lustre/autoconf/ac_python_devel.m4

   1 # ===========================================================================
   2 #     https://www.gnu.org/software/autoconf-archive/ax_python_devel.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_PYTHON_DEVEL([version])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
  12 #   in your configure.ac.
  13 #
  14 #   This macro checks for Python and tries to get the include path to
  15 #   'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LIBS) output
  16 #   variables. It also exports $(PYTHON_EXTRA_LIBS) and
  17 #   $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
  18 #
  19 #   You can search for some particular version of Python by passing a
  20 #   parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
  21 #   note that you *have* to pass also an operator along with the version to
  22 #   match, and pay special attention to the single quotes surrounding the
  23 #   version number. Don't use "PYTHON_VERSION" for this: that environment
  24 #   variable is declared as precious and thus reserved for the end-user.
  25 #
  26 #   This macro should work for all versions of Python >= 2.1.0. As an end
  27 #   user, you can disable the check for the python version by setting the
  28 #   PYTHON_NOVERSIONCHECK environment variable to something else than the
  29 #   empty string.
  30 #
  31 #   If you need to use this macro for an older Python version, please
  32 #   contact the authors. We're always open for feedback.
  33 #
  34 # LICENSE
  35 #
  36 #   Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
  37 #   Copyright (c) 2009 Alan W. Irwin
  38 #   Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
  39 #   Copyright (c) 2009 Andrew Collier
  40 #   Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
  41 #   Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
  42 #   Copyright (c) 2013 Daniel Mullner <muellner@math.stanford.edu>
  43 #
  44 #   This program is free software: you can redistribute it and/or modify it
  45 #   under the terms of the GNU General Public License as published by the
  46 #   Free Software Foundation, either version 3 of the License, or (at your
  47 #   option) any later version.
  48 #
  49 #   This program is distributed in the hope that it will be useful, but
  50 #   WITHOUT ANY WARRANTY; without even the implied warranty of
  51 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  52 #   Public License for more details.
  53 #
  54 #   You should have received a copy of the GNU General Public License along
  55 #   with this program. If not, see <https://www.gnu.org/licenses/>.
  56 #
  57 #   As a special exception, the respective Autoconf Macro's copyright owner
  58 #   gives unlimited permission to copy, distribute and modify the configure
  59 #   scripts that are the output of Autoconf when processing the Macro. You
  60 #   need not follow the terms of the GNU General Public License when using
  61 #   or distributing such scripts, even though portions of the text of the
  62 #   Macro appear in them. The GNU General Public License (GPL) does govern
  63 #   all other use of the material that constitutes the Autoconf Macro.
  64 #
  65 #   This special exception to the GPL applies to versions of the Autoconf
  66 #   Macro released by the Autoconf Archive. When you make and distribute a
  67 #   modified version of the Autoconf Macro, you may extend this special
  68 #   exception to the GPL to apply to your modified version as well.
  69
  70 #serial 21
  71
  72 AU_ALIAS([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])
  73 AC_DEFUN([AX_PYTHON_DEVEL],[
  74         #
  75         # Allow the use of a (user set) custom python version
  76         #
  77         #AC_ARG_VAR([PYTHON_VERSION],[The installed Python
  78         #       version to use, for example '2.3'. This string
  79         #       will be appended to the Python interpreter
  80         #       canonical name.])
  81
  82         AC_PATH_PROGS([PYTHON],[python3 python])
  83         #AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
  84         if test -z "$PYTHON"; then
  85            #AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
  86            AC_MSG_WARN([Cannot find python in your system path])
  87            PYTHON_VERSION_CHECK="no"
  88            AC_SUBST([PYTHON_VERSION_CHECK])
  89            PYTHON_VERSION=""
  90         fi
  91
  92         PYTHON_VERSION_CHECK="yes"
  93         #
  94         # Check for a version of Python >= 2.1.0
  95         #
  96         AC_MSG_CHECKING([for a version of Python >= '3.6.0'])
  97         ac_supports_python_ver=`$PYTHON -c "import sys; \
  98                 ver = sys.version.split ()[[0]]; \
  99                 print (ver >= '3.0')"`
 100         if test "$ac_supports_python_ver" != "True"; then
 101                 if test -z "$PYTHON_NOVERSIONCHECK"; then
 102                         AC_MSG_RESULT([no])
 103                         PYTHON_VERSION_CHECK="no"
 104                         AC_SUBST([PYTHON_VERSION_CHECK])
 105                         AC_MSG_WARN([
 106 This version of the AC@&t@_PYTHON_DEVEL macro
 107 doesn't work properly with versions of Python before
 108 3.6.0. You may need to re-run configure, setting the
 109 variables PYTHON_CPPFLAGS, PYTHON_LIBS, PYTHON_SITE_PKG,
 110 PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
 111 Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
 112 to something else than an empty string.
 113 ])
 114                 else
 115                         AC_MSG_RESULT([skip at user request])
 116                 fi
 117         else
 118                 AC_MSG_RESULT([yes])
 119         fi
 120
 121         #
 122         # if the macro parameter ``version'' is set, honour it
 123         #
 124         if test -n "$1" ; then
 125                 AC_MSG_CHECKING([for a version of Python $1])
 126                 ac_supports_python_ver=`$PYTHON -c "import sys; \
 127                         ver = sys.version.split ()[[0]]; \
 128                         print (ver $1)"`
 129                 if test "$ac_supports_python_ver" = "True"; then
 130                    AC_MSG_RESULT([yes])
 131                 else
 132                         AC_MSG_RESULT([no])
 133                         PYTHON_VERSION_CHECK="no"
 134                         AC_SUBST([PYTHON_VERSION_CHECK])
 135                         AC_MSG_WARN([this package requires Python $1.
 136 If you have it installed, but it isn't the default Python
 137 interpreter in your system path, please pass the PYTHON_VERSION
 138 variable to configure. See ``configure --help'' for reference.
 139 ])
 140                         PYTHON_VERSION=""
 141                 fi
 142         fi
 143
 144         #
 145         # Check if you have distutils, else fail
 146         #
 147         if test "yes" = "$PYTHON_VERSION_CHECK" ; then
 148                 AC_MSG_CHECKING([for the distutils Python package])
 149                 ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
 150                 if test $? -eq 0; then
 151                         AC_MSG_RESULT([yes])
 152                 else
 153                         AC_MSG_RESULT([no])
 154                         PYTHON_VERSION_CHECK="no"
 155                         AC_SUBST([PYTHON_VERSION_CHECK])
 156                         AC_MSG_WARN([cannot import Python module "distutils".
 157         Please check your Python installation. The error was:
 158         $ac_distutils_result])
 159                         PYTHON_VERSION=""
 160                 fi
 161
 162                 #
 163                 # Check for Python include path
 164                 #
 165                 AC_MSG_CHECKING([for Python include path])
 166                 if test -z "$PYTHON_CPPFLAGS"; then
 167                         python_path=`$PYTHON -c "import distutils.sysconfig; \
 168                                 print (distutils.sysconfig.get_python_inc ());"`
 169                         plat_python_path=`$PYTHON -c "import distutils.sysconfig; \
 170                                 print (distutils.sysconfig.get_python_inc (plat_specific=1));"`
 171                         if test -n "${python_path}"; then
 172                                 if test "${plat_python_path}" != "${python_path}"; then
 173                                         python_path="-I$python_path -I$plat_python_path"
 174                                 else
 175                                         python_path="-I$python_path"
 176                                 fi
 177                         fi
 178                         PYTHON_CPPFLAGS=$python_path
 179                 fi
 180                 AC_MSG_RESULT([$PYTHON_CPPFLAGS])
 181                 AC_SUBST([PYTHON_CPPFLAGS])
 182
 183                 #
 184                 # Check for Python library path
 185                 #
 186                 AC_MSG_CHECKING([for Python library path])
 187                 if test -z "$PYTHON_LIBS"; then
 188                         # (makes two attempts to ensure we've got a version number
 189                         # from the interpreter)
 190                         ac_python_version=`cat<<EOD | $PYTHON -
 191
 192 # join all versioning strings, on some systems
 193 # major/minor numbers could be in different list elements
 194 from distutils.sysconfig import *
 195 e = get_config_var('VERSION')
 196 if e is not None:
 197         print(e)
 198 EOD`
 199
 200                         if test -z "$ac_python_version"; then
 201                                 if test -n "$PYTHON_VERSION"; then
 202                                         ac_python_version=$PYTHON_VERSION
 203                                 else
 204                                         ac_python_version=`$PYTHON -c "import sys; \
 205                                                 print (sys.version[[:3]])"`
 206                                 fi
 207                         fi
 208
 209                         # Make the versioning information available to the compiler
 210                         AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
 211                                         [If available, contains the Python version number currently in use.])
 212
 213                         # First, the library directory:
 214                         ac_python_libdir=`cat<<EOD | $PYTHON -
 215
 216 # There should be only one
 217 import distutils.sysconfig
 218 e = distutils.sysconfig.get_config_var('LIBDIR')
 219 if e is not None:
 220         print (e)
 221 EOD`
 222
 223                         # Now, for the library:
 224                         ac_python_library=`cat<<EOD | $PYTHON -
 225
 226 import distutils.sysconfig
 227 c = distutils.sysconfig.get_config_vars()
 228 if 'LDVERSION' in c:
 229         print ('python'+c[['LDVERSION']])
 230 else:
 231         print ('python'+c[['VERSION']])
 232 EOD`
 233
 234                         # This small piece shamelessly adapted from PostgreSQL python macro;
 235                         # credits goes to momjian, I think. I'd like to put the right name
 236                         # in the credits, if someone can point me in the right direction... ?
 237                         #
 238                         if test -n "$ac_python_libdir" -a -n "$ac_python_library"
 239                         then
 240                                 # use the official shared library
 241                                 ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
 242                                 PYTHON_LIBS="-L$ac_python_libdir -l$ac_python_library"
 243                         else
 244                                 # old way: use libpython from python_configdir
 245                                 ac_python_libdir=`$PYTHON -c \
 246                                 "from distutils.sysconfig import get_python_lib as f; \
 247                                 import os; \
 248                                 print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
 249                                 PYTHON_LIBS="-L$ac_python_libdir -lpython$ac_python_version"
 250                         fi
 251
 252                         if test -z "PYTHON_LIBS"; then
 253                                 PYTHON_VERSION_CHECK="no"
 254                                 AC_SUBST([PYTHON_VERSION_CHECK])
 255                                 AC_MSG_WARN([
 256         Cannot determine location of your Python DSO. Please check it was installed with
 257         dynamic libraries enabled, or try setting PYTHON_LIBS by hand.
 258                                 ])
 259                         fi
 260                 fi
 261                 AC_MSG_RESULT([$PYTHON_LIBS])
 262                 AC_SUBST([PYTHON_LIBS])
 263
 264                 #
 265                 # Check for site packages
 266                 #
 267                 AC_MSG_CHECKING([for Python site-packages path])
 268                 if test -z "$PYTHON_SITE_PKG"; then
 269                         PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
 270                                 print (distutils.sysconfig.get_python_lib(0,0));"`
 271                 fi
 272                 AC_MSG_RESULT([$PYTHON_SITE_PKG])
 273                 AC_SUBST([PYTHON_SITE_PKG])
 274
 275                 #
 276                 # libraries which must be linked in when embedding
 277                 #
 278                 AC_MSG_CHECKING(python extra libraries)
 279                 if test -z "$PYTHON_EXTRA_LIBS"; then
 280                 PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
 281                         conf = distutils.sysconfig.get_config_var; \
 282                         print (conf('LIBS') + ' ' + conf('SYSLIBS'))"`
 283                 fi
 284                 AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
 285                 AC_SUBST(PYTHON_EXTRA_LIBS)
 286
 287                 #
 288                 # linking flags needed when embedding
 289                 #
 290                 AC_MSG_CHECKING(python extra linking flags)
 291                 if test -z "$PYTHON_EXTRA_LDFLAGS"; then
 292                         PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
 293                                 conf = distutils.sysconfig.get_config_var; \
 294                                 print (conf('LINKFORSHARED'))"`
 295                 fi
 296                 AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
 297                 AC_SUBST(PYTHON_EXTRA_LDFLAGS)
 298
 299                 #
 300                 # final check to see if everything compiles alright
 301                 #
 302                 AC_MSG_CHECKING([consistency of all components of python development environment])
 303                 # save current global flags
 304                 ac_save_LIBS="$LIBS"
 305                 ac_save_LDFLAGS="$LDFLAGS"
 306                 ac_save_CPPFLAGS="$CPPFLAGS"
 307                 LIBS="$ac_save_LIBS $PYTHON_LIBS $PYTHON_EXTRA_LIBS $PYTHON_EXTRA_LIBS"
 308                 LDFLAGS="$ac_save_LDFLAGS $PYTHON_EXTRA_LDFLAGS"
 309                 CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
 310                 AC_LANG_PUSH([C])
 311                 AC_LINK_IFELSE([
 312                         AC_LANG_PROGRAM([[#include <Python.h>]],
 313                                         [[Py_Initialize();]])
 314                         ],[pythonexists=yes],[pythonexists=no])
 315                 AC_LANG_POP([C])
 316                 # turn back to default flags
 317                 CPPFLAGS="$ac_save_CPPFLAGS"
 318                 LIBS="$ac_save_LIBS"
 319                 LDFLAGS="$ac_save_LDFLAGS"
 320
 321                 AC_MSG_RESULT([$pythonexists])
 322
 323                 if test ! "x$pythonexists" = "xyes"; then
 324                 PYTHON_VERSION_CHECK="no"
 325                 AC_SUBST([PYTHON_VERSION_CHECK])
 326                 AC_MSG_WARN([
 327         Could not link test program to Python. Maybe the main Python library has been
 328         installed in some non-standard library path. If so, pass it to configure,
 329         via the LIBS environment variable.
 330         Example: ./configure LIBS="-L/usr/non-standard-path/python/lib"
 331         ============================================================================
 332         ERROR!
 333         You probably have to install the development version of the Python package
 334         for your distribution.  The exact name of this package varies among them.
 335         ============================================================================
 336                 ])
 337                 PYTHON_VERSION=""
 338                 fi
 339         fi
 340         #
 341         # all done!
 342         #
 343 ])