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f201da39ed
This avoids possibly selecting Python 2.x on systems that have both Python 2 and Python 3. We used to feel that what "python" links to is a user choice that we should honor. However, we're about to cease support for Python 2, so users will no longer have any choice of that sort. This small change is being made ahead of the big Python-2-ectomy so that we can see how much of the buildfarm is not yet prepared for that. Systems with only Python 2 will continue to build that way, for now. Discussion: https://postgr.es/m/2872c9a0-4b0a-1354-d5f6-94d6f85ba354@enterprisedb.com
183 lines
6.9 KiB
Plaintext
183 lines
6.9 KiB
Plaintext
#
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# Autoconf macros for configuring the build of Python extension modules
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#
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# config/python.m4
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#
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# PGAC_PATH_PYTHON
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# ----------------
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# Look for Python and set the output variable 'PYTHON' if found,
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# fail otherwise.
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#
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# Since we are transitioning to supporting only Python 3.x,
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# prefer python3 to plain python. If the latter exists at all,
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# it very possibly points to python2, which we don't want to
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# select unless it's the only choice.
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AC_DEFUN([PGAC_PATH_PYTHON],
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[PGAC_PATH_PROGS(PYTHON, [python3 python python2])
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AC_ARG_VAR(PYTHON, [Python program])dnl
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if test x"$PYTHON" = x""; then
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AC_MSG_ERROR([Python not found])
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fi
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])
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# _PGAC_CHECK_PYTHON_DIRS
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# -----------------------
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# Determine the name of various directories of a given Python installation,
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# as well as the Python version.
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AC_DEFUN([_PGAC_CHECK_PYTHON_DIRS],
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[AC_REQUIRE([PGAC_PATH_PYTHON])
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python_fullversion=`${PYTHON} -c "import sys; print(sys.version)" | sed q`
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AC_MSG_NOTICE([using python $python_fullversion])
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# python_fullversion is typically n.n.n plus some trailing junk
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python_majorversion=`echo "$python_fullversion" | sed '[s/^\([0-9]*\).*/\1/]'`
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python_minorversion=`echo "$python_fullversion" | sed '[s/^[0-9]*\.\([0-9]*\).*/\1/]'`
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python_version=`echo "$python_fullversion" | sed '[s/^\([0-9]*\.[0-9]*\).*/\1/]'`
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# Reject unsupported Python versions as soon as practical.
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if test "$python_majorversion" -lt 3 -a "$python_minorversion" -lt 6; then
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AC_MSG_ERROR([Python version $python_version is too old (version 2.6 or later is required)])
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fi
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AC_MSG_CHECKING([for Python distutils module])
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if "${PYTHON}" -c 'import distutils' 2>&AS_MESSAGE_LOG_FD
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then
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AC_MSG_RESULT(yes)
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else
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AC_MSG_RESULT(no)
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AC_MSG_ERROR([distutils module not found])
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fi
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AC_MSG_CHECKING([Python configuration directory])
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python_configdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"`
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AC_MSG_RESULT([$python_configdir])
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AC_MSG_CHECKING([Python include directories])
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python_includespec=`${PYTHON} -c "
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import distutils.sysconfig
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a = '-I' + distutils.sysconfig.get_python_inc(False)
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b = '-I' + distutils.sysconfig.get_python_inc(True)
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if a == b:
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print(a)
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else:
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print(a + ' ' + b)"`
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if test "$PORTNAME" = win32 ; then
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python_includespec=`echo $python_includespec | sed 's,[[\]],/,g'`
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fi
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AC_MSG_RESULT([$python_includespec])
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AC_SUBST(python_majorversion)[]dnl
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AC_SUBST(python_version)[]dnl
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AC_SUBST(python_includespec)[]dnl
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])# _PGAC_CHECK_PYTHON_DIRS
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# PGAC_CHECK_PYTHON_EMBED_SETUP
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# -----------------------------
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#
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# Set python_libdir to the path of the directory containing the Python shared
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# library. Set python_libspec to the -L/-l linker switches needed to link it.
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# Set python_additional_libs to contain any additional linker switches needed
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# for subsidiary libraries.
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#
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# In modern, well-configured Python installations, LIBDIR gives the correct
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# directory name and LDLIBRARY is the file name of the shlib. But in older
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# installations LDLIBRARY is frequently a useless path fragment, and it's also
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# possible that the shlib is in a standard library directory such as /usr/lib
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# so that LIBDIR is irrelevant. Also, some packagers put the .so symlink for
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# the shlib in ${python_configdir} even though Python itself never does.
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# We must also check that what we found is a shared library not a plain
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# library, which we do by checking its extension. (We used to rely on
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# Py_ENABLE_SHARED, but that only tells us that a shlib exists, not that
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# we found it.)
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AC_DEFUN([PGAC_CHECK_PYTHON_EMBED_SETUP],
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[AC_REQUIRE([_PGAC_CHECK_PYTHON_DIRS])
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AC_MSG_CHECKING([how to link an embedded Python application])
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python_libdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBDIR'))))"`
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python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"`
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# If LDLIBRARY exists and has a shlib extension, use it verbatim.
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ldlibrary=`echo "${python_ldlibrary}" | sed -e 's/\.so$//' -e 's/\.dll$//' -e 's/\.dylib$//' -e 's/\.sl$//'`
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if test -e "${python_libdir}/${python_ldlibrary}" -a x"${python_ldlibrary}" != x"${ldlibrary}"
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then
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ldlibrary=`echo "${ldlibrary}" | sed "s/^lib//"`
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found_shlib=1
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else
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# Otherwise, guess the base name of the shlib.
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# LDVERSION was added in Python 3.2, before that use VERSION,
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# or failing that, $python_version from _PGAC_CHECK_PYTHON_DIRS.
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python_ldversion=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDVERSION'))))"`
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if test x"${python_ldversion}" != x""; then
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ldlibrary="python${python_ldversion}"
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else
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python_version_var=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('VERSION'))))"`
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if test x"${python_version_var}" != x""; then
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ldlibrary="python${python_version_var}"
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else
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ldlibrary="python${python_version}"
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fi
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fi
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# Search for a likely-looking file.
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found_shlib=0
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for d in "${python_libdir}" "${python_configdir}" /usr/lib64 /usr/lib
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do
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# We don't know the platform DLSUFFIX here, so check 'em all.
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for e in .so .dll .dylib .sl; do
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if test -e "$d/lib${ldlibrary}$e"; then
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python_libdir="$d"
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found_shlib=1
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break 2
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fi
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done
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done
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# Some platforms (OpenBSD) require us to accept a bare versioned shlib
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# (".so.n.n") as well. However, check this only after failing to find
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# ".so" anywhere, because yet other platforms (Debian) put the .so
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# symlink in a different directory from the underlying versioned shlib.
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if test "$found_shlib" != 1; then
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for d in "${python_libdir}" "${python_configdir}" /usr/lib64 /usr/lib
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do
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for f in "$d/lib${ldlibrary}.so."* ; do
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if test -e "$f"; then
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python_libdir="$d"
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found_shlib=1
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break 2
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fi
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done
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done
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fi
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# As usual, Windows has its own ideas. Possible default library
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# locations include c:/Windows/System32 and (for Cygwin) /usr/bin,
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# and the "lib" prefix might not be there.
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if test "$found_shlib" != 1 -a \( "$PORTNAME" = win32 -o "$PORTNAME" = cygwin \); then
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for d in "${python_libdir}" "${python_configdir}" c:/Windows/System32 /usr/bin
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do
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for f in "$d/lib${ldlibrary}.dll" "$d/${ldlibrary}.dll" ; do
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if test -e "$f"; then
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python_libdir="$d"
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found_shlib=1
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break 2
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fi
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done
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done
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fi
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fi
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if test "$found_shlib" != 1; then
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AC_MSG_ERROR([could not find shared library for Python
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You might have to rebuild your Python installation. Refer to the
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documentation for details. Use --without-python to disable building
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PL/Python.])
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fi
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python_libspec="-L${python_libdir} -l${ldlibrary}"
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python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
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AC_MSG_RESULT([${python_libspec} ${python_additional_libs}])
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AC_SUBST(python_libdir)[]dnl
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AC_SUBST(python_libspec)[]dnl
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AC_SUBST(python_additional_libs)[]dnl
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])# PGAC_CHECK_PYTHON_EMBED_SETUP
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