[debug] allow build system to provide custom file name (#2706)

src/core/common/debug.hpp

@@ -58,16 +58,24 @@
 
 #include "openthread/platform/misc.h"
 
-#define assert(cond)                              \
+/**
-    do                                            \
+ * Allow the build system to provide a custom file name.
-    {                                             \
+ *
-        if (!(cond))                              \
+ */
-        {                                         \
+#ifndef FILE_NAME
-            otPlatAssertFail(__FILE__, __LINE__); \
+#define FILE_NAME __FILE__
-            while (1)                             \
+#endif
-            {                                     \
+
-            }                                     \
+#define assert(cond)                               \
-        }                                         \
+    do                                             \
+    {                                              \
+        if (!(cond))                               \
+        {                                          \
+            otPlatAssertFail(FILE_NAME, __LINE__); \
+            while (1)                              \
+            {                                      \
+            }                                      \
+        }                                          \
     } while (0)
 
 #else