16 regression] -fstrict-aliasing miscompile struct swap when there is another identical struct (from flint code base)

mikpelinux at gmail dot com via Gcc-bugs Fri, 02 Jan 2026 04:41:23 -0800

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123356


Mikael Pettersson <mikpelinux at gmail dot com> changed:

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--- Comment #3 from Mikael Pettersson <mikpelinux at gmail dot com> ---
FWIW my bisect said this regressed with r15-5470-g8b02cc9a4f2b8d:

8b02cc9a4f2b8db48da2a3460655b062eaa147ba is the first new commit
commit 8b02cc9a4f2b8db48da2a3460655b062eaa147ba (HEAD)
Author: Martin Uecker <[email protected]>
Date:   Fri Nov 8 18:46:10 2024 +0100

    c: fix incorrect TBAA for tagged types across translation units [PR117490]

[Bug c/123356] [15/16 regression] -fstrict-aliasing miscompile struct swap when there is another identical struct (from flint code base)

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