Landing: 64627d4f8349

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Project / Subsystem

gcc / gcc/c++/reflection

Date

2026-06-09

Author

Marek Polacek

Commit

64627d4f8349af24f5a84c0936eb00256769b534

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: gcc/c++/reflection
patch_id: —
commit_hash: 64627d4f8349af24f5a84c0936eb00256769b534
source_type: github
headline: C++ reflection avoids Internal Compiler Error with constructor parameters.
tldr: GCC fixes an Internal Compiler Error (ICE) that occurred when compiling C++ reflection features with debug information for constructor parameters.
author: Marek Polacek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• reflection
• bugfix
• debug
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/64627d4f8349af24f5a84c0936eb00256769b534
date: 2026-06-09T00:00:00.000Z

This commit addresses an Internal Compiler Error (ICE) that arose when generating debug information (-g) for C++ reflection of constructor parameters. The previous code relied on FUNCTION_FIRST_USER_PARM which could encounter a null tree because DECL_ARGUMENTS was prematurely set to NULL during compilation. The fix involves using DECL_PARM_INDEX instead to determine the parameter index, ensuring that valid parameter information is always available during reflection, even after function bodies are optimized away.