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configure: eliminate Python dependency for --help 

The ./configure script should produce --help output even if Python is
not installed.

Listing trace backends is simple: show the names of all Python modules
in scripts/tracetool/backend/ whose source code contains 'PUBLIC =
True'.

Perform the backend enumeration in shell instead of Python so that we
can move the Python check until after ./configure --help.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20170328134418.3426-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-03-28 14:44:18 +01:00
parent fa54abb8c2
commit c53eeaf75a
1 changed files with 19 additions and 16 deletions
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35
configure vendored
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@ -1191,21 +1191,6 @@ for opt do
esac
done
if ! has $python; then
error_exit "Python not found. Use --python=/path/to/python"
fi
# Note that if the Python conditional here evaluates True we will exit
# with status 1 which is a shell 'false' value.
if ! $python -c 'import sys; sys.exit(sys.version_info < (2,6) or sys.version_info >= (3,))'; then
error_exit "Cannot use '$python', Python 2.6 or later is required." \
"Note that Python 3 or later is not yet supported." \
"Use --python=/path/to/python to specify a supported Python."
fi
# Suppress writing compiled files
python="$python -B"
case "$cpu" in
ppc)
CPU_CFLAGS="-m32"
@ -1280,6 +1265,9 @@ for config in $mak_wilds; do
default_target_list="${default_target_list} $(basename "$config" .mak)"
done
# Enumerate public trace backends for --help output
trace_backend_list=$(echo $(grep -le '^PUBLIC = True$' scripts/tracetool/backend/*.py | sed -e 's/^.*\/\(.*\)\.py$/\1/'))
if test x"$show_help" = x"yes" ; then
cat << EOF
@ -1333,7 +1321,7 @@ Advanced options (experts only):
set block driver read-only whitelist
(affects only QEMU, not qemu-img)
--enable-trace-backends=B Set trace backend
Available backends: $($python $source_path/scripts/tracetool.py --list-backends)
Available backends: $trace_backend_list
--with-trace-file=NAME Full PATH,NAME of file to store traces
Default:trace-<pid>
--disable-slirp disable SLIRP userspace network connectivity
@ -1433,6 +1421,21 @@ EOF
exit 0
fi
if ! has $python; then
error_exit "Python not found. Use --python=/path/to/python"
fi
# Note that if the Python conditional here evaluates True we will exit
# with status 1 which is a shell 'false' value.
if ! $python -c 'import sys; sys.exit(sys.version_info < (2,6) or sys.version_info >= (3,))'; then
error_exit "Cannot use '$python', Python 2.6 or later is required." \
"Note that Python 3 or later is not yet supported." \
"Use --python=/path/to/python to specify a supported Python."
fi
# Suppress writing compiled files
python="$python -B"
# Now we have handled --enable-tcg-interpreter and know we're not just
# printing the help message, bail out if the host CPU isn't supported.
if test "$ARCH" = "unknown"; then