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dnl FRR Python autoconf magic
dnl 2019 David Lamparter for NetDEF, Inc.
dnl SPDX-License-Identifier: GPL-2.0-or-later
dnl the _ at the beginning will be cut off (to support the empty version string)
m4_define_default([_FRR_PY_VERS], [_3 _3.10 _3.9 _3.8 _3.7 _3.6 _3.5 _3.4 _3.3 _3.2 _ _2 _2.7])
dnl check basic interpreter properties (py2/py3)
dnl doubles as simple check whether the interpreter actually works
dnl also swaps in the full path to the interpreter
dnl arg1: if-true, arg2: if-false
AC_DEFUN([_FRR_PYTHON_INTERP], [dnl
AC_ARG_VAR([PYTHON], [Python interpreter to use])dnl
AC_MSG_CHECKING([python interpreter $PYTHON])
AC_RUN_LOG(["$PYTHON" -c 'import sys; open("conftest.pyver", "w").write(sys.executable or ""); sys.exit(not (sys.version_info.major == 2 and sys.version_info.minor >= 7))'])
py2=$ac_status
_py2_full="`cat conftest.pyver 2>/dev/null`"
rm -f "conftest.pyver" >/dev/null 2>/dev/null
AC_RUN_LOG(["$PYTHON" -c 'import sys; open("conftest.pyver", "w").write(sys.executable or ""); sys.exit(not ((sys.version_info.major == 3 and sys.version_info.minor >= 2) or sys.version_info.major > 3))'])
py3=$ac_status
_py3_full="`cat conftest.pyver 2>/dev/null`"
rm -f "conftest.pyver" >/dev/null 2>/dev/null
case "p${py2}p${py3}" in
p0p1) frr_cv_python=python2
_python_full="$_py2_full" ;;
p1p0) frr_cv_python=python3
_python_full="$_py3_full" ;;
*) frr_cv_python=none ;;
esac
if test "$frr_cv_python" = none; then
AC_MSG_RESULT([not working])
$2
else
test -n "$_python_full" -a -x "$_python_full" && PYTHON="$_python_full"
AC_MSG_RESULT([$PYTHON ($frr_cv_python)])
$1
fi
dnl return value
test "$frr_cv_python" != none
])
dnl check whether $PYTHON has modules available
dnl arg1: list of modules (space separated)
dnl arg2: if all true, arg3: if any missing
dnl also sets frr_py_mod_<name> to "true" or "false"
AC_DEFUN([FRR_PYTHON_MODULES], [
result=true
for pymod in $1; do
AC_MSG_CHECKING([whether $PYTHON module $pymod is available])
AC_RUN_LOG(["$PYTHON" -c "import $pymod"])
sane="`echo \"$pymod\" | tr -c '[a-zA-Z0-9\n]' '_'`"
if test "$ac_status" -eq 0; then
AC_MSG_RESULT([yes])
eval frr_py_mod_$sane=true
else
AC_MSG_RESULT([no])
eval frr_py_mod_$sane=false
result=false
fi
done
if $result; then
m4_default([$2], [:])
else
m4_default([$3], [:])
fi
$result
])
dnl check whether $PYTHON has modules available
dnl arg1: list of modules (space separated)
dnl arg2: command line parameters for executing
dnl arg3: if all true, arg4: if any missing
dnl also sets frr_py_modexec_<name> to "true" or "false"
AC_DEFUN([FRR_PYTHON_MOD_EXEC], [
result=true
for pymod in $1; do
AC_MSG_CHECKING([whether $PYTHON module $pymod is executable])
AC_RUN_LOG(["$PYTHON" -m "$pymod" $2 > /dev/null])
sane="`echo \"$pymod\" | tr -c '[a-zA-Z0-9\n]' '_'`"
if test "$ac_status" -eq 0; then
AC_MSG_RESULT([yes])
eval frr_py_modexec_$sane=true
else
AC_MSG_RESULT([no])
eval frr_py_modexec_$sane=false
result=false
fi
done
if $result; then
m4_default([$3], [:])
else
m4_default([$4], [:])
fi
$result
])
dnl check whether we can build & link python bits
dnl input: PYTHON_CFLAGS and PYTHON_LIBS
AC_DEFUN([_FRR_PYTHON_DEVENV], [
result=true
AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([
#include <Python.h>
#if PY_VERSION_HEX < 0x02070000
#error python too old
#endif
int main(void);
],
[
{
Py_Initialize();
return 0;
}
])], [
# some python installs are missing the zlib dependency...
PYTHON_LIBS="${PYTHON_LIBS} -lz"
AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([
#include <Python.h>
#if PY_VERSION_HEX < 0x02070000
#error python too old
#endif
int main(void);
],
[
{
Py_Initialize();
return 0;
}
])], [
result=false
AC_MSG_RESULT([no])
], [:])
], [:])
if $result; then
AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([
#include <Python.h>
#if PY_VERSION_HEX != $1
#error python version mismatch
#endif
int main(void);
],
[
{
Py_Initialize();
return 0;
}
])], [
result=false
AC_MSG_RESULT([version mismatch])
], [
AC_MSG_RESULT([yes])
])
fi
if $result; then
m4_default([$2], [:])
else
m4_default([$3], [
unset PYTHON_LIBS
unset PYTHON_CFLAGS
])
fi
])
AC_DEFUN([_FRR_PYTHON_GETDEV], [dnl
AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
py_abi="` \"$1\" -c \"import sys; print(getattr(sys, 'abiflags', ''))\"`"
py_hex="` \"$1\" -c \"import sys; print(hex(sys.hexversion))\"`"
py_ldver="` \"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('LDVERSION') or '')\"`"
py_ver="` \"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('VERSION') or '')\"`"
py_bindir="`\"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('BINDIR') or '')\"`"
test -z "$py_bindir" || py_bindir="$py_bindir/"
echo "py_abi=${py_abi} py_ldver=${py_ldver} py_ver=${py_ver} py_bindir=${py_bindir}" >&AS_MESSAGE_LOG_FD
py_found=false
for tryver in "${py_ldver}" "${py_ver}"; do
pycfg="${py_bindir}python${tryver}-config"
AC_MSG_CHECKING([whether ${pycfg} is available])
if "$pycfg" --configdir >/dev/null 2>/dev/null; then
AC_MSG_RESULT([yes])
PYTHON_CFLAGS="`\"$pycfg\" --includes`"
if test x"${py_ver}" = x"3.8" || test x"{py_ver}" = x"3.9"; then
PYTHON_LIBS="`\"$pycfg\" --ldflags --embed`"
else
PYTHON_LIBS="`\"$pycfg\" --ldflags`"
fi
AC_MSG_CHECKING([whether ${pycfg} provides a working build environment])
_FRR_PYTHON_DEVENV([$py_hex], [
py_found=true
break
])
else
AC_MSG_RESULT([no])
fi
pkg_failed=no
AC_MSG_CHECKING([whether pkg-config python-${tryver} is available])
unset PYTHON_CFLAGS
unset PYTHON_LIBS
pkg="python-${tryver}"
pkg="${pkg%-}"
_PKG_CONFIG([PYTHON_CFLAGS], [cflags], [${pkg}])
_PKG_CONFIG([PYTHON_LIBS], [libs], [${pkg}])
if test $pkg_failed = no; then
AC_MSG_RESULT([yes])
PYTHON_CFLAGS=$pkg_cv_PYTHON_CFLAGS
PYTHON_LIBS=$pkg_cv_PYTHON_LIBS
AC_MSG_CHECKING([whether pkg-config python-${tryver} provides a working build environment])
_FRR_PYTHON_DEVENV([$py_hex], [
py_found=true
break
])
else
AC_MSG_RESULT([no])
fi
done
if $py_found; then
m4_default([$2], [:])
else
unset PYTHON_CFLAGS
unset PYTHON_LIBS
m4_default([$3], [:])
fi
])
dnl just find python without checking headers/libs
AC_DEFUN([FRR_PYTHON], [
dnl user override
if test "x$PYTHON" != "x"; then
_FRR_PYTHON_INTERP([], [
AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but not working])
])
else
for frr_pyver in _FRR_PY_VERS; do
PYTHON="python${frr_pyver#_}"
_FRR_PYTHON_INTERP([break])
PYTHON=":"
done
if test "$PYTHON" = ":"; then
AC_MSG_ERROR([no working python version found])
fi
fi
AC_SUBST([PYTHON])
])
dnl find python with checking headers/libs
AC_DEFUN([FRR_PYTHON_DEV], [dnl
AC_ARG_VAR([PYTHON_CFLAGS], [C compiler flags for Python])dnl
AC_ARG_VAR([PYTHON_LIBS], [linker flags for Python])dnl
dnl user override
if test "x$PYTHON" != "x"; then
_FRR_PYTHON_INTERP([], [
AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but not working])
])
_FRR_PYTHON_GETDEV([$PYTHON], [], [
AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but development environment not working])
])
else
for frr_pyver in _FRR_PY_VERS; do
PYTHON="python${frr_pyver#_}"
_FRR_PYTHON_INTERP([
_FRR_PYTHON_GETDEV([$PYTHON], [
break
])
])
PYTHON=":"
done
if test "$PYTHON" = ":"; then
AC_MSG_ERROR([no working python version found])
fi
fi
AC_SUBST([PYTHON_CFLAGS])
AC_SUBST([PYTHON_LIBS])
AC_SUBST([PYTHON])
])
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