[Buildroot] [PATCH] core/br2-external: fix use of relative paths

[Peter Korsgaard]

>>>>> "Yann" == Yann E MORIN <yann.morin.1998 at free.fr> writes:

 > When the path to a br2-external tree is relative, make enters an endless
 > recursive loop (paths elided for brevity):

 >     $ make BR2_EXTERNAL=.. foo_defconfig
 >     make[1]: stat: ../configs/../configs/../configs[...]/toto_defconfig: Filename too long
 >     make[1]: *** No rule to make target '../configs/../configs/../configs[...]/toto_defconfig',
 >     needed by '../configs/../configs/../configs[...]/toto_defconfig'.  Stop.
 >     Makefile:79: recipe for target '_all' failed
 >     make: *** [_all] Error 2

 > It is a bit complex to understand the actual technical reason for this
 > never-ending expansion; it seems it happens in the code generated by the
 > percent_defconfig macro. Not sure why, though...

 > But the root cause is the relative path.

 > Just use absolute, canonical paths to br2-external trees. Always.

 > Reported-by: outtierbert at gmail.com
 > Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>

Committed after adding to the commit message that this fixes #9576

-- 
Bye, Peter Korsgaard