Landing: 24754ac26299

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Project / Subsystem

gcc / c++

Date

2026-08-06

Author

Jakub Jelinek

Commit

24754ac2629968fba1681ba51a96ed5bfd51546f

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: 24754ac2629968fba1681ba51a96ed5bfd51546f
source_type: github
headline: Fix mangling for empty unnamed anonymous unions/structs.
tldr: Correctly mangles empty anonymous unions or structs as unnamed data members.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• compiler
• bugfix
• mangling
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/24754ac2629968fba1681ba51a96ed5bfd51546f
date: 2026-08-06T00:00:00.000Z

This commit fixes an internal compiler error (ICE) that occurred when mangling empty anonymous unions or structs used as non-static data members. Previously, the mangling process failed because it expected a name for these constructs. The fix introduces a new mangling scheme, using an index instead of a name, similar to how unnamed bitfields are handled. This ensures correct name mangling for these C++ constructs, resolving bug PR125541.