https://bugs.llvm.org/show_bug.cgi?id=42680
Bug ID: 42680
Summary: WebAssembly: libc++abi and clang disagree and width of
guard variables in __cxa_guard_acquire/release
Product: libc++abi
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: s...@chromium.org
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
In ItaniumCXXABI.cpp we set UseARMGuardVarABI=true for WebAssembly, but in
cxxabi.h we only set the guard type to 32-bit on arm.
This means that clang allocates 4 butes for the guard but libc++abi will assume
it 8 bytes and clobber memory on __cxa_guard_acquire/__cxa_guard_release.
I suggest we simply stop setting UseARMGuardVarABI unless there was a good
reason for doing this?
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