wolfssl/wolfcrypt/error-crypt.h: add backward compatibility macro def…

…initions for MP_ error codes.

wolfssl/wolfcrypt/error-crypt.h

@@ -338,6 +338,17 @@ WOLFSSL_ABI WOLFSSL_API const char* wc_GetErrorString(int error);
     #include <wolfssl/debug-trace-error-codes.h>
 #else
     #define WC_NO_ERR_TRACE(label) (label)
+
+    /* historically, these MP_ error codes were macros.  accommodate application
+     * code that tests if they're defined, or otherwise depends on them being
+     * macros.
+     */
+    #ifndef BUILDING_WOLFSSL
+        #define MP_MEM MP_MEM
+        #define MP_VAL MP_VAL
+        #define MP_WOULDBLOCK MP_WOULDBLOCK
+        #define MP_NOT_INF MP_NOT_INF
+    #endif
 #endif
 
 #ifdef __cplusplus