Index: msvc.jam
===================================================================
--- msvc.jam	(revision 80105)
+++ msvc.jam	(working copy)
@@ -311,12 +311,18 @@
 #   -Cp    preserve case of user identifiers
 #   -Cx    preserve case in publics, externs
 #
-actions compile.asm
+rule compile.asm ( targets + : sources * : properties * )
 {
-    $(.ASM) -c -Zp4 -Cp -Cx -D$(DEFINES) $(ASMFLAGS) $(USER_ASMFLAGS) -Fo "$(<:W)" "$(>:W)"
+    get-rspline $(targets) : "-Zp4 -Cp -Cx" ;
+    compile-asm $(targets) : $(sources) ;
 }
 
+actions compile-asm
+{
+    $(.ASM) @"@($(<[1]:W).rsp:E=$(ASM_RSPLINE) -Fo"$(<[1]:W)" $(>[1]:W)")"
+}
 
+
 rule compile.c ( targets + : sources * : properties * )
 {
     C++FLAGS on $(targets[1]) = ;
@@ -1054,6 +1060,9 @@
     CC_RSPLINE on $(target) = [ on $(target) return $(lang-opt) -U$(UNDEFS)
         $(CFLAGS) $(C++FLAGS) $(OPTIONS) -c $(.nl)-D$(DEFINES)
         $(.nl)\"-I$(INCLUDES:W)\" ] ;
+
+    ASM_RSPLINE on $(target) = [ on $(target) return $(lang-opt)
+       $(ASMFLAGS) $(USER_ASMFLAGS) -c $(.nl)-D$(DEFINES) ] ;       
 }
 
 class msvc-linking-generator : linking-generator
@@ -1239,8 +1248,6 @@
     toolset.flags msvc.compile.asm ASMFLAGS <warnings>all : /W4 ;
     toolset.flags msvc.compile.asm ASMFLAGS <warnings-as-errors>on : /WX ;
 
-    toolset.flags msvc.compile.asm DEFINES <define> ;
-
     # Declare flags for linking.
     {
         toolset.flags msvc.link PDB_LINKFLAG <debug-symbols>on/<debug-store>database : /PDB: ;  # not used yet