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support/dependencies: add a check for python3

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Since version 2.29, glibc requires python 3.4 or later to build the
GNU C Library [1].

We add a new check to verify the version of python3 interpreter
installed on the host.  If no suitable python3 interpreter is found,
define BR2_PYTHON3_HOST_DEPENDENCY to add host-python3 in package
dependencies when needed.

[1] https://www.sourceware.org/ml/libc-alpha/2019-01/msg00723.html

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Tested-by: Adam Duskett <aduskett@gmail.com>
Reviewed-by: Adam Duskett <aduskett@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[Thomas: drop not so useful comment in the .mk file, as suggested by
Yann E. Morin.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Romain Naour 2019-03-12 23:35:24 +01:00 committed by Thomas Petazzoni
parent 048b66016e
commit b60729784a
2 changed files with 39 additions and 0 deletions
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8
support/dependencies/check-host-python3.mk Normal file
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# Since version 2.29, glibc requires python 3.4 or later to build the GNU C Library.
# https://www.sourceware.org/ml/libc-alpha/2019-01/msg00723.html
BR2_PYTHON3_VERSION_MIN = 3.4
ifeq (,$(call suitable-host-package,python3,$(BR2_PYTHON3_VERSION_MIN) python3 python))
BR2_PYTHON3_HOST_DEPENDENCY = host-python3
endif

31
support/dependencies/check-host-python3.sh Executable file
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#!/bin/sh
# prevent shift error
[ $# -lt 2 ] && exit 1
version_min="$(echo ${1} | awk '{ split($1, v, "."); print v[1] v[2] }')"
shift
# The host python interpreter is already checked by dependencies.sh but
# it only check if the version is at least 2.7.
# We want to check the version number of the python3 interpreter even
# if Buildroot is able to use any version but some packages may require
# a more recent version.
for candidate in "${@}" ; do
python3=`which $candidate 2>/dev/null`
if [ ! -x "$python3" ]; then
continue
fi
version=`$python3 -V 2>&1 | awk '{ split($2, v, "."); print v[1] v[2] }'`
if [ $version -lt $version_min ]; then
# no suitable python3 found
continue
fi
# suitable python3 found
echo $python3
break
done