https://bugs.llvm.org/show_bug.cgi?id=42396
Bug ID: 42396
Summary: Alignment not respected in containers for over-aligned
enumeration types
Product: libc++
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: mclow.li...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Created attachment 22140
--> https://bugs.llvm.org/attachment.cgi?id=22140&action=edit
Reproducer
Inspired by:
https://stackoverflow.com/questions/56760874/discrepancy-in-c-between-over-aligned-struct-and-enum-within-container
Given an enumeration type with a specified alignment, the elements in a vector
of such a type should be aligned correctly. This appears not to be the case -
and can lead to UBSAN going off.
In the reproducer, I also check the size of a 16-element array of these two
types.
Clang says they're different sizes - that suggests to me that there's a clang
problem here.
The alignment in the containers bit could be related to
https://bugs.llvm.org/show_bug.cgi?id=22634. (might even be the same bug)
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