https://llvm.org/bugs/show_bug.cgi?id=31121
Bug ID: 31121
Summary: Clang crashes on dllexport inline methods with default
arguments in PCH files in MS ABI mode
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: r...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Consider:
$ cat t.h
struct __declspec(dllexport) Foo {
enum E { E0 } e;
Foo(E e = E0) : e(e) {}
};
$ cat t.cpp
$ clang-cl -FIt.h -Yct.h t.cpp
Assertion failed: DefaultArg && "sema forgot to instantiate default args", file
..\tools\clang\lib\CodeGen\MicrosoftCXXABI.cpp, line 3877
...
Basically, dllexport interacts with PCH in interesting ways that we should
seriously revisit.
This was reduced out of blink / WebKit, which had this issue here:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/dom/ViewportDescription.h?rcl=0&l=67
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