[llvm-bugs] [Bug 47796] New: #pragma weak A = B doesn't handle the case where A is already declared

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47796

            Bug ID: 47796
           Summary: #pragma weak A = B doesn't handle the case where A is
                    already declared
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                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

Testcase:

void f();
void g();
#pragma weak f = g
void h() { f(); }

... asserts in C mode, because it declares two different functions named 'f',
surprising the code that builds the CallExpr in h.

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