[llvm-dev] Trying to cross-compile LLVM runtimes to Windows

[Nico Weber via llvm-dev]

I haven't cross-compiled LLVM. We have a working cross build of chrome/win,
some notes on it at
https://cs.chromium.org/chromium/src/docs/win_cross.md?type=cs&q=win_cross.md&sq=package:chromium&l=34

I don't have any experience cross-compiling with cmake.

For chrome, we still use the rc.cc at
https://github.com/nico/hack/tree/master/res (through this driver:
https://cs.chromium.org/chromium/src/build/toolchain/win/rc/rc.py?q=file:rc.py&sq=package:chromium&dr)
which was the prototype for llvm-rc. We haven't switched to llvm-rc yet; my
impression was that llvm-rc isn't super production quality yet (but some
people do use it successfully).

On Tue, Nov 6, 2018 at 9:04 AM Martin Storsjö <martin at martin.st> wrote:

> Yes, I don't think mingw will fit his needs, but it's at least some
> datapoint wrt "does anybody do this". But as most of the tool interfaces
> are different it probably won't hit the same issues anyway.
>
> // Martin
>
>
> On Tue, 6 Nov 2018, Zachary Turner wrote:
>
> > I suspect mingw is going to be incompatible with Petr’s needs. Adding
> Nico
> > as he probably does the most cross compiling.  I did it a little several
> > weeks ago, just not with libc++, and I don’t remember running into any
> > problems.
> >
> > One thing that’s not clear to me is why the resource compiler is even
> being
> > invoked at all
> >
> > On Tue, Nov 6, 2018 at 5:46 AM Martin Storsjö via llvm-dev
> > <llvm-dev at lists.llvm.org> wrote:
> >       On Tue, 6 Nov 2018, Jean-Michaël Celerier via llvm-dev wrote:
> >
> >       > I have been using this project with great success to achieve
> >       this :
> >       > https://github.com/mstorsjo/llvm-mingw
> >       >
> >       > It generates a linux-based windows cross-compiler with clang,
> >       libc++, etc.
> >
> >       FWIW, lately I've added prebuilt packages of it that you can run
> >       on actual
> >       windows as well, even though cross compilation was my first/main
> >       focus.
> >
> >       > I was able to build a large part of Qt with it afterwards for
> >       instance.
> >
> >       Any particular part of Qt which you weren't able to build with
> >       it? I
> >       regularly build Qt (qtbase) for i686/x86_64/armv7/aarch64, and
> >       as part of
> >       VLC, I also build a few more Qt modules (qtdeclarative,
> >       qtquickcontrols2)
> >       for i686 and x86_64.
> >
> >       // Martin
> >       _______________________________________________
> >       LLVM Developers mailing list
> >       llvm-dev at lists.llvm.org
> >       http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
> >
> >
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