GCC style weak linking in Visual Studio?

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You can do it, here is an example in C:

/*
 * pWeakValue MUST be an extern const variable, which will be aliased to
 * pDefaultWeakValue if no real user definition is present, thanks to the
 * alternatename directive.
 */

extern const char * pWeakValue;
extern const char * pDefaultWeakValue = NULL;

#pragma comment(linker, "/alternatename:_pWeakValue=_pDefaultWeakValue")

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