[v4,1/2] Support for multiple BR2_GLOBAL_PATCH_DIR

Adding support for specifying multiple directories in
BR2_GLOBAL_PATCH_DIR. This will allow for a layered approach for the
patching of a package.

Signed-off-by: Ryan Barnett <rjbarnet@rockwellcollins.com>
Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>

---
Changes v3 -> v4:
  - None

Changes v2 -> v3:
  - changed the generation of patch directories to use 'addsuffix'
    instead of a foreach loop. (suggested by Arnout)

Changes v1 -> v2:
  - change wording in Config.in help (suggested by Thomas D)
---
 Config.in              |   20 ++++++++++++--------
 package/pkg-generic.mk |    5 ++++-
 2 files changed, 16 insertions(+), 9 deletions(-)

On Tue, Dec 17, 2013 at 10:00 AM, Ryan Barnett
<rjbarnet@rockwellcollins.com> wrote:
> Adding support for specifying multiple directories in
> BR2_GLOBAL_PATCH_DIR. This will allow for a layered approach for the
> patching of a package.
>
> Signed-off-by: Ryan Barnett <rjbarnet@rockwellcollins.com>
> Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com>
> Cc: Arnout Vandecappelle <arnout@mind.be>
>
> ---
> Changes v3 -> v4:
>   - None
>
> Changes v2 -> v3:
>   - changed the generation of patch directories to use 'addsuffix'
>     instead of a foreach loop. (suggested by Arnout)
>
> Changes v1 -> v2:
>   - change wording in Config.in help (suggested by Thomas D)
> ---
>  Config.in              |   20 ++++++++++++--------
>  package/pkg-generic.mk |    5 ++++-
>  2 files changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/Config.in b/Config.in
> index 2b401cb..d55e57c 100644
> --- a/Config.in
> +++ b/Config.in
> @@ -461,18 +461,22 @@ config BR2_PACKAGE_OVERRIDE_FILE
>           Buildroot documentation for more details on this feature.
>
>  config BR2_GLOBAL_PATCH_DIR
> -       string "global patch directory"
> +       string "global patch directories"
>         help
> -         You may specify a directory containing global package patches.
> -         For a specific version <packageversion> of a specific package
> -         <packagename>, patches are applied as follows.
> +         You may specify a space separated list of one or more directories
> +         containing global package patches. For a specific version
> +         <packageversion> of a specific package <packagename>, patches are
> +         applied as follows:
>
> -         First, the default Buildroot patch set for the package is applied.
> +         First, the default Buildroot patch set for the package is applied
> +         from the package's directory in Buildroot.
>
> -         If the directory $(BR2_GLOBAL_PATCH_DIR)/<packagename>/<packageversion>
> -         exists, then all *.patch files in the directory will be applied.
> +         Then for every directory - <global-patch-dir> - that exists in
> +         BR2_GLOBAL_PATCH_DIR, if the directory
> +         <global-patch-dir>/<packagename>/<packageversion>/ exists, then all
> +         *.patch files in this directory will be applied.
>
> -         Otherwise, if the directory $(BR2_GLOBAL_PATCH_DIR)/<packagename> exists,
> +         Otherwise, if the directory <global-patch-dir>/<packagename> exists,
>           then all *.patch files in the directory will be applied.
>
>  endmenu
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index 45b808a..66034ba 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -134,8 +134,11 @@ endif
>  # The RAWNAME variable is the lowercased package name, which allows to
>  # find the package directory (typically package/<pkgname>) and the
>  # prefix of the patches
> +#
> +# For BR2_GLOBAL_PATCH_DIR, only generate if it is defined
>  $(BUILD_DIR)/%/.stamp_patched: NAMEVER = $(RAWNAME)-$($(PKG)_VERSION)
> -$(BUILD_DIR)/%/.stamp_patched: PATCH_BASE_DIRS = $($(PKG)_DIR_PREFIX)/$(RAWNAME) $(call qstrip,$(BR2_GLOBAL_PATCH_DIR))/$(RAWNAME)
> +$(BUILD_DIR)/%/.stamp_patched: PATCH_BASE_DIRS =  $($(PKG)_DIR_PREFIX)/$(RAWNAME)
> +$(BUILD_DIR)/%/.stamp_patched: PATCH_BASE_DIRS += $(addsuffix /$(RAWNAME),$(call qstrip,$(BR2_GLOBAL_PATCH_DIR)))
>  $(BUILD_DIR)/%/.stamp_patched:
>         @$(call step_start,patch)
>         @$(call MESSAGE,"Patching")

Reviewed-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>