From d48dec46f2b634228682fd8782b4b343628326d2 Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Wed, 15 Apr 2015 12:39:55 +1000
Subject: [PATCH] 4099.   [port]          clang: make unknown commandline
 options hard errors                         when determining what options are
 supported.                         [RT #39273]

(cherry picked from commit e840f92bfba0881039f1cdfb3349ecb03382b7be)
---
 CHANGES      | 4 ++++
 configure    | 4 ++--
 configure.in | 4 ++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/CHANGES b/CHANGES
index 98693cd9f5..5e157c77df 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+4099.	[port]		clang: make unknown commandline options hard errors
+			when determining what options are supported.
+			[RT #39273]
+
 4098.	[bug]		Address use-after-free issue when using a
 			predecessor key with dnssec-settime. [RT #39272]
 
diff --git a/configure b/configure
index a5b6ca279d..7792d075bc 100755
--- a/configure
+++ b/configure
@@ -16833,7 +16833,7 @@ if test "X$GCC" = "Xyes"; then
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if \"$CC\" supports -fno-strict-aliasing" >&5
 $as_echo_n "checking if \"$CC\" supports -fno-strict-aliasing... " >&6; }
 	SAVE_CFLAGS="$CFLAGS"
-	CFLAGS="$CFLAGS -fno-strict-aliasing"
+	CFLAGS="$CFLAGS -Werror -fno-strict-aliasing"
 	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -16866,7 +16866,7 @@ $as_echo "no" >&6; }
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if \"$CC\" supports -fno-delete-null-pointer-checks" >&5
 $as_echo_n "checking if \"$CC\" supports -fno-delete-null-pointer-checks... " >&6; }
 	SAVE_CFLAGS="$CFLAGS"
-	CFLAGS="$CFLAGS -fno-delete-null-pointer-checks"
+	CFLAGS="$CFLAGS -Werror -fno-delete-null-pointer-checks"
 	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
diff --git a/configure.in b/configure.in
index 632233649e..6850b1b36c 100644
--- a/configure.in
+++ b/configure.in
@@ -2263,7 +2263,7 @@ if test "X$GCC" = "Xyes"; then
 	STD_CWARNINGS="$STD_CWARNINGS -W -Wall -Wmissing-prototypes -Wcast-qual -Wwrite-strings -Wformat -Wpointer-arith"
 	AC_MSG_CHECKING(if "$CC" supports -fno-strict-aliasing)
 	SAVE_CFLAGS="$CFLAGS"
-	CFLAGS="$CFLAGS -fno-strict-aliasing"
+	CFLAGS="$CFLAGS -Werror -fno-strict-aliasing"
 	AC_TRY_COMPILE(,, [FNOSTRICTALIASING=yes],[FNOSTRICTALIASING=no])
 	CFLAGS="$SAVE_CFLAGS"
 	if test "$FNOSTRICTALIASING" = "yes"; then
@@ -2277,7 +2277,7 @@ if test "X$GCC" = "Xyes"; then
 	#
 	AC_MSG_CHECKING(if "$CC" supports -fno-delete-null-pointer-checks)
 	SAVE_CFLAGS="$CFLAGS"
-	CFLAGS="$CFLAGS -fno-delete-null-pointer-checks"
+	CFLAGS="$CFLAGS -Werror -fno-delete-null-pointer-checks"
 	AC_TRY_COMPILE(,, [FNODELETENULLPOINTERCHECKS=yes],
 			  [FNODELETENULLPOINTERCHECKS=no])
 	CFLAGS="$SAVE_CFLAGS"