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| -rwxr-xr-x | src/ci/pgo.sh | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/ci/pgo.sh b/src/ci/pgo.sh index 13b8ca91f89..a5f47ca78ff 100755 --- a/src/ci/pgo.sh +++ b/src/ci/pgo.sh @@ -24,6 +24,20 @@ pgo_perf_benchmark ctfe-stress-4 cp -pri ../src/tools/cargo /tmp/cargo +# The Cargo repository does not have a Cargo.lock in it, as it relies on the +# lockfile already present in the rust-lang/rust monorepo. This decision breaks +# down when Cargo is built outside the monorepo though (like in this case), +# resulting in a build without any dependency locking. +# +# To ensure Cargo is built with locked dependencies even during PGO profiling +# the following command copies the monorepo's lockfile into the Cargo temporary +# directory. Cargo will *not* keep that lockfile intact, as it will remove all +# the dependencies Cargo itself doesn't rely on. Still, it will prevent +# building Cargo with arbitrary dependency versions. +# +# See #81378 for the bug that prompted adding this. +cp -p ../Cargo.lock /tmp/cargo + # Build cargo (with some flags) function pgo_cargo { RUSTC=./build/$PGO_HOST/stage2/bin/rustc \ |