Merge branch 'dfsg-orig'
[debian/gnuradio] / gr-howto-write-a-block / config / gr_python.m4
diff --git a/gr-howto-write-a-block/config/gr_python.m4 b/gr-howto-write-a-block/config/gr_python.m4
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+dnl
+dnl Copyright 2003,2004,2005 Free Software Foundation, Inc.
+dnl 
+dnl This file is part of GNU Radio
+dnl 
+dnl GNU Radio is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3, or (at your option)
+dnl any later version.
+dnl 
+dnl GNU Radio is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl along with GNU Radio; see the file COPYING.  If not, write to
+dnl the Free Software Foundation, Inc., 51 Franklin Street,
+dnl Boston, MA 02110-1301, USA.
+dnl 
+
+# PYTHON_DEVEL()
+#
+# Checks for Python and tries to get the include path to 'Python.h'.
+# It sets the $(PYTHON_CPPFLAGS), $(PYTHON_LDFLAGS) and $(pythondir) output variables,
+#
+AC_DEFUN([PYTHON_DEVEL],[
+       AC_REQUIRE([AM_PATH_PYTHON])
+       AC_REQUIRE([AC_CANONICAL_HOST])
+
+       AC_ARG_WITH(pythondir,
+                    AC_HELP_STRING([--with-pythondir=DIR], 
+                       [python installation directory (cross-compiling) [[default=$prefix/lib/python2.5/site-packages]]]),
+                   [with_pythondir=${withval}],[with_pythondir=${prefix}/lib/python2.5/site-packages])
+
+       # if we're cross-compiling, asking the host python about any of
+       # this is completely useless...
+
+       if test x$cross_compiling != xno
+       then
+               pythondir=$with_pythondir
+               pyexecdir=$with_pythondir
+               AC_SUBST(PYTHON_CPPFLAGS)
+               AC_SUBST(PYTHON_LDFLAGS)
+        else
+
+           # For Fedora Core 5 and 6, see ticket:39 in Trac
+           if test -f '/etc/redhat-release'; then
+                   if  (echo $pyexecdir | grep -q lib64); then
+                           pythondir="$pyexecdir"
+                   fi
+           fi
+
+           # Check for Python include path
+           AC_MSG_CHECKING([for Python include path])
+           if test -z "$PYTHON" ; then
+                   AC_MSG_ERROR([cannot find Python path])
+           fi
+
+           # ask distutils which include path we should use
+           python_cmd='
+import distutils.sysconfig
+import os
+path = distutils.sysconfig.get_python_inc(plat_specific=False)
+if os.sep == "\\":
+  path = path.replace("\\", "/")
+print path
+'
+           python_path=`$PYTHON -c "$python_cmd"`
+           AC_MSG_RESULT([$python_path])
+           if test -z "$python_path" ; then
+                   AC_MSG_ERROR([cannot find Python include path])
+           fi
+
+           AC_SUBST(PYTHON_CPPFLAGS,[-I$python_path])
+
+           # Check for Python headers usability
+           python_save_CPPFLAGS=$CPPFLAGS
+           CPPFLAGS="$CPPFLAGS $PYTHON_CPPFLAGS"
+           AC_CHECK_HEADERS([Python.h], [],
+                           [AC_MSG_ERROR([cannot find usable Python headers])])
+           CPPFLAGS="$python_save_CPPFLAGS"
+
+           # Only set this on mingw and cygwin hosts, (only implemented
+           # for mingw host, for crosscompiling you need to trick this)
+
+           PYTHON_LDFLAGS=""
+           case $host_os in
+                *mingw* | *cygwin* )
+             AC_MSG_CHECKING([for Python LDFLAGS])
+
+           python_cmd='
+import distutils.sysconfig
+import os
+path = distutils.sysconfig.get_config_var("LIBPL")
+if path == None:
+  path = distutils.sysconfig.PREFIX + "/libs"
+if os.sep == "\\":
+  path = path.replace("\\", "/")
+print path
+'
+             python_stdlib_path=`$PYTHON -c "$python_cmd"`
+
+             python_version_nodot=`echo $PYTHON_VERSION | sed "s,\.,,"`
+             libpython_name="python$PYTHON_VERSION"
+
+             # Standard install of python for win32 has libpython24.a
+             # instead of libpython2.4.a so we check for the library
+             # without the dot in the version number.
+
+             python_stdlib_filename=`find $python_stdlib_path -type f -name libpython$python_version_nodot.* -print | sed "1q"`
+             if test -n "$python_stdlib_filename" ; then
+                   libpython_name="python$python_version_nodot"
+             fi
+
+             PYTHON_LDFLAGS="-L$python_stdlib_path -l$libpython_name"
+             AC_MSG_RESULT($PYTHON_LDFLAGS) 
+             # Replace all backslashes in PYTHON Paths with forward slashes
+             pythondir=`echo $pythondir |sed 's,\\\\,/,g'`
+             pkgpythondir=`echo $pkgpythondir |sed 's,\\\\,/,g'`
+             pyexecdir=`echo $pyexecdir |sed 's,\\\\,/,g'`
+             pkgpyexecdir=`echo $pkgpyexecdir |sed 's,\\\\,/,g'`
+             ;;
+           esac
+
+           case $host_os in
+                *mingw* )
+             # Python 2.5 requires ".pyd" instead of ".dll" for extensions
+             PYTHON_LDFLAGS="-shrext .pyd ${PYTHON_LDFLAGS}"
+           esac
+
+           AC_SUBST(PYTHON_LDFLAGS)
+       fi
+])
+
+# PYTHON_CHECK_MODULE
+#
+# Determines if a particular Python module can be imported
+#
+# $1 - module name
+# $2 - module description
+# $3 - action if found
+# $4 - action if not found
+# $5 - test command
+
+AC_DEFUN([PYTHON_CHECK_MODULE],[
+    AC_MSG_CHECKING([for $2])
+    dnl ########################################
+    dnl # import and test checking
+    dnl ########################################
+    if test "$5"; then
+        python_cmd='
+try:
+    import $1
+    assert $5
+except: exit(1)'
+    dnl ########################################
+    dnl # import checking only
+    dnl ########################################
+    else
+        python_cmd='
+try: import $1
+except: exit(1)'
+    fi
+    if ! $PYTHON -c "$python_cmd" 2> /dev/null; then
+        AC_MSG_RESULT([no])
+        $4
+    else
+        AC_MSG_RESULT([yes])
+        $3
+    fi
+])