pgo: -Cprofile-use can't find file #63609
Description
git clone https://github.com/matthiaskrgr/cargo-cache cd cargo-cache RUSTFLAGS="-Cprofile-generate=target/pgodata" cargo build --release ./target/release/cargo-cache ./target/release/cargo-cache ./target/release/cargo-cache q hello ./target/release/cargo-cache r ./target/release/cargo-cache --top-cache-items 10 llvm-profdata merge -o target/merged.profdata ./target/pgodata/ file target/merged.profdata # target/merged.profdata: LLVM indexed profile data, version 5 RUSTFLAGS="-Cprofile-use=target/merged.profdata" cargo build --release -j 1 Compiling serde v1.0.98 error: File `target/merged.profdata` passed to `-C profile-use` does not exist. error: aborting due to previous error error: Could not compile `serde`. To learn more, run the command again with --verbose. The file is definitely there, but for some reason it is not found??
rustc 1.38.0-nightly (c43d03a19 2019-08-14)