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MALLOC_DEBUG is set optionally on the command line. Default the value to zero if it is not set on the command line, and test its value with #if rather than #ifdef. Verified the code is identical before and after this change apart from line numbers. ChangeLog: 2014-04-11 Will Newton <will.newton@linaro.org> * malloc/malloc.c [!MALLOC_DEBUG]: #define MALLOC_DEBUG to zero if it is not defined elsewhere. (mtrim): Test the value of MALLOC_DEBUG with #if rather than #ifdef.