How to debug and fix backwards compatibility issues?

WoodenBrain · July 16, 2005, 2:09pm

HI…

I have recently found that a project I built with Xcode 2.1 on Tiger crashes on 10.3.8 and 10.3.9.

I have absolutely no idea how to debug this, let alone fix it.

Anyone have an idea about this? I tried Jonn8’s suggestion about 10.2 involving sudo gcc_select 3.3, but that did not help.

Here’s the crash log from a friend’s 10.3.8 system.

Date/Time: 2005-07-16 10:01:02 -0400
OS Version: 10.3.8 (Build 7U16)
Report Version: 2

Command: Cast Away
Path: /Installers/Cast Away.app/Contents/MacOS/Cast Away
Version: 1.0 (1.0b1)
PID: 1885
Thread: 0

Exception: EXC_BREAKPOINT (0x0006)
Code[0]: 0x00000001
Code[1]: 0x90a5c740

Thread 0 Crashed:
0 com.apple.Foundation 0x90a5c740 _NSRaiseError + 0xf8
1 com.apple.Foundation 0x90a5c624 +[NSException raise:format:] + 0x2c
2 com.apple.Foundation 0x909f785c _decodeObjectBinary + 0x684
3 com.apple.Foundation 0x90a0e7ac -[NSKeyedUnarchiver
_decodeArrayOfObjectsForKey:] + 0x29c
4 com.apple.Foundation 0x90a06070 -[NSArray initWithCoder:] + 0x170
5 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
6 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
7 com.apple.AppKit 0x92df3414 -[NSView initWithCoder:] + 0xf8
8 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
9 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
10 com.apple.AppKit 0x92ef5918 -[NSTabViewItem initWithCoder:] +
0xc8
11 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
12 com.apple.Foundation 0x90a0e7ac -[NSKeyedUnarchiver
_decodeArrayOfObjectsForKey:] + 0x29c
13 com.apple.Foundation 0x90a06070 -[NSArray initWithCoder:] + 0x170
14 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
15 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
16 com.apple.AppKit 0x92f3d8d4 -[NSTabView initWithCoder:] + 0x98
17 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
18 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
19 com.apple.AppKit 0x92e28cf4 -[NSResponder initWithCoder:] + 0x60
20 com.apple.AppKit 0x92df3374 -[NSView initWithCoder:] + 0x58
21 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
22 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
23 com.apple.AppKit 0x92e28cf4 -[NSResponder initWithCoder:] + 0x60
24 com.apple.AppKit 0x92df3374 -[NSView initWithCoder:] + 0x58
25 com.apple.AppKit 0x92e78640 -[NSScrollView initWithCoder:] +
0x60
26 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
27 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
28 com.apple.AppKit 0x92e28cf4 -[NSResponder initWithCoder:] + 0x60
29 com.apple.AppKit 0x92df3374 -[NSView initWithCoder:] + 0x58
30 com.apple.AppKit 0x92e4f3e4 -[NSClipView initWithCoder:] + 0x3c
31 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
32 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
33 com.apple.AppKit 0x92e28cf4 -[NSResponder initWithCoder:] + 0x60
34 com.apple.AppKit 0x92df3374 -[NSView initWithCoder:] + 0x58
35 com.apple.AppKit 0x92e2c1ac -[NSControl initWithCoder:] + 0x3c
36 com.apple.AppKit 0x92e9338c -[NSTableView initWithCoder:] + 0x90
37 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
38 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
39 com.apple.AppKit 0x92e222e0 -[NSActionCell initWithCoder:] +
0x1a0
40 com.apple.AppKit 0x92e48f7c -[NSButtonCell initWithCoder:] +
0x44
41 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
42 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
43 com.apple.AppKit 0x92e2682c -[NSNibConnector initWithCoder:] +
0x84
44 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
45 com.apple.Foundation 0x90a0e7ac -[NSKeyedUnarchiver
_decodeArrayOfObjectsForKey:] + 0x29c
46 com.apple.Foundation 0x90a06070 -[NSArray initWithCoder:] + 0x170
47 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
48 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
49 com.apple.AppKit 0x92e64898 -[NSIBObjectData initWithCoder:] +
0xcc
50 com.apple.Foundation 0x909f78c8 _decodeObjectBinary + 0x6f0
51 com.apple.Foundation 0x909fb22c _decodeObject + 0x98
52 com.apple.AppKit 0x92ee42a4 loadNib + 0xa8
53 com.apple.AppKit 0x92e3b55c +[NSBundle(NSNibLoading)
_loadNibFile:nameTable:withZone:ownerBundle:] + 0x2e8
54 com.apple.AppKit 0x92eba3f4 +[NSBundle(NSNibLoading)
loadNibFile:externalNameTable:withZone:] + 0x9c
55 com.apple.AppKit 0x92ecbbe8 +[NSBundle(NSNibLoading)
loadNibNamed:owner:] + 0x174
56 com.apple.AppKit 0x92eba25c NSApplicationMain + 0x174
57 com.wbc.castaway 0x00002554 _start + 0x158 (crt.c:272)
58 com.wbc.castaway 0x000023f8 start + 0x3c

Thread 1:
0 libSystem.B.dylib 0x900074c8 mach_msg_trap + 0x8
1 libSystem.B.dylib 0x90007018 mach_msg + 0x38
2 com.unsanity.ape 0xc000a954 __ape_internal + 0x90b8
3 com.unsanity.ape 0xc0001328 __ape_agent + 0x40
4 libSystem.B.dylib 0x900246e8 _pthread_body + 0x28

PPC Thread State:
srr0: 0x90a5c740 srr1: 0x0002f030 vrsave: 0x00000000
cr: 0x24000422 xer: 0x00000004 lr: 0x90a5c718 ctr: 0x9000a6c0
r0: 0x00000000 r1: 0xbfffd2a0 r2: 0xa09f04bc r3: 0xbfffce40
r4: 0x40000000 r5: 0x00000000 r6: 0xbfffcf80 r7: 0x00000004
r8: 0x00000003 r9: 0x00152e20 r10: 0x00000b0f r11: 0x24000422
r12: 0x9000a6c0 r13: 0x00000000 r14: 0x00000000 r15: 0xa2df47cc
r16: 0x0010e5b0 r17: 0xa2dfb274 r18: 0x00000000 r19: 0xa2dfb274
r20: 0xa09f71e8 r21: 0x00000177 r22: 0x00000000 r23: 0x00157bd0
r24: 0x00000000 r25: 0x00004284 r26: 0x00158770 r27: 0xa0a01b48
r28: 0x00000000 r29: 0xa09f5538 r30: 0x00000000 r31: 0x90a5c650

Binary Images Description:
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0xc7000 - 0xe3fff com.unsanity.windowshadex.cocoa WindowShade X Cocoa
Bits version 3.1 (3.1) /Users/deege/Library/Application
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Bits.ape/Contents/MacOS/WindowShade X Cocoa Bits
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WoodenBrain · July 18, 2005, 3:02pm

With jon’s help, I determined that the problem was the use of the date picker, which is tiger only.

You’d think that apple would have built in ignores for objects it doesn’t know about, so apps won’t simply crash.

anyway, to answer part of my original question, you can do a compatibility check in interface builder, that’s a good first start.

now my issue is whether it is possible to:

a) create a date picker on the fly (see dynamic object thread)

or

b) load a different nib file depending on the system version (ie that would involve no nib loading until the script says to load one)

jonn8 · July 18, 2005, 5:33pm

Yes, you need to take the main window out of the MainMenu.nib (you still need this nib for the menu, of course). The easiest way to do this is to open the MainMenu.nib and do a save as. Call the new nib MainWindow104.nib and make sure it is added to your project. In this new nib, remove the main menu and any other window or object other than the main window that may be in the nib. Save this nib. Now, with this nib, do another save as and call it MainWindow103.nib and, again, add it to your project. In this nib, delete the NSDatePicker and any other object that isn’t 10.3.x compatible. Save and close. Finally, open the original MainMenu.nib again and remove the main window object. Save and close.

Now you should have three nibs: MainMenu.nib which includes your main menu and other common windows such as a custom about window, etc.; MainWindow104.nib which just includes the main window including 10.4-only objects; and MainWindow103.nib that contains the same main window without any incompatible objects. In your code, early on, say in the “will finish launching” handler, check for the system version and then load the appropriate nib:

on will finish launching the_object
	set MacOS_version to (my gestalt_version_info("sysv", 4))
	if MacOS_version < "10.4" then
		load nib "MainWindow103"
	else
		load nib "MainWindow104"
	end if
end will finish launching

on gestalt_version_info(gestalt_code, string_length)
	try
		set {gc1, gc2, gc3, gc4} to (my num_to_hex((system attribute gestalt_code), string_length))
		if gc1 = "0" then set a to ""
		return ("" & {gc1, gc2, ".", gc3, ".", gc4}) as Unicode text
	on error
		return "unknown"
	end try
end gestalt_version_info

on num_to_hex(hex_data, string_length)
	set hex_string to {}
	repeat with i from string_length to 1 by -1
		set hex_string to ((hex_data mod 16) as Unicode text) & hex_string
		set hex_data to hex_data div 16
	end repeat
	return "" & hex_string
end num_to_hex

Jon

WoodenBrain · July 18, 2005, 6:16pm

thanks jon,

i continue (resolve?) this on this other thread:

http://bbs.applescript.net/viewtopic.php?id=13454