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

[xuyang2018.jy@fujitsu.com <xuyang2018.jy@fujitsu.com>]

Hi Petr
> Signed-off-by: Petr Vorel<pvorel@suse.cz>
> ---
>   doc/supported-kernel-libc-versions.txt | 57 ++++++++++++++++++++++++++
>   1 file changed, 57 insertions(+)
>   create mode 100644 doc/supported-kernel-libc-versions.txt
>
> diff --git a/doc/supported-kernel-libc-versions.txt b/doc/supported-kernel-libc-versions.txt
> new file mode 100644
> index 000000000..b7ae01f11
> --- /dev/null
> +++ b/doc/supported-kernel-libc-versions.txt
> @@ -0,0 +1,57 @@
> +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.
AFAIK, travis uses lastest distribution image to build. So it may exist 
the situation that it build pass on lastest centos7 and build failed on 
older centos7. I think we should add a note in here.
> +
> +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].
> +
> +1.2 Supported architectures
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +[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
> +(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].