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core/br2-external: fix use of relative paths

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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@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 05576fca13)
This commit is contained in:
Yann E. MORIN 2017-01-14 16:20:52 +01:00 committed by Peter Korsgaard
parent b13040fa27
commit 7979d1ba71
1 changed files with 2 additions and 1 deletions
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3
support/scripts/br2-external
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@ -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}}\""