7 python2.7 ../x.py build --target=$PGO_HOST --host=$PGO_HOST \
8 --stage 2 library/std --rust-profile-generate=/tmp/rustc-pgo
10 ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 \
11 --crate-type=lib ../library/core/src/lib.rs
13 # Download and build a single-file stress test benchmark on perf.rust-lang.org.
14 function pgo_perf_benchmark {
15 local PERF=e095f5021bf01cf3800f50b3a9f14a9683eb3e4e
16 local github_prefix=https://raw.githubusercontent.com/rust-lang/rustc-perf/$PERF
18 curl -o /tmp/$name.rs $github_prefix/collector/benchmarks/$name/src/lib.rs
19 ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 --crate-type=lib /tmp/$name.rs
22 pgo_perf_benchmark externs
23 pgo_perf_benchmark ctfe-stress-4
25 cp -pri ../src/tools/cargo /tmp/cargo
27 # The Cargo repository does not have a Cargo.lock in it, as it relies on the
28 # lockfile already present in the rust-lang/rust monorepo. This decision breaks
29 # down when Cargo is built outside the monorepo though (like in this case),
30 # resulting in a build without any dependency locking.
32 # To ensure Cargo is built with locked dependencies even during PGO profiling
33 # the following command copies the monorepo's lockfile into the Cargo temporary
34 # directory. Cargo will *not* keep that lockfile intact, as it will remove all
35 # the dependencies Cargo itself doesn't rely on. Still, it will prevent
36 # building Cargo with arbitrary dependency versions.
38 # See #81378 for the bug that prompted adding this.
39 cp -p ../Cargo.lock /tmp/cargo
41 # Build cargo (with some flags)
43 RUSTC=./build/$PGO_HOST/stage2/bin/rustc \
44 ./build/$PGO_HOST/stage0/bin/cargo $@ \
45 --manifest-path /tmp/cargo/Cargo.toml
48 # Build a couple different variants of Cargo
49 CARGO_INCREMENTAL=1 pgo_cargo check
50 echo 'pub fn barbarbar() {}' >> /tmp/cargo/src/cargo/lib.rs
51 CARGO_INCREMENTAL=1 pgo_cargo check
52 touch /tmp/cargo/src/cargo/lib.rs
53 CARGO_INCREMENTAL=1 pgo_cargo check
54 pgo_cargo build --release
56 # Merge the profile data we gathered
57 ./build/$PGO_HOST/llvm/bin/llvm-profdata \
58 merge -o /tmp/rustc-pgo.profdata /tmp/rustc-pgo
60 # This produces the actual final set of artifacts.
61 $@ --rust-profile-use=/tmp/rustc-pgo.profdata