[LLVMbugs] [Bug 16247] New: Assertion failure computing linkage with overload of extern "C" function

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16247

            Bug ID: 16247
           Summary: Assertion failure computing linkage with overload of
                    extern "C" function
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sharparrow1 at yahoo.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu,
                    rafael.espindola at gmail.com
    Classification: Unclassified

Assertion failed: (!isa<NamedDecl>(static_cast<decl_type*>(this)) ||
cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()), function
setPreviousDeclaration, file
/Volumes/storage/llvm/tools/clang/lib/AST/../../include/clang/AST/Decl.h, line
3402.

Testcase:
extern "C" void foo(int);
static void foo(double);
void foo(int) { }
void foo(double) {}


It looks like Sema::IsOverload forces the linkage of foo(double) to be computed
before we hook up the declaration chain, which leads to the assertion.

I'm pretty sure this is not well-formed ([dcl.link]p6 says "At most one
function with a particular name can have C language linkage.").

Rafael, this is code you've been working on relatively recently; any thoughts?

(This is also <rdar://problem/14073466>.)

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