tree e0cbafe42774739bcfb5ce2749bf2aa181a790b8
parent a94e56095808f4784afcf8e50819ba594c5e8219
author Martin Storsjö <martin@martin.st> 1746446787 +0300
committer GitHub <noreply@github.com> 1746446787 +0300
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[DWARFLinkerParallel] Fix incorrect uses of compare_exchange_weak (#138129)

The documentation for compare_exchange_weak says that it is allowed to
spuriously fail. If compare_exchange_weak is called in a loop, spurious
failures usually are benign - but in these cases, a spurious failure
would give incorrect behaviour.

E.g. in TypePool::getOrCreateTypeEntryBody, we assume that if the
compare_exchange call returned false, we had been preempted by another
thread and that DIE is non-null.

This fixes running the dsymutil tests on Windows on aarch64 (built with
a mingw toolchain with libc++).