https://bugs.llvm.org/show_bug.cgi?id=51277
Bug ID: 51277
Summary: [DWARF] DW_AT_alignment incorrect when
attribute((__aligned__)) is present but ignored
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: wolfgang_p...@playstation.sony.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
// Given the following source,
struct MyType { int m; } __attribute__((aligned(1)));
MyType mt;
when simply compiled with clang++ -c -g, produces a DW_TAG_structure_type DIE
for MyType, with DW_AT_alignment having a value of 1.
However, the actual alignment of the type is 4, since, according to the gcc
documentation, the alignment attribute, when used on structs, can only increase
alignment, and not decrease it (unless attribute "packed" is also specified).
clang does return the correct value from alignof(). See
https://gcc.gnu.org/onlinedocs/gcc-11.2.0/gcc/Common-Type-Attributes.html#Common-Type-Attributes.
g++ generates a type DIE for MyType with DW_AT_alignment being 4.
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