Change qr/foo$/m to qr/foo\n/m, for Perl 5.8.8.

In each case, absence of a trailing newline would itself constitute a
PostgreSQL bug.  Therefore, this slightly enhances the changed tests.
This works around a bug that last appeared in Perl 5.8.8, fixing
src/test/modules/test_pg_dump when run against that version.  Commit
e7293e3271 worked around the bug, but the
subsequent addition of test_pg_dump introduced affected code.  As that
commit had shown, slight increases in pattern complexity can suppress
the bug.  This commit edits qr/foo$/m patterns too complex to encounter
the bug today, for style consistency and robustness against unrelated
pattern changes.  Back-patch to 9.6, where test_pg_dump was introduced.

As of this writing, a fresh MSYS installation includes an affected Perl
5.8.8.  The Perl 5.8.8 in Red Hat Enterprise Linux 5.11 carries a patch
that renders it unaffected, but the Perl 5.8.5 of Red Hat Enterprise
Linux 4.4 is affected.

src/bin/pg_basebackup/t/010_pg_basebackup.pl

@@ -215,16 +215,14 @@ $node->command_ok([ 'pg_basebackup', '-D', "$tempdir/backupR", '-R' ],
 ok(-f "$tempdir/backupR/recovery.conf", 'recovery.conf was created');
 my $recovery_conf = slurp_file "$tempdir/backupR/recovery.conf";
 
-# using a character class for the final "'" here works around an apparent
-# bug in several version of the Msys DTK perl
 my $port = $node->port;
 like(
 	$recovery_conf,
-	qr/^standby_mode = 'on[']$/m,
+	qr/^standby_mode = 'on'\n/m,
 	'recovery.conf sets standby_mode');
 like(
 	$recovery_conf,
-	qr/^primary_conninfo = '.*port=$port.*'$/m,
+	qr/^primary_conninfo = '.*port=$port.*'\n/m,
 	'recovery.conf sets primary_conninfo');
 
 $node->command_ok(
@@ -273,5 +271,5 @@ $node->command_ok(
 	'pg_basebackup with replication slot and -R runs');
 like(
 	slurp_file("$tempdir/backupxs_sl_R/recovery.conf"),
-	qr/^primary_slot_name = 'slot1'$/m,
+	qr/^primary_slot_name = 'slot1'\n/m,
 	'recovery.conf sets primary_slot_name');

src/test/modules/test_pg_dump/t/001_base.pl

@@ -193,7 +193,7 @@ my %tests = (
 		create_sql   => 'CREATE EXTENSION test_pg_dump;',
 		regexp       => qr/^
 			\QCREATE EXTENSION IF NOT EXISTS test_pg_dump WITH SCHEMA public;\E
-			$/xm,
+			\n/xm,
 		like => {
 			clean            => 1,
 			clean_if_exists  => 1,
@@ -210,7 +210,7 @@ my %tests = (
 	'CREATE ROLE regress_dump_test_role' => {
 		create_order => 1,
 		create_sql   => 'CREATE ROLE regress_dump_test_role;',
-		regexp       => qr/^CREATE ROLE regress_dump_test_role;$/m,
+		regexp       => qr/^CREATE ROLE regress_dump_test_role;\n/m,
 		like         => { pg_dumpall_globals => 1, },
 		unlike       => {
 			binary_upgrade    => 1,
@@ -231,7 +231,7 @@ my %tests = (
                     \n\s+\QNO MINVALUE\E
                     \n\s+\QNO MAXVALUE\E
                     \n\s+\QCACHE 1;\E
-                    $/xm,
+                    \n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -252,7 +252,7 @@ my %tests = (
                     \n\s+\QNO MINVALUE\E
                     \n\s+\QNO MAXVALUE\E
                     \n\s+\QCACHE 1;\E
-                    $/xm,
+                    \n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -270,7 +270,7 @@ my %tests = (
 			\QCREATE TABLE regress_pg_dump_table (\E
 			\n\s+\Qcol1 integer NOT NULL,\E
 			\n\s+\Qcol2 integer\E
-			\n\);$/xm,
+			\n\);\n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -286,7 +286,7 @@ my %tests = (
 	'CREATE ACCESS METHOD regress_test_am' => {
 		regexp => qr/^
 			\QCREATE ACCESS METHOD regress_test_am TYPE INDEX HANDLER bthandler;\E
-			$/xm,
+			\n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -303,7 +303,7 @@ my %tests = (
 		regexp => qr/^
 			\QCOMMENT ON EXTENSION test_pg_dump \E
 			\QIS 'Test pg_dump with an extension';\E
-			$/xm,
+			\n/xm,
 		like => {
 			binary_upgrade   => 1,
 			clean            => 1,
@@ -322,7 +322,7 @@ my %tests = (
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(true);\E\n
 			\QGRANT SELECT ON TABLE regress_pg_dump_table TO regress_dump_test_role;\E\n
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(false);\E
-			$/xms,
+			\n/xms,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -340,7 +340,7 @@ my %tests = (
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(true);\E\n
 			\QGRANT SELECT(col1) ON TABLE regress_pg_dump_table TO PUBLIC;\E\n
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(false);\E
-			$/xms,
+			\n/xms,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -359,7 +359,7 @@ my %tests = (
 						   TO regress_dump_test_role;',
 		regexp => qr/^
 			\QGRANT SELECT(col2) ON TABLE regress_pg_dump_table TO regress_dump_test_role;\E
-			$/xm,
+			\n/xm,
 		like => {
 			binary_upgrade   => 1,
 			clean            => 1,
@@ -380,7 +380,7 @@ my %tests = (
 		                   TO regress_dump_test_role;',
 		regexp => qr/^
 			\QGRANT USAGE ON SEQUENCE regress_pg_dump_table_col1_seq TO regress_dump_test_role;\E
-			$/xm,
+			\n/xm,
 		like => {
 			binary_upgrade   => 1,
 			clean            => 1,
@@ -397,7 +397,7 @@ my %tests = (
 	'GRANT USAGE ON regress_pg_dump_seq TO regress_dump_test_role' => {
 		regexp => qr/^
 			\QGRANT USAGE ON SEQUENCE regress_pg_dump_seq TO regress_dump_test_role;\E
-			$/xm,
+			\n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -416,7 +416,7 @@ my %tests = (
 						   FROM PUBLIC;',
 		regexp => qr/^
 			\QREVOKE SELECT(col1) ON TABLE regress_pg_dump_table FROM PUBLIC;\E
-			$/xm,
+			\n/xm,
 		like => {
 			binary_upgrade   => 1,
 			clean            => 1,
@@ -436,7 +436,7 @@ my %tests = (
 			\QCREATE TABLE test_table (\E
 			\n\s+\Qcol1 integer,\E
 			\n\s+\Qcol2 integer\E
-			\n\);$/xm,
+			\n\);\n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -454,7 +454,7 @@ my %tests = (
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(true);\E\n
 			\QGRANT SELECT ON TABLE test_table TO regress_dump_test_role;\E\n
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(false);\E
-			$/xms,
+			\n/xms,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -475,7 +475,7 @@ my %tests = (
                     \n\s+\QNO MINVALUE\E
                     \n\s+\QNO MAXVALUE\E
                     \n\s+\QCACHE 1;\E
-                    $/xm,
+                    \n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -493,7 +493,7 @@ my %tests = (
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(true);\E\n
 			\QGRANT USAGE ON SEQUENCE test_seq TO regress_dump_test_role;\E\n
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(false);\E
-			$/xms,
+			\n/xms,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -510,7 +510,7 @@ my %tests = (
 		regexp => qr/^
                     \QCREATE TYPE test_type AS (\E
                     \n\s+\Qcol1 integer\E
-                    \n\);$/xm,
+                    \n\);\n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -528,7 +528,7 @@ my %tests = (
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(true);\E\n
 			\QGRANT ALL ON TYPE test_type TO regress_dump_test_role;\E\n
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(false);\E
-			$/xms,
+			\n/xms,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -545,7 +545,7 @@ my %tests = (
 		regexp => qr/^
             \QCREATE FUNCTION test_func() RETURNS integer\E
             \n\s+\QLANGUAGE sql\E
-            $/xm,
+            \n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -563,7 +563,7 @@ my %tests = (
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(true);\E\n
 			\QGRANT ALL ON FUNCTION test_func() TO regress_dump_test_role;\E\n
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(false);\E
-			$/xms,
+			\n/xms,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -581,7 +581,7 @@ my %tests = (
             \QCREATE AGGREGATE test_agg(smallint) (\E
             \n\s+\QSFUNC = int2_sum,\E
             \n\s+\QSTYPE = bigint\E
-            \n\);$/xm,
+            \n\);\n/xm,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -599,7 +599,7 @@ my %tests = (
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(true);\E\n
 			\QGRANT ALL ON FUNCTION test_agg(smallint) TO regress_dump_test_role;\E\n
 			\QSELECT pg_catalog.binary_upgrade_set_record_init_privs(false);\E
-			$/xms,
+			\n/xms,
 		like   => { binary_upgrade => 1, },
 		unlike => {
 			clean              => 1,
@@ -620,7 +620,7 @@ my %tests = (
 		regexp => qr/^
 			\QCREATE TABLE external_tab (\E
 			\n\s+\Qcol1 integer\E
-			\n\);$/xm,
+			\n\);\n/xm,
 		like => {
 			binary_upgrade   => 1,
 			clean            => 1,

src/test/perl/README

@@ -46,6 +46,10 @@ against them and evaluate the results. For example:
 
     $node->stop('fast');
 
+Test::More::like entails use of the qr// operator.  Avoid Perl 5.8.8 bug
+#39185 by not using the "$" regular expression metacharacter in qr// when also
+using the "/m" modifier.  Instead of "$", use "\n" or "(?=\n|\z)".
+
 Read the Test::More documentation for more on how to write tests:
 
     perldoc Test::More

src/tools/msvc/Project.pm

@@ -256,7 +256,7 @@ sub AddDir
 	# Match rules that pull in source files from different directories, eg
 	# pgstrcasecmp.c rint.c snprintf.c: % : $(top_srcdir)/src/port/%
 	my $replace_re =
-	  qr{^([^:\n\$]+\.c)\s*:\s*(?:%\s*: )?\$(\([^\)]+\))\/(.*)\/[^\/]+$}m;
+	  qr{^([^:\n\$]+\.c)\s*:\s*(?:%\s*: )?\$(\([^\)]+\))\/(.*)\/[^\/]+\n}m;
 	while ($mf =~ m{$replace_re}m)
 	{
 		my $match  = $1;