--- a/hotspot/make/windows/makefiles/defs.make	Thu Aug 02 14:54:14 2012 -0700
+++ b/hotspot/make/windows/makefiles/defs.make	Fri Aug 03 18:34:28 2012 -0700
@@ -188,14 +188,22 @@
   MAKE_ARGS += JDK_BUILD_NUMBER=$(COOKED_BUILD_NUMBER)
 endif
 
-NMAKE= MAKEFLAGS= MFLAGS= nmake /NOLOGO
+NMAKE= MAKEFLAGS= MFLAGS= nmake -NOLOGO
+ifndef SYSTEM_UNAME
+  SYSTEM_UNAME := $(shell uname)
+  export SYSTEM_UNAME
+endif
 
 # Check for CYGWIN
-ifneq (,$(findstring CYGWIN,$(shell uname)))
+ifneq (,$(findstring CYGWIN,$(SYSTEM_UNAME)))
   USING_CYGWIN=true
 else
   USING_CYGWIN=false
 endif
+# Check for MinGW
+ifneq (,$(findstring MINGW,$(SYSTEM_UNAME)))
+  USING_MINGW=true
+endif
 # FIXUP: The subdirectory for a debug build is NOT the same on all platforms
 VM_DEBUG=debug
 
@@ -208,11 +216,16 @@
   ABS_BOOTDIR     := $(subst /,\\,$(shell /bin/cygpath -m -a "$(BOOTDIR)"))
   ABS_GAMMADIR    := $(subst /,\\,$(shell /bin/cygpath -m -a "$(GAMMADIR)"))
   ABS_OS_MAKEFILE := $(shell /bin/cygpath -m -a "$(HS_MAKE_DIR)/$(OSNAME)")/build.make
-else
-  ABS_OUTPUTDIR   := $(subst /,\\,$(shell $(CD) $(OUTPUTDIR);$(PWD)))
-  ABS_BOOTDIR     := $(subst /,\\,$(shell $(CD) $(BOOTDIR);$(PWD)))
-  ABS_GAMMADIR    := $(subst /,\\,$(shell $(CD) $(GAMMADIR);$(PWD)))
-  ABS_OS_MAKEFILE := $(subst /,\\,$(shell $(CD) $(HS_MAKE_DIR)/$(OSNAME);$(PWD))/build.make)
+else ifeq ($(USING_MINGW), true)
+    ABS_OUTPUTDIR   := $(shell $(CD) $(OUTPUTDIR);$(PWD))
+    ABS_BOOTDIR     := $(shell $(CD) $(BOOTDIR);$(PWD))
+    ABS_GAMMADIR    := $(shell $(CD) $(GAMMADIR);$(PWD))
+    ABS_OS_MAKEFILE := $(shell $(CD) $(HS_MAKE_DIR)/$(OSNAME);$(PWD))/build.make
+  else
+    ABS_OUTPUTDIR   := $(subst /,\\,$(shell $(CD) $(OUTPUTDIR);$(PWD)))
+    ABS_BOOTDIR     := $(subst /,\\,$(shell $(CD) $(BOOTDIR);$(PWD)))
+    ABS_GAMMADIR    := $(subst /,\\,$(shell $(CD) $(GAMMADIR);$(PWD)))
+    ABS_OS_MAKEFILE := $(subst /,\\,$(shell $(CD) $(HS_MAKE_DIR)/$(OSNAME);$(PWD))/build.make)
 endif
 
 # Disable building SA on windows until we are sure

--- a/hotspot/make/windows/makefiles/rules.make	Thu Aug 02 14:54:14 2012 -0700
+++ b/hotspot/make/windows/makefiles/rules.make	Fri Aug 03 18:34:28 2012 -0700
@@ -23,14 +23,15 @@
 #
 
 # These are the commands used externally to compile and run.
-
+# The \ are used here for traditional Windows apps and " quoted to get
+# past the Unix-like shell:
 !ifdef BootStrapDir
-RUN_JAVA=$(BootStrapDir)\bin\java
-RUN_JAVAP=$(BootStrapDir)\bin\javap
-RUN_JAVAH=$(BootStrapDir)\bin\javah
-RUN_JAR=$(BootStrapDir)\bin\jar
-COMPILE_JAVAC=$(BootStrapDir)\bin\javac $(BOOTSTRAP_JAVAC_FLAGS)
-COMPILE_RMIC=$(BootStrapDir)\bin\rmic
+RUN_JAVA="$(BootStrapDir)\bin\java"
+RUN_JAVAP="$(BootStrapDir)\bin\javap"
+RUN_JAVAH="$(BootStrapDir)\bin\javah"
+RUN_JAR="$(BootStrapDir)\bin\jar"
+COMPILE_JAVAC="$(BootStrapDir)\bin\javac" $(BOOTSTRAP_JAVAC_FLAGS)
+COMPILE_RMIC="$(BootStrapDir)\bin\rmic"
 BOOT_JAVA_HOME=$(BootStrapDir)
 !else
 RUN_JAVA=java

--- a/hotspot/make/windows/makefiles/sa.make	Thu Aug 02 14:54:14 2012 -0700
+++ b/hotspot/make/windows/makefiles/sa.make	Fri Aug 03 18:34:28 2012 -0700
@@ -36,37 +36,37 @@
 !include $(WorkSpace)/make/windows/makefiles/rules.make
 !include $(WorkSpace)/make/sa.files
 
-GENERATED = ..\generated
+GENERATED = ../generated
 
 # tools.jar is needed by the JDI - SA binding
-SA_CLASSPATH = $(BOOT_JAVA_HOME)\lib\tools.jar
+SA_CLASSPATH = $(BOOT_JAVA_HOME)/lib/tools.jar
 
-SA_CLASSDIR = $(GENERATED)\saclasses
+SA_CLASSDIR = $(GENERATED)/saclasses
 
 SA_BUILD_VERSION_PROP = sun.jvm.hotspot.runtime.VM.saBuildVersion=$(SA_BUILD_VERSION)
 
-SA_PROPERTIES = $(SA_CLASSDIR)\sa.properties
+SA_PROPERTIES = $(SA_CLASSDIR)/sa.properties
 
-default::  $(GENERATED)\sa-jdi.jar
+default::  $(GENERATED)/sa-jdi.jar
 
 # Remove the space between $(SA_BUILD_VERSION_PROP) and > below as it adds a white space
 # at the end of SA version string and causes a version mismatch with the target VM version.
 
-$(GENERATED)\sa-jdi.jar: $(AGENT_FILES:/=\)
-	@if not exist $(SA_CLASSDIR) mkdir $(SA_CLASSDIR)
-	@echo ...Building sa-jdi.jar
+$(GENERATED)/sa-jdi.jar: $(AGENT_FILES)
+	$(QUIETLY) mkdir -p $(SA_CLASSDIR)
+	@echo ...Building sa-jdi.jar into $(SA_CLASSDIR)
 	@echo ...$(COMPILE_JAVAC) -classpath $(SA_CLASSPATH) -d $(SA_CLASSDIR) ....
-	@$(COMPILE_JAVAC) -classpath $(SA_CLASSPATH) -sourcepath $(AGENT_SRC_DIR) -d $(SA_CLASSDIR) $(AGENT_FILES:/=\)
+	@$(COMPILE_JAVAC) -classpath $(SA_CLASSPATH) -sourcepath $(AGENT_SRC_DIR) -d $(SA_CLASSDIR) $(AGENT_FILES)
 	$(COMPILE_RMIC) -classpath $(SA_CLASSDIR) -d $(SA_CLASSDIR) sun.jvm.hotspot.debugger.remote.RemoteDebuggerServer
 	$(QUIETLY) echo $(SA_BUILD_VERSION_PROP)> $(SA_PROPERTIES)
 	$(QUIETLY) rm -f $(SA_CLASSDIR)/sun/jvm/hotspot/utilities/soql/sa.js
 	$(QUIETLY) cp $(AGENT_SRC_DIR)/sun/jvm/hotspot/utilities/soql/sa.js $(SA_CLASSDIR)/sun/jvm/hotspot/utilities/soql
 	$(QUIETLY) rm -rf $(SA_CLASSDIR)/sun/jvm/hotspot/ui/resources
-	$(QUIETLY) mkdir $(SA_CLASSDIR)\sun\jvm\hotspot\ui\resources
+	$(QUIETLY) mkdir $(SA_CLASSDIR)/sun/jvm/hotspot/ui/resources
 	$(QUIETLY) cp $(AGENT_SRC_DIR)/sun/jvm/hotspot/ui/resources/*.png $(SA_CLASSDIR)/sun/jvm/hotspot/ui/resources
 	$(QUIETLY) cp -r $(AGENT_SRC_DIR)/images/* $(SA_CLASSDIR)
 	$(RUN_JAR) cf $@ -C $(SA_CLASSDIR) .
-	$(RUN_JAR) uf $@ -C $(AGENT_SRC_DIR:/=\) META-INF\services\com.sun.jdi.connect.Connector
+	$(RUN_JAR) uf $@ -C $(AGENT_SRC_DIR) META-INF/services/com.sun.jdi.connect.Connector
 	$(RUN_JAVAH) -classpath $(SA_CLASSDIR) -jni sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal
 	$(RUN_JAVAH) -classpath $(SA_CLASSDIR) -jni sun.jvm.hotspot.debugger.x86.X86ThreadContext 
 	$(RUN_JAVAH) -classpath $(SA_CLASSDIR) -jni sun.jvm.hotspot.debugger.ia64.IA64ThreadContext 
@@ -85,27 +85,27 @@
 # will be useful to have the assertion checks in place
 
 !if "$(BUILDARCH)" == "ia64"
-SA_CFLAGS = /nologo $(MS_RUNTIME_OPTION) /W3 $(GX_OPTION) /Od /D "WIN32" /D "WIN64" /D "_WINDOWS" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+SA_CFLAGS = -nologo $(MS_RUNTIME_OPTION) -W3 $(GX_OPTION) -Od -D "WIN32" -D "WIN64" -D "_WINDOWS" -D "_DEBUG" -D "_CONSOLE" -D "_MBCS" -YX -FD -c
 !elseif "$(BUILDARCH)" == "amd64"
-SA_CFLAGS = /nologo $(MS_RUNTIME_OPTION) /W3 $(GX_OPTION) /Od /D "WIN32" /D "WIN64" /D "_WINDOWS" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+SA_CFLAGS = -nologo $(MS_RUNTIME_OPTION) -W3 $(GX_OPTION) -Od -D "WIN32" -D "WIN64" -D "_WINDOWS" -D "_DEBUG" -D "_CONSOLE" -D "_MBCS" -YX -FD -c
 !if "$(COMPILER_NAME)" == "VS2005"
 # On amd64, VS2005 compiler requires bufferoverflowU.lib on the link command line, 
 # otherwise we get missing __security_check_cookie externals at link time. 
 SA_LD_FLAGS = bufferoverflowU.lib
 !endif
 !else
-SA_CFLAGS = /nologo $(MS_RUNTIME_OPTION) /W3 /Gm $(GX_OPTION) /Od /D "WIN32" /D "_WINDOWS" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+SA_CFLAGS = -nologo $(MS_RUNTIME_OPTION) -W3 -Gm $(GX_OPTION) -Od -D "WIN32" -D "_WINDOWS" -D "_DEBUG" -D "_CONSOLE" -D "_MBCS" -YX -FD -GZ -c
 !if "$(ENABLE_FULL_DEBUG_SYMBOLS)" == "1"
-SA_CFLAGS = $(SA_CFLAGS) /ZI
+SA_CFLAGS = $(SA_CFLAGS) -ZI
 !endif
 !endif
 !if "$(MT)" != ""
-SA_LD_FLAGS = /manifest $(SA_LD_FLAGS)
+SA_LD_FLAGS = -manifest $(SA_LD_FLAGS)
 !endif
 SASRCFILE = $(AGENT_DIR)/src/os/win32/windbg/sawindbg.cpp
-SA_LFLAGS = $(SA_LD_FLAGS) /nologo /subsystem:console /machine:$(MACHINE)
+SA_LFLAGS = $(SA_LD_FLAGS) -nologo -subsystem:console -machine:$(MACHINE)
 !if "$(ENABLE_FULL_DEBUG_SYMBOLS)" == "1"
-SA_LFLAGS = $(SA_LFLAGS) /map /debug
+SA_LFLAGS = $(SA_LFLAGS) -map -debug
 !endif
 
 # Note that we do not keep sawindbj.obj around as it would then
@@ -117,15 +117,15 @@
 $(SAWINDBG): $(SASRCFILE)
 	set INCLUDE=$(SA_INCLUDE)$(INCLUDE)
 	$(CXX) @<<
-	  /I"$(BootStrapDir)/include" /I"$(BootStrapDir)/include/win32" 
-	  /I"$(GENERATED)" $(SA_CFLAGS)
+	  -I"$(BootStrapDir)/include" -I"$(BootStrapDir)/include/win32" 
+	  -I"$(GENERATED)" $(SA_CFLAGS)
 	  $(SASRCFILE)
-	  /out:$*.obj
+	  -out:$*.obj
 <<
 	set LIB=$(SA_LIB)$(LIB)
-	$(LD) /out:$@ /DLL $*.obj dbgeng.lib $(SA_LFLAGS)
+	$(LD) -out:$@ -DLL $*.obj dbgeng.lib $(SA_LFLAGS)
 !if "$(MT)" != ""
-	$(MT) /manifest $(@F).manifest /outputresource:$(@F);#2
+	$(MT) -manifest $(@F).manifest -outputresource:$(@F);#2
 !endif
 !if "$(ENABLE_FULL_DEBUG_SYMBOLS)" == "1"
 !if "$(ZIP_DEBUGINFO_FILES)" == "1"
@@ -136,6 +136,6 @@
 	-@rm -f $*.obj
 
 cleanall :
-	rm -rf $(GENERATED:\=/)/saclasses
-	rm -rf $(GENERATED:\=/)/sa-jdi.jar
+	rm -rf $(GENERATED)/saclasses
+	rm -rf $(GENERATED)/sa-jdi.jar
 !endif

--- a/hotspot/make/windows/makefiles/shared.make	Thu Aug 02 14:54:14 2012 -0700
+++ b/hotspot/make/windows/makefiles/shared.make	Fri Aug 03 18:34:28 2012 -0700
@@ -36,11 +36,12 @@
 
 
 !ifdef SUBDIRS
+# \ is used below because $(MAKE) is nmake here, which expects Windows paths
 $(SUBDIRS): FORCE
 	@if not exist $@ mkdir $@
-	@if not exist $@\local.make echo # Empty > $@\local.make
-	@echo nmake $(ACTION) in $(DIR)\$@
-	cd $@ && $(MAKE) /NOLOGO /f $(WorkSpace)\make\windows\makefiles\$@.make $(ACTION) DIR=$(DIR)\$@ BUILD_FLAVOR=$(BUILD_FLAVOR)
+	@if not exist $@/local.make echo # Empty > $@/local.make
+	@echo nmake $(ACTION) in $(DIR)/$@
+	cd $@ && $(MAKE) -NOLOGO -f $(WorkSpace)\make\windows\makefiles\$@.make $(ACTION) DIR=$(DIR)\$@ BUILD_FLAVOR=$(BUILD_FLAVOR)
 !endif
 
 # Creates the needed directory