From 8ae6a0193c04fa76759791c31d43f36313e43ce0 Mon Sep 17 00:00:00 2001
From: Jerry Yu <jerry.h.yu@arm.com>
Date: Thu, 16 Feb 2023 15:16:20 +0800
Subject: [PATCH] Add comments about gcc-5

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
---
 library/sha256.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/library/sha256.c b/library/sha256.c
index 81c011b33..bf9af6b5a 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -54,7 +54,10 @@
 #        pragma clang attribute push (__attribute__((target("crypto"))), apply_to=function)
 #        define MBEDTLS_POP_TARGET_PRAGMA
 #      elif defined(__GNUC__)
-#        if __GNUC__ < 6 /* TODO: check sha256 compatible for GCC */
+         /* FIXME: GCC-5 annouce crypto extension, but some intrinsic are missed.
+          *        Known miss intrinsic can be workaround.
+          */
+#        if __GNUC__ < 6
 #          error "A more recent GCC is required for MBEDTLS_SHA256_USE_A64_CRYPTO_*"
 #        else
 #          pragma GCC push_options