as to how do I can find the source of the
problem when neither Xcode nor Console on my build machine make any complaints?
Best
Phil
0 CoreFoundation 0x00007fff9497025c
__exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff92de3e75
objc_exception_throw + 43
2 CoreFoundation 0x00007fff9497010c
+[NSException raise:format:] + 204
3 Foundation 0x00007fff8f98cc55
descriptionForLayoutAttribute_layoutItem_coefficient + 145
4 Foundation 0x00007fff8f98caaf
-[NSLayoutConstraint equationDescription] + 215
5 Foundation 0x00007fff8f98cf3e
-[NSLayoutConstraint description] + 298
6 CoreFoundation 0x00007fff949620e1 -[NSArray
descriptionWithLocale:indent:] + 481
7 Foundation 0x00007fff8f7517bb
_NSDescriptionWithLocaleFunc + 64
8 CoreFoundation 0x00007fff9485ece4
__CFStringAppendFormatCore + 7332
9 CoreFoundation 0x00007fff9488d263
_CFStringCreateWithFormatAndArgumentsAux + 115
10 CoreFoundation 0x00007fff948c4aeb _CFLogvEx +
123
11 Foundation 0x00007fff8f77b32c NSLogv + 79
12 Foundation 0x00007fff8f77b2b8 NSLog + 148
13 AppKit 0x00007fff8f1dc194
-[NSView(NSConstraintBasedLayout)
engine:willBreakConstraint:dueToMutuallyExclusiveConstraints:] + 114
14 Foundation 0x00007fff8f98713e -[NSISEngine
handleUnsatisfiableRowWithHead:body:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:]
+ 507
15 Foundation 0x00007fff8f98789c -[NSISEngine
tryUsingArtificialVariableToAddConstraintWithMarker:rowBody:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:]
+ 379
16 Foundation 0x00007fff8f784e89 -[NSISEngine
tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:]
+ 663
17 Foundation 0x00007fff8f98d897
-[NSLayoutConstraint
_addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:]
+ 285
18 Foundation 0x00007fff8f7792cf
-[NSLayoutConstraint
_addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 204
19 AppKit 0x00007fff8e97520b
__52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 411
20 Foundation 0x00007fff8f7873aa -[NSISEngine
withBehaviors:performModifications:] + 119
21 AppKit 0x00007fff8e8d795c
-[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] +
66
22 AppKit 0x00007fff8e975049
__52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 433
23 AppKit 0x00007fff8e8da4fa
-[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 229
24 AppKit 0x00007fff8e975122
__52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 178
25 Foundation 0x00007fff8f7873aa -[NSISEngine
withBehaviors:performModifications:] + 119
26 AppKit 0x00007fff8e8d795c
-[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] +
66
27 AppKit 0x00007fff8e975049
__52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 433
28 AppKit 0x00007fff8e8da4fa
-[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 229
29 AppKit 0x00007fff8e97ab9e
make_and_host_engine + 256
30 AppKit 0x00007fff8e97a8e7
-[NSView(NSConstraintBasedLayout) _didChangeHostsAutolayoutEngineTo:] + 165
31 AppKit 0x00007fff8e91ccce
-[NSView(NSConstraintBasedLayout) _engageAutolayout] + 81
32 AppKit 0x00007fff8e91cceb
-[NSView(NSConstraintBasedLayout) _engageAutolayout] + 110
33 AppKit 0x00007fff8e8e240a
-[NSView(NSConstraintBasedLayout) _layoutEngine_windowDidChange] + 87
34 AppKit 0x00007fff8f01c8ee __21-[NSView
_setWindow:]_block_invoke643 + 67
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