Landing: 6ef69b644ea9

← All landings

Project / Subsystem

gcc / lto

Date

2026-08-27

Author

Kyrylo Tkachov

Commit

6ef69b644ea98da590e3830a97a9fed3c3044ca3

Source

github

Perf win

Breaking

View on GitHub →

All attributes

project: gcc
subsystem: lto
patch_id: —
commit_hash: 6ef69b644ea98da590e3830a97a9fed3c3044ca3
source_type: github
headline: LTO: Generated Makefiles mark parallel LTRANS outputs as phony
tldr: LTO builds now correctly handle parallel LTRANS outputs with -save-temps to avoid stale objects.
author: Kyrylo Tkachov
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • lto
• optimization
• makefile
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/6ef69b644ea98da590e3830a97a9fed3c3044ca3
date: 2026-08-27T00:00:00.000Z

When using parallel LTRANS with the -save-temps option, Makefiles generated by the LTO wrapper could produce stale object files. This change marks persistent non-cache LTRANS outputs as ‘phony’ in the Makefile, ensuring that Make reruns the LTRANS recipe for the current link. A new test case verifies the fix, which passed on x86_64 and AArch64.