[llvm-bugs] [Bug 51219] New: Flang not failing for invalid fixed-form files

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51219

            Bug ID: 51219
           Summary: Flang not failing for invalid fixed-form files
           Product: flang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedbugs at nondot.org
          Reporter: andrzej.warzynski at gmail.com
                CC: David.Truby at arm.com, jperier at nvidia.com,
                    kirankumartp at gmail.com, llvm-bugs at lists.llvm.org,
                    sscalpone at nvidia.com

Hi,

The following input file is a valid _free-form_, but incorrectly formatted
_fixed-form_ file:

```input.f90
PROGRAM HELLO
  write(*, *), "hello, world!"
END PROGRAM
```

Flang issues the following diagnostics when trying to parse this file as
fixed-form:

```
f18 -fsyntax-only -ffixed-form input.f90
./parse-preprocessed.F:1:1: Character in fixed-form label field must be a digit
  PROGRAM HELLO
  ^
./parse-preprocessed.F:2:3: Character in fixed-form label field must be a digit
    write(*, *), "hello, world!"
    ^
./parse-preprocessed.F:3:1: Character in fixed-form label field must be a digit
  END PROGRAM
  ^
```

However, it does not fail (i.e. `$?` is O). `gfortran` does return an error in
this situation. I believe that so should Flang. Or am I missing something here?


Tested with trunk: 81600160b3f9

Thanks,
Andrzej

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