1375507 - Rust debug symbols are broken on macOS with rustc <1.19 and codegen-units >1

Status: RESOLVED FIXED

(Firefox Build System :: General, defect)

Description

[Josh Matthews [:jdm]]

https://github.com/rust-lang/rust/issues/39160 is the issue tracking the problem with codegen-units on macOS. It is fixed in rustc 1.19, and any version before that suffers from inscrutable failures when setting breakpoints in either lldb or gdb inside Rust code.

Comment 1

[Josh Matthews [:jdm]]

We could possibly detect this situation in http://searchfox.org/mozilla-central/diff/8f7b8a3663a48975af04a6ae9d8a972669bff63e/python/mozbuild/mozbuild/frontend/emitter.py#478 and emit a non-problematic value at all times.

Comment 2

[Nathan Froyd [:froydnj]]

(In reply to Josh Matthews [:jdm] from comment #1)
> We could possibly detect this situation in
> http://searchfox.org/mozilla-central/diff/
> 8f7b8a3663a48975af04a6ae9d8a972669bff63e/python/mozbuild/mozbuild/frontend/
> emitter.py#478 and emit a non-problematic value at all times.

Unfortunately, that bit of code isn't emitting anything, it's verifying that the configuration for the gkrust libraries are what we expect them to be.

Comment 3

[Chris Peterson [:cpeterson]]

Ralph is bumping our Rust version to 1.19 in bug 1382743. That should fix this Rust debug symbol issue.

Comment 4

[Alex Vincent [:WeirdAl]]

Attachment: --enable-debug-symbols build failure at end

I spotted a build failure.  Since :froydnj is talking about gkrust, I thought I would ask if this is the same bustage before filing a new bug.

Comment 5

[Mike Hommey [:glandium]]

Fixed per comment 3.