Michael137 added a comment.
As @labath mentioned, we do force clang to preserve the linkage name via
`asm()`, but only for class member functions. This was added in
`675767a5910d2ec77ef8b51c78fe312cf9022896` (https://reviews.llvm.org/D40283) to
also support `abi_tag`! But that didn't cover templates functions:
Use the DWARF linkage name when importing C++ methods.
When importing C++ methods into clang AST nodes from the DWARF symbol
table, preserve the DW_AT_linkage_name and use it as the linker
("asm") name for the symbol.
Concretely, this enables `expression` to call into names that use the
GNU `abi_tag` extension
I tried adding an `AsmLabelAttr` to the `FunctionDecl`s we create when parsing
DWARF and it does fix the ABI-tag problem on my small test case. But this only
works because the way we create `FunctionTemplateDecl`s is incorrect (as I've
described in my previous comments).
So the options are any combination of the following:
1. carry this patch forward (and possibly remove the `asm()` hack for C++
member functions)
2. Add the `asm()` attribute hack to all function declarations
3. Fix the way we generate `FunctionTemplateDecl`s when parsing DWARF (this
likely needs a change to DWARF generation)
@aprantl @labath Any preference? I think a 1 and 3 are the more "proper" way to
fix this issue
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D131335/new/
https://reviews.llvm.org/D131335
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