improve readability of error message
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/aes.c b/library/aes.c
index 1e1039b..63b36c5 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -52,10 +52,15 @@
#error "MBEDTLS_AES_USE_HARDWARE_ONLY defined, but not all prerequisites"
#endif
-#if defined(MBEDTLS_PADLOCK_C) && \
- (!defined(MBEDTLS_HAVE_ASM) || defined(MBEDTLS_AES_USE_HARDWARE_ONLY))
+#if defined(MBEDTLS_PADLOCK_C)
+#if !defined(MBEDTLS_HAVE_ASM)
#error "MBEDTLS_PADLOCK_C defined, but not all prerequisites"
#endif
+#if defined(MBEDTLS_AES_USE_HARDWARE_ONLY)
+#error "MBEDTLS_AES_USE_HARDWARE_ONLY cannot be defined when " \
+ "MBEDTLS_PADLOCK_C is set"
+#endif
+#endif
#endif
#if defined(MBEDTLS_PADLOCK_C)