Landing: b0f09b72d9e1

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Project / Subsystem

gcc / i386

Date

2026-05-06

Author

Oleg Tolmatcev

Commit

b0f09b72d9e1783e8ccaf2d8c1c72b03e3973f0b

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: i386
patch_id: —
commit_hash: b0f09b72d9e1783e8ccaf2d8c1c72b03e3973f0b
source_type: github
headline: i386: Keep SEH enabled for Win64 sysv_abi functions
tldr: SEH is now kept enabled for Win64 functions compiled with SysV ABI, ensuring consistent exception handling.
author: Oleg Tolmatcev
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • i386
• x86_64
• seh
• exception handling
• windows
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/b0f09b72d9e1783e8ccaf2d8c1c72b03e3973f0b
date: 2026-05-06T00:00:00.000Z

On Win64, functions compiled with the SysV ABI were losing Structured Exception Handling (SEH) hooks due to TARGET_SEH depending on TARGET_64BIT_MS_ABI. This could result in inconsistent assembly code with .seh_handlerdata outside any .seh_proc block. This commit ensures that TARGET_SEH remains enabled for all 64-bit Windows functions when unwind tables are requested. This ensures consistent SEH prologue and handler state across ABI variants.