1# 2# Autoconf macros for configuring the build of Python extension modules 3# 4# config/python.m4 5# 6 7# PGAC_PATH_PYTHON 8# ---------------- 9# Look for Python and set the output variable 'PYTHON' if found, 10# fail otherwise. 11# 12# As the Python 3 transition happens and PEP 394 isn't updated, we 13# need to cater to systems that don't have unversioned "python" by 14# default. Some systems ship with "python3" by default and perhaps 15# have "python" in an optional package. Some systems only have 16# "python2" and "python3", in which case it's reasonable to prefer the 17# newer version. 18AC_DEFUN([PGAC_PATH_PYTHON], 19[PGAC_PATH_PROGS(PYTHON, [python python3 python2]) 20if test x"$PYTHON" = x""; then 21 AC_MSG_ERROR([Python not found]) 22fi 23]) 24 25 26# _PGAC_CHECK_PYTHON_DIRS 27# ----------------------- 28# Determine the name of various directories of a given Python installation, 29# as well as the Python version. 30AC_DEFUN([_PGAC_CHECK_PYTHON_DIRS], 31[AC_REQUIRE([PGAC_PATH_PYTHON]) 32AC_MSG_CHECKING([for Python distutils module]) 33if "${PYTHON}" -c 'import distutils' 2>&AS_MESSAGE_LOG_FD 34then 35 AC_MSG_RESULT(yes) 36else 37 AC_MSG_RESULT(no) 38 AC_MSG_ERROR([distutils module not found]) 39fi 40AC_MSG_CHECKING([Python configuration directory]) 41python_majorversion=`${PYTHON} -c "import sys; print(sys.version[[0]])"` 42python_minorversion=`${PYTHON} -c "import sys; print(sys.version[[2]])"` 43python_version=`${PYTHON} -c "import sys; print(sys.version[[:3]])"` 44python_configdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"` 45AC_MSG_RESULT([$python_configdir]) 46 47# Reject unsupported Python versions as soon as practical. 48if test "$python_majorversion" -lt 3 -a "$python_minorversion" -lt 4; then 49 AC_MSG_ERROR([Python version $python_version is too old (version 2.4 or later is required)]) 50fi 51 52AC_MSG_CHECKING([Python include directories]) 53python_includespec=`${PYTHON} -c " 54import distutils.sysconfig 55a = '-I' + distutils.sysconfig.get_python_inc(False) 56b = '-I' + distutils.sysconfig.get_python_inc(True) 57if a == b: 58 print(a) 59else: 60 print(a + ' ' + b)"` 61if test "$PORTNAME" = win32 ; then 62 python_includespec=`echo $python_includespec | sed 's,[[\]],/,g'` 63fi 64AC_MSG_RESULT([$python_includespec]) 65 66AC_SUBST(python_majorversion)[]dnl 67AC_SUBST(python_version)[]dnl 68AC_SUBST(python_includespec)[]dnl 69])# _PGAC_CHECK_PYTHON_DIRS 70 71 72# PGAC_CHECK_PYTHON_EMBED_SETUP 73# ----------------------------- 74# 75# Set python_libdir to the path of the directory containing the Python shared 76# library. Set python_libspec to the -L/-l linker switches needed to link it. 77# Set python_additional_libs to contain any additional linker switches needed 78# for subsidiary libraries. 79# 80# In modern, well-configured Python installations, LIBDIR gives the correct 81# directory name and LDLIBRARY is the file name of the shlib. But in older 82# installations LDLIBRARY is frequently a useless path fragment, and it's also 83# possible that the shlib is in a standard library directory such as /usr/lib 84# so that LIBDIR is irrelevant. Also, some packagers put the .so symlink for 85# the shlib in ${python_configdir} even though Python itself never does. 86# We must also check that what we found is a shared library not a plain 87# library, which we do by checking its extension. (We used to rely on 88# Py_ENABLE_SHARED, but that only tells us that a shlib exists, not that 89# we found it.) 90AC_DEFUN([PGAC_CHECK_PYTHON_EMBED_SETUP], 91[AC_REQUIRE([_PGAC_CHECK_PYTHON_DIRS]) 92AC_MSG_CHECKING([how to link an embedded Python application]) 93 94python_libdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBDIR'))))"` 95python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"` 96 97# If LDLIBRARY exists and has a shlib extension, use it verbatim. 98ldlibrary=`echo "${python_ldlibrary}" | sed -e 's/\.so$//' -e 's/\.dll$//' -e 's/\.dylib$//' -e 's/\.sl$//'` 99if test -e "${python_libdir}/${python_ldlibrary}" -a x"${python_ldlibrary}" != x"${ldlibrary}" 100then 101 ldlibrary=`echo "${ldlibrary}" | sed "s/^lib//"` 102 found_shlib=1 103else 104 # Otherwise, guess the base name of the shlib. 105 # LDVERSION was added in Python 3.2, before that use VERSION, 106 # or failing that, $python_version from _PGAC_CHECK_PYTHON_DIRS. 107 python_ldversion=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDVERSION'))))"` 108 if test x"${python_ldversion}" != x""; then 109 ldlibrary="python${python_ldversion}" 110 else 111 python_version_var=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('VERSION'))))"` 112 if test x"${python_version_var}" != x""; then 113 ldlibrary="python${python_version_var}" 114 else 115 ldlibrary="python${python_version}" 116 fi 117 fi 118 # Search for a likely-looking file. 119 found_shlib=0 120 for d in "${python_libdir}" "${python_configdir}" /usr/lib64 /usr/lib 121 do 122 # We don't know the platform DLSUFFIX here, so check 'em all. 123 for e in .so .dll .dylib .sl; do 124 if test -e "$d/lib${ldlibrary}$e"; then 125 python_libdir="$d" 126 found_shlib=1 127 break 2 128 fi 129 done 130 done 131 # Some platforms (OpenBSD) require us to accept a bare versioned shlib 132 # (".so.n.n") as well. However, check this only after failing to find 133 # ".so" anywhere, because yet other platforms (Debian) put the .so 134 # symlink in a different directory from the underlying versioned shlib. 135 if test "$found_shlib" != 1; then 136 for d in "${python_libdir}" "${python_configdir}" /usr/lib64 /usr/lib 137 do 138 for f in "$d/lib${ldlibrary}.so."* ; do 139 if test -e "$f"; then 140 python_libdir="$d" 141 found_shlib=1 142 break 2 143 fi 144 done 145 done 146 fi 147 # As usual, Windows has its own ideas. Possible default library 148 # locations include c:/Windows/System32 and (for Cygwin) /usr/bin, 149 # and the "lib" prefix might not be there. 150 if test "$found_shlib" != 1 -a \( "$PORTNAME" = win32 -o "$PORTNAME" = cygwin \); then 151 for d in "${python_libdir}" "${python_configdir}" c:/Windows/System32 /usr/bin 152 do 153 for f in "$d/lib${ldlibrary}.dll" "$d/${ldlibrary}.dll" ; do 154 if test -e "$f"; then 155 python_libdir="$d" 156 found_shlib=1 157 break 2 158 fi 159 done 160 done 161 fi 162fi 163if test "$found_shlib" != 1; then 164 AC_MSG_ERROR([could not find shared library for Python 165You might have to rebuild your Python installation. Refer to the 166documentation for details. Use --without-python to disable building 167PL/Python.]) 168fi 169python_libspec="-L${python_libdir} -l${ldlibrary}" 170 171python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"` 172 173AC_MSG_RESULT([${python_libspec} ${python_additional_libs}]) 174 175AC_SUBST(python_libdir)[]dnl 176AC_SUBST(python_libspec)[]dnl 177AC_SUBST(python_additional_libs)[]dnl 178 179])# PGAC_CHECK_PYTHON_EMBED_SETUP 180