diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index f3cf57efdb3..34f0b3e475b 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,13 @@
+2012-02-24  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	* gcc-interface/Makefile.in (WIN_SO_PREFIX [windows targets]): New
+	Windows-specific make variable.
+	(WIN_SO_INSTALL_DIR [windows targets]): Likewise.
+	(install-gnatlib): Respect the above during installation when set,
+	and also install any windows import library that has been built.
+	(gnatlib-shared-win32): Use WIN_SO_PREFIX to name output DLL and also
+	build a corresponding import library.
+
 2012-02-22  Robert Dewar  <dewar@adacore.com>
 
 	* exp_util.adb, make.adb, sem_dim.adb, sem_ch4.adb, exp_disp.adb: Minor
diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
index 72569032a10..5fa6ffa0702 100644
--- a/gcc/ada/gcc-interface/Makefile.in
+++ b/gcc/ada/gcc-interface/Makefile.in
@@ -1589,16 +1589,19 @@ ifeq ($(strip $(filter-out cygwin% mingw32% pe,$(osys))),)
   # the Cygwin port has always been a CygMing frankenhybrid and it is
   # a long-term project to disentangle them.
   ifeq ($(strip $(filter-out cygwin%,$(osys))),)
+    WIN_SO_PREFIX=cyg
     LIBGNAT_TARGET_PAIRS = \
     s-memory.adb<s-memory.adb \
     g-socthi.ads<g-socthi.ads \
     g-socthi.adb<g-socthi.adb
   else
+    WIN_SO_PREFIX=lib
     LIBGNAT_TARGET_PAIRS = \
     s-memory.adb<s-memory-mingw.adb \
     g-socthi.ads<g-socthi-mingw.ads \
     g-socthi.adb<g-socthi-mingw.adb
   endif
+  WIN_SO_INSTALL_DIR = $(bindir)
   LIBGNAT_TARGET_PAIRS += \
   a-dirval.adb<a-dirval-mingw.adb \
   a-excpol.adb<a-excpol-abort.adb \
@@ -2449,11 +2452,14 @@ install-gnatlib: ../stamp-gnatlib-$(RTSDIR)
 #     for shared libraries on some targets, e.g. on HP-UX where the x
 #     permission is required.
 #     Also install the .dSYM directories if they exist (these directories
-#     contain the debug information for the shared libraries on darwin)
+#     contain the debug information for the shared libraries on darwin),
+#     and the windows import libraries if they exist.
+	libpfx=$(if $(WIN_SO_PREFIX),$(WIN_SO_PREFIX),lib); \
+	librtlobjdir=$(if $(WIN_SO_INSTALL_DIR),$(WIN_SO_INSTALL_DIR),$(ADA_RTL_OBJ_DIR)); \
 	for file in gnat gnarl; do \
-	   if [ -f $(RTSDIR)/lib$${file}$(hyphen)$(LIBRARY_VERSION)$(soext) ]; then \
-	      $(INSTALL) $(RTSDIR)/lib$${file}$(hyphen)$(LIBRARY_VERSION)$(soext) \
-			 $(DESTDIR)$(ADA_RTL_OBJ_DIR); \
+	   if [ -f $(RTSDIR)/$${libpfx}$${file}$(hyphen)$(LIBRARY_VERSION)$(soext) ]; then \
+	      $(INSTALL) $(RTSDIR)/$${libpfx}$${file}$(hyphen)$(LIBRARY_VERSION)$(soext) \
+			 $(DESTDIR)$${librtlobjdir}; \
 	   fi; \
 	   if [ -f $(RTSDIR)/lib$${file}$(soext) ]; then \
 	      $(LN_S) lib$${file}$(hyphen)$(LIBRARY_VERSION)$(soext) \
@@ -2463,6 +2469,10 @@ install-gnatlib: ../stamp-gnatlib-$(RTSDIR)
 	      $(CP) -r $(RTSDIR)/lib$${file}$(hyphen)$(LIBRARY_VERSION)$(soext).dSYM \
 	        $(DESTDIR)$(ADA_RTL_OBJ_DIR); \
 	   fi; \
+	   if [ -f $(RTSDIR)/lib$${file}$(hyphen)$(LIBRARY_VERSION)$(soext)$(arext) ]; then \
+	      $(INSTALL_DATA) $(RTSDIR)/lib$${file}$(hyphen)$(LIBRARY_VERSION)$(soext)$(arext) \
+			 $(DESTDIR)$(ADA_RTL_OBJ_DIR); \
+	   fi; \
 	done
 # This copy must be done preserving the date on the original file.
 	for file in $(RTSDIR)/*.ad?; do \
@@ -2674,16 +2684,18 @@ gnatlib-shared-win32:
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
                 | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -shared -shared-libgcc \
 		$(PICFLAG_FOR_TARGET) \
-		-o libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
+		-o $(WIN_SO_PREFIX)gnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
+		-Wl,-out-implib,libgnat$(hyphen)$(LIBRARY_VERSION)$(soext)$(arext) \
 		$(GNATRTL_NONTASKING_OBJS) $(LIBGNAT_OBJS) \
-		$(SO_OPTS)libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) $(MISCLIB)
+		$(SO_OPTS)$(WIN_SO_PREFIX)gnat$(hyphen)$(LIBRARY_VERSION)$(soext) $(MISCLIB)
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
                 | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -shared -shared-libgcc \
 		$(PICFLAG_FOR_TARGET) \
-		-o libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
+		-o $(WIN_SO_PREFIX)gnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
+		-Wl,-out-implib,libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext)$(arext) \
 		$(GNATRTL_TASKING_OBJS) \
-		$(SO_OPTS)libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
-		$(THREADSLIB) -Wl,libgnat$(hyphen)$(LIBRARY_VERSION)$(soext)
+		$(SO_OPTS)$(WIN_SO_PREFIX)gnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
+		$(THREADSLIB) -L. -lgnat$(hyphen)$(LIBRARY_VERSION)
 
 gnatlib-shared-darwin:
 	$(MAKE) $(FLAGS_TO_PASS) \
diff --git a/libada/ChangeLog b/libada/ChangeLog
index 9a0db22cf8a..256ccccf016 100644
--- a/libada/ChangeLog
+++ b/libada/ChangeLog
@@ -1,3 +1,7 @@
+2012-02-24  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	* Makefile.in (bindir): Import from autoconf and pass down to submake.
+
 2012-01-22  Douglas B Rupp  <rupp@gnat.com>
 
 	* configure: Regenerate.
diff --git a/libada/Makefile.in b/libada/Makefile.in
index 5389dd005de..36cf5ad5e5a 100644
--- a/libada/Makefile.in
+++ b/libada/Makefile.in
@@ -33,6 +33,7 @@ MULTICLEAN = true
 SHELL = @SHELL@
 srcdir = @srcdir@
 libdir = @libdir@
+bindir = @bindir@
 build = @build@
 target = @target@
 prefix = @prefix@
@@ -83,6 +84,7 @@ LIBADA_FLAGS_TO_PASS = \
         "TRACE=$(TRACE)" \
         "MULTISUBDIR=$(MULTISUBDIR)" \
         "libsubdir=$(libsubdir)" \
+        "bindir=$(bindir)" \
         "objext=$(objext)" \
         "prefix=$(prefix)" \
         "exeext=.exeext.should.not.be.used " \