Add gnu check for aseni assembly code
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/aesni.h b/library/aesni.h
index da97023..dc64442 100644
--- a/library/aesni.h
+++ b/library/aesni.h
@@ -67,7 +67,7 @@
* In the long run, we will likely remove the assembly implementation. */
#if defined(MBEDTLS_AESNI_HAVE_INTRINSICS)
#define MBEDTLS_AESNI_HAVE_CODE 2 // via intrinsics
-#elif defined(MBEDTLS_HAVE_ASM)
+#elif defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__)
#define MBEDTLS_AESNI_HAVE_CODE 1 // via assembly
#else
#error "MBEDTLS_AESNI_C defined, but neither intrinsics nor assembly available"