Support DR entries for gcc-changelog.

* gcc-changelog/git_commit.py: Support DR entries/
	* gcc-changelog/test_email.py: New test for it.
	* gcc-changelog/test_patches.txt: New patch for it.

contrib/ChangeLog

@@ -1,3 +1,9 @@
+2020-05-21  Martin Liska  <mliska@suse.cz>
+
+	* gcc-changelog/git_commit.py: Support DR entries/
+	* gcc-changelog/test_email.py: New test for it.
+	* gcc-changelog/test_patches.txt: New patch for it.
+
 2020-05-21  Martin Liska  <mliska@suse.cz>
 
 	* mklog.py: Support DR parsing.

contrib/gcc-changelog/git_commit.py

@@ -145,6 +145,7 @@ author_line_regex = \
 additional_author_regex = re.compile(r'^\t(?P<spaces>\ *)?(?P<name>.*  <.*>)')
 changelog_regex = re.compile(r'^([a-z0-9+-/]*)/ChangeLog:?')
 pr_regex = re.compile(r'\tPR (?P<component>[a-z+-]+\/)?([0-9]+)$')
+dr_regex = re.compile(r'\tDR ([0-9]+)$')
 star_prefix_regex = re.compile(r'\t\*(?P<spaces>\ *)(?P<content>.*)')
 
 LINE_LIMIT = 100
@@ -297,7 +298,7 @@ class GitCommit:
                 continue
             if (changelog_regex.match(b) or self.find_changelog_location(b)
                     or star_prefix_regex.match(b) or pr_regex.match(b)
-                    or author_line_regex.match(b)):
+                    or dr_regex.match(b) or author_line_regex.match(b)):
                 self.changes = body[i:]
                 return
         self.errors.append(Error('cannot find a ChangeLog location in '
@@ -350,6 +351,8 @@ class GitCommit:
                         continue
                     else:
                         pr_line = line.lstrip()
+                elif dr_regex.match(line):
+                    pr_line = line.lstrip()
 
                 lowered_line = line.lower()
                 if lowered_line.startswith(CO_AUTHORED_BY_PREFIX):

contrib/gcc-changelog/test_email.py

@@ -272,3 +272,7 @@ class TestGccChangelog(unittest.TestCase):
         email = self.from_patch_glob('0001-Fortran-ProcPtr-function.patch')
         assert not email.errors
         assert len(email.changelog_entries[0].author_lines) == 1
+
+    def test_dr_entry(self):
+        email = self.from_patch_glob('0001-c-C-20-DR-2237.patch')
+        assert email.changelog_entries[0].prs == ['DR 2237']

contrib/gcc-changelog/test_patches.txt

@@ -2541,3 +2541,30 @@ index 00000000000..ecb0a43929f
 -- 
 2.26.2
 
+=== 0001-c-C-20-DR-2237.patch ===
+From 4b38d56dbac6742b038551a36ec80200313123a1 Mon Sep 17 00:00:00 2001
+From: Marek Polacek <polacek@redhat.com>
+Date: Sat, 4 Apr 2020 18:09:53 -0400
+Subject: [PATCH] c++: C++20 DR 2237, disallow simple-template-id in cdtor.
+
+This patch implements DR 2237 which says that a simple-template-id is
+no longer valid as the declarator-id of a constructor or destructor;
+see [diff.cpp17.class]#2.  It is not explicitly stated but out-of-line
+destructors with a simple-template-id are also meant to be ill-formed
+now.  (Out-of-line constructors like that are invalid since DR1435 I
+think.)  This change only applies to C++20; it is not a DR against C++17.
+
+I'm not crazy about the diagnostic in constructors but ISTM that
+cp_parser_constructor_declarator_p shouldn't print errors.
+
+	DR 2237
+	* parser.c (cp_parser_unqualified_id): Reject simple-template-id as
+	the declarator-id of a destructor.
+---
+diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
+index a6a5d975af3..a8082d39aca 100644
+--- a/gcc/cp/parser.c
++++ b/gcc/cp/parser.c
+@@ -1 +1,2 @@
+
++