diff -up aws-crt-php-1.0.0/crt/aws-crt-ffi/crt/aws-lc/crypto/fipsmodule/sha/sha256.c.old aws-crt-php-1.0.0/crt/aws-crt-ffi/crt/aws-lc/crypto/fipsmodule/sha/sha256.c
--- aws-crt-php-1.0.0/crt/aws-crt-ffi/crt/aws-lc/crypto/fipsmodule/sha/sha256.c.old	2021-06-23 14:05:19.531147607 +0200
+++ aws-crt-php-1.0.0/crt/aws-crt-ffi/crt/aws-lc/crypto/fipsmodule/sha/sha256.c	2021-06-23 14:05:56.792059326 +0200
@@ -63,6 +63,7 @@
 #include "internal.h"
 #include "../../internal.h"
 
+# pragma GCC diagnostic ignored "-Wstringop-overflow"
 
 int SHA224_Init(SHA256_CTX *sha) {
   OPENSSL_memset(sha, 0, sizeof(SHA256_CTX));