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Overriding CRT libraries in VS2005

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I'm migrating my projects from 2003 to 2005. I'm using my own version of the crt libs (malloc, calloc, etc). In 2003, I was able to supply my own implementations and was able to link to them. I'm starting to move over to 2005 and I'm getting a lot of redefinition warnings: cmemory.cpp(173) : warning C4565: 'malloc' : redefinition; the symbol was previously declared with __declspec(restrict) and multiply symbol errors: LIBCMT.lib(calloc.obj) : error LNK2005: _calloc already defined in cmemory.lib(cmemory.obj) Any new compiler/linker options or features I might have overlooked that would allow me to do this again?

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