https://bugs.llvm.org/show_bug.cgi?id=32064
Bug ID: 32064
Summary: __atomic_is_lock_free incompatible with GCC
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: t.p.northo...@gmail.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
The pre-C11 function, __atomic_is_lock_free takes a second argument that
determines the alignment of the type/value in some way.
GCC appears to do this by looking at the value and libstdc++ passes "(void
*)-alignof(Type)". Clang, however, looks at the alignment of the pointee type
("void" in this case).
This results in a real libcall, which may not actually be available (I think).
Either way, it's not what GCC does.
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