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Bad Arm7 code generation?
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Bad Arm7 code generation?

  • Subject: Bad Arm7 code generation?
  • From: Jean-Denis MUYS <email@hidden>
  • Date: Fri, 12 Aug 2011 12:31:25 +0000
  • Thread-topic: Bad Arm7 code generation?
I have an app that runs just fine on the simulator. However, it fails to build on the device, with a very  unhelpful error message:

Command /Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin/clang failed with exit code 1

"Unrolling" the build output reveals a bit more information:

/var/folders/sj/_9x5rtbj59bb6wqhgy_ydlxr0000gn/T/cc-jCp4JC.s:703:bad instruction `lock'
/var/folders/sj/_9x5rtbj59bb6wqhgy_ydlxr0000gn/T/cc-jCp4JC.s:704:bad instruction `xaddl r1,(r0)'
clang: error: assembler command failed with exit code 1 (use -v to see invocation)
Command /Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin/clang failed with exit code 1

So it seems the assembler phase of the llvm compiler was fed a corrupt source file. That source file was the output of the compiler:

/Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin/clang -x c++ -arch armv7 -miphoneos-version-min=4.3 -c /Development/KommerceiPadEtape3/$KLIB/Source/KRefCount.cpp -o $BUILD/Objects-normal/armv7/KRefCount.o

(where I have obviously omitted or shortened a number of argument de clang).

To really get to the assembly source file, I re-ran the compiler command line adding the -v option a suggested by Xcode. This led to an output that also included:

-coverage-file /var/folders/sj/_9x5rtbj59bb6wqhgy_ydlxr0000gn/T/cc-JuRpTO.s

(yes the intermediary files seem to change names each time).

In my mind (but who am I to trust my mind), if the compiler silently emitted bad assembly code, it can only be a compiler bug.

Did I miss something? Is there anything worth trying or investigating? Note that this is C++ source code.

Thanks a lot.

Jean-Denis

PS: I get the same behavior with Xcode 4.1.


For the sake of it, here is the full Xcode build output for that file:


CompileC /Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/Objects-normal/armv7/KRefCount.o KommerceiPadEtape3/KLib/Source/KRefCount.cpp normal armv7 c++ com.apple.compilers.llvm.clang.1_0.compiler
    cd /Development/KommerceiPadEtape3
    setenv LANG en_US.US-ASCII
    setenv PATH "/Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin:/Xcode4.2/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:/usr/X11/bin"
    /Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin/clang -x c++ -arch armv7 -fmessage-length=0 -fdiagnostics-print-source-range-info -fdiagnostics-show-category=id -fdiagnostics-parseable-fixits -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wparentheses -Wswitch -Wno-unused-parameter -Wunused-variable -Wunused-value -Wno-shorten-64-to-32 -Wc++0x-extensions -DDEBUG -isysroot /Xcode4.2/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -gdwarf-2 -fvisibility-inlines-hidden -Wno-sign-conversion -mthumb -miphoneos-version-min=4.3 -iquote /Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/KommerceiPadEtape3-generated-files.hmap -I/Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/KommerceiPadEtape3-own-target-headers.hmap -I/Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/KommerceiPadEtape3-all-target-headers.hmap -iquote /Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/KommerceiPadEtape3-project-headers.hmap -I/Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Products/Debug-iphoneos/include -IKommerceiPadEtape3/KLib -IKommerceiPadEtape3/KLib/Include -IKommerceiPadEtape3/KLib/Source -IKommerceiPadEtape3/KLib/Include/Db -IKommerceiPadEtape3/KLib/Include/gdiplus -IKommerceiPadEtape3/KLib/Include/Kdb -IKommerceiPadEtape3/KLib/Include/Record -IKommerceiPadEtape3/KLib/Include/Rep -IKommerceiPadEtape3/KLib/Include/Shared -IKommerceiPadEtape3/KLib/Include/SystemRecord -IKommerceiPadEtape3/KLib/Include/SystemTable -IKommerceiPadEtape3/KLib/Include/Table -IKommerceiPadEtape3/KLib/Source/Db -IKommerceiPadEtape3/KLib/Source/Kdb -IKommerceiPadEtape3/KLib/Source/Record -IKommerceiPadEtape3/KLib/Source/Rep -IKommerceiPadEtape3/KLib/Source/SystemRecord -IKommerceiPadEtape3/KLib/Source/SystemTable -IKommerceiPadEtape3/KLib/Source/Table -IKommerceiPadEtape3/KLib/Source/Kdb/Sqlite -IKommerceiPadEtape3/WinLib -IKommerceiPadEtape3/WinLib/GDIPlus -IKommerceiPadEtape3/KLib/include -IKommerceiPadEtape3/KLib/include/Db -IKommerceiPadEtape3/KLib/include/gdiplus -IKommerceiPadEtape3/KLib/include/Kdb -IKommerceiPadEtape3/KLib/include/Record -IKommerceiPadEtape3/KLib/include/Rep -IKommerceiPadEtape3/KLib/include/Shared -IKommerceiPadEtape3/KLib/include/SystemRecord -IKommerceiPadEtape3/KLib/include/SystemTable -IKommerceiPadEtape3/KLib/include/Table -IKommerceiPadEtape3/KLib/include/Kdb -I/Xcode4.2/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/include -I/Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/DerivedSources/armv7 -I/Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/DerivedSources -F/Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Products/Debug-iphoneos -include /Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/PrecompiledHeaders/KommerceiPadEtape3-Prefix-afsgtmyrzqzjgaawplimihusetwu/KommerceiPadEtape3-Prefix.pch -MMD -MT dependencies -MF /Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/Objects-normal/armv7/KRefCount.d -c /Development/KommerceiPadEtape3/KommerceiPadEtape3/KLib/Source/KRefCount.cpp -o /Users/jdmuys/Library/Developer/Xcode/DerivedData/KommerceiPadEtape3-bhkgahdowrrdyefpoornbknjvapf/Build/Intermediates/KommerceiPadEtape3.build/Debug-iphoneos/KommerceiPadEtape3.build/Objects-normal/armv7/KRefCount.o

/var/folders/sj/_9x5rtbj59bb6wqhgy_ydlxr0000gn/T/cc-jCp4JC.s:703:bad instruction `lock'
/var/folders/sj/_9x5rtbj59bb6wqhgy_ydlxr0000gn/T/cc-jCp4JC.s:704:bad instruction `xaddl r1,(r0)'
clang: error: assembler command failed with exit code 1 (use -v to see invocation)
Command /Xcode4.2/Platforms/iPhoneOS.platform/Developer/usr/bin/clang failed with exit code 1


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