Move STATIC_ASSERT_EXPR to utils.h

Static asserts are so useful we want to use them not only in our tests.
Move STATIC_ASSERT_EXPR to utils.h, an internal header, to make it
available to tests and the library implementation.

Author: Patater

library/include/utils.h

@@ -0,0 +1,37 @@
+/**
+ * \file utils.h
+ *
+ * \brief Mbed Crypto internal utilities
+ *
+ * This file contains the macros and functions useful for the development and
+ * testing of Mbed Crypto.
+ *
+ */
+/*
+ *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#ifndef MC_UTILS_H
+#define MC_UTILS_H
+
+/* A compile-time constant with the value 0. If `const_expr` is not a
+ * compile-time constant with a nonzero value, cause a compile-time error. */
+#define STATIC_ASSERT_EXPR( const_expr )                                \
+    ( 0 && sizeof( struct { int STATIC_ASSERT : 1 - 2 * ! ( const_expr ); } ) )
+
+#endif /* MC_UTILS_H */

tests/suites/helpers.function

@@ -23,6 +23,8 @@
 #include "mbedtls/memory_buffer_alloc.h"
 #endif
 
+#include "utils.h"
+
 #ifdef _MSC_VER
 #include <basetsd.h>
 typedef UINT8 uint8_t;
@@ -180,10 +182,6 @@ typedef struct data_tag
 #define IS_ARRAY_NOT_POINTER( arg ) 1
 #endif
 
-/* A compile-time constant with the value 0. If `const_expr` is not a
- * compile-time constant with a nonzero value, cause a compile-time error. */
-#define STATIC_ASSERT_EXPR( const_expr )                                \
-    ( 0 && sizeof( struct { int STATIC_ASSERT : 1 - 2 * ! ( const_expr ); } ) )
 /* Return the scalar value `value` (possibly promoted). This is a compile-time
  * constant if `value` is. `condition` must be a compile-time constant.
  * If `condition` is false, arrange to cause a compile-time error. */