[patch, libgfortran] PR88052 - Format contravening f2008 constraint C1002 permitted

[Jerry DeLisle]

Hi all,

The attached patch adjusts the constraint of missing commas between
format specifiers by only allowing if std=legacy is given at compile time.

Several existing test cases are adjusted to be standard conforming.

Regression tested on x86-64-linux-gnu.

OK for trunk? (I will include the a change log for the testsuite.)

Jerry

2018-11-24  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

PR libfortran/88052

* io/format.c (parse_format_list): Implement constraint which prohibits
   missing commas between format specifiers unless -std=legacy is given.
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