[Buildroot] [PATCH 1/3] Makefile: internally use absolute paths to BR2_EXTERNAL

[Thomas De Schampheleire <patrickdepinguin@gmail.com>]

"Yann E. MORIN" <yann.morin.1998@free.fr> schreef:
>From: "Yann E. MORIN" <yann.morin.1998@free.fr>
>
>Using a relative path for BR2_EXTERNAL, and using an external defconfig,
>such as in (from a Buildroot top-dir):
>    make O=.. BR2_EXTERNAL=.. foo_defconfig
>
>is broken. It is unclear why the %_defconfig rule recurses in that case.
>
>This patch internaly makes BR2_EXTERNAL canonical (ie. makes it an absolute
>path), and checks the directory exists.
>
>Reported-by: J?r?my Rosen <jeremy.rosen@openwide.fr>
>Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
>Cc: Peter Korsgaard <jacmet@uclibc.org>
>Cc: Romain Naour <romain.naour@openwide.fr>
>Cc: Arnout Vandecappelle <arnout@mind.be>
>
>---
>Changes v1->v2:
>  - fix override BR2_EXTERNAL  (J?r?my)
>  - only one error message  (Arnout)
>---
> Makefile | 5 +++++
> 1 file changed, 5 insertions(+)
>
>diff --git a/Makefile b/Makefile
>index 98d32c0..4766160 100644
>--- a/Makefile
>+++ b/Makefile
>@@ -119,6 +119,11 @@ ifeq ($(BR2_EXTERNAL),)
>   override BR2_EXTERNAL = support/dummy-external
>   $(shell rm -f $(BR2_EXTERNAL_FILE))
> else
>+  _BR2_EXTERNAL = $(shell cd $(BR2_EXTERNAL) >/dev/null 2>&1 && pwd)
>+  ifeq ($(_BR2_EXTERNAL),)
>+    $(error BR2_EXTERNAL='$(BR2_EXTERNAL)' does not exist, relatively to $(TOPDIR))

I think this should be 'relative to'.

Best regards,
Thomas