[llvm-dev] stage2/stage3 file comparisons failures in trunk when stage2 uses -DLLVM_REVERSE_ITERATION:BOOL=ON

[Jack Howarth via llvm-dev]

The -DLLVM_REVERSE_ITERATION:BOOL=ON cmake option when used in stage2 of a
3-stage bootstrap of llvm/clang/compiler-rt/libc++/polly/openmp is
producing many file comparison failures between the stage2 and stage3
builds. I have opened...

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

to track this issue which doesn't exist in the llvm 5.0.0 release.
Interestingly, there doesn't seem to be any non-deterministism in the
3-stage bootstrap on x86_64-apple-darwin17 when
 -DLLVM_REVERSE_ITERATION:BOOL=ON isn't selectively used for the stage2
cmake command in the build. In that case, repeated 3-stage bootstraps don't
detect any stage2/stage3 file comparison failures. However, the use of
-DLLVM_REVERSE_ITERATION:BOOL=ON in stage2 reproducibly produces
stage2/stage3 file comparison failures.
         Jack
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