[llvm-bugs] [Bug 41018] New: dllimport conflicts with exclude_from_explicit_instantiation.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41018

            Bug ID: 41018
           Summary: dllimport conflicts with
                    exclude_from_explicit_instantiation.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eric at efcs.ca
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

When both dllimport and exclude_from_explicit_instantiation are passed, Clang
still expects the function to have a externally available definition. But this
is not the case.

For example: https://godbolt.org/z/gKOHCk

This leads to linker errors because of undefined symbols.

I think one approach would be to make Clang not inherit `dllimport` attributes
on functions declared with exclude_from_explicit_instantiation. When dllimport
is applied directly, we could emit an error for incompatible attributes.

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