[LLVMbugs] [Bug 17829] New: Functions declared extern "C" with a name matching a mangled C++ function are allowed

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17829

            Bug ID: 17829
           Summary: Functions declared extern "C" with a name matching a
                    mangled C++ function are allowed
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bugs at lovikos.net
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11493
  --> http://llvm.org/bugs/attachment.cgi?id=11493&action=edit
Error message from failed assert

If a C function is declared that has a name that matches a mangled name of a
C++ function, the first to be declared is used. Instead it should fail to build
as the symbol is already defined. In g++ this will fail to build.

The following will compile and print "Bug":

#include <cstdio>

extern "C"{
void _Z3foov()
{
    printf("Bug\n");
}
}

void foo()
{
    printf("Correct\n");
}

int main()
{
    foo();
}

When this code is compiled with a debug build of clang, the an assertion fails
with the attached message (files asked for at the end of the error message are
also included).

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