http://llvm.org/bugs/show_bug.cgi?id=21399
Bug ID: 21399
Summary: Don't dllexport vftable in anonymous classes
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Consider:
namespace {
struct __declspec(dllexport) S {
virtual void foo();
};
};
void __declspec(dllexport) f() {
S s;
}
bin\clang-cl /LD d:\src\tmp\a.cc
Creating library a.lib and object a.exp
a-755166.obj : error LNK2001: unresolved external symbol "public: virtual void
_
_thiscall `anonymous namespace'::S::foo(void)" (?foo@S@?A@@UAEXXZ)
a.exp : error LNK2001: unresolved external symbol "const `anonymous
namespace'::
S::`vftable'" (??_7S@?A@@6B@)
a.dll : fatal error LNK1120: 2 unresolved externals
clang-cl.exe: error: linker command failed with exit code 1120 (use -v to see
in
vocation)
We should not try to export the vftable here. We should also warn the user that
exporting things in the anonymous namespace doesn't make sense (and for
dllimport maybe we should error?)
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