annotate m4/ac_python_devel.m4 @ 237:568b9ef02a56

Added tag stable-0-6-43 for changeset 093e0e9248bb
author Carl Byington <carl@five-ten-sg.com>
date Sat, 12 Sep 2009 14:12:22 -0700
parents bfc35fd55254
children
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1 # ===========================================================================
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2 # http://www.nongnu.org/autoconf-archive/ac_python_devel.html
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3 # ===========================================================================
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4 #
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5 # SYNOPSIS
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6 #
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7 # AC_PYTHON_DEVEL([version])
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8 #
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9 # DESCRIPTION
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10 #
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11 # Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
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12 # in your configure.ac.
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13 #
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14 # This macro checks for Python and tries to get the include path to
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15 # 'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LDFLAGS)
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16 # output variables. It also exports $(PYTHON_EXTRA_LIBS) and
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17 # $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
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18 #
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19 # You can search for some particular version of Python by passing a
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20 # parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
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21 # note that you *have* to pass also an operator along with the version to
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22 # match, and pay special attention to the single quotes surrounding the
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23 # version number. Don't use "PYTHON_VERSION" for this: that environment
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24 # variable is declared as precious and thus reserved for the end-user.
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25 #
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26 # This macro should work for all versions of Python >= 2.1.0. As an end
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27 # user, you can disable the check for the python version by setting the
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28 # PYTHON_NOVERSIONCHECK environment variable to something else than the
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29 # empty string.
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30 #
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31 # If you need to use this macro for an older Python version, please
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32 # contact the authors. We're always open for feedback.
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33 #
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34 # LICENSE
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35 #
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36 # Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
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37 # Copyright (c) 2009 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
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38 # Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
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39 # Copyright (c) 2009 Andrew Collier <colliera@ukzn.ac.za>
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40 # Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
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41 # Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
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42 #
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43 # This program is free software: you can redistribute it and/or modify it
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44 # under the terms of the GNU General Public License as published by the
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45 # Free Software Foundation, either version 3 of the License, or (at your
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46 # option) any later version.
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47 #
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48 # This program is distributed in the hope that it will be useful, but
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49 # WITHOUT ANY WARRANTY; without even the implied warranty of
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50 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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51 # Public License for more details.
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52 #
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53 # You should have received a copy of the GNU General Public License along
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54 # with this program. If not, see <http://www.gnu.org/licenses/>.
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55 #
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56 # As a special exception, the respective Autoconf Macro's copyright owner
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57 # gives unlimited permission to copy, distribute and modify the configure
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58 # scripts that are the output of Autoconf when processing the Macro. You
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59 # need not follow the terms of the GNU General Public License when using
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60 # or distributing such scripts, even though portions of the text of the
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61 # Macro appear in them. The GNU General Public License (GPL) does govern
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62 # all other use of the material that constitutes the Autoconf Macro.
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63 #
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64 # This special exception to the GPL applies to versions of the Autoconf
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65 # Macro released by the Autoconf Archive. When you make and distribute a
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66 # modified version of the Autoconf Macro, you may extend this special
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67 # exception to the GPL to apply to your modified version as well.
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68
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69 AC_DEFUN([AC_PYTHON_DEVEL],[
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70 #
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71 # Allow the use of a (user set) custom python version
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72 #
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73 AC_ARG_VAR([PYTHON_VERSION],[The installed Python
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74 version to use, for example '2.3'. This string
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75 will be appended to the Python interpreter
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76 canonical name.])
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77
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78 AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
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79 if test -z "$PYTHON"; then
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80 AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
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81 PYTHON_VERSION=""
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82 fi
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83
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84 #
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85 # Check for a version of Python >= 2.1.0
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86 #
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87 AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
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88 ac_supports_python_ver=`$PYTHON -c "import sys; \
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89 ver = sys.version.split ()[[0]]; \
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90 print (ver >= '2.1.0')"`
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91 if test "$ac_supports_python_ver" != "True"; then
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92 if test -z "$PYTHON_NOVERSIONCHECK"; then
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93 AC_MSG_RESULT([no])
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94 AC_MSG_FAILURE([
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95 This version of the AC@&t@_PYTHON_DEVEL macro
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96 doesn't work properly with versions of Python before
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97 2.1.0. You may need to re-run configure, setting the
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98 variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
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99 PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
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100 Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
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101 to something else than an empty string.
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102 ])
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103 else
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104 AC_MSG_RESULT([skip at user request])
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105 fi
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106 else
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107 AC_MSG_RESULT([yes])
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108 fi
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109
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110 #
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111 # if the macro parameter ``version'' is set, honour it
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112 #
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113 if test -n "$1"; then
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114 AC_MSG_CHECKING([for a version of Python $1])
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115 ac_supports_python_ver=`$PYTHON -c "import sys; \
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116 ver = sys.version.split ()[[0]]; \
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117 print (ver >= $1)"`
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118 if test "$ac_supports_python_ver" = "True"; then
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119 AC_MSG_RESULT([yes])
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120 else
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121 AC_MSG_RESULT([no])
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122 AC_MSG_ERROR([this package requires Python $1.
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123 If you have it installed, but it isn't the default Python
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124 interpreter in your system path, please pass the PYTHON_VERSION
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125 variable to configure. See ``configure --help'' for reference.
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126 ])
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127 PYTHON_VERSION=""
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128 fi
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129 fi
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130
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131 #
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132 # Check if you have distutils, else fail
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133 #
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134 AC_MSG_CHECKING([for the distutils Python package])
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135 ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
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136 if test -z "$ac_distutils_result"; then
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137 AC_MSG_RESULT([yes])
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138 else
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139 AC_MSG_RESULT([no])
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140 AC_MSG_ERROR([cannot import Python module "distutils".
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141 Please check your Python installation. The error was:
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142 $ac_distutils_result])
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143 PYTHON_VERSION=""
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144 fi
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145
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146 #
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147 # Check for Python include path
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148 #
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149 AC_MSG_CHECKING([for Python include path])
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150 if test -z "$PYTHON_CPPFLAGS"; then
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151 python_path=`$PYTHON -c "import distutils.sysconfig; \
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152 print (distutils.sysconfig.get_python_inc ());"`
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153 if test -n "${python_path}"; then
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154 python_path="-I$python_path"
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155 fi
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156 PYTHON_CPPFLAGS=$python_path
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157 fi
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158 AC_MSG_RESULT([$PYTHON_CPPFLAGS])
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159 AC_SUBST([PYTHON_CPPFLAGS])
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160
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161 #
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162 # Check for Python library path
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163 #
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164 AC_MSG_CHECKING([for Python library path])
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165 if test -z "$PYTHON_LDFLAGS"; then
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166 # (makes two attempts to ensure we've got a version number
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167 # from the interpreter)
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168 ac_python_version=`cat<<EOD | $PYTHON -
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169
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170 # join all versioning strings, on some systems
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171 # major/minor numbers could be in different list elements
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172 from distutils.sysconfig import *
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173 ret = ''
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174 for e in get_config_vars ('VERSION'):
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175 if (e != None):
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176 ret += e
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177 print (ret)
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178 EOD`
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179
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180 if test -z "$ac_python_version"; then
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181 if test -n "$PYTHON_VERSION"; then
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182 ac_python_version=$PYTHON_VERSION
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183 else
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184 ac_python_version=`$PYTHON -c "import sys; \
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185 print (sys.version[[:3]])"`
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186 fi
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187 fi
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188
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189 # Make the versioning information available to the compiler
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190 AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
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191 [If available, contains the Python version number currently in use.])
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192
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193 # First, the library directory:
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194 ac_python_libdir=`cat<<EOD | $PYTHON -
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195
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196 # There should be only one
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197 import distutils.sysconfig
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198 for e in distutils.sysconfig.get_config_vars ('LIBDIR'):
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199 if e != None:
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200 print (e)
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201 break
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202 EOD`
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203
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204 # Before checking for libpythonX.Y, we need to know
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205 # the extension the OS we're on uses for libraries
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206 # (we take the first one, if there's more than one fix me!):
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207 ac_python_soext=`$PYTHON -c \
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208 "import distutils.sysconfig; \
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209 print (distutils.sysconfig.get_config_vars('SO')[[0]])"`
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210
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211 # Now, for the library:
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212 ac_python_soname=`$PYTHON -c \
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213 "import distutils.sysconfig; \
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214 print (distutils.sysconfig.get_config_vars('LDLIBRARY')[[0]])"`
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215
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216 # Strip away extension from the end to canonicalize its name:
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217 ac_python_library=`echo "$ac_python_soname" | sed "s/${ac_python_soext}$//"`
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218
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219 # This small piece shamelessly adapted from PostgreSQL python macro;
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220 # credits goes to momjian, I think. I'd like to put the right name
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221 # in the credits, if someone can point me in the right direction... ?
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222 #
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223 if test -n "$ac_python_libdir" -a -n "$ac_python_library" \
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224 -a x"$ac_python_library" != x"$ac_python_soname"
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225 then
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226 # use the official shared library
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227 ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
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228 PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
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229 else
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230 # old way: use libpython from python_configdir
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231 ac_python_libdir=`$PYTHON -c \
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232 "from distutils.sysconfig import get_python_lib as f; \
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233 import os; \
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234 print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
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235 PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
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236 fi
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237
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238 if test -z "PYTHON_LDFLAGS"; then
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239 AC_MSG_ERROR([
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240 Cannot determine location of your Python DSO. Please check it was installed with
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241 dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.
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242 ])
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243 fi
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244 fi
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245 AC_MSG_RESULT([$PYTHON_LDFLAGS])
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246 AC_SUBST([PYTHON_LDFLAGS])
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247
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248 #
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249 # Check for site packages
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250 #
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251 AC_MSG_CHECKING([for Python site-packages path])
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252 if test -z "$PYTHON_SITE_PKG"; then
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253 PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
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254 print (distutils.sysconfig.get_python_lib(0,0));"`
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255 fi
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256 AC_MSG_RESULT([$PYTHON_SITE_PKG])
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257 AC_SUBST([PYTHON_SITE_PKG])
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258
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259 #
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260 # libraries which must be linked in when embedding
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261 #
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262 AC_MSG_CHECKING(python extra libraries)
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263 if test -z "$PYTHON_EXTRA_LIBS"; then
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264 PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
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265 conf = distutils.sysconfig.get_config_var; \
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266 print (conf('LOCALMODLIBS') + ' ' + conf('LIBS'))"`
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267 fi
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268 AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
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269 AC_SUBST(PYTHON_EXTRA_LIBS)
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270
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271 #
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272 # linking flags needed when embedding
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273 #
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274 AC_MSG_CHECKING(python extra linking flags)
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275 if test -z "$PYTHON_EXTRA_LDFLAGS"; then
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276 PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
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277 conf = distutils.sysconfig.get_config_var; \
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278 print (conf('LINKFORSHARED'))"`
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279 fi
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280 AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
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281 AC_SUBST(PYTHON_EXTRA_LDFLAGS)
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282
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283 #
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284 # final check to see if everything compiles alright
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285 #
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286 AC_MSG_CHECKING([consistency of all components of python development environment])
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287 # save current global flags
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288 ac_save_LIBS="$LIBS"
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289 ac_save_CPPFLAGS="$CPPFLAGS"
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290 LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
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291 CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
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292 AC_LANG_PUSH([C])
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293 AC_LINK_IFELSE([
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294 AC_LANG_PROGRAM([[#include <Python.h>]],
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295 [[Py_Initialize();]])
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296 ],[pythonexists=yes],[pythonexists=no])
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297 AC_LANG_POP([C])
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298 # turn back to default flags
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299 CPPFLAGS="$ac_save_CPPFLAGS"
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300 LIBS="$ac_save_LIBS"
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301
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302 AC_MSG_RESULT([$pythonexists])
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303
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304 if test ! "x$pythonexists" = "xyes"; then
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305 AC_MSG_FAILURE([
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306 Could not link test program to Python. Maybe the main Python library has been
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307 installed in some non-standard library path. If so, pass it to configure,
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308 via the LDFLAGS environment variable.
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309 Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
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310 ============================================================================
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311 ERROR!
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312 You probably have to install the development version of the Python package
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313 for your distribution. The exact name of this package varies among them.
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314 ============================================================================
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315 ])
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316 PYTHON_VERSION=""
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317 fi
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318
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319 #
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320 # all done!
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321 #
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322 ])