[llvm-bugs] [Bug 37679] New: -Wc++-compat should warn on implicit conversions from int to enum

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37679

            Bug ID: 37679
           Summary: -Wc++-compat should warn on implicit conversions from
                    int to enum
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tobias at grosser.es
                CC: llvm-bugs at lists.llvm.org

```
$cat /tmp/test.c 
enum ENUM {
        ENUM_A,
        ENUM_B,
};

enum ENUM foo() {
        int x;
        enum ENUM e;

        e = x; // should warn
        x = e; // no warning
        return x; // should warn
}

enum ENUM bar() {
        return ENUM_A; // no warning
}
```

gcc warns here when using `-Wc++-compat`.

$gcc -Wc++-compat /tmp/test.c -c
/tmp/test.c: In function ‘foo’:
/tmp/test.c:10:4: warning: enum conversion in assignment is invalid in C++
[-Wc++-compat]
  e = x; // should warn
    ^
/tmp/test.c:12:9: warning: enum conversion in return is invalid in C++
[-Wc++-compat]
  return x; // should warn
         ^

clang does not warn, but should.

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