[LLVMbugs] [Bug 12498] New: clang erroneously compiles conversion of initializer_list to forward-declared class

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12498

             Bug #: 12498
           Summary: clang erroneously compiles conversion of
                    initializer_list to forward-declared class
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: jonathan.sauer at gmx.de
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


The following program compiles with clang r154288, even though it shouldn't:

class ArrayRef;

struct C {
    void foo(const ArrayRef&); // (Mis-)compiles
    //void foo(ArrayRef); // Error
};

static void bar(C* c)
{
    c->foo({ nullptr, 1 });
}

int main(int, char**)
{
    bar(nullptr);
}


This should result in a compile error, as ArrayRef is merely forward-declared
and thus has no constructor that could be called in bar. Instead, clang simply
drops the call to "foo" (taken from Shark's static analyzer, no optimizations):

bar(C*):
  pushq    %rbp
  movq     %rsp, %rbp            
  movq     %rdi, -8(%rbp)            
  popq     %rbp            
  ret                  


When foo expects the ArrayRef by value instead of by const reference, clang
correctly raises a compile error.

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