chromium/src
0
Fork 0
Code Activity

Update mac/lld documentation

Browse Source 
Bug: 1149587
Change-Id: I9c4e4c730885d78ca3943e342e6aa57955690de2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3206018
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/main@{#928392}
This commit is contained in:
Nico Weber
2021-10-05 22:50:54 +00:00
committed by Chromium LUCI CQ
parent e1eb4c7b77
commit 9710c12c21
1 changed files with 6 additions and 8 deletions

14
docs/mac_lld.md

@ -1,7 +1,7 @@
# LLD for Mac builds
Like on most other platforms, Chromium uses the LLD linker on macOS.
This is a recent change. If things go well, it will ship in m93,
Like on most other platforms, Chromium uses the LLD linker on iOS and macOS.
This is a recent change. If things go well, it will ship in m95,
but we might discover showstopper bugs that delay things a bit.
@ -37,8 +37,7 @@ LLD has advantages unrelated to speed, too:
codebases, they all use LLVM libraries. That gives them similar behavior.
Using LLD unifies the build across platforms somewhat.
For that reason, we moved to LLD for macOS builds (not for iOS builds,
that's intentionally not in scope at the moment).
For that reason, we moved to LLD for iOS and macOS builds.
Just like the LLD ELF port tries to be commandline-compatible with other ELF
linkers and the LLD COFF port tries to be commandline-compatible with the
@ -48,14 +47,13 @@ different platforms.
## Current status and known issues
LLD is used by default in all build configurations except for PGO
profile collection builds ([bug](https://crbug.com/1220128)). All
LLD is used by default in almost all build configurations. All
tests on all bots are passing, both Intel and Arm.
There are a few open issues:
- LLD implements deduplication (aka "ICF"), but it's not enabled by
default. We don't turn it on yet.
- LLD implements deduplication (aka "ICF"), but we don't yet
enable it in arm builds ([bug](https://crbug.com/1253924)).
- LLD doesn't yet implement call graph profile sort.
- LTO support in LLD/macOS isn't complete yet, and we don't use LTO
on macOS yet for that reason.