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| author | fanquake <fanquake@gmail.com> | 2020-11-24 20:16:56 +0800 |
|---|---|---|
| committer | fanquake <fanquake@gmail.com> | 2020-11-24 21:12:02 +0800 |
| commit | 31c9987976af8ac5ad40091256ac41a2ccb078cd (patch) | |
| tree | bc47c856ba18bf8ec65627487687d07759670e29 /src/Makefile.am | |
| parent | 9402159b9bfade4417ee32721ab0d8c877aac9c6 (diff) | |
| parent | 8f7d1b39efbe65ab2747c593cc3560d4a449a333 (diff) | |
Merge #20447: depends: Patch qt_intersect_spans to avoid non-deterministic behavior in LLVM 8
8f7d1b39efbe65ab2747c593cc3560d4a449a333 Fix QPainter non-determinism on macOS (Andrew Chow)
Pull request description:
Aplies a patch to Qt that fixes the non-determinism by modifying Qt. The source of the non-determinism is how LLVM 8 optimizes qt_intersect_spans when compiling. The particular optimization that seems to be causing the problems is that a temp variable is being added for spans->y. For some reason, when it does this, it chooses different instructions to use when making that variable. We bypass this problem by patching qt_intersect_spans to always make and use this local variable.
Potential alternative to #20436 and #20440
ACKs for top commit:
hebasto:
re-ACK 8f7d1b39efbe65ab2747c593cc3560d4a449a333 ~for merging into the 0.21 branch, but [not into the master](https://github.com/bitcoin/bitcoin/pull/20454) branch.~
fanquake:
ACK 8f7d1b39efbe65ab2747c593cc3560d4a449a333
Tree-SHA512: b0d00a77643554021736524fb64611462ef2ec849a220543c12d99edb0f52f2e8128d2cc61fa82176b7e13b294574774a92d6b649badf8b7630c6d6a7e70ce10
Diffstat (limited to 'src/Makefile.am')
0 files changed, 0 insertions, 0 deletions