Landing: 964b279b15bc

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Project / Subsystem

gcc / ada

Date

2026-03-04

Author

Sebastian Poeplau

Commit

964b279b15bc165056f7a57f43c7c1a95c135cf2

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: ada
patch_id: —
commit_hash: 964b279b15bc165056f7a57f43c7c1a95c135cf2
source_type: github
headline: Ada: Align alternate stack on Linux for address sanitizer.
tldr: The Ada runtime now aligns the alternate stack on Linux to meet the requirements of the address sanitizer.
author: Sebastian Poeplau
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • ada
• asan
• memory
• alignment
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/964b279b15bc165056f7a57f43c7c1a95c135cf2
date: 2026-03-04T00:00:00.000Z

The address sanitizer (ASan) requires the alternate stack to be 8-byte aligned. This commit adds an alignment attribute to the alternate stack in the Ada runtime when compiling for Linux. This ensures compatibility with ASan, which detects memory errors, when using alternate stacks.