hans added a comment.
I hit a snag while building some more Chromium targets. For class templates
with explicit instantiation decls in the PCH file and explicit instantiation
definitions in a .cc file, the function definition will be marked as coming
from the PCH, even though it wasn't defined there. For example:
#ifndef IN_HEADER
#define IN_HEADER
template <typename T> struct Template { Template() {} };
extern template class Template<int>;
#else
template class __declspec(dllexport) Template<int>;
#endif
This isn't a problem for regular functions where we build a decl chain: the
first declaration may come from a PCH, but the definition would be a separate
Decl object which does not.
I'm trying to figure out how to handle this.
https://reviews.llvm.org/D48426
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