diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6c3fb2ca9e8..af3089a8a55 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-07-31  Joel Hutton  <Joel.Hutton@arm.com>
+
+	* config/arm/arm_cmse.h (cmse_nonsecure_caller): Add
+	warn_unused_result attribute.
+	(cmse_check_address_range): Add warn_unused_result attribute.
+
 2019-07-31  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/91257
diff --git a/gcc/config/arm/arm_cmse.h b/gcc/config/arm/arm_cmse.h
index b543cbfe455..a72c46f1a95 100644
--- a/gcc/config/arm/arm_cmse.h
+++ b/gcc/config/arm/arm_cmse.h
@@ -164,6 +164,7 @@ __CMSE_TT_ASM (at)
 
 /* FIXME: diagnose use outside cmse_nonsecure_entry functions.  */
 __extension__ static __inline int __attribute__ ((__always_inline__))
+__attribute__ ((warn_unused_result))
 cmse_nonsecure_caller (void)
 {
   return __builtin_arm_cmse_nonsecure_caller ();
@@ -184,6 +185,7 @@ cmse_nonsecure_caller (void)
 #define CMSE_MPU_READ		8
 
 __extension__ void *
+__attribute__ ((warn_unused_result))
 cmse_check_address_range (void *, size_t, int);
 
 #define cmse_check_pointed_object(p, f) \
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 26100368a8d..3d44853383c 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2019-07-31  Joel Hutton  <Joel.Hutton@arm.com>
+
+	* gcc.target/arm/cmse/cmse-17.c: New test.
+
 2019-07-30  Martin Sebor  <msebor@redhat.com>
 
 	PR testsuite/91258
diff --git a/gcc/testsuite/gcc.target/arm/cmse/cmse-17.c b/gcc/testsuite/gcc.target/arm/cmse/cmse-17.c
new file mode 100644
index 00000000000..a2cce09afae
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cmse/cmse-17.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-mcmse"}  */
+
+#include <arm_cmse.h>
+
+void foo()
+{
+	int *data;
+	cmse_check_address_range((int*)data, 0, 0); /* { dg-warning "ignoring return value" } */
+}
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index 7997ad871f4..c9aea1dde15 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-07-31  Joel Hutton  <Joel.Hutton@arm.com>
+
+	* config/arm/cmse.c (cmse_check_address_range): Add
+	warn_unused_result attribute.
+
 2019-07-22  Martin Liska  <mliska@suse.cz>
 
 	* config/pa/stublib.c: Remove stub symbol __gnu_lto_v1.
diff --git a/libgcc/config/arm/cmse.c b/libgcc/config/arm/cmse.c
index 34a46fde2d2..0c5a3eaefab 100644
--- a/libgcc/config/arm/cmse.c
+++ b/libgcc/config/arm/cmse.c
@@ -30,6 +30,7 @@
    address range.  See ACLE changes for ARMv8-M.  */
 
 void *
+__attribute__ ((warn_unused_result))
 cmse_check_address_range (void *p, size_t size, int flags)
 {
   cmse_address_info_t permb, perme;