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Make parallel compilation features work with deterministic builds #19023
Description
Currently only parallel reference resolution is supported. (see #18998)
The following do not work and are automatically disabled for deterministic builds:
- Parallel ILX Gen
- Graph based type checking (dedicated issue: Make graph-based type-checking fully deterministic and do not auto-disable it in deterministic builds. #14734)
- Parallel Optimizations
According to comments #14390 (comment) The issue most probably lies in embedded PDB generation.
Name generation in CompilerGlobalState.fs does not play well with parallel compilation, too.
Activity
majocha commentedon Oct 23, 2025
I'll gather some relevant comments here: #14390 (comment)
majocha commentedon Oct 24, 2025
The saga of graph type checking determinism is scattered among many PRs that I wasn't paying much attention to at the time. I'm only getting up to speed now. It seems at some point it worked / almost worked? (#15003)
Also #14850
nojaf commentedon Jan 21, 2026
Hello @majocha, can this issue be closed or is there still something left?
majocha commentedon Jan 21, 2026
Yes, this is fully completed and can be closed.