[LLVMbugs] [Bug 23984] New: -Wtautological-compare doesn't warn on comparing default-initialized enums

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23984

            Bug ID: 23984
           Summary: -Wtautological-compare doesn't warn on comparing
                    default-initialized enums
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider this snippet, where someone tried to call GetVersion() but instead
default-initialized an enum:


$ cat test.cc
namespace base {
enum Version { kXP, kVista };
Version GetVersion();
}

void f() {
  if (base::Version() == base::kXP)
    ;
}


I'd expect that comparison to be flagged by -Wtautological-compare, but it
isn't:


$ bin/clang -Weverything test.cc -c
test.cc:6:6: warning: no previous prototype for function 'f'
[-Wmissing-prototypes]
void f() {
     ^
1 warning generated.

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