[llvm-dev] LLVM 3.9.1 build race?

Wed Jan 25 02:41:41 PST 2017

Hi Folks,

I am building LLVM 3.9.1 using the Yocto build system for a cross build. The compiled bins/libs work totally fine on the target machine however there seems to be an intermittent race condition during the build which causes a build failure. On the failed builds I usually see things being linking/compiling twice e.g.

Linking CXX static library ../libLLVMSupport.a
cd build/NATIVE/lib/Support && /usr/bin/cmake -P CMakeFiles/LLVMSupport.dir/cmake_clean_target.cmake
cd build/NATIVE/lib/Support && /usr/bin/cmake -E cmake_link_script CMakeFiles/LLVMSupport.dir/link.txt --verbose=1
/usr/bin/ar qc ../libLLVMSupport.a  CMakeFiles/LLVMSupport.dir/APFloat.cpp.o CMakeFiles/LLVMSupport.dir/APInt.cpp.o CMakeFiles/LLVMSupport.dir/APSInt.cpp.o CMakeFiles/LLVMSupport.dir/ARMBuildAttrs.cpp.o CMakeFiles/LLVMSupport.dir/ARMWinEH.cpp.o CMakeFiles/LLVMSupport.dir/Allocator.cpp.o CMakeFiles/LLVMSupport.dir/BlockFrequency.cpp.o CMakeFiles/LLVMSupport.dir/BranchProbability.cpp.o CMakeFiles/LLVMSupport.dir/CachePruning.cpp.o CMakeFiles/LLVMSupport.dir/circular_raw_ostream.cpp.o CMakeFiles/LLVMSupport.dir/COM.cpp.o CMakeFiles/LLVMSupport.dir/CommandLine.cpp.o CMakeFiles/LLVMSupport.dir/Compression.cpp.o CMakeFiles/LLVMSupport.dir/ConvertUTF.c.o CMakeFiles/LLVMSupport.dir/ConvertUTFWrapper.cpp.o CMakeFiles/LLVMSupport.dir/CrashRecoveryContext.cpp.o CMakeFiles/LLVMSupport.dir/DataExtractor.cpp.o CMakeFiles/LLVMSupport.dir/DataStream.cpp.o CMakeFiles/LLVMSupport.dir/Debug.cpp.o CMakeFiles/LLVMSupport.dir/DeltaAlgorithm.cpp.o CMakeFiles/LLVMSupport.dir/DAGDeltaAlgorithm.cpp.o CMakeFiles/LLVMSupport.dir/Dwarf.cpp.o CMakeFiles/LLVMSupport.dir/Error.cpp.o CMakeFiles/LLVMSupport.dir/ErrorHandling.cpp.o CMakeFiles/LLVMSupport.dir/FileUtilities.cpp.o CMakeFiles/LLVMSupport.dir/FileOutputBuffer.cpp.o CMakeFiles/LLVMSupport.dir/FoldingSet.cpp.o CMakeFiles/LLVMSupport.dir/FormattedStream.cpp.o CMakeFiles/LLVMSupport.dir/GraphWriter.cpp.o CMakeFiles/LLVMSupport.dir/Hashing.cpp.o CMakeFiles/LLVMSupport.dir/IntEqClasses.cpp.o CMakeFiles/LLVMSupport.dir/IntervalMap.cpp.o CMakeFiles/LLVMSupport.dir/IntrusiveRefCntPtr.cpp.o CMakeFiles/LLVMSupport.dir/JamCRC.cpp.o CMakeFiles/LLVMSupport.dir/LEB128.cpp.o CMakeFiles/LLVMSupport.dir/LineIterator.cpp.o CMakeFiles/LLVMSupport.dir/Locale.cpp.o CMakeFiles/LLVMSupport.dir/LockFileManager.cpp.o CMakeFiles/LLVMSupport.dir/ManagedStatic.cpp.o CMakeFiles/LLVMSupport.dir/MathExtras.cpp.o CMakeFiles/LLVMSupport.dir/MemoryBuffer.cpp.o CMakeFiles/LLVMSupport.dir/MemoryObject.cpp.o CMakeFiles/LLVMSupport.dir/MD5.cpp.o CMakeFiles/LLVMSupport.dir/Options.cpp.o CMakeFiles/LLVMSupport.dir/PluginLoader.cpp.o CMakeFiles/LLVMSupport.dir/PrettyStackTrace.cpp.o CMakeFiles/LLVMSupport.dir/RandomNumberGenerator.cpp.o CMakeFiles/LLVMSupport.dir/Regex.cpp.o CMakeFiles/LLVMSupport.dir/ScaledNumber.cpp.o CMakeFiles/LLVMSupport.dir/ScopedPrinter.cpp.o CMakeFiles/LLVMSupport.dir/SHA1.cpp.o CMakeFiles/LLVMSupport.dir/SmallPtrSet.cpp.o CMakeFiles/LLVMSupport.dir/SmallVector.cpp.o CMakeFiles/LLVMSupport.dir/SourceMgr.cpp.o CMakeFiles/LLVMSupport.dir/SpecialCaseList.cpp.o CMakeFiles/LLVMSupport.dir/Statistic.cpp.o CMakeFiles/LLVMSupport.dir/StreamingMemoryObject.cpp.o CMakeFiles/LLVMSupport.dir/StringExtras.cpp.o CMakeFiles/LLVMSupport.dir/StringMap.cpp.o CMakeFiles/LLVMSupport.dir/StringPool.cpp.o CMakeFiles/LLVMSupport.dir/StringSaver.cpp.o CMakeFiles/LLVMSupport.dir/StringRef.cpp.o CMakeFiles/LLVMSupport.dir/SystemUtils.cpp.o CMakeFiles/LLVMSupport.dir/TargetParser.cpp.o CMakeFiles/LLVMSupport.dir/ThreadPool.cpp.o CMakeFiles/LLVMSupport.dir/Timer.cpp.o CMakeFiles/LLVMSupport.dir/ToolOutputFile.cpp.o CMakeFiles/LLVMSupport.dir/Triple.cpp.o CMakeFiles/LLVMSupport.dir/Twine.cpp.o CMakeFiles/LLVMSupport.dir/Unicode.cpp.o CMakeFiles/LLVMSupport.dir/YAMLParser.cpp.o CMakeFiles/LLVMSupport.dir/YAMLTraits.cpp.o CMakeFiles/LLVMSupport.dir/raw_os_ostream.cpp.o CMakeFiles/LLVMSupport.dir/raw_ostream.cpp.o CMakeFiles/LLVMSupport.dir/regcomp.c.o CMakeFiles/LLVMSupport.dir/regerror.c.o CMakeFiles/LLVMSupport.dir/regexec.c.o CMakeFiles/LLVMSupport.dir/regfree.c.o CMakeFiles/LLVMSupport.dir/regstrlcpy.c.o CMakeFiles/LLVMSupport.dir/Atomic.cpp.o CMakeFiles/LLVMSupport.dir/DynamicLibrary.cpp.o CMakeFiles/LLVMSupport.dir/Errno.cpp.o CMakeFiles/LLVMSupport.dir/Host.cpp.o CMakeFiles/LLVMSupport.dir/Memory.cpp.o CMakeFiles/LLVMSupport.dir/Mutex.cpp.o CMakeFiles/LLVMSupport.dir/Path.cpp.o CMakeFiles/LLVMSupport.dir/Process.cpp.o CMakeFiles/LLVMSupport.dir/Program.cpp.o CMakeFiles/LLVMSupport.dir/RWMutex.cpp.o CMakeFiles/LLVMSupport.dir/SearchForAddressOfSpecialSymbol.cpp.o CMakeFiles/LLVMSupport.dir/Signals.cpp.o CMakeFiles/LLVMSupport.dir/TargetRegistry.cpp.o CMakeFiles/LLVMSupport.dir/ThreadLocal.cpp.o CMakeFiles/LLVMSupport.dir/Threading.cpp.o CMakeFiles/LLVMSupport.dir/TimeValue.cpp.o CMakeFiles/LLVMSupport.dir/Valgrind.cpp.o CMakeFiles/LLVMSupport.dir/Watchdog.cpp.o
Linking CXX static library ../libLLVMSupport.a
cd build/NATIVE/lib/Support && /usr/bin/cmake -P CMakeFiles/LLVMSupport.dir/cmake_clean_target.cmake
cd build/NATIVE/lib/Support && /usr/bin/cmake -E cmake_link_script CMakeFiles/LLVMSupport.dir/link.txt --verbose=1
/usr/bin/ar qc ../libLLVMSupport.a  CMakeFiles/LLVMSupport.dir/APFloat.cpp.o CMakeFiles/LLVMSupport.dir/APInt.cpp.o CMakeFiles/LLVMSupport.dir/APSInt.cpp.o CMakeFiles/LLVMSupport.dir/ARMBuildAttrs.cpp.o CMakeFiles/LLVMSupport.dir/ARMWinEH.cpp.o CMakeFiles/LLVMSupport.dir/Allocator.cpp.o CMakeFiles/LLVMSupport.dir/BlockFrequency.cpp.o CMakeFiles/LLVMSupport.dir/BranchProbability.cpp.o CMakeFiles/LLVMSupport.dir/CachePruning.cpp.o CMakeFiles/LLVMSupport.dir/circular_raw_ostream.cpp.o CMakeFiles/LLVMSupport.dir/COM.cpp.o CMakeFiles/LLVMSupport.dir/CommandLine.cpp.o CMakeFiles/LLVMSupport.dir/Compression.cpp.o CMakeFiles/LLVMSupport.dir/ConvertUTF.c.o CMakeFiles/LLVMSupport.dir/ConvertUTFWrapper.cpp.o CMakeFiles/LLVMSupport.dir/CrashRecoveryContext.cpp.o CMakeFiles/LLVMSupport.dir/DataExtractor.cpp.o CMakeFiles/LLVMSupport.dir/DataStream.cpp.o CMakeFiles/LLVMSupport.dir/Debug.cpp.o CMakeFiles/LLVMSupport.dir/DeltaAlgorithm.cpp.o CMakeFiles/LLVMSupport.dir/DAGDeltaAlgorithm.cpp.o CMakeFiles/LLVMSupport.dir/Dwarf.cpp.o CMakeFiles/LLVMSupport.dir/Error.cpp.o CMakeFiles/LLVMSupport.dir/ErrorHandling.cpp.o CMakeFiles/LLVMSupport.dir/FileUtilities.cpp.o CMakeFiles/LLVMSupport.dir/FileOutputBuffer.cpp.o CMakeFiles/LLVMSupport.dir/FoldingSet.cpp.o CMakeFiles/LLVMSupport.dir/FormattedStream.cpp.o CMakeFiles/LLVMSupport.dir/GraphWriter.cpp.o CMakeFiles/LLVMSupport.dir/Hashing.cpp.o CMakeFiles/LLVMSupport.dir/IntEqClasses.cpp.o CMakeFiles/LLVMSupport.dir/IntervalMap.cpp.o CMakeFiles/LLVMSupport.dir/IntrusiveRefCntPtr.cpp.o CMakeFiles/LLVMSupport.dir/JamCRC.cpp.o CMakeFiles/LLVMSupport.dir/LEB128.cpp.o CMakeFiles/LLVMSupport.dir/LineIterator.cpp.o CMakeFiles/LLVMSupport.dir/Locale.cpp.o CMakeFiles/LLVMSupport.dir/LockFileManager.cpp.o CMakeFiles/LLVMSupport.dir/ManagedStatic.cpp.o CMakeFiles/LLVMSupport.dir/MathExtras.cpp.o CMakeFiles/LLVMSupport.dir/MemoryBuffer.cpp.o CMakeFiles/LLVMSupport.dir/MemoryObject.cpp.o CMakeFiles/LLVMSupport.dir/MD5.cpp.o CMakeFiles/LLVMSupport.dir/Options.cpp.o CMakeFiles/LLVMSupport.dir/PluginLoader.cpp.o CMakeFiles/LLVMSupport.dir/PrettyStackTrace.cpp.o CMakeFiles/LLVMSupport.dir/RandomNumberGenerator.cpp.o CMakeFiles/LLVMSupport.dir/Regex.cpp.o CMakeFiles/LLVMSupport.dir/ScaledNumber.cpp.o CMakeFiles/LLVMSupport.dir/ScopedPrinter.cpp.o CMakeFiles/LLVMSupport.dir/SHA1.cpp.o CMakeFiles/LLVMSupport.dir/SmallPtrSet.cpp.o CMakeFiles/LLVMSupport.dir/SmallVector.cpp.o CMakeFiles/LLVMSupport.dir/SourceMgr.cpp.o CMakeFiles/LLVMSupport.dir/SpecialCaseList.cpp.o CMakeFiles/LLVMSupport.dir/Statistic.cpp.o CMakeFiles/LLVMSupport.dir/StreamingMemoryObject.cpp.o CMakeFiles/LLVMSupport.dir/StringExtras.cpp.o CMakeFiles/LLVMSupport.dir/StringMap.cpp.o CMakeFiles/LLVMSupport.dir/StringPool.cpp.o CMakeFiles/LLVMSupport.dir/StringSaver.cpp.o CMakeFiles/LLVMSupport.dir/StringRef.cpp.o CMakeFiles/LLVMSupport.dir/SystemUtils.cpp.o CMakeFiles/LLVMSupport.dir/TargetParser.cpp.o CMakeFiles/LLVMSupport.dir/ThreadPool.cpp.o CMakeFiles/LLVMSupport.dir/Timer.cpp.o CMakeFiles/LLVMSupport.dir/ToolOutputFile.cpp.o CMakeFiles/LLVMSupport.dir/Triple.cpp.o CMakeFiles/LLVMSupport.dir/Twine.cpp.o CMakeFiles/LLVMSupport.dir/Unicode.cpp.o CMakeFiles/LLVMSupport.dir/YAMLParser.cpp.o CMakeFiles/LLVMSupport.dir/YAMLTraits.cpp.o CMakeFiles/LLVMSupport.dir/raw_os_ostream.cpp.o CMakeFiles/LLVMSupport.dir/raw_ostream.cpp.o CMakeFiles/LLVMSupport.dir/regcomp.c.o CMakeFiles/LLVMSupport.dir/regerror.c.o CMakeFiles/LLVMSupport.dir/regexec.c.o CMakeFiles/LLVMSupport.dir/regfree.c.o CMakeFiles/LLVMSupport.dir/regstrlcpy.c.o CMakeFiles/LLVMSupport.dir/Atomic.cpp.o CMakeFiles/LLVMSupport.dir/DynamicLibrary.cpp.o CMakeFiles/LLVMSupport.dir/Errno.cpp.o CMakeFiles/LLVMSupport.dir/Host.cpp.o CMakeFiles/LLVMSupport.dir/Memory.cpp.o CMakeFiles/LLVMSupport.dir/Mutex.cpp.o CMakeFiles/LLVMSupport.dir/Path.cpp.o CMakeFiles/LLVMSupport.dir/Process.cpp.o CMakeFiles/LLVMSupport.dir/Program.cpp.o CMakeFiles/LLVMSupport.dir/RWMutex.cpp.o CMakeFiles/LLVMSupport.dir/SearchForAddressOfSpecialSymbol.cpp.o CMakeFiles/LLVMSupport.dir/Signals.cpp.o CMakeFiles/LLVMSupport.dir/TargetRegistry.cpp.o CMakeFiles/LLVMSupport.dir/ThreadLocal.cpp.o CMakeFiles/LLVMSupport.dir/Threading.cpp.o CMakeFiles/LLVMSupport.dir/TimeValue.cpp.o CMakeFiles/LLVMSupport.dir/Valgrind.cpp.o CMakeFiles/LLVMSupport.dir/Watchdog.cpp.o
/usr/bin/ranlib ../libLLVMSupport.a
/usr/bin/ranlib ../libLLVMSupport.a

Sorry for the clutter here... :(

and from the above mentioned example the build failed with

../../lib/libLLVMSupport.a(Process.cpp.o): In function `llvm::sys::Process::GetRandomNumber()':
Process.cpp:(.text._ZN4llvm3sys7Process15GetRandomNumberEv+0x70): undefined reference to `llvm::sys::TimeValue::now()'
collect2: error: ld returned 1 exit status

I also see exactly 4 instances of "warning: jobserver unavailable: using -j1.  Add `+' to parent make rule." and this was reported at https://llvm.org/bugs/show_bug.cgi?format=multiple&id=23328 quite some time ago. Has there been any movement on this? Can the mentioned warning cause such a trouble? I doubt that because the warning appears in successful builds as well but I'd love to hear expert opinion on this.

NATIVE builds are done for the host which is then utilized for generating the target binaries, correct? If that is so, what can cause multiple builds for the NATIVE system?

We're building with CMake with the "Unix Makefiles" generator prior to this we were building 3.7.1 using autotools and never saw such an issue. GCC version is 5.4.0 on both instances with GNU Make at 4.1. Any pointers/help would be highly appreciated.

BR,
Awais
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