[Buildroot] [Patch v2 1/1] Fix selection of bootloaders from $(BR2_EXTERNAL)

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Eric Le Bihan,

On Tue,  7 Oct 2014 15:01:32 +0200, Eric Le Bihan wrote:
> If a package is based on "generic-package", pkg-generic.mk will compute
> the name of the Kconfig variable to use for checking if this package has
> been selected by the user.
> 
> Unfortunately, this mechanism does not take into account the case where
> a bootloader is declared in a $(BR2_EXTERNAL)/boot directory.
> 
> So, even if the bootloader has been selected, it will not be added to
> $(TARGETS) and will not be built.
> 
> This patch fixes this issue, as well as handle toolchains.
> 
> Changes v1 -> v2:
> 
>   - use multiple patterns in filter (suggested by ThomasDS).
>   - handle toolchains.
> 
> Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
> ---
>  package/pkg-generic.mk | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index d04fd36..e201803 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -614,9 +614,9 @@ $$($(2)_TARGET_DIRCLEAN):		PKG=$(2)
>  # kernel case, the bootloaders case, and the normal packages case.
>  ifeq ($(1),linux)
>  $(2)_KCONFIG_VAR = BR2_LINUX_KERNEL
> -else ifneq ($$(filter boot/%,$(pkgdir)),)
> +else ifneq ($$(filter boot/% $(BR2_EXTERNAL)/boot/%,$(pkgdir)),)
>  $(2)_KCONFIG_VAR = BR2_TARGET_$(2)
> -else ifneq ($$(filter toolchain/%,$(pkgdir)),)
> +else ifneq ($$(filter toolchain/% $(BR2_EXTERNAL)/toolchain/%,$(pkgdir)),)
>  $(2)_KCONFIG_VAR = BR2_$(2)
>  else
>  $(2)_KCONFIG_VAR = BR2_PACKAGE_$(2)

Well, this makes the assumption that $(BR2_EXTERNAL) bootloaders should
be in boot/ and $(BR2_EXTERNAL) toolchain stuff should be in toolchain/.

In practice, the boot/ and toolchain/ organization in the main
Buildroot does not necessarily need to be reflected in $(BR2_EXTERNAL):
you can have a bootloader in $(BR2_EXTERNAL)/package/foobar/, just name
its option BR2_PACKAGE_FOOBAR and not BR2_TARGET_FOOBAR.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com