[llvm-bugs] [Bug 41776] New: Using __attribute__((weak, dllimport)) results in clang generating invalid IR

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41776

            Bug ID: 41776
           Summary: Using __attribute__((weak,dllimport)) results in clang
                    generating invalid IR
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Consder:

int __attribute__((weak, dllimport)) my_weak(int x); // { return x; }
int main() {
  if (my_weak)
    my_weak(0);
  return 13;
}

$ clang -cc1 -triple x86_64-windows-msvc t.c -S -o t.s
Global is marked as dllimport, but not external
i32 (i32)* @my_weak
fatal error: error in backend: Broken module found, compilation aborted!
Stack dump:
0.      Program arguments: C:\src\llvm-project\build\bin\clang.exe -cc1 -triple
x86_64-windows-msvc t.c -S -o t.s
1.      <eof> parser at end of file
2.      Per-function optimization

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