build/m4: make python_devel.m4 work with both python 2 and 3

Do the following:

1. Change the form of "print".
2. Use AC_CHECK_FUNC to avoid the need to generate library name.
3. Remove unused stuff.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

m4/python_devel.m4

@@ -1,38 +1,31 @@
 AC_DEFUN([AX_CHECK_PYTHON_DEVEL], [
 ac_previous_cppflags=$CPPFLAGS
 ac_previous_ldflags=$LDFLAGS
-ac_python_version=`$PYTHON -c 'import distutils.sysconfig; \
-    print distutils.sysconfig.get_config_var("VERSION")'`
 AC_PATH_PROG([pyconfig], [$PYTHON-config], [no])
 AS_IF([test x"$pyconfig" = x"no"], [
     dnl For those that don't have python-config
     CPPFLAGS="$CFLAGS `$PYTHON -c 'import distutils.sysconfig; \
         print "-I" + distutils.sysconfig.get_config_var("INCLUDEPY")'`"
     CPPFLAGS="$CPPFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("CFLAGS")'`"
-    PYTHON_LIBS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("LIBS")'`"
-    PYTHON_LIBS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("SYSLIBS")'`"
+        print(distutils.sysconfig.get_config_var("CFLAGS"))'`"
     LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print "-L" + distutils.sysconfig.get_python_lib(plat_specific=1,\
-        standard_lib=1) + "/config"'`"
+        print("-L" + distutils.sysconfig.get_python_lib(plat_specific=1,\
+        standard_lib=1) + "/config")'`"
     LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("LINKFORSHARED")'`"
+        print(distutils.sysconfig.get_config_var("LINKFORSHARED"))'`"
     LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("LDFLAGS")'`"
+        print(distutils.sysconfig.get_config_var("LDFLAGS"))'`"
 ], [
     dnl If python-config is found use it
     CPPFLAGS="$CFLAGS `$PYTHON-config --cflags`"
     LDFLAGS="$LDFLAGS `$PYTHON-config --ldflags`"
-    PYTHON_LIBS="$LIBS `$PYTHON-config --libs`"
 ])
 
 AC_CHECK_HEADER([Python.h], [],
     [AC_MSG_ERROR([Unable to find Python development headers])],)
-AC_CHECK_LIB(python$ac_python_version, PyArg_ParseTuple, [],
-    [AC_MSG_ERROR([Unable to find a suitable python development library])],
-    [$PYTHON_LIBS])
+AC_CHECK_FUNC([PyArg_ParseTuple], [],
+    [AC_MSG_ERROR([Unable to find a suitable python development library])]) 
+
 CPPFLAGS=$ac_previous_cppflags
 LDFLAGS=$ac_previous_ldflags
 ])

tools/configure

@@ -7418,8 +7418,6 @@ if test "$cross_compiling" != yes; then :
 
 ac_previous_cppflags=$CPPFLAGS
 ac_previous_ldflags=$LDFLAGS
-ac_python_version=`$PYTHON -c 'import distutils.sysconfig; \
-    print distutils.sysconfig.get_config_var("VERSION")'`
 # Extract the first word of "$PYTHON-config", so it can be a program name with args.
 set dummy $PYTHON-config; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
@@ -7466,24 +7464,19 @@ if test x"$pyconfig" = x"no"; then :
         CPPFLAGS="$CFLAGS `$PYTHON -c 'import distutils.sysconfig; \
         print "-I" + distutils.sysconfig.get_config_var("INCLUDEPY")'`"
     CPPFLAGS="$CPPFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("CFLAGS")'`"
-    PYTHON_LIBS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("LIBS")'`"
-    PYTHON_LIBS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("SYSLIBS")'`"
+        print(distutils.sysconfig.get_config_var("CFLAGS"))'`"
     LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print "-L" + distutils.sysconfig.get_python_lib(plat_specific=1,\
-        standard_lib=1) + "/config"'`"
+        print("-L" + distutils.sysconfig.get_python_lib(plat_specific=1,\
+        standard_lib=1) + "/config")'`"
     LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("LINKFORSHARED")'`"
+        print(distutils.sysconfig.get_config_var("LINKFORSHARED"))'`"
     LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
-        print distutils.sysconfig.get_config_var("LDFLAGS")'`"
+        print(distutils.sysconfig.get_config_var("LDFLAGS"))'`"
 
 else
 
         CPPFLAGS="$CFLAGS `$PYTHON-config --cflags`"
     LDFLAGS="$LDFLAGS `$PYTHON-config --ldflags`"
-    PYTHON_LIBS="$LIBS `$PYTHON-config --libs`"
 
 fi
 
@@ -7495,55 +7488,14 @@ else
 fi
 
 
-as_ac_Lib=`$as_echo "ac_cv_lib_python$ac_python_version''_PyArg_ParseTuple" | $as_tr_sh`
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for PyArg_ParseTuple in -lpython$ac_python_version" >&5
-$as_echo_n "checking for PyArg_ParseTuple in -lpython$ac_python_version... " >&6; }
-if eval \${$as_ac_Lib+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lpython$ac_python_version $PYTHON_LIBS $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-char PyArg_ParseTuple ();
-int
-main ()
-{
-return PyArg_ParseTuple ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  eval "$as_ac_Lib=yes"
-else
-  eval "$as_ac_Lib=no"
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-eval ac_res=\$$as_ac_Lib
-	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
-$as_echo "$ac_res" >&6; }
-if eval test \"x\$"$as_ac_Lib"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_LIBpython$ac_python_version" | $as_tr_cpp` 1
-_ACEOF
-
-  LIBS="-lpython$ac_python_version $LIBS"
+ac_fn_c_check_func "$LINENO" "PyArg_ParseTuple" "ac_cv_func_PyArg_ParseTuple"
+if test "x$ac_cv_func_PyArg_ParseTuple" = xyes; then :
 
 else
   as_fn_error $? "Unable to find a suitable python development library" "$LINENO" 5
 fi
 
+
 CPPFLAGS=$ac_previous_cppflags
 LDFLAGS=$ac_previous_ldflags