[LTP] [RFC PATCH 1/1] doc: Add supported kernel, libc versions

[Cyril Hrubis <chrubis@suse.cz>]

Hi!
> +Supported kernel, libc, toolchain versions
> +==========================================
> +
> +1. Build testing with Travis CI
> +-------------------------------
> +
> +We test master branch in https://travis-ci.org/github/linux-test-project/ltp/builds[travis CI]
> +to ensure LTP builds on various distributions including old, current and bleeding edge.
> +We test both gcc and clang toolchains, various arch with cross-compilation.
> +
> +For list of tested distros see
> +https://github.com/linux-test-project/ltp/blob/master/.travis.yml[.travis.yml].
> +
> +
> +NOTE: Travis does only build testing, passing the CI means only that the
> +      test compiles fine on variety of different distributions and releases.
> +
> +1.1 Oldest tested distributions
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +[align="center",options="header"]
> +|==============================================================
> +| Distro                       | kernel | glibc | gcc   | clang
> +| CentOS 7                     | 3.10   | 2.17  | 4.8.5 | -
> +| Ubuntu 16.04 LTS xenial      | 4.4    | 2.23  | 5.3.1 | -
> +| Debian 9 stretch (oldstable) | 4.9.30 | 2.24  | 6.3.0 | 3.8
> +|==============================================================
> +
> +For older versions please use https://github.com/linux-test-project/ltp/releases[older LTP releases].

I'm not sure that this is a good suggestion.

I would write something as:

Older distributions are not officially supported, which means that it
may or may not work. It all depends on your luck. It should be possible
to compile latest LTP even on slightly older distributions than we
support with a few manual tweaks, e.g. disabling manually tests for
newly added syscalls manually, etc.

If latest LTP cannot be compiled even with some amount of workarounds,
you may result to older LTP releases, however these are _not_ supported
in any way. Also if you are trying to run LTP on more than 10 years old
distribution you may as well reconsider you life choices.

> +1.2 Supported architectures
        ^
	Tested?

We do support more than we test, right?

> +~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +[align="center",options="header"]
> +|==================================
> +| arch          | build
> +| x86_64        | native
> +| x86 emulation | native
> +| aarch64       | cross compilation
> +| ppc64le       | cross compilation
> +| s390x         | cross compilation
> +|==================================
> +
> +1.3 Supported libc
> +~~~~~~~~~~~~~~~~~~
> +
> +Targeted libc is https://www.gnu.org/software/libc/[GNU C Library (glibc)].
> +
> +https://uclibc-ng.org/[uClibc-ng] is not being tested should work as well as it
> +attempt to maintain a glibc compatible interface
> +(older https://www.uclibc.org/[uClibc] might have problems).
> +
> +https://musl.libc.org/[musl] is not yet supported
                                          ^
					  fully?
> +(see https://github.com/linux-test-project/ltp/blob/master/travis/alpine.sh[travis script]
> +for list of files which need to be deleted in order to compile under musl).
> +
> +For bionic libc please (Android) use https://android.googlesource.com/platform/external/ltp/[AOSP fork].


Thanks a lot for starting this.

-- 
Cyril Hrubis
chrubis@suse.cz