[libcxx-commits] [PATCH] D140343: [libc++] List supported libcs

Tue Dec 20 13:43:35 PST 2022

mstorsjo added a subscriber: goncharov.
mstorsjo added inline comments.

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Comment at: libcxx/docs/index.rst:122
+Linux           i386, x86_64, arm, arm64  glibc-2.24+
+Windows         i386, x86_64              MSVCRT-???, MinGW???   Both MSVC and MinGW style environments
+AIX             powerpc, powerpc64        ???-???
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philnik wrote:
> mstorsjo wrote:
> > For the tested and supported C runtime on Windows, I'd just write `UCRT` - that's the one used both by MSVC and mingw setups (although with a little bit of different wrapping around it in the mingw case).
> > 
> > In mingw configurations, it's also buildable with msvcrt.dll - I do test building it regularly (every other day more or less), but that configuration doesn't pass all tests and isn't one of the formally supported configs.
> Is there any versioning for UCRT, and if yes - which ones work currently?
There is some versioning of it I think - as it's shipped as part of Windows and/or the Windows SDK, it does have version numbers matching the Windows builds, like e.g. `10.0.19041.0`. However the version number is seldom shown/used very visibly in UCRT contexts.

I'm not sure exactly which version ends up tested in the CI - it depends on whatever version of Windows is used in the CI base images/runners (which @goncharov maintains). I guess it'd be possible to dig it up somehow...

Practically, I would expect all versions of UCRT to "work" (it's been present since 2015 since the launch of Windows 10), while older ones might fail some corner case tests. (We also do have detection of some known UCRT bugs which is used to make the tests "pass" - so older versions might be considered passing to the same extent if we'd add similar detection for their issues.)

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  https://reviews.llvm.org/D140343/new/

https://reviews.llvm.org/D140343