Emit optimization remarks to the final binary, not the console

[tschuett]

Since #90833 rustc prints remarks with -Cremark to the console.

LLVM can include the remarks into the executable. Then you can read the remarks and analyze them.

https://llvm.org/docs/Remarks.html

I never managed to thread the flags through rustc.

[matthiaskrgr]

RUSTFLAGS="-C llvm-args=--pass-remarks=.* -Cdebuginfo=2" cargo build --release

does that work for you?

[tschuett]

It still pollutes my console.

[tschuett]

RUSTFLAGS="-C llvm-args=--pass-remarks-output=filename -Cdebuginfo=2" cargo build --release

This fails because rustc does not know about: pass-remarks-output

[Kobzol]

With #113040, remarks can now be outputted into a directory, in the same (YAML) format as clang outputs them.