Landing: 72fba287f32b

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Project / Subsystem

gcc / c++

Date

2026-07-31

Author

Jakub Jelinek

Commit

72fba287f32b4a86c55c24b475de891fc88de217

Source

github

Perf win

No

Breaking

No

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project: gcc
subsystem: c++
patch_id: —
commit_hash: 72fba287f32b4a86c55c24b475de891fc88de217
source_type: github
headline: C++: Improve handling of return value checks in expansion statements
tldr: Fixes an ICE and improves diagnostic handling for return value checks in C++ expansion statements.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• templates
• compiler error
• diagnostics
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/72fba287f32b4a86c55c24b475de891fc88de217
date: 2026-07-31T00:00:00.000Z

This commit addresses an Internal Compiler Error (ICE) and improves diagnostic messages related to return value checks within C++ expansion statements. Previously, the compiler would ICE when attempting to instantiate expansion statements with dependent return values. The fix defers the full evaluation of check_return_expr until the final instantiation of the expansion statement, preventing the ICE. It also ensures that diagnostics accurately reflect the situation when return values are dependent or when specializations are involved.