[Buildroot] [PATCH 0/13 v3] Add dependency on kernel headers

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

From: "Yann E. MORIN" <yann.morin.1998@free.fr>

Hello All!

This series introduces infrastructure for packages to depend on the
required version of kernel headers.

It follows the proposal made on the list:
    http://lists.busybox.net/pipermail/buildroot/2014-February/088924.html

The basic idea is to add a symbol for each kernel header version, and
have toolchains select the appropriate symbol, and packages depend on the
appropriate symbol.

In this series:

  - such symbols are added for all kernel headers >= 3.0;

  - the internal toochain backend selects the appropriate symbol, without
    user-visible changes for known kernel headers versions, and with a new
    choice for manually-specified kernel headers version;

  - the predefined external toolchains select the appropriate symbols
    without user-visible changes; those using kernel headers older than
    3.0, select nothing, and a comment is added to state so;

  - for the custom external toolchain, a new choice is shown to the
    user, to select the appropriate kernel headers version;

  - five packages are converted to take advantage of this.

For example:

  - BR2_TOOLCHAIN_EXTERNAL_BLACKFIN_UCLINUX_2012R1 selects
    BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3

  - dvb-apps depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3


Changes v2 -> v3:
  - move the manual patch after all toolchains are converted  (Arnout)
  - rebase on top of master
  - a few typoes here and there

Changes v1 -> v2:
  - typo and asciidoc syntax in the manual  (Samuel, Thomas DS)
  - add choice for custom kernel headers  (Arnout)
  - add check to strictly enforce selection  (Thomas, Arnout)
  - add help to choice  (Thomas DS)


Regards,
Yann E. MORIN.


----------------------------------------------------------------
Yann E. MORIN (13):
      package/linux-headers: remove 2.6 snapshot
      toolchain/common: add minimum kernel headers options
      toolchain/external/predefined: add choice to select 'AT_LEAST_XXX' header version
      toolchain/external/custom: add choice to select 'AT_LEAST_XXX' header version
      package/linux-headers: select appropriate 'AT_LEAST_XXX' header version
      toolchain/external: check kernel headers version for custom toolchain
      toolchain/internal: check kernel headers version for manually-specified version
      manual: document minimal kernel headers dependency
      package/dvb-apps: requires kernel headers >= 3.3
      package/w_scan: requires kernel headers >= 3.0
      package/weston: requires kernel headers >= 3.0
      package/tvheadend: requires kernel headers >= 3.2
      package/mmc-utils: requires kernel headers >= 3.0

 Config.in.legacy                                   |   7 ++
 docs/manual/adding-packages-directory.txt          |   6 ++
 package/dvb-apps/Config.in                         |   5 +-
 package/linux-headers/Config.in.host               |  86 +++++++++++++++-
 package/linux-headers/linux-headers.mk             |   9 ++
 package/mmc-utils/Config.in                        |   5 +-
 package/tvheadend/Config.in                        |   5 +-
 package/w_scan/Config.in                           |   4 +
 package/weston/Config.in                           |   5 +-
 support/scripts/check-kernel-headers.sh            |  21 ++++
 toolchain/helpers.mk                               |  13 +++
 toolchain/toolchain-common.in                      |  79 +++++++++++++++
 toolchain/toolchain-external/Config.in             | 111 +++++++++++++++++++++
 toolchain/toolchain-external/toolchain-external.mk |   7 +-
 14 files changed, 350 insertions(+), 13 deletions(-)
 create mode 100755 support/scripts/check-kernel-headers.sh

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