[LLVMbugs] [Bug 9143] New: -Wuninitialized suggests `= 0` for enums

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9143

           Summary: -Wuninitialized suggests `= 0` for enums
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
        AssignedTo: kremenek at apple.com
        ReportedBy: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu


hummer:src thakis$ cat test.cc
enum A {
  A_a, A_b
};
A f() {
  A a;
  return a;
}



hummer:src thakis$ ~/src/llvm-svn/Release+Asserts/bin/clang -c test.cc -Wall
test.cc:6:10: warning: variable 'a' is possibly uninitialized when used here
[-Wuninitialized]
  return a;
         ^
test.cc:5:3: note: variable 'a' is declared here
  A a;
  ^
test.cc:5:6: note: add initialization to silence this warning
  A a;
     ^
      = 0
1 warning generated.



But doing this is of course not valid:

hummer:src thakis$ cat test.cc
enum A {
  A_a, A_b
};
A f() {
  A a = 0;
  return a;
}
hummer:src thakis$ ~/src/llvm-svn/Release+Asserts/bin/clang -c test.cc -Wall
test.cc:5:5: error: cannot initialize a variable of type 'A' with an rvalue of
type 'int'
  A a = 0;
    ^   ~
1 error generated.

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