[cfe-dev] [libcxx] What degree of Windows and/or MSVC support is already present?

Thu Apr 20 10:50:07 PDT 2017

I recently fixed the libc++ build with mingw, but I would say that Cygwin
is pretty unsupported. There are other mingw users: Matteuz, Martel
Mallone, Yaron Keron, and others. I don't know to what extend they use
libc++ currently, or what the current support state is like.

Broadly speaking, users seem to me moving away from thick posix emulation
layers like cygwin and over to less emulation (mingw) or no emulation (just
use MSVCRT).

On Thu, Apr 20, 2017 at 9:36 AM, Shoaib Meenai via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> None of us have worked on (or intend on working on, as far as I'm aware)
> Cygwin or MinGW support. We're just working with the native Windows
> toolchain.
>
> Get Outlook for iOS <https://aka.ms/o0ukef>
> _____________________________
> From: Ben Craig <ben.craig at ni.com>
> Sent: Thursday, April 20, 2017 6:16 AM
> Subject: RE: [cfe-dev] [libcxx] What degree of Windows and/or MSVC support
> is already present?
> To: Shoaib Meenai <smeenai at fb.com>, via cfe-dev <cfe-dev at lists.llvm.org>
> Cc: Saleem Abdulrasool <compnerd at compnerd.org>, Eric Fiselier <
> eric at efcs.ca>
>
>
> Thanks for the info.  I somehow missed the mention of experimental windows
> support on the BuildingLibcxx page.
>
>
>
> Are there any efforts to support things like Cygwin?  Or is clang-cl
> targeting Win32 and x64 desktops the extent of things now?
>
>
>
> Also, many thanks to EricWF for getting a Windows buildbot up!
>
>
>
> *From:* Shoaib Meenai [mailto:smeenai at fb.com <smeenai at fb.com>]
> *Sent:* Wednesday, April 19, 2017 3:58 PM
> *To:* Ben Craig <ben.craig at ni.com>; via cfe-dev <cfe-dev at lists.llvm.org>
> *Cc:* Saleem Abdulrasool <compnerd at compnerd.org>; Eric Fiselier <
> eric at efcs.ca>
> *Subject:* Re: [cfe-dev] [libcxx] What degree of Windows and/or MSVC
> support is already present?
>
>
>
> compnerd (CC'd) did the initial work to port libc++ to Windows (including
> adding support for native Windows threading). EricWF (also CC'd) continued
> that work, particularly around tests and vcruntime support. I've done some
> fix-ups here and there.
>
>
>
> Last I checked, libc++ on Windows x86 compiled successfully with clang-cl,
> and only failed around 200 tests (out of over 5000). There's documentation
> for building and running tests on Windows athttp://libcxx.llvm.org/docs/
> BuildingLibcxx.html#experimental-support-for-windows
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__libcxx.llvm.org_docs_BuildingLibcxx.html-23experimental-2Dsupport-2Dfor-2Dwindows&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=gCVvnEyF72ReAUBz7nZ-H5_ylVVgew6CXpPPBs_6fRo&s=hPQ92jT2EbatM8zTn1UPXwLQiz-G1IvrDvwP-JU7SRU&e=>.
> I was maintaining a Google Doc tracking the test failures at
> https://docs.google.com/spreadsheets/d/1Yonp8WidaIBb9mmzy6aV92wbjBYEa
> rgyrlIYc75r3Gk/edit#gid=0
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_spreadsheets_d_1Yonp8WidaIBb9mmzy6aV92wbjBYEargyrlIYc75r3Gk_edit-23gid-3D0&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=gCVvnEyF72ReAUBz7nZ-H5_ylVVgew6CXpPPBs_6fRo&s=Nd7pFRzuU3z5B5bd9a1RAjGzUemTIFJDnPt5RstVgo8&e=>,
> though it's probably fairly out of date now. EricWF also set up an appveyor
> bot athttps://ci.appveyor.com/project/EricWF/libcxx
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__ci.appveyor.com_project_EricWF_libcxx&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=gCVvnEyF72ReAUBz7nZ-H5_ylVVgew6CXpPPBs_6fRo&s=quwA3R7Or8hVaaW3p2bD4an33OSGRYO2jbQymGjxHoI&e=>
> .
>
>
>
> One known issue is a lack of locale support (https://bugs.llvm.org/show_
> bug.cgi?id=31516
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__bugs.llvm.org_show-5Fbug.cgi-3Fid-3D31516&d=DwMGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=gCVvnEyF72ReAUBz7nZ-H5_ylVVgew6CXpPPBs_6fRo&s=vgvM_yT1a_o4Kgjo4in2GXywOFiZoVQ6H60Lf35DCQM&e=>).
> I'll be working more on addressing that (and the remaining test failures)
> over the next couple of months.
>
>
>
> cl support hasn't been an explicit goal for any of us yet. It would
> definitely be nice to have though, and I'm aware of the work you've been
> doing on that front.
>
>
>
> *From: *cfe-dev <cfe-dev-bounces at lists.llvm.org> on behalf of cfe-dev <
> cfe-dev at lists.llvm.org>
> *Reply-To: *Ben Craig <ben.craig at ni.com>
> *Date: *Wednesday, April 19, 2017 at 1:33 PM
> *To: *cfe-dev <cfe-dev at lists.llvm.org>
> *Subject: *[cfe-dev] [libcxx] What degree of Windows and/or MSVC support
> is already present?
>
>
>
> I’ve seen some commits (largely from smeenai) that deal with Microsoft
> technologies.  I’m curious as to what is currently supported, and what is
> in progress, as it is relevant to my aspirations of Windows kernel support
> with MSVC 2017.
>
>
>
> Is any Microsoft platform as a target supported from any compiler?  Is any
> Microsoft compiler supported?
>
>
>
> I know the tests have had substantial fixes and restructuring in order to
> be used by the Microsoft libraries team (STL et al).  If libcxx itself has
> some configuration that works though, I’d like to know how to set it up so
> that I don’t break it.
>
>
>
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>
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