[llvm-bugs] [Bug 28816] Missing error on explicit instantiation definition of undefined variable template

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=28816

John Brawn <john.brawn at arm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #1 from John Brawn <john.brawn at arm.com> ---
"template<int n> int var" is actually a definition of a template variable (with
an implicit initialization to zero), so the compiler's behaviour here is fine.
If you do "template<int n> extern int var" then that _is_ a declaration, and in
that case we get the error

tmp.cpp:2:14: error: explicit instantiation of undefined variable template
'var<0>'
template int var<0>;
             ^
tmp.cpp:1:28: note: explicit instantiation refers here
template<int n> extern int var;
                           ^
1 error generated.

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