Fix --with-2to3 configure option

CHANGES.current

@@ -7,6 +7,9 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.0.0 (in progress)
 ===========================
 
+2017-09-19: futatuki
+            [Python] #1003 Add --with-2to3=/path/to/2to3 option to configure.
+
 2017-09-18: wsfulton
             Fix type promotion wrapping constant expressions of the form:
               # define EXPR_MIXED1    (0x80 + 11.1) - 1

Examples/Makefile.in

@@ -386,7 +386,7 @@ else
   PYSCRIPT = $(RUNME)3.py
 endif
 
-PY2TO3 = @PY2TO3PROG@ `@PY2TO3PROG@ -l | grep -v -E "Available|import$$" | awk '{print "-f "$$0}'`
+PY2TO3 = @PY2TO3@ `@PY2TO3@ -l | grep -v -E "Available|import$$" | awk '{print "-f "$$0}'`
 
 python_run: $(PYSCRIPT)
 ifneq (,$(PEP8))

configure.ac

@@ -902,10 +902,17 @@ if test -n "$PYINCLUDE" || test -n "$PY3INCLUDE" ; then
     AC_MSG_RESULT($pep8_version)
   fi
 fi
-AC_ARG_WITH(2to3, AS_HELP_STRING([--with-2to3], [alternate 2to3 executable])
-AS_HELP_STRING([--with-2to3=path], [Specify 2to3 utility path]),[ PY2TO3="$withval"], [PY2TO3="2to3"])
-if [ ! -z "$PYTHON3" ] ; then
-  AC_CHECK_PROGS(PY2TO3PROG, $PY2TO3)
+
+AC_ARG_WITH(2to3, AS_HELP_STRING([--with-2to3=path], [Set location of Python 2to3 tool]), [PY2TO3BIN="$withval"], [PY2TO3BIN="yes"])
+if test -n "$PYTHON3"; then
+  if test "x$PY2TO3BIN" = xyes; then
+    AC_CHECK_PROGS(PY2TO3, 2to3)
+  else
+    PY2TO3="$PY2TO3BIN"
+  fi
+  if test -z "$PY2TO3"; then
+    PYTHON3=
+  fi
 fi
 
 #----------------------------------------------------------------