__attribute__((unused)) causes MSVC 2008 C4113 and C4047

[imzyxwvu]

Branch: uv-update-1.0.0. MSVC doesn't support some C99 and GNU C features, so attribute((unused)) caused lots of warnings and some errors.

process.c:

        int fd; // should the type of this be replaced with uv_os_fd_t? MSVC reports this.
        uv_stream_t* stream = luv_check_stream(L, -1);
        int err = uv_fileno((uv_handle_t*)stream, &fd);

And util.c:

static void luv_resume_with_status(lua_State* L, int status, int nargs) {
 ...
 return luv_resume(L, 1 + nargs); // this is a void function but it has a return statement
}

And I wonder there is no co-routine design in libuv. Why it called Lua co-routine APIs? If we implement the co-routine support in C code, it won't be a BARE binding. I think co-routine wrapping should be done in Lua.

[creationix]

Should we have a new opaque type for when using FD? I don't think the windows equivalent can be represented directly as an integer.

[creationix]

Though some APIs that expect stdio FDs expect the integers 0, 1, 2 and libuv translates these integers to whatever is native on the platform.

[imzyxwvu]

It seems that libuv has changed its design about FDs at v1.0. Before that version int is used for FDs.

[creationix]

Ok, I changed my linter so I don't need those GCC markers. If there are any left I didn't remove, it's a bug. I'm sure I'll find them as I move to building on windows.