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

[Martin Storsjö via llvm-dev]

Yup, re llvm-rc, I use it for a bunch of projects (with mostly 
unspectacular resources), where it works fine, but I do know of a few 
corner case resource types that are unimplemented. As long as you don't 
use them (menuex is one that I have noted somewhere), it might work fine 
though.

And if you have resource files with c preprocessor includes, one needs to 
manually run the preprocessing outside of llvm-rc (contrary to rc.exe 
which invokes the preprocessor internally).

// Martin

On Tue, 6 Nov 2018, Nico Weber wrote:

> I haven't cross-compiled LLVM. We have a working cross build of chrome/win,
> some notes on it athttps://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 thisdriver: 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
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> 
>