Does Windows have a __declspec equivalent to Unix

问题:

I want to import some C code but override its main() function. I can do this in Unix by prefacing the C code's main declaration with __attribute__((weak)), however, this won't compile in Windows, because neither Strawberry Perl's GCC nor MinGW's GCC recognize __attribute__((weak)).

Reading the docs online, __declspec seems to function similarly. Is there a __declspec equivalent to Unix GCC's __attribute__((weak)) macro?

This is a more specific version of an earlier question I posted.

回答1:

There's another way with MSVC that I think would work if you care to use it.

/*
 * 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")

See this old SO answer for some other options.

回答2:

There's also __declspec(selectany)