[llvm-bugs] [Bug 35033] New: clang-format reformats already formatted code (comment before preprocessor directive)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35033

            Bug ID: 35033
           Summary: clang-format reformats already formatted code (comment
                    before preprocessor directive)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: curdeius at gmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Tested on clang-format trunk r316311 from 2017-10-23.

The following code:

```
{
  // clang-format off
  #define M 5
}
```

gets formmatted to:

```
{
// clang-format off
  #define M 5
}
```

Reformatting again leads to the original code again... and it cycles.

Apparently, it has to do with comments before preprocessor directives and seems
to be related to bug #31911 (https://bugs.llvm.org/show_bug.cgi?id=31911).

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