xref: /freebsd/sys/contrib/openzfs/config/always-python.m4 (revision e9e8876a4d6afc1ad5315faaa191b25121a813d7)
1dnl #
2dnl # The majority of the python scripts are written to be compatible
3dnl # with Python 2.6 and Python 3.4.  Therefore, they may be installed
4dnl # and used with either interpreter.  This option is intended to
5dnl # to provide a method to specify the default system version, and
6dnl # set the PYTHON environment variable accordingly.
7dnl #
8AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_PYTHON], [
9	AC_ARG_WITH([python],
10		AS_HELP_STRING([--with-python[=VERSION]],
11		[default system python version @<:@default=check@:>@]),
12		[with_python=$withval],
13		[with_python=check])
14
15	AS_CASE([$with_python],
16		[check], [AC_CHECK_PROGS([PYTHON], [python3 python2], [:])],
17		[2*], [PYTHON="python${with_python}"],
18		[*python2*], [PYTHON="${with_python}"],
19		[3*], [PYTHON="python${with_python}"],
20		[*python3*], [PYTHON="${with_python}"],
21		[no], [PYTHON=":"],
22		[AC_MSG_ERROR([Unknown --with-python value '$with_python'])]
23	)
24
25	dnl #
26	dnl # Minimum supported Python versions for utilities:
27	dnl # Python 2.6 or Python 3.4
28	dnl #
29	AM_PATH_PYTHON([], [], [:])
30	AS_IF([test -z "$PYTHON_VERSION"], [
31		PYTHON_VERSION=$(echo ${PYTHON##*/} | tr -cd 0-9.)
32	])
33	PYTHON_MINOR=${PYTHON_VERSION#*\.}
34
35	AS_CASE([$PYTHON_VERSION],
36		[2.*], [
37			AS_IF([test $PYTHON_MINOR -lt 6],
38				[AC_MSG_ERROR("Python >= 2.6 is required")])
39		],
40		[3.*], [
41			AS_IF([test $PYTHON_MINOR -lt 4],
42				[AC_MSG_ERROR("Python >= 3.4 is required")])
43		],
44		[:|2|3], [],
45		[PYTHON_VERSION=3]
46	)
47
48	AM_CONDITIONAL([USING_PYTHON], [test "$PYTHON" != :])
49	AM_CONDITIONAL([USING_PYTHON_2], [test "x${PYTHON_VERSION%%\.*}" = x2])
50	AM_CONDITIONAL([USING_PYTHON_3], [test "x${PYTHON_VERSION%%\.*}" = x3])
51
52	AM_COND_IF([USING_PYTHON_2],
53		[AC_SUBST([PYTHON_SHEBANG], [python2])],
54		[AC_SUBST([PYTHON_SHEBANG], [python3])])
55
56	dnl #
57	dnl # Request that packages be built for a specific Python version.
58	dnl #
59	AS_IF([test "x$with_python" != xcheck], [
60		PYTHON_PKG_VERSION=$(echo $PYTHON_VERSION | tr -d .)
61		DEFINE_PYTHON_PKG_VERSION='--define "__use_python_pkg_version '${PYTHON_PKG_VERSION}'"'
62		DEFINE_PYTHON_VERSION='--define "__use_python '${PYTHON}'"'
63	], [
64		DEFINE_PYTHON_VERSION=''
65		DEFINE_PYTHON_PKG_VERSION=''
66	])
67
68	AC_SUBST(DEFINE_PYTHON_VERSION)
69	AC_SUBST(DEFINE_PYTHON_PKG_VERSION)
70])
71