[LLVMbugs] [Bug 9000] New: enums are classified as unsigned ints instead of signed ones

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9000

           Summary: enums are classified as unsigned ints instead of
                    signed ones
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rdivacky at freebsd.org
                CC: llvmbugs at cs.uiuc.edu


typedef enum {
  X,
  Y
} foo;

int main(int argc, char **argv) {
  foo z;

  return (z >= 0);
}

the LHS of (z >= 0) is

(gdb) p E->getLHS()->dump()
(ImplicitCastExpr 0x801897ee0 'unsigned int' <IntegralCast>
  (ImplicitCastExpr 0x801897ec0 'foo':'foo' <LValueToRValue>
    (DeclRefExpr 0x801897e60 'foo':'foo' lvalue Var='z' 0x801897df0)))

cast to "unsigned int" is wrong in my opinion. it should be "int". this has the
side effect of this bogus warning:

enum.c:9:13: warning: comparison of unsigned enum expression >= 0 is always
true

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