Check in the pristine copy of ICU 4.6...

icu46/source/common/uassert.h

+/*
+******************************************************************************
+*
+*   Copyright (C) 2002-2003, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*
+* File uassert.h
+*
+*  Contains U_ASSERT macro
+*
+*    By default, U_ASSERT just wraps the C library assert macro.
+*    By changing the definition here, the assert behavior for ICU can be changed
+*    without affecting other non-ICU uses of the C library assert().
+*
+******************************************************************************
+*/
+
+#ifndef U_ASSERT_H
+#define U_ASSERT_H
+/* utypes.h is included to get the proper define for uint8_t */
+#include "unicode/utypes.h"
+#if U_RELEASE
+#define U_ASSERT(exp)
+#else
+#include <assert.h>
+#define U_ASSERT(exp) assert(exp)
+#endif
+#endif
+
+