Extension request: intl on Windows

[simonhamp]

Slightly more urgent than #429

I am going to dig into how to do it, but just wanted to raise the ticket.

[crazywhalecc]

I tried to add intl/icu support on Windows. The icu library seems to have some trouble with producing pure static libs under MSVC: The official vcxproj file only provides options to build dll.

https://github.com/unicode-org/icu/blob/69cb085e12764b84269c31be5a054e7c510be443/icu4c/source/i18n/i18n.vcxproj#L68C1-L79C25

I may need to first solve the problem of existing extensions not being able to compile before I can actually deal with it.

[crazywhalecc]

Closed: #445 (comment)

[simonhamp]

Can we revisit this yet?

[ramsey]

There's an interesting note here about --enable-static under "Configuring ICU on Windows": https://unicode-org.github.io/icu/userguide/icu4c/build.html#configuring-icu-on-windows

the following configure options currently do not work on Windows with Microsoft’s compiler. Some options can work by manually editing icu/source/common/unicode/pwin32.h, but manually editing the files is not recommended.

[...]

• --enable-static (Requires that U_STATIC_IMPLEMENTATION be defined in user code that links against ICU’s static libraries.)