win32/configure.bat: Add --with-dump-ast option

Author: nobu

win32/Makefile.sub

@@ -558,7 +558,12 @@ ACTIONS_ENDGROUP = @::
 
 ABI_VERSION_HDR = $(hdrdir)/ruby/internal/abi.h
 
+!if defined(DUMP_AST)
+DUMP_AST_TARGET = no
+!else
 DUMP_AST = dump_ast$(EXEEXT)
+DUMP_AST_TARGET = $(DUMP_AST)
+!endif
 
 !include $(srcdir)/common.mk
 

win32/configure.bat

@@ -183,6 +183,7 @@ goto :loop ;
   if "%opt%" == "--with-gmp-dir" goto :opt-dir
   if "%opt%" == "--with-gmp" goto :gmp
   if "%opt%" == "--with-destdir" goto :destdir
+  if "%opt%" == "--with-dump-ast" goto :dump-ast
 goto :loop ;
 :ntver
   ::- For version constants, see
@@ -232,6 +233,9 @@ goto :loop ;
 :destdir
   echo>> %config_make% DESTDIR = %arg%
 goto :loop ;
+:dump-ast
+  echo>> %config_make% DUMP_AST = %arg%
+goto :loop ;
 :opt-dir
   if "%arg%" == "" (
     echo 1>&2 %configure%: missing argument for %opt%