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toolchain helpers: introduce simplify_symlink

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The external toolchain logic flattens the directory layout in the staging
directory.  Regardless of the number of levels present in the extracted
toolchain, libraries are always copied to lib/ and usr/lib/, and directory
symbolic links are provided to make the original paths available as well.

Due to this, the same library may be reachable through a number of paths:
one path without any symbolic link, and one or more paths using directory
symlinks.

Using a direct path in a symlink destination is generally preferred because
it is clearer, but it is also more robust against accidental removal of an
intermediate directory symlink.

Introduce a helper function to simplify a symlink's destination to such a
direct path. This function will be used in a subsequent patch.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas De Schampheleire 2017-02-07 22:56:44 +01:00 committed by Thomas Petazzoni
parent a06edf201b
commit 144caf5c5b
1 changed files with 27 additions and 0 deletions
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27
toolchain/helpers.mk
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@ -451,3 +451,30 @@ $$( \
printf "$$prefix" ; \
)
endef
# Replace the destination of a symbolic link with a simpler version
# For example,
# usr/lib/libfoo.so -> ../../lib32/libfoo.so.1
# becomes
# usr/lib/libfoo.so -> ../../lib/libfoo.so.1
# since 'lib32' is a symlink to 'lib'.
#
# Likewise,
# usr/lib/octeon2/libbar.so -> ../../../lib32/octeon2/libbar.so.1
# becomes
# usr/lib/octeon2/libbar.so -> ../../lib/libbar.so.1
# assuming lib32->lib and lib/octeon2->lib.
#
# $1: symlink
# $2: base path
define simplify_symlink
( \
FULL_SRC="$$(readlink -f $$(dirname $1))/$$(basename $1)" ; \
FULL_DEST="$$(readlink -f $1)" ; \
FULL_BASE="$$(readlink -f $2)" ; \
REL_SRC="$${FULL_SRC#$${FULL_BASE}/}" ; \
REL_DEST="$${FULL_DEST#$${FULL_BASE}/}" ; \
DOTS="$(call relpath_prefix,$${REL_SRC})" ; \
ln -sf "$${DOTS}$${REL_DEST}" "$${FULL_SRC}" ; \
)
endef