rjmccall added inline comments.
================
Comment at: clang/lib/AST/Mangle.cpp:137
+ (!Source || Source->UseGlobalPrefixInAsmLabelMangle()))
Out << '\01'; // LLVM IR Marker for __asm("foo")
----------------
This is one of those bugs where looking at the code really reveals a lot of
problematic behavior.
`AsmLabelAttr` is generally assumed to carry a literal label, i.e. it should
not have the global prefix added to it. We should not be changing that
assumption globally just based on whether an `ExternalASTSource` has been set
up; that's going to break in any sort of non-uniform situation, e.g. if an LLDB
user writes a declaration with an asm label, or if we import a Clang module
where a declaration has an asm label. Either `ExternalASTSource`s should be
putting the real (prefixed) symbol name in the `AsmLabelAttr`, or they should
be making `AsmLabelAttr`s that are different somehow, e.g. by giving
`AsmLabelAttr` a flag (which doesn't need to be spellable in the source
language) saying whether the label is literal or subject to global prefixing.
Separately, it seems to me that if the `AsmLabelAttr` is literal but the label
happens to include the global prefix, we should strip the prefix from the label
and not add a `\01` so that we get a consistent symbol name in LLVM.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D67774/new/
https://reviews.llvm.org/D67774
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