[mirror_frr.git] / m4 / ax_python.m4

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 _ _2 _3.7 _3.6 _3.5 _3.4 _3.3 _3.2 _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])
])
Commit	Line	Data
45da32d7 DL	1	dnl FRR Python autoconf magic
	2	dnl 2019 David Lamparter for NetDEF, Inc.
	3	dnl SPDX-License-Identifier: GPL-2.0-or-later
	4
	5	dnl the _ at the beginning will be cut off (to support the empty version string)
	6	m4_define_default([_FRR_PY_VERS], [_3 _ _2 _3.7 _3.6 _3.5 _3.4 _3.3 _3.2 _2.7])
	7
	8	dnl check basic interpreter properties (py2/py3)
	9	dnl doubles as simple check whether the interpreter actually works
	10	dnl also swaps in the full path to the interpreter
	11	dnl arg1: if-true, arg2: if-false
	12	AC_DEFUN([_FRR_PYTHON_INTERP], [dnl
	13	AC_ARG_VAR([PYTHON], [Python interpreter to use])dnl
	14	AC_MSG_CHECKING([python interpreter $PYTHON])
	15	AC_RUN_LOG(["$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))'])
	16	py2=$ac_status
	17	_py2_full="`cat conftest.pyver 2>/dev/null`"
	18	rm -f "conftest.pyver" >/dev/null 2>/dev/null
	19
	20	AC_RUN_LOG(["$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))'])
	21	py3=$ac_status
	22	_py3_full="`cat conftest.pyver 2>/dev/null`"
	23	rm -f "conftest.pyver" >/dev/null 2>/dev/null
	24
	25	case "p${py2}p${py3}" in
	26	p0p1) frr_cv_python=python2
	27	_python_full="$_py2_full" ;;
	28	p1p0) frr_cv_python=python3
	29	_python_full="$_py3_full" ;;
	30	*) frr_cv_python=none ;;
	31	esac
	32
	33	if test "$frr_cv_python" = none; then
	34	AC_MSG_RESULT([not working])
	35	$2
	36	else
	37	test -n "$_python_full" -a -x "$_python_full" && PYTHON="$_python_full"
	38	AC_MSG_RESULT([$PYTHON ($frr_cv_python)])
	39	$1
	40	fi
	41
	42	dnl return value
	43	test "$frr_cv_python" != none
	44	])
	45
	46	dnl check whether $PYTHON has modules available
	47	dnl arg1: list of modules (space separated)
	48	dnl arg2: if all true, arg3: if any missing
	49	dnl also sets frr_py_mod_<name> to "true" or "false"
	50	AC_DEFUN([FRR_PYTHON_MODULES], [
	51	result=true
	52	for pymod in $1; do
	53	AC_MSG_CHECKING([whether $PYTHON module $pymod is available])
	54	AC_RUN_LOG(["$PYTHON" -c "import $pymod"])
	55	sane="`echo \"$pymod\" \| tr -c '[a-zA-Z0-9\n]' '_'`"
	56	if test "$ac_status" -eq 0; then
	57	AC_MSG_RESULT([yes])
	58	eval frr_py_mod_$sane=true
	59	else
	60	AC_MSG_RESULT([no])
	61	eval frr_py_mod_$sane=false
	62	result=false
	63	fi
	64	done
65	if $result; then
66	m4_default([$2], [:])
67	else
68	m4_default([$3], [:])
69	fi
70	$result
71	])
72
73	dnl check whether $PYTHON has modules available
74	dnl arg1: list of modules (space separated)
75	dnl arg2: command line parameters for executing
76	dnl arg3: if all true, arg4: if any missing
77	dnl also sets frr_py_modexec_<name> to "true" or "false"
78	AC_DEFUN([FRR_PYTHON_MOD_EXEC], [
79	result=true
80	for pymod in $1; do
81	AC_MSG_CHECKING([whether $PYTHON module $pymod is executable])
82	AC_RUN_LOG(["$PYTHON" -m "$pymod" $2 > /dev/null])
83	sane="`echo \"$pymod\" \| tr -c '[a-zA-Z0-9\n]' '_'`"
84	if test "$ac_status" -eq 0; then
85	AC_MSG_RESULT([yes])
86	eval frr_py_modexec_$sane=true
87	else
88	AC_MSG_RESULT([no])
89	eval frr_py_modexec_$sane=false
90	result=false
91	fi
92	done
93	if $result; then
94	m4_default([$3], [:])
95	else
96	m4_default([$4], [:])
97	fi
98	$result
99	])
100
101	dnl check whether we can build & link python bits
102	dnl input: PYTHON_CFLAGS and PYTHON_LIBS
103	AC_DEFUN([_FRR_PYTHON_DEVENV], [
104	result=true
105	AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([
106	#include <Python.h>
107	#if PY_VERSION_HEX < 0x02070000
108	#error python too old
109	#endif
110	int main(void);
111	],
112	[
113	{
114	Py_Initialize();
115	return 0;
116	}
117	])], [
118	# some python installs are missing the zlib dependency...
119	PYTHON_LIBS="${PYTHON_LIBS} -lz"
120	AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([
121	#include <Python.h>
122	#if PY_VERSION_HEX < 0x02070000
123	#error python too old
124	#endif
125	int main(void);
126	],
127	[
128	{
129	Py_Initialize();
130	return 0;
131	}
132	])], [
133	result=false
134	AC_MSG_RESULT([no])
135	], [:])
136	], [:])
137
138	if $result; then
139	AC_LINK_IFELSE_FLAGS([$PYTHON_CFLAGS], [$PYTHON_LIBS], [AC_LANG_PROGRAM([
140	#include <Python.h>
141	#if PY_VERSION_HEX != $1
142	#error python version mismatch
143	#endif
144	int main(void);
145	],
146	[
147	{
148	Py_Initialize();
149	return 0;
150	}
151	])], [
152	result=false
153	AC_MSG_RESULT([version mismatch])
154	], [
155	AC_MSG_RESULT([yes])
156	])
157	fi
158
159	if $result; then
160	m4_default([$2], [:])
161	else
162	m4_default([$3], [
163	unset PYTHON_LIBS
164	unset PYTHON_CFLAGS
165	])
166	fi
167	])
168
169	AC_DEFUN([_FRR_PYTHON_GETDEV], [dnl
170	AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
171
172	py_abi="` \"$1\" -c \"import sys; print(getattr(sys, 'abiflags', ''))\"`"
173	py_hex="` \"$1\" -c \"import sys; print(hex(sys.hexversion))\"`"
174	py_ldver="` \"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('LDVERSION') or '')\"`"
175	py_ver="` \"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('VERSION') or '')\"`"
176	py_bindir="`\"$1\" -c \"import sysconfig; print(sysconfig.get_config_var('BINDIR') or '')\"`"
177	test -z "$py_bindir" \|\| py_bindir="$py_bindir/"
178	echo "py_abi=${py_abi} py_ldver=${py_ldver} py_ver=${py_ver} py_bindir=${py_bindir}" >&AS_MESSAGE_LOG_FD
179
180	py_found=false
181
182	for tryver in "${py_ldver}" "${py_ver}"; do
183	pycfg="${py_bindir}python${tryver}-config"
184	AC_MSG_CHECKING([whether ${pycfg} is available])
185	if "$pycfg" --configdir >/dev/null 2>/dev/null; then
186	AC_MSG_RESULT([yes])
187
188	PYTHON_CFLAGS="`\"$pycfg\" --includes`"
9c1be105	189	if test x"${py_ver}" = x"3.8" \|\| test x"{py_ver}" = x"3.9"; then
6914937e MR	190	PYTHON_LIBS="`\"$pycfg\" --ldflags --embed`"
	191	else
	192	PYTHON_LIBS="`\"$pycfg\" --ldflags`"
	193	fi
45da32d7 DL	194
	195	AC_MSG_CHECKING([whether ${pycfg} provides a working build environment])
	196	_FRR_PYTHON_DEVENV([$py_hex], [
	197	py_found=true
	198	break
	199	])
	200	else
	201	AC_MSG_RESULT([no])
	202	fi
	203
	204	pkg_failed=no
	205	AC_MSG_CHECKING([whether pkg-config python-${tryver} is available])
	206	unset PYTHON_CFLAGS
	207	unset PYTHON_LIBS
	208	pkg="python-${tryver}"
	209	pkg="${pkg%-}"
	210	_PKG_CONFIG([PYTHON_CFLAGS], [cflags], [${pkg}])
	211	_PKG_CONFIG([PYTHON_LIBS], [libs], [${pkg}])
	212	if test $pkg_failed = no; then
	213	AC_MSG_RESULT([yes])
	214
	215	PYTHON_CFLAGS=$pkg_cv_PYTHON_CFLAGS
	216	PYTHON_LIBS=$pkg_cv_PYTHON_LIBS
	217
	218	AC_MSG_CHECKING([whether pkg-config python-${tryver} provides a working build environment])
	219	_FRR_PYTHON_DEVENV([$py_hex], [
	220	py_found=true
	221	break
	222	])
	223	else
	224	AC_MSG_RESULT([no])
	225	fi
	226	done
	227
	228	if $py_found; then
	229	m4_default([$2], [:])
	230	else
	231	unset PYTHON_CFLAGS
	232	unset PYTHON_LIBS
	233	m4_default([$3], [:])
	234	fi
	235	])
	236
	237	dnl just find python without checking headers/libs
	238	AC_DEFUN([FRR_PYTHON], [
	239	dnl user override
	240	if test "x$PYTHON" != "x"; then
	241	_FRR_PYTHON_INTERP([], [
	242	AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but not working])
	243	])
	244	else
	245	for frr_pyver in _FRR_PY_VERS; do
	246	PYTHON="python${frr_pyver#_}"
	247	_FRR_PYTHON_INTERP([break])
	248	PYTHON=":"
	249	done
	250	if test "$PYTHON" = ":"; then
	251	AC_MSG_ERROR([no working python version found])
	252	fi
	253	fi
	254	AC_SUBST([PYTHON])
	255	])
	256
	257	dnl find python with checking headers/libs
258	AC_DEFUN([FRR_PYTHON_DEV], [dnl
259	AC_ARG_VAR([PYTHON_CFLAGS], [C compiler flags for Python])dnl
260	AC_ARG_VAR([PYTHON_LIBS], [linker flags for Python])dnl
261
262	dnl user override
263	if test "x$PYTHON" != "x"; then
264	_FRR_PYTHON_INTERP([], [
265	AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but not working])
266	])
267	_FRR_PYTHON_GETDEV([$PYTHON], [], [
268	AC_MSG_ERROR([PYTHON ($PYTHON) explicitly specified but development environment not working])
269	])
270	else
271	for frr_pyver in _FRR_PY_VERS; do
272	PYTHON="python${frr_pyver#_}"
273	_FRR_PYTHON_INTERP([
274	_FRR_PYTHON_GETDEV([$PYTHON], [
275	break
276	])
277	])
278	PYTHON=":"
279	done
280	if test "$PYTHON" = ":"; then
281	AC_MSG_ERROR([no working python version found])
282	fi
283	fi
284
285	AC_SUBST([PYTHON_CFLAGS])
286	AC_SUBST([PYTHON_LIBS])
287	AC_SUBST([PYTHON])
288	])