-Cprofile-use cannot find file depending on RUSTFLAGS order #128476
Description
I tried this code:
RUSTFLAGS="-Cprofile-use=$ABS_PATH -Cllvm-args=-pgo-warn-missing-function -Ctarget-cpu=native -Ztune-cpu=native -Clink-arg=-fuse-ld=lld -Zthreads=4 -Ccodegen-units=1 -Cpanic=abort -Clto=fat" cargo build --release --target=<target> and I get
process didn't exit successfully: `<path>\bin\rustc.exe - --crate-name ___ --print=file-names -Cprofile-use=<abs_path> -Cllvm-args=-pgo-warn-missing-function -Ctarget-cpu=native -Ztune-cpu=native -Clink-arg=-fuse-ld=lld -Zthreads=4 -Ccodegen-units=1 -Cpanic=abort -Clto=fat --target <target> --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg` (exit code: 1) <snip> --- stderr error: file `<abs_path>` passed to `-C profile-use` does not exist If I instead change the order of RUSTFLAGS, putting the PGO stuff at the end:
RUSTFLAGS="-Ctarget-cpu=native -Ztune-cpu=native -Clink-arg=-fuse-ld=lld -Zthreads=4 -Ccodegen-units=1 -Cpanic=abort -Clto=fat -Cprofile-use=<abs_path> -Cllvm-args=-pgo-warn-missing-function" compilation succeeds
I have verified that the file exists. Both the path I provided and the path reported by the error. I even verified with Path::new(abs_path).exists()
I apologize that I couldn't find a more minimal example.
Meta
rustc --version --verbose:
rustc 1.82.0-nightly (f8060d282 2024-07-30) binary: rustc commit-hash: f8060d282d42770fadd73905e3eefb85660d3278 commit-date: 2024-07-30 host: x86_64-pc-windows-msvc release: 1.82.0-nightly LLVM version: 18.1.7