configure.ac (ACX_PROG_CXX_WARNING_OPTS): Revert r273311.

gcc/ChangeLog:
	* configure.ac (ACX_PROG_CXX_WARNING_OPTS): Revert r273311.

From-SVN: r273742

gcc/ChangeLog

+2019-07-23  Martin Sebor  <msebor@redhat.com>
+
+	* configure.ac (ACX_PROG_CXX_WARNING_OPTS): Revert r273311.
+
 2019-07-23  Vladislav Ivanishin <vlad@ispras.ru>
 
 	* gdbinit.in (reload-gdbhooks): New command with an attached doc string.
@@ -1364,9 +1368,11 @@
 	(ix86_noce_conversion_profitable_p): Same.
 	(ix86_init_cost): Same.
 	(ix86_simd_clone_usable): Same.
-	* configure.ac: Same.
+	* configure.ac (ACX_PROG_CXX_WARNING_OPTS): Add -Wclass-is-pod and
+	Wstruct-not-pod.
 	* coretypes.h: Same.
-	* data-streamer-in.c (string_for_index): Same.
+	* data-streamer-in.c (string_for_index): Change class-key of PODs
+	to struct and others to class.
 	(streamer_read_indexed_string): Same.
 	(streamer_read_string): Same.
 	(bp_unpack_indexed_string): Same.

gcc/configure.ac

@@ -482,8 +482,7 @@ AC_ARG_ENABLE(build-format-warnings,
 AS_IF([test $enable_build_format_warnings = no],
       [wf_opt=-Wno-format],[wf_opt=])
 ACX_PROG_CXX_WARNING_OPTS(
-	m4_quote(m4_do([-W -Wall -Wclass-is-pod -Wmismatched-tags ],
-		       [-Wno-narrowing -Wstruct-not-pod -Wwrite-strings ],
+	m4_quote(m4_do([-W -Wall -Wno-narrowing -Wwrite-strings ],
 		       [-Wcast-qual -Wno-error=format-diag $wf_opt])),
 		       [loose_warn])
 ACX_PROG_CC_WARNING_OPTS(