diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5de4552a107..4dd079acd00 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2008-02-27  Jan Beulich  <jbeulich@novell.com>
+
+	* gcc.target/i386/mmx-1.c: Add
+	-Werror-implicit-function-declaration to dg-options.
+	* gcc.target/i386/mmx-2.c: Likewise.
+	* gcc.target/i386/sse-13.c: Likewise.
+	* gcc.target/i386/sse-14.c: Likewise.
+
 2008-02-27  Revital Eres  <eres@il.ibm.com>
 
 	PR rtl-optimization/34999
diff --git a/gcc/testsuite/gcc.target/i386/mmx-1.c b/gcc/testsuite/gcc.target/i386/mmx-1.c
index 63d81885d78..c310c5d70fb 100644
--- a/gcc/testsuite/gcc.target/i386/mmx-1.c
+++ b/gcc/testsuite/gcc.target/i386/mmx-1.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O2 -mmmx" } */
+/* { dg-options "-O2 -Werror-implicit-function-declaration -mmmx" } */
 
 /* Test that the intrinsics compile with optimization.  All of them are
    defined as inline functions in mmintrin.h that reference the proper
diff --git a/gcc/testsuite/gcc.target/i386/mmx-2.c b/gcc/testsuite/gcc.target/i386/mmx-2.c
index 6f6f89b8d29..f2bfac1b80d 100644
--- a/gcc/testsuite/gcc.target/i386/mmx-2.c
+++ b/gcc/testsuite/gcc.target/i386/mmx-2.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O0 -mmmx" } */
+/* { dg-options "-O0 -Werror-implicit-function-declaration -mmmx" } */
 
 /* Test that the intrinsics compile without optimization.  All of them are
    defined as inline functions in mmintrin.h that reference the proper
diff --git a/gcc/testsuite/gcc.target/i386/sse-13.c b/gcc/testsuite/gcc.target/i386/sse-13.c
index 05e9a9eea24..d71fea48782 100644
--- a/gcc/testsuite/gcc.target/i386/sse-13.c
+++ b/gcc/testsuite/gcc.target/i386/sse-13.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O2 -march=k8 -m3dnow -msse4 -msse5" } */
+/* { dg-options "-O2 -Werror-implicit-function-declaration -march=k8 -m3dnow -msse4 -msse5" } */
 
 /* Test that the intrinsics compile with optimization.  All of them are
    defined as inline functions in {,x,e,p,t,s,a,b}mmintrin.h and mm3dnow.h
diff --git a/gcc/testsuite/gcc.target/i386/sse-14.c b/gcc/testsuite/gcc.target/i386/sse-14.c
index ff8a9ffa488..8e011e598cc 100644
--- a/gcc/testsuite/gcc.target/i386/sse-14.c
+++ b/gcc/testsuite/gcc.target/i386/sse-14.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O0 -march=k8 -m3dnow -msse4 -msse5" } */
+/* { dg-options "-O0 -Werror-implicit-function-declaration -march=k8 -m3dnow -msse4 -msse5" } */
 
 /* Test that the intrinsics compile without optimization.  All of them are
    defined as inline functions in {,x,e,p,t,s,a,b}mmintrin.h  and mm3dnow.h