How to enable MALLOC_PROTECT_BEFORE in Xcode?

Posted by Daniel S. on Stack Overflow See other posts from Stack Overflow or by Daniel S.
Published on 2014-06-05T11:53:32Z Indexed on 2014/06/06 9:25 UTC
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ios

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xcode

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simulator

After switching on some debug options in Xcode, it now tells me the following in the output:

GuardMalloc[Roadcast-4010]: free: magic is 0x0000090b, not 0xdeadbeef.
GuardMalloc[Roadcast-4010]: free: header magic value at 0x43f49bf0, for block 0x43f49c00-0x43f50000, has been trashed by a buffer underrun.
GuardMalloc[Roadcast-4010]: Try running with MALLOC_PROTECT_BEFORE to catch this error immediately as it happens.

How do I switch on MALLOC_PROTECT_BEFORE?

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