Landing: 49a5c52438b6

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Project / Subsystem

gcc / libbacktrace

Date

2026-07-06

Author

Ian Lance Taylor

Commit

49a5c52438b6a85b49884e596ae53e33150c296e

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: libbacktrace
patch_id: —
commit_hash: 49a5c52438b6a85b49884e596ae53e33150c296e
source_type: github
headline: libbacktrace supports DWARF discriminator field
tldr: libbacktrace now provides the DWARF 'discriminator' field for more precise inlined function call information.
author: Ian Lance Taylor
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • libbacktrace
• debugging
• dwarf
• compiler
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/49a5c52438b6a85b49884e596ae53e33150c296e
date: 2026-07-06T00:00:00.000Z

The libbacktrace library has been enhanced to support the DWARF ‘discriminator’ field, which helps distinguish between multiple calls to the same function at the same source location, particularly in inlined code. This change introduces a new struct backtrace_moredata and updates DWARF parsing to capture and report this discriminator value. This provides more accurate and detailed stack traces, especially in complex codebases with extensive inlining.