[Buildroot] [PATCH 2/3] cmake: add documentation about how it is built

[Yann E. MORIN <yann.morin.1998@free.fr>]

Luca, All,

On 2016-07-01 17:53 +0200, Luca Ceresoli spake thusly:
> Commit 7b17bafc5d7948aff3059e058ada80ad1fc50500 by Davide Viti has a
> detailed explanation of some unusual techniques used for building
> host-cmake and (target-)cmake. This is useful information for whoever
> starts hacking on it, so copy it in the makefile, where it will be
> easily noticed.
> 
> Also remove the sentence about host-cmake having a runtime dependency
> on host-pkgconfig (not true anymore: it's the specific cmake-packages
> that depend on it) and fix typos.
> 
> Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
> Cc: Samuel Martin <s.martin49@gmail.com>
> Cc: Davide Viti <zinosat@tiscali.it>
> Cc: Arnout Vandecappelle <arnout@mind.be>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

> ---
>  package/cmake/cmake.mk | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/package/cmake/cmake.mk b/package/cmake/cmake.mk
> index 33fb4aa..d734e03 100644
> --- a/package/cmake/cmake.mk
> +++ b/package/cmake/cmake.mk
> @@ -10,6 +10,18 @@ CMAKE_SITE = https://cmake.org/files/v$(CMAKE_VERSION_MAJOR)
>  CMAKE_LICENSE = BSD-3c
>  CMAKE_LICENSE_FILES = Copyright.txt
>  
> +# CMake is a particular package:
> +# * CMake can be built using the generic infrastructure or the cmake one.
> +#   Since Buildroot has no requirement regarding the host system cmake
> +#   program presence, it uses the generic infrastructure to build the
> +#   host-cmake package, then the (target-)cmake package can be built
> +#   using the cmake infrastructure;
> +# * CMake bundles its dependencies within its sources. This is the
> +#   reason why the host-cmake package has no dependencies:, whereas
> +#   the (target-)cmake package has a lot of dependencies, using only
> +#   the system-wide libraries instead of rebuilding and statically
> +#   linking with the ones bundled into the CMake sources.
> +
>  HOST_CMAKE_DEPENDENCIES =
>  CMAKE_DEPENDENCIES = zlib jsoncpp libcurl libarchive expat bzip2 xz
>  
> -- 
> 2.7.4
> 
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