[HarfBuzz] Building and testing HarfBuzz 2.3.0 on MinGW

[Ebrahim Byagowi]

Hey there.
1) Agreed
2) Something feels wrong as we compile all these in our msys2 CI
<https://ci.appveyor.com/project/harfbuzz/harfbuzz/build/job/i1f71t2ild2vwsn0>
already and that shouldn't be that different from your setup
3) Uniscribe and DirectWrite backends and now CoreText, are mostly for
comparison while development, so developers can check what can be expected
behavior while development, and are not used in the test suit at least
which tends to be platform agnostic so don't use them at all if you can.

On Sat, Jan 26, 2019 at 9:05 PM Eli Zaretskii <eliz at gnu.org> wrote:

> I'm resending this after subscribing to the list, since my original
> message, send a month ago, only got an automated response that it's
> waiting for a moderator.  (Does someone actually tend to the
> moderator's tasks of this list?)
>
> I've built HarfBuzz 2.3.0 on MS-Windows using mingw.org's MinGW
> (https://osdn.net/projects/mingw/, different from MinGW64).  In
> general, the build was successful, with a small number of changes that
> I will soon report to the issue tracker.
>
> I have a few questions/suggestions as result of this experience, which
> I'd like to voice.  Thanks in advance for any responses.
>
> 1) It would be good to have some guidance in some README or in the
> HTML docs regarding the optional dependencies and configuration
> options, and their significance.  For example, it turns out Glib is
> needed to run a large portion of the test suite, something that wasn't
> clear (I initially concluded that I didn't need Glib at all).  Also,
> hb-shape is not built if Glib isn't available.  Similarly, hb-view is
> not build unless both Cairo and cairo-ft are available.
>
> 2) Several tests fail.  For example, "indic-joiners" and "use" in
> shaping/data/in-house, CVAR-1 and CVAR-2 in
> shaping/data/text-rendering-tests, most of the gpos_* tests in
> shaping/data/aots:, etc.  I also built HarfBuzz on GNU/Linux, and I
> see failures in almost the same tests.  The reason for the failures
> are some differences between the expected and the actual outputs.  Are
> these real problems, for which you'd like me to report issues, or is
> this a known problem?  Did someone succeed to run the entire test
> suite without a single failure?
>
> 3) I'm uncertain about the use of Uniscribe in the Windows build.  I
> was told that it was only used "for comparison", which I interpreted
> to mean it was used in the test suite.  But I don't think it's the
> case, since the Uniscribe dependent functions of HarfBuzz are in the
> library, so it seems like Uniscribe is used by the library itself.
> What is the purpose of using Uniscribe (and DirectWrite, when that is
> compiled in)?
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