config/python.m4

   1 #
   2 # Autoconf macros for configuring the build of Python extension modules
   3 #
   4 # $PostgreSQL$
   5 #
   6
   7 # PGAC_PATH_PYTHON
   8 # ----------------
   9 # Look for Python and set the output variable 'PYTHON'
  10 # to 'python' if found, empty otherwise.
  11 AC_DEFUN([PGAC_PATH_PYTHON],
  12 [AC_PATH_PROG(PYTHON, python)
  13 if test x"$PYTHON" = x""; then
  14   AC_MSG_ERROR([Python not found])
  15 fi
  16 ])
  17
  18
  19 # _PGAC_CHECK_PYTHON_DIRS
  20 # -----------------------
  21 # Determine the name of various directories of a given Python installation.
  22 AC_DEFUN([_PGAC_CHECK_PYTHON_DIRS],
  23 [AC_REQUIRE([PGAC_PATH_PYTHON])
  24 AC_MSG_CHECKING([for Python distutils module])
  25 if "${PYTHON}" 2>&- -c 'import distutils'
  26 then
  27     AC_MSG_RESULT(yes)
  28 else
  29     AC_MSG_RESULT(no)
  30     AC_MSG_ERROR([distutils module not found])
  31 fi
  32 AC_MSG_CHECKING([Python configuration directory])
  33 python_version=`${PYTHON} -c "import sys; print(sys.version[[:3]])"`
  34 python_configdir=`${PYTHON} -c "from distutils.sysconfig import get_python_lib as f; import os; print(os.path.join(f(plat_specific=1,standard_lib=1),'config'))"`
  35 python_includespec=`${PYTHON} -c "import distutils.sysconfig; print('-I'+distutils.sysconfig.get_python_inc())"`
  36
  37 AC_SUBST(python_version)[]dnl
  38 AC_SUBST(python_configdir)[]dnl
  39 AC_SUBST(python_includespec)[]dnl
  40 # This should be enough of a message.
  41 AC_MSG_RESULT([$python_configdir])
  42 ])# _PGAC_CHECK_PYTHON_DIRS
  43
  44
  45 # PGAC_CHECK_PYTHON_EMBED_SETUP
  46 # -----------------------------
  47 #
  48 # Note: selecting libpython from python_configdir works in all Python
  49 # releases, but it generally finds a non-shared library, which means
  50 # that we are binding the python interpreter right into libplpython.so.
  51 # In Python 2.3 and up there should be a shared library available in
  52 # the main library location.
  53 AC_DEFUN([PGAC_CHECK_PYTHON_EMBED_SETUP],
  54 [AC_REQUIRE([_PGAC_CHECK_PYTHON_DIRS])
  55 AC_MSG_CHECKING([how to link an embedded Python application])
  56
  57 python_libdir=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBDIR'))))"`
  58 python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"`
  59 python_so=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('SO'))))"`
  60 ldlibrary=`echo "${python_ldlibrary}" | sed "s/${python_so}$//"`
  61
  62 if test x"${python_libdir}" != x"" -a x"${python_ldlibrary}" != x"" -a x"${python_ldlibrary}" != x"${ldlibrary}"
  63 then
  64         # New way: use the official shared library
  65         ldlibrary=`echo "${ldlibrary}" | sed "s/^lib//"`
  66         python_libspec="-L${python_libdir} -l${ldlibrary}"
  67 else
  68         # Old way: use libpython from python_configdir
  69         python_libdir="${python_configdir}"
  70         python_libspec="-L${python_libdir} -lpython${python_version}"
  71 fi
  72
  73 python_additional_libs=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','LOCALMODLIBS','BASEMODLIBS'))))"`
  74
  75 AC_MSG_RESULT([${python_libspec} ${python_additional_libs}])
  76
  77 AC_SUBST(python_libdir)[]dnl
  78 AC_SUBST(python_libspec)[]dnl
  79 AC_SUBST(python_additional_libs)[]dnl
  80
  81 # threaded python is not supported on bsd's
  82 AC_MSG_CHECKING(whether Python is compiled with thread support)
  83 pythreads=`${PYTHON} -c "import sys; print(int('thread' in sys.builtin_module_names))"`
  84 if test "$pythreads" = "1"; then
  85   AC_MSG_RESULT(yes)
  86   case $host_os in
  87   openbsd*|freebsd*)
  88     AC_MSG_ERROR([threaded Python not supported on this platform])
  89     ;;
  90   esac
  91 else
  92   AC_MSG_RESULT(no)
  93 fi
  94
  95 ])# PGAC_CHECK_PYTHON_EMBED_SETUP