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

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

Peter, All,

On 2017-01-16 13:55 +0100, Peter Korsgaard spake thusly:
> >>>>> "Yann" == Yann E MORIN <yann.morin.1998@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@free.fr>
> 
> Committed after adding to the commit message that this fixes #9576

Damn, right. Thanks! :-)

Regards,
Yann E. MORIN.

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