Follow-up fixes for "Make all Perl warnings fatal"

Mostly, we need to check whether $ENV{PG_TEST_EXTRA} is set before
doing regular expression matches against it.

src/interfaces/libpq/t/004_load_balance_dns.pl

@@ -6,7 +6,7 @@ use PostgreSQL::Test::Utils;
 use PostgreSQL::Test::Cluster;
 use Test::More;
 
-if ($ENV{PG_TEST_EXTRA} !~ /\bload_balance\b/)
+if (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bload_balance\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test load_balance not enabled in PG_TEST_EXTRA';

src/test/kerberos/t/001_auth.pl

@@ -28,7 +28,7 @@ if ($ENV{with_gssapi} ne 'yes')
 {
 	plan skip_all => 'GSSAPI/Kerberos not supported by this build';
 }
-elsif ($ENV{PG_TEST_EXTRA} !~ /\bkerberos\b/)
+elsif (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bkerberos\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test GSSAPI/Kerberos not enabled in PG_TEST_EXTRA';
@@ -203,7 +203,7 @@ system_or_bail $krb5kdc, '-P', $kdc_pidfile;
 
 END
 {
-	kill 'INT', `cat $kdc_pidfile` if -f $kdc_pidfile;
+	kill 'INT', `cat $kdc_pidfile` if defined($kdc_pidfile) && -f $kdc_pidfile;
 }
 
 note "setting up PostgreSQL instance";

src/test/ldap/t/001_auth.pl

@@ -18,7 +18,7 @@ if ($ENV{with_ldap} ne 'yes')
 {
 	plan skip_all => 'LDAP not supported by this build';
 }
-elsif ($ENV{PG_TEST_EXTRA} !~ /\bldap\b/)
+elsif (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bldap\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test LDAP not enabled in PG_TEST_EXTRA';

src/test/ldap/t/002_bindpasswd.pl

@@ -18,7 +18,7 @@ if ($ENV{with_ldap} ne 'yes')
 {
 	plan skip_all => 'LDAP not supported by this build';
 }
-elsif ($ENV{PG_TEST_EXTRA} !~ /\bldap\b/)
+elsif (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bldap\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test LDAP not enabled in PG_TEST_EXTRA';

src/test/modules/ldap_password_func/t/001_mutated_bindpasswd.pl

@@ -20,7 +20,7 @@ if ($ENV{with_ldap} ne 'yes')
 {
 	plan skip_all => 'LDAP not supported by this build';
 }
-elsif ($ENV{PG_TEST_EXTRA} !~ /\bldap\b/)
+elsif (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bldap\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test LDAP not enabled in PG_TEST_EXTRA';

src/test/modules/xid_wraparound/t/001_emergency_vacuum.pl

@@ -7,7 +7,7 @@ use PostgreSQL::Test::Cluster;
 use PostgreSQL::Test::Utils;
 use Test::More;
 
-if ($ENV{PG_TEST_EXTRA} !~ /\bxid_wraparound\b/)
+if (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bxid_wraparound\b/)
 {
 	plan skip_all => "test xid_wraparound not enabled in PG_TEST_EXTRA";
 }

src/test/modules/xid_wraparound/t/002_limits.pl

@@ -14,7 +14,7 @@ use PostgreSQL::Test::Utils;
 use Test::More;
 use Time::HiRes qw(usleep);
 
-if ($ENV{PG_TEST_EXTRA} !~ /\bxid_wraparound\b/)
+if (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bxid_wraparound\b/)
 {
 	plan skip_all => "test xid_wraparound not enabled in PG_TEST_EXTRA";
 }

src/test/modules/xid_wraparound/t/003_wraparounds.pl

@@ -10,7 +10,7 @@ use PostgreSQL::Test::Utils;
 use Test::More;
 use Time::HiRes qw(usleep);
 
-if ($ENV{PG_TEST_EXTRA} !~ /\bxid_wraparound\b/)
+if (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bxid_wraparound\b/)
 {
 	plan skip_all => "test xid_wraparound not enabled in PG_TEST_EXTRA";
 }

src/test/ssl/t/001_ssltests.pl

@@ -17,7 +17,7 @@ if ($ENV{with_ssl} ne 'openssl')
 {
 	plan skip_all => 'OpenSSL not supported by this build';
 }
-elsif ($ENV{PG_TEST_EXTRA} !~ /\bssl\b/)
+elsif (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bssl\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test SSL not enabled in PG_TEST_EXTRA';

src/test/ssl/t/002_scram.pl

@@ -20,7 +20,7 @@ if ($ENV{with_ssl} ne 'openssl')
 {
 	plan skip_all => 'OpenSSL not supported by this build';
 }
-elsif ($ENV{PG_TEST_EXTRA} !~ /\bssl\b/)
+elsif (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bssl\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test SSL not enabled in PG_TEST_EXTRA';

src/test/ssl/t/003_sslinfo.pl

@@ -18,7 +18,7 @@ if ($ENV{with_ssl} ne 'openssl')
 {
 	plan skip_all => 'OpenSSL not supported by this build';
 }
-elsif ($ENV{PG_TEST_EXTRA} !~ /\bssl\b/)
+elsif (!$ENV{PG_TEST_EXTRA} || $ENV{PG_TEST_EXTRA} !~ /\bssl\b/)
 {
 	plan skip_all =>
 	  'Potentially unsafe test SSL not enabled in PG_TEST_EXTRA';