[Buildroot] [git commit branch/2016.11.x] core/br2-external: fix use of relative paths

[Buildroot] [git commit branch/2016.11.x] core/br2-external: fix use of relative paths

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=7979d1ba7126b4c02fcdbb5dd7685ecfd9664d80
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2016.11.x

Fixes #9576

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.

[Peter: add bugzilla reference]
Reported-by: outtierbert at gmail.com
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

(cherry picked from commit 05576fca13b129da8c7186ee2307981135d3391f)
---
 support/scripts/br2-external | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/support/scripts/br2-external b/support/scripts/br2-external
index 84bc334..26bcac8 100755
--- a/support/scripts/br2-external
+++ b/support/scripts/br2-external
@@ -106,7 +106,8 @@ do_validate_one() {
         error "'%s/Config.in': no such file or directory\n" "${br2_ext}"
     fi
 
-    # Register this br2-external tree
+    # Register this br2-external tree, use an absolute canonical path
+    br2_ext="$( cd "${br2_ext}"; pwd )"
     BR2_EXT_NAMES+=( "${br2_name}" )
     eval BR2_EXT_PATHS_${br2_name}="\"\${br2_ext}\""
     eval BR2_EXT_DESCS_${br2_name}="\"\${br2_desc:-\${br2_name}}\""