Xcode 10.3 does not work on MacOS Big Sur 11.0.1 (non beta)

Question

I have tried to format my MacOS, redownload Xcode 10.3. It just doesnt work.

Logs:

Process:               Xcode [22467]
Path:                  /Users/USER/Downloads/Xcode_10.3.app/Contents/MacOS/Xcode
Identifier:            com.apple.dt.Xcode
Version:               10.3 (14492.2)
Build Info:            IDEFrameworks-14492002000000000~2 (10G8)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           Xcode [22467]
User ID:               501

PlugIn Path:             /Users/USER/Downloads/Xcode_10.3.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
PlugIn Identifier:       libMainThreadChecker.dylib
PlugIn Version:          ??? (64492.1)

Date/Time:             2020-11-13 16:52:33.909 +0800
OS Version:            macOS 11.0.1 (20B29)
Report Version:        12
Bridge OS Version:     3.0 (14Y908)
Anonymous UUID:        46BBB97A-6E02-4B36-B8CE-640575A752F0


Time Awake Since Boot: 4500 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGBUS)
Exception Codes:       KERN_PROTECTION_FAILURE at 0x00007fff2379c9b9
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Bus error: 10
Termination Reason:    Namespace SIGNAL, Code 0xa
Terminating Process:   exc handler [22467]

VM Regions Near 0x7fff2379c9b9:
    __TEXT                   7fff22c03000-7fff23600000 [ 10.0M] r-x/r-x SM=COW  /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
--> __TEXT                   7fff23600000-7fff23800000 [ 2048K] r-x/rwx SM=PRV  /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
    Submap                   7fff23800000-7fff40000000 [456.0M] r--/rwx SM=PRV  process-only VM submap

Application Specific Information:
/Users/junjie/Downloads/Xcode_10.3.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
ProductBuildVersion: 10G8

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libMainThreadChecker.dylib      0x00000001176b8069 swizzleImplementationFast + 115
1   libMainThreadChecker.dylib      0x00000001176b7ef0 addSwizzler + 165
2   libMainThreadChecker.dylib      0x00000001176b7aec __library_initializer + 2937
3   dyld                            0x0000000117b21df5 ImageLoaderMachO::doImageInit(ImageLoader::LinkContext const&) + 321
4   dyld                            0x0000000117b2246d ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 

Any suggestion or idea how to resolve this?

Answer 1

Ok I managed to get it up and running by deleting ~/Downloads/Xcode_10.3.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib It compiles my project.

To be safe, I have copied this same dylib file from latest Xcode 12.2 and put into that folder. It is still working so far.

Answer 2

I had the same problem, I initially solved it using defaults write com.apple.dt.Xcode DVTDisableMainThreadChecker 1. After this, Xcode 10 seemed to work on macOS 11, and everything would build from within Xcode.

I then had the weirdest issue - when compiling from the command line using xcodebuild, the whole machine would grind to a halt and eventually hang, requiring a "hold down the power button" restart. The problem turned out to be that ibtool (used for compiling IB files) was not honouring DVTDisableMainThreadChecker, and was still crashing. This was somehow causing the machine to get into a state where it stopped responding.

The solution was to copy libMainThreadChecker.dylib from Xcode 12 into the Xcode 10 package. After that the problem went away.