postgresql/config/python.m4
Tom Lane beff4bb9c7 Teach configure --with-python to report the Python version number.
We already do this for Perl and some other interesting tools, so it
seems sensible to do it for Python as well, especially since the
sub-release number is never determinable from other configure output
and even the major/minor numbers may not be clear without excavation
in config.log.

While at it, get rid of the code's assumption that both the major and
minor numbers contain exactly one digit.  That will foreseeably be
broken by Python 3.10 in perhaps four or five years.  That's far enough
out that we probably don't need to back-patch this.

Discussion: https://postgr.es/m/2186.1522681145@sss.pgh.pa.us
2018-04-02 12:26:12 -04:00

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#
# Autoconf macros for configuring the build of Python extension modules
#
# config/python.m4
#
# PGAC_PATH_PYTHON
# ----------------
# Look for Python and set the output variable 'PYTHON' if found,
# fail otherwise.
AC_DEFUN([PGAC_PATH_PYTHON],
[PGAC_PATH_PROGS(PYTHON, python)
if test x"$PYTHON" = x""; then
AC_MSG_ERROR([Python not found])
fi
])
# _PGAC_CHECK_PYTHON_DIRS
# -----------------------
# Determine the name of various directories of a given Python installation,
# as well as the Python version.
AC_DEFUN([_PGAC_CHECK_PYTHON_DIRS],
[AC_REQUIRE([PGAC_PATH_PYTHON])
python_fullversion=`${PYTHON} -c "import sys; print(sys.version)" | sed q`
AC_MSG_NOTICE([using python $python_fullversion])
# python_fullversion is typically n.n.n plus some trailing junk
python_majorversion=`echo "$python_fullversion" | sed '[s/^\([0-9]*\).*/\1/]'`
python_minorversion=`echo "$python_fullversion" | sed '[s/^[0-9]*\.\([0-9]*\).*/\1/]'`
python_version=`echo "$python_fullversion" | sed '[s/^\([0-9]*\.[0-9]*\).*/\1/]'`
# Reject unsupported Python versions as soon as practical.
if test "$python_majorversion" -lt 3 -a "$python_minorversion" -lt 4; then
AC_MSG_ERROR([Python version $python_version is too old (version 2.4 or later is required)])
fi
AC_MSG_CHECKING([for Python distutils module])
if "${PYTHON}" -c 'import distutils' 2>&AS_MESSAGE_LOG_FD
then
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
AC_MSG_ERROR([distutils module not found])
fi
AC_MSG_CHECKING([Python configuration directory])
python_configdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"`
AC_MSG_RESULT([$python_configdir])
AC_MSG_CHECKING([Python include directories])
python_includespec=`${PYTHON} -c "
import distutils.sysconfig
a = '-I' + distutils.sysconfig.get_python_inc(False)
b = '-I' + distutils.sysconfig.get_python_inc(True)
if a == b:
print(a)
else:
print(a + ' ' + b)"`
if test "$PORTNAME" = win32 ; then
python_includespec=`echo $python_includespec | sed 's,[[\]],/,g'`
fi
AC_MSG_RESULT([$python_includespec])
AC_SUBST(python_majorversion)[]dnl
AC_SUBST(python_version)[]dnl
AC_SUBST(python_includespec)[]dnl
])# _PGAC_CHECK_PYTHON_DIRS
# PGAC_CHECK_PYTHON_EMBED_SETUP
# -----------------------------
#
# Set python_libdir to the path of the directory containing the Python shared
# library. Set python_libspec to the -L/-l linker switches needed to link it.
# Set python_additional_libs to contain any additional linker switches needed
# for subsidiary libraries.
#
# In modern, well-configured Python installations, LIBDIR gives the correct
# directory name and LDLIBRARY is the file name of the shlib. But in older
# installations LDLIBRARY is frequently a useless path fragment, and it's also
# possible that the shlib is in a standard library directory such as /usr/lib
# so that LIBDIR is irrelevant. Also, some packagers put the .so symlink for
# the shlib in ${python_configdir} even though Python itself never does.
# We must also check that what we found is a shared library not a plain
# library, which we do by checking its extension. (We used to rely on
# Py_ENABLE_SHARED, but that only tells us that a shlib exists, not that
# we found it.)
AC_DEFUN([PGAC_CHECK_PYTHON_EMBED_SETUP],
[AC_REQUIRE([_PGAC_CHECK_PYTHON_DIRS])
AC_MSG_CHECKING([how to link an embedded Python application])
python_libdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBDIR'))))"`
python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"`
# If LDLIBRARY exists and has a shlib extension, use it verbatim.
ldlibrary=`echo "${python_ldlibrary}" | sed -e 's/\.so$//' -e 's/\.dll$//' -e 's/\.dylib$//' -e 's/\.sl$//'`
if test -e "${python_libdir}/${python_ldlibrary}" -a x"${python_ldlibrary}" != x"${ldlibrary}"
then
ldlibrary=`echo "${ldlibrary}" | sed "s/^lib//"`
found_shlib=1
else
# Otherwise, guess the base name of the shlib.
# LDVERSION was added in Python 3.2, before that use VERSION,
# or failing that, $python_version from _PGAC_CHECK_PYTHON_DIRS.
python_ldversion=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDVERSION'))))"`
if test x"${python_ldversion}" != x""; then
ldlibrary="python${python_ldversion}"
else
python_version_var=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('VERSION'))))"`
if test x"${python_version_var}" != x""; then
ldlibrary="python${python_version_var}"
else
ldlibrary="python${python_version}"
fi
fi
# Search for a likely-looking file.
found_shlib=0
for d in "${python_libdir}" "${python_configdir}" /usr/lib64 /usr/lib
do
# We don't know the platform DLSUFFIX here, so check 'em all.
for e in .so .dll .dylib .sl; do
if test -e "$d/lib${ldlibrary}$e"; then
python_libdir="$d"
found_shlib=1
break 2
fi
done
done
# Some platforms (OpenBSD) require us to accept a bare versioned shlib
# (".so.n.n") as well. However, check this only after failing to find
# ".so" anywhere, because yet other platforms (Debian) put the .so
# symlink in a different directory from the underlying versioned shlib.
if test "$found_shlib" != 1; then
for d in "${python_libdir}" "${python_configdir}" /usr/lib64 /usr/lib
do
for f in "$d/lib${ldlibrary}.so."* ; do
if test -e "$f"; then
python_libdir="$d"
found_shlib=1
break 2
fi
done
done
fi
# As usual, Windows has its own ideas. Possible default library
# locations include c:/Windows/System32 and (for Cygwin) /usr/bin,
# and the "lib" prefix might not be there.
if test "$found_shlib" != 1 -a \( "$PORTNAME" = win32 -o "$PORTNAME" = cygwin \); then
for d in "${python_libdir}" "${python_configdir}" c:/Windows/System32 /usr/bin
do
for f in "$d/lib${ldlibrary}.dll" "$d/${ldlibrary}.dll" ; do
if test -e "$f"; then
python_libdir="$d"
found_shlib=1
break 2
fi
done
done
fi
fi
if test "$found_shlib" != 1; then
AC_MSG_ERROR([could not find shared library for Python
You might have to rebuild your Python installation. Refer to the
documentation for details. Use --without-python to disable building
PL/Python.])
fi
python_libspec="-L${python_libdir} -l${ldlibrary}"
python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
AC_MSG_RESULT([${python_libspec} ${python_additional_libs}])
AC_SUBST(python_libdir)[]dnl
AC_SUBST(python_libspec)[]dnl
AC_SUBST(python_additional_libs)[]dnl
])# PGAC_CHECK_PYTHON_EMBED_SETUP