[LLVMbugs] [Bug 20669] New: Narrowing conversion from enum to float missed: fails to cause substitution failure

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20669

            Bug ID: 20669
           Summary: Narrowing conversion from enum to float missed: fails
                    to cause substitution failure
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            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

A narrowing conversion from an unscoped enumeration to a floating-point type
does not trigger substitution failure in Clang.
The similar narrowing conversion from long long to float does.

ref: N3290 subclause 8.5.4 [dcl.init.list] paragraph 7.

### SOURCE:
$ cat narrowingEnumToFloat.cc
enum AA : long long { A = -1, B = 0x7fffffffffffffffLL } a;

template <typename T> void foo(T, char (*)[sizeof T{ a }] = 0);
int foo(int);

int main() {
   return foo(0.f);
}


### COMPILER INVOCATION AND OUTPUT:
$ clang -cc1 -std=c++11 -x c++ narrowingEnumToFloat.cc 
narrowingEnumToFloat.cc:7:11: error: cannot initialize return object of type
'int' with an rvalue of type 'void'
   return foo(0.f);
          ^~~~~~~~
1 error generated.


### EXPECTED OUTPUT:
Successful compile.


### COMPILER VERSION INFO:
$ clang++ -v
clang version 3.5.0 (trunk 214060)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Selected multilib: .;@m64

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