[lldb-dev] [Bug 39459] New: Enum class variables can't be used as function arguments

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https://bugs.llvm.org/show_bug.cgi?id=39459

            Bug ID: 39459
           Summary: Enum class variables can't be used as function
                    arguments
           Product: lldb
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: clayborg at gmail.com
                CC: llvm-bugs at lists.llvm.org

Compile the following code
enum class Foo : short {
  a,b,c
};

bool UseFoo(Foo f) {
  return (bool)f;
}

int main() {
  Foo foo = Foo::a;
  auto r = UseFoo(foo); // breakpoint
}

Then debug it and try to call "UseFoo" with an enumeration:

$ lldb a.out 
(lldb) target create "a.out"
(lldb) b /breakpoint/
(lldb) r
Process 98692 launched: '/tmp/a.out' (x86_64)
Process 98692 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000100000f9e a.out`main at /tmp/main.cpp:11
   8    
   9    int main() {
   10     Foo foo = Foo::a;
-> 11     auto r = UseFoo(foo); // breakpoint
   12   }
   13   
Target 0: (a.out) stopped.
(lldb) p UseFoo(Foo::b)
error: no matching function for call to 'UseFoo'
candidate function not viable: no known conversion from 'short' to 'Foo' for
1st argument
(lldb) p UseFoo((Foo)Foo::b)
(bool) $0 = true

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