[LLVMbugs] [Bug 15695] New: #pragma weak foo = bar and 'extern foo' are ambiguous

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15695

            Bug ID: 15695
           Summary: #pragma weak foo = bar and 'extern foo' are ambiguous
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: gribozavr at gmail.com
                CC: llvmbugs at cs.uiuc.edu, rafael.espindola at gmail.com
    Classification: Unclassified

GCC 4.7.2 compiles the following program:

extern int PFoo(int);
#pragma weak PFoo = Foo
int Foo(int a) { return a; }
int main() {
  return PFoo(1);
}

while Clang emits an error:

$ clang weak.c
weak.c:5:8: error: call to 'PFoo' is ambiguous
return PFoo(1);
       ^~~~
weak.c:1:12: note: candidate function
extern int PFoo(int);
           ^
weak.c:2:14: note: candidate function
#pragma weak PFoo = Foo
             ^
1 error generated.

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