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configure: automatically pick python3 is available

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Unless overridden via an env var or configure arg, QEMU will only look
for the 'python' binary in $PATH. This is unhelpful on distros which
are only shipping Python 3.x (eg Fedora) in their default install as,
if they comply with PEP 394, the bare 'python' binary won't exist.

This changes configure so that by default it will search for all three
common python binaries, preferring to find Python 3.x versions.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190327170701.23798-1-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-03-27 17:07:01 +00:00 committed by Eduardo Habkost
parent b36b59371f
commit faf441429a
1 changed files with 15 additions and 3 deletions
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18
configure vendored
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@ -899,7 +899,18 @@ fi
: ${make=${MAKE-make}} : ${make=${MAKE-make}}
: ${install=${INSTALL-install}} : ${install=${INSTALL-install}}
: ${python=${PYTHON-python}} # We prefer python 3.x. A bare 'python' is traditionally
# python 2.x, but some distros have it as python 3.x, so
# we check that before python2
python=
for binary in "${PYTHON-python3}" python python2
do
if has "$binary"
then
python="$binary"
break
fi
done
: ${smbd=${SMBD-/usr/sbin/smbd}} : ${smbd=${SMBD-/usr/sbin/smbd}}
# Default objcc to clang if available, otherwise use CC # Default objcc to clang if available, otherwise use CC
@ -1818,8 +1829,9 @@ EOF
exit 0 exit 0
fi fi
if ! has $python; then if test -z "$python"
error_exit "Python not found. Use --python=/path/to/python" then
error_exit "Python not found. Use --python=/path/to/python"
fi fi
# Note that if the Python conditional here evaluates True we will exit # Note that if the Python conditional here evaluates True we will exit