RFC 3127: path sanitisation changes

[pnkfelix]

Meeting proposal info

• Title: Discuss RFC 3127
• Type: technical

Summary

Discuss https://github.com/rust-lang/rfcs/pull/3127

From https://github.com/rust-lang/rfcs/pull/3127#issuecomment-1112754808 :

A summary of recent changes:

1. Instead of letting Cargo decide whether or not to sanitise debuginfo based on -C split-debuginfo setting (which necessitated Cargo feeding different arguments to rustc depending on that codegen option), explicit scopes unsplit-debuginfo and split-debuginfo are now created to target only embedded and split debuginfo respectively. unsplit-debuginfo does nothing when the debuginfo is split, and split-debuginfo does nothing when the debuginfo is unsplit.

2. Instead of numbers, the value of trim-paths is now descriptive words (or list of words) that is passed through directly to --remap-path-scopes. This is achieved by extending --remap-path-scope to take in aliases such as object = macro,unsplit-debuginfo,split-debuginfo-file (default for release profiles). Note that this does not make trim-paths a simple pass through to rustc like most other profile options, because Cargo needs to generate and emit the actual path mappings via --remap-path-prefix when trim-paths is not none.

Since most of the implementation complexities will be in rustc and not Cargo, I really want to hear what @rust-lang/compiler thinks about this (I know you guys are busy 😅)

About this issue

This issue corresponds to a meeting proposal for the compiler team steering meeting. It corresponds to a possible topic of discussion. You can read more about the steering meeting procedure here.

Comment policy

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[pnkfelix]

Scheduled for ~~2022-06-10~~ 2022-06-17

https://calendar.google.com/event?action=TEMPLATE&tmeid=Nm8xbGtqbHBzMjdpcTRjcHAybmw4a3Y0ZjEgNnU1cnJ0Y2U2bHJ0djA3cGZpM2RhbWdqdXNAZw&tmsrc=6u5rrtce6lrtv07pfi3damgjus%40group.calendar.google.com

[pnkfelix]

We had the meeting on 2022-07-17

We discussed this doc: https://github.com/rust-lang/rfcs/blob/6e45014b20aac5c29ae34a41ffce8c768814fd60/text/3127-trim-paths.md

using this hackmd to list questions/topics: https://hackmd.io/Ha2Ird9JSBKAToxFiBbATQ

The public zulip archive serves as the record for the meeting: https://rust-lang.zulipchat.com/#narrow/stream/238009-t-compiler.2Fmeetings/topic/.5Bsteering.20meeting.5D.202022-06-17.20compiler-team.23516.3A.20sanitize/near/286493879