Landing: 71a5a83ea92f

← All landings

Project / Subsystem

gcc / c++

Date

2026-07-20

Author

Jakub Jelinek

Commit

71a5a83ea92f4cde1ca2b37f3b160353a729f35b

Source

github

Perf win

Breaking

View on GitHub →

All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: 71a5a83ea92f4cde1ca2b37f3b160353a729f35b
source_type: github
headline: C++: Implement __has_cpp_attribute(indeterminate) for CWG3020
tldr: Adds support for the C++26 __has_cpp_attribute(indeterminate) preprocessor check.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• cpp26
• preprocessor
• attribute
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/71a5a83ea92f4cde1ca2b37f3b160353a729f35b
date: 2026-07-20T00:00:00.000Z

GCC now correctly recognizes the __has_cpp_attribute(indeterminate) preprocessor directive, aligning with the C++26 standard. This feature, related to the indeterminate attribute, was missing from GCC’s preprocessor checks. The change updates c_common_has_attribute to handle this new attribute specifier, ensuring code using this feature can be correctly processed and tested with new test cases for C++26 and C++29.