https://bugs.llvm.org/show_bug.cgi?id=33417
Bug ID: 33417
Summary: MS ABI: VTable Thunk not generated for imported class
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@miray.de
CC: llvm-bugs@lists.llvm.org
Created attachment 18622
--> https://bugs.llvm.org/attachment.cgi?id=18622&action=edit
Example projects to reproduce bug
The attached example (VS2013 solution/projects) generates a linker error when
the project "thunktest" is compiled with Clang instead of MSVC (the setting for
the "system" project does not matter).
The error is:
1>main.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""[thunk]:public:
virtual class Ref<class Object> __thiscall Object::obj`vtordisp{4294967292,0}'
(void)" (?obj@Object@@$4PPPPPPPM@A@AE?AV?$Ref@VObject@@@@XZ)".
This occurs if the class Object is imported from another binary. Inside the
same binary this error does not occur.
The same code compiles with MSVC (default setting of the projects) as well with
Clang on Linux (the contained Makefile is for the latter case).
The LLVM/Clang installation is a snapshot of revision r303050 downloaded from
here: http://llvm.org/pre-releases/win-snapshots/LLVM-5.0.0-r303050-win32.exe
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