[LLVMbugs] [Bug 19917] New: static_cast to rvalue reference rejected although reference binding via conversion function works

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19917

            Bug ID: 19917
           Summary: static_cast to rvalue reference rejected although
                    reference binding via conversion function works
           Product: clang
           Version: 3.4
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hstong at ca.ibm.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The declaration in foo() appears to satisfy the requirements in N3290 subclause
5.2.9 [expr.static.cast] paragraph 4 for the static_cast in bar() to be valid.
Clang does not seem to like the static_cast; GCC does.

### SOURCE:> cat rvRefStaticCastViaUDC.cc 
struct A { };

struct B {
   operator A();
} bObj;

void foo() { A &&a(bObj); }

void bar() { static_cast<A &&>(bObj); }
Return:  0x00:0


### COMPILER OUTPUT AND INVOCATION:> clang++ -std=c++11 -c
rvRefStaticCastViaUDC.cc 
rvRefStaticCastViaUDC.cc:9:14: error: cannot cast from lvalue of type 'struct
B' to rvalue reference type 'A &&'; types are not compatible
void bar() { static_cast<A &&>(bObj); }
             ^~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
Return:  0x01:1


### EXPECTED OUTPUT:> g++-4.8 -std=c++11 -c rvRefStaticCastViaUDC.cc 
Return:  0x00:0


### VERSION INFO:> clang++ -v
clang version 3.4 (tags/RELEASE_34/final)
Target: powerpc64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.4
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Selected GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Return:  0x00:0

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