[LLVMbugs] [Bug 19808] New: Pointer-to-member conversion to bool considered indistinguishable from conversion to non-bool

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19808

            Bug ID: 19808
           Summary: Pointer-to-member conversion to bool considered
                    indistinguishable from conversion to non-bool
           Product: clang
           Version: 3.4
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hstong at ca.ibm.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

In C++03 subclause 13.3.3.2 [over.ics.rank] paragraph 4:
A conversion that is not a conversion of a pointer, or pointer to member, to
bool is better than another conversion that is such a conversion.

The source below demonstrates that Clang does not apply this rule to
conversions from pointer to members.
GCC and ICC does not have this problem.

###SOURCE:> cat ptomConvRanking.cc
struct B { };
struct D : public B { };

extern int B::*pbm;
int f(bool b);
int f(int D::*);

int main(void) {
   f(pbm);
}
Return:  0x00:0


### COMPILER INVOCATION AND OUTPUT:> clang++ -std=c++03 ptomConvRanking.cc -c
ptomConvRanking.cc:9:4: error: call to 'f' is ambiguous
   f(pbm);
   ^
ptomConvRanking.cc:5:5: note: candidate function
int f(bool b);
    ^
ptomConvRanking.cc:6:5: note: candidate function
int f(int D::*);
    ^
1 error generated.
Return:  0x01:1


### EXPECTED OUTPUT:> g++ -std=c++03 ptomConvRanking.cc -c
Return:  0x00:0


### VERSION INFO:> clang++ -v
clang version 3.4
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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