[llvm-bugs] [Bug 34956] New: -DLLVM_REVERSE_ITERATION:BOOL=ON in stage2 produces file comparison failures with stage3

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34956

            Bug ID: 34956
           Summary: -DLLVM_REVERSE_ITERATION:BOOL=ON in stage2 produces
                    file comparison failures with stage3
           Product: new-bugs
           Version: trunk
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: howarth.mailing.lists at gmail.com
                CC: llvm-bugs at lists.llvm.org

When building a stage2 compiler from llvm trunk using
-DLLVM_REVERSE_ITERATION:BOOL=ON and then a stage3 compiler with
-DLLVM_REVERSE_ITERATION:BOOL=OFF, the stage2/stage3 object file comparison
produces many failures.

UNRESOLVED DIFFS (stage2 vs. stage3):
  include/llvm/Config/abi-breaking.h
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/AliasAnalysis.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/AssumptionCache.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/BasicAliasAnalysis.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/BlockFrequencyInfo.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/BlockFrequencyInfoImpl.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/BranchProbabilityInfo.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/CFG.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/CFLAndersAliasAnalysis.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/CFLSteensAliasAnalysis.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/CGSCCPassManager.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/CallGraphSCCPass.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/CaptureTracking.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/CodeMetrics.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/ConstantFolding.cpp.o
  lib/Analysis/CMakeFiles/LLVMAnalysis.dir/DemandedBits.cpp.o
...

This behavior is very reproducible but only when
-DLLVM_REVERSE_ITERATION:BOOL=ON is involved in the stage2 build.

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