All,

This is a simple patch. The original intent was for -fdec to set
-fd-lines-as-comments by default if flag_d_lines was unspecified by
the user. However, currently flag_d_lines is interrogated in
set_dec_flags(), usually before its final value is determined. The
attached patch fixes this behavior to work as intended.

Any objections for trunk? If not I think it is safe to commit.

---
Fritz Reese

From e2761d73e818a5095bcc130ddbafe27022e25ba6 Mon Sep 17 00:00:00 2001
From: Fritz Reese <Reese-Fritz@zai.com>
Date: Mon, 31 Jul 2017 12:46:10 -0400
Subject: [PATCH] Correctly set -fd-lines-as-comments with -fdec

    gcc/fortran/
        * options.c (set_dec_flags, gfc_post_options): Set flag_d_lines
        with -fdec when not set by user.

    gcc/testsuite/gfortran.dg/
        * dec_d_lines_1.f, dec_d_lines_2.f: New.