[PATCH,v2] [AArch64] Fix testcase compilation failure

[Luis Machado <luis.machado@arm.com>]

v2:

- Removed unused constants

--

Newer distros carry newer headers that contains MTE definitions.  Account
for that fact in the MTE testcases and define constants conditionally to
prevent compilation failures.
---
 gdb/testsuite/gdb.arch/aarch64-mte.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/gdb/testsuite/gdb.arch/aarch64-mte.c b/gdb/testsuite/gdb.arch/aarch64-mte.c
index bd7f1a6cf53..fc38d58fe5e 100644
--- a/gdb/testsuite/gdb.arch/aarch64-mte.c
+++ b/gdb/testsuite/gdb.arch/aarch64-mte.c
@@ -30,22 +30,27 @@
 #include <sys/prctl.h>
 
 /* From arch/arm64/include/uapi/asm/hwcap.h */
+#ifndef HWCAP2_MTE
 #define HWCAP2_MTE              (1 << 18)
+#endif
 
 /* From arch/arm64/include/uapi/asm/mman.h */
+#ifndef PROT_MTE
 #define PROT_MTE  0x20
+#endif
 
-/* From include/uapi/linux/prctl.h */
+#ifndef PR_SET_TAGGED_ADDR_CTRL
 #define PR_SET_TAGGED_ADDR_CTRL 55
-#define PR_GET_TAGGED_ADDR_CTRL 56
 #define PR_TAGGED_ADDR_ENABLE	(1UL << 0)
+#endif
+
+/* From include/uapi/linux/prctl.h */
+#ifndef PR_MTE_TCF_SHIFT
 #define PR_MTE_TCF_SHIFT	1
-#define PR_MTE_TCF_NONE		(0UL << PR_MTE_TCF_SHIFT)
 #define PR_MTE_TCF_SYNC		(1UL << PR_MTE_TCF_SHIFT)
 #define PR_MTE_TCF_ASYNC	(2UL << PR_MTE_TCF_SHIFT)
-#define PR_MTE_TCF_MASK		(3UL << PR_MTE_TCF_SHIFT)
 #define PR_MTE_TAG_SHIFT	3
-#define PR_MTE_TAG_MASK		(0xffffUL << PR_MTE_TAG_SHIFT)
+#endif
 
 void
 access_memory (unsigned char *tagged_ptr, unsigned char *untagged_ptr)
-- 
2.25.1