Landing: eaebd987e549

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Project / Subsystem

gcc / testsuite

Date

2026-06-05

Author

Jakub Jelinek

Commit

eaebd987e5492b23419b5c52482038a94066c640

Source

github

Perf win

Breaking

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project: gcc
subsystem: testsuite
patch_id: —
commit_hash: eaebd987e5492b23419b5c52482038a94066c640
source_type: github
headline: Testsuite: Improve enum argument testing of built-in functions
tldr: The GCC testsuite now performs more thorough testing of built-in functions' handling of enumerated type arguments, including those with fixed underlying types,…
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • testsuite
• builtins
• enums
• c
• c++
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/eaebd987e5492b23419b5c52482038a94066c640
date: 2026-06-05T00:00:00.000Z

The GCC testsuite now includes expanded tests for how built-in functions such as __builtin_clz, __builtin_ctz, and __builtin_bswapg handle enumerated type arguments. This enhancement specifically addresses cases involving enumerations with fixed underlying types, which were previously only partially covered in C++. The improved coverage ensures the compiler’s robustness when these built-ins process enum values in both C and C++ code, preventing potential silent miscompilations.