Re: clang under debian broken when compiling libobjc2

[Andreas Fink]

its not that clang crashed while compiling. Its the binary it produced which crashes.
This shows up when you do a simple "make test" after compiling libobjc2.

Attached is a console output of my test system once with CC=clang (which is clang-11) and once with CC=clang-16
As you can see all tests pass with clang-11 and with clang-16, more than half are failing

57% tests passed, 86 tests failed out of 198

Total Test time (real) =  12.16 sec

The following tests FAILED:
      1 - alias (SEGFAULT)
      2 - alias_optimised (SEGFAULT)
      5 - alignTest (SEGFAULT)
      6 - alignTest_optimised (SEGFAULT)
      9 - AllocatePair (SEGFAULT)
     10 - AllocatePair_optimised (SEGFAULT)
     13 - ARCTest_arc (SEGFAULT)
     14 - ARCTest_arc_optimised (SEGFAULT)
     17 - AssociatedObject (SEGFAULT)
     18 - AssociatedObject_optimised (SEGFAULT)
     21 - AssociatedObject2 (SEGFAULT)
     22 - AssociatedObject2_optimised (SEGFAULT)
     25 - BlockImpTest (SEGFAULT)
     26 - BlockImpTest_optimised (SEGFAULT)
     33 - ConstantString (SEGFAULT)
     34 - ConstantString_optimised (SEGFAULT)
     37 - Category (SEGFAULT)
     38 - Category_optimised (SEGFAULT)
     41 - ExceptionTest (SEGFAULT)
     42 - ExceptionTest_optimised (SEGFAULT)
     45 - FastARC (SEGFAULT)
     46 - FastARC_optimised (SEGFAULT)
     49 - FastARCPool (SEGFAULT)
     50 - FastARCPool_optimised (SEGFAULT)
     53 - FastRefCount (SEGFAULT)
     54 - FastRefCount_optimised (SEGFAULT)
     57 - Forward (SEGFAULT)
     58 - Forward_optimised (SEGFAULT)
     61 - ManyManySelectors (SEGFAULT)
     62 - ManyManySelectors_optimised (SEGFAULT)
     65 - NestedExceptions (SEGFAULT)
     66 - NestedExceptions_optimised (SEGFAULT)
     69 - PropertyAttributeTest (SEGFAULT)
     70 - PropertyAttributeTest_optimised (SEGFAULT)
     81 - PropertyIntrospectionTest2_arc (Subprocess aborted)
     82 - PropertyIntrospectionTest2_arc_optimised (Subprocess aborted)
     85 - ProtocolCreation (Subprocess aborted)
     86 - ProtocolCreation_optimised (Subprocess aborted)
     89 - ResurrectInDealloc_arc (SEGFAULT)
     90 - ResurrectInDealloc_arc_optimised (SEGFAULT)
     93 - RuntimeTest (SEGFAULT)
     94 - RuntimeTest_optimised (SEGFAULT)
     97 - SuperMethodMissing (SEGFAULT)
     98 - SuperMethodMissing_optimised (SEGFAULT)
    105 - WeakRefLoad (SEGFAULT)
    106 - WeakRefLoad_optimised (SEGFAULT)
    109 - WeakReferences_arc (SEGFAULT)
    110 - WeakReferences_arc_optimised (SEGFAULT)
    117 - ivar_arc (SEGFAULT)
    118 - ivar_arc_optimised (SEGFAULT)
    121 - ivar_atomic (SEGFAULT)
    122 - ivar_atomic_optimised (SEGFAULT)
    125 - IVarOverlap (SEGFAULT)
    126 - IVarOverlap_optimised (SEGFAULT)
    129 - IVarSuperclassOverlap (Subprocess aborted)
    130 - IVarSuperclassOverlap_optimised (Subprocess aborted)
    133 - objc_msgSend (Subprocess aborted)
    134 - objc_msgSend_optimised (Subprocess aborted)
    141 - NilException (Subprocess aborted)
    142 - NilException_optimised (Subprocess aborted)
    145 - MethodArguments (Subprocess aborted)
    146 - MethodArguments_optimised (Subprocess aborted)
    149 - zeroSizedIVar (Subprocess aborted)
    150 - zeroSizedIVar_optimised (Subprocess aborted)
    153 - exchange (SEGFAULT)
    154 - exchange_optimised (SEGFAULT)
    165 - setSuperclass (SEGFAULT)
    166 - setSuperclass_optimised (SEGFAULT)
    169 - BoxedForeignException (SEGFAULT)
    170 - BoxedForeignException_optimised (SEGFAULT)
    177 - category_properties (Subprocess aborted)
    178 - category_properties_optimised (Subprocess aborted)
    179 - CXXExceptions (SEGFAULT)
    180 - CXXExceptions_optimised (SEGFAULT)
    187 - ObjCXXEHInterop (SEGFAULT)
    188 - ObjCXXEHInterop_optimised (SEGFAULT)
    189 - ObjCXXEHInterop_legacy (SEGFAULT)
    190 - ObjCXXEHInterop_legacy_optimised (SEGFAULT)
    191 - ObjCXXEHInteropTwice (SEGFAULT)
    192 - ObjCXXEHInteropTwice_optimised (SEGFAULT)
    193 - ObjCXXEHInteropTwice_legacy (SEGFAULT)
    194 - ObjCXXEHInteropTwice_legacy_optimised (SEGFAULT)
    195 - ObjCXXEHInterop_arc (SEGFAULT)
    196 - ObjCXXEHInterop_arc_optimised (SEGFAULT)
    197 - ObjCXXEHInterop_arc_legacy (SEGFAULT)
    198 - ObjCXXEHInterop_arc_legacy_optimised (SEGFAULT)



Gregory Casamento wrote on 16.09.22 14:58:

Can you post the error?   Also clang will produce scripts and a sample bit of the code that failed.  It would be useful to post that to their bug tracker. 

On Fri, Sep 16, 2022 at 01:47 Andreas Fink <andreas@fink.org> wrote:

FYI,

The current clang-16 in the debian 10 repository does not work when
compiling libobjc2
Compiling works but most of the tests segfault

Changing to clang-11 everything works
clang-9 also works.

What has changed in the compiler that it breas Objc?

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LastTest.log
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