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b55f62abb2
macOS has traditionally used extension .dylib for shared libraries (used at build time) and .so for dynamically loaded modules (used by dlopen()). This complicates the build system a bit. Also, Meson uses .dylib for both, so it would be worth unifying this in order to be able to get equal build output. There doesn't appear to be any reason to use any particular extension for dlopened modules, since dlopen() will accept anything and PostgreSQL is well-factored to be able to deal with any extension. Other software packages that I have handy appear to be about 50/50 split on which extension they use for their plugins. So it seems possible to change this safely. Discussion: https://www.postgresql.org/message-id/flat/bcc45f78-e3c3-8fb3-7c42-5371b48b5266%40enterprisedb.com
178 lines
6.8 KiB
Plaintext
178 lines
6.8 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 supporting only Python 3.x, prefer python3 to plain python. If
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# the latter exists at all, it very possibly points to python2.
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# As the Python 3 transition happens and PEP 394 isn't updated, we
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# need to cater to systems that don't have unversioned "python" by
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# default. Some systems ship with "python3" by default and perhaps
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# have "python" in an optional package. Some systems only have
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# "python2" and "python3", in which case it's reasonable to prefer the
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# newer version.
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AC_DEFUN([PGAC_PATH_PYTHON],
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[PGAC_PATH_PROGS(PYTHON, [python3 python])
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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; then
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AC_MSG_ERROR([Python version $python_version is too old (version 3 or later is required)])
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fi
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AC_MSG_CHECKING([for Python sysconfig module])
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if "${PYTHON}" -c 'import sysconfig' 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([sysconfig module not found])
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fi
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AC_MSG_CHECKING([Python configuration directory])
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python_configdir=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBPL'))))"`
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AC_MSG_RESULT([$python_configdir])
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AC_MSG_CHECKING([Python include directory])
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python_includespec=`${PYTHON} -c "import sysconfig; print('-I' + sysconfig.get_config_var('INCLUDEPY'))"`
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if test "$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 sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBDIR'))))"`
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python_ldlibrary=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LDLIBRARY'))))"`
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# If LDLIBRARY exists and has a shlib extension, use it verbatim.
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ldlibrary=`echo "${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 sysconfig; print(' '.join(filter(None,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=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('VERSION'))))"`
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if test x"${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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if test -e "$d/lib${ldlibrary}${DLSUFFIX}"; then
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python_libdir="$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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# 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 sysconfig; print(' '.join(filter(None,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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