Ninja and shake different behavior

[stelleg]

Haven't figured out yet if this is a Ninja issue or a shake issue, but I thought it was at least worth reporting as they differ in behavior. When attempting to use shake to build LLVM 14.0.4, I'm getting what appears to be a circular dependency:

Invariant broken in &?>, not equalValue for all arguments (after normalisation).
Input1:
  bin/llvm-locstats
Output1:
  bin/llvm-locstats

Ninja builds without such an error. Going to see if I can debug the issue using shake's internal Ninja tools.

Issue occurs with the following versions:

✔ shake --version
Shake build system, version 0.19.5
✔ ninja --version
1.11.0
✔ cmake --version
cmake version 3.23.2