commonlib/endian: Silence GCC -Warray-bounds false positives

Recent GCC versions (>=12) warn about out-of-bounds accesses when
writing through *(volatile uint8_t *)dest in endian.h.
This is a false positive since these pointers intentionally alias
hardware/physical memory.

Change-Id: Ia47aa1214998dbc17bd4a58f7d996bcc6fff7b6a
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89328
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/commonlib/include/commonlib/endian.h

@@ -7,6 +7,11 @@
 #include <stdint.h>
 #include <string.h>
 
+/* GCC >= 12 triggers false positives (-Warray-bounds) on
+ * deliberate low-level memory accesses here. */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
+
 /* Endian agnostic functions working on single byte. */
 
 static inline uint8_t read_ble8(const void *src)
@@ -247,4 +252,4 @@ static inline void zero_n(void *dest, size_t n)
 	memset(dest, 0, n);
 }
 
-#endif
+#endif /* _COMMONLIB_ENDIAN_H_ */