[gfortran] Fix PR 23765

[Tobias dot Schlueter at Physik dot Uni-Muenchen dot DE]

We didn't correctly reject
 COMMON /b/
(i.e. no symbols declared in common block)

Actually, it is quite clear from the original code that this was intentionally
allowed (i.e. the code removed in the first hunk can only have had that
purpose), but nevertheless the standard requires this to be rejected.

While writing a testcase, I noticed that something like
 COMMON ! a long comment
would now give an error, but it would point to the end of the comment instead of
the end of the word 'COMMON'.  This is fixed by the second hunk, the error is
still caught further down in the code, but now we point to the correct
location.

Built and tested on i686-pc-linux.  Testcase included in the diff, OK for the
mainline and 4.0?

- Tobi

Attachment: pr23765.txt
Description: Text document