Add an additional link step with linking all Mini-OS kernel binaries
into a single object file.

This is done in preparation of hiding Mini-OS internal symbols before
linking the kernel with libraries and an application.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
 Makefile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 7ee181a2..85c6db75 100644
--- a/Makefile
+++ b/Makefile
@@ -164,8 +164,11 @@ endif
 $(OBJ_DIR)/arch/x86/minios-x86%.lds:  arch/x86/minios-x86.lds.S
 	$(CPP) $(ASFLAGS) -P $< -o $@
 
-$(OBJ_DIR)/$(TARGET): $(OBJS) $(APP_O) arch_lib $(OBJ_DIR)/$(TARGET_ARCH_DIR)/minios-$(MINIOS_TARGET_ARCH).lds
-	$(LD) -r $(LDFLAGS) $(HEAD_OBJ) $(APP_O) $(OBJS) $(LDARCHLIB) $(LDLIBS) -o $@.o
+$(OBJ_DIR)/$(TARGET)-kern.o: $(OBJS) arch_lib $(OBJ_DIR)/$(TARGET_ARCH_DIR)/minios-$(MINIOS_TARGET_ARCH).lds
+	$(LD) -r $(LDFLAGS) $(HEAD_OBJ) $(OBJS) $(LDARCHLIB) -o $@
+
+$(OBJ_DIR)/$(TARGET): $(OBJ_DIR)/$(TARGET)-kern.o $(APP_O)
+	$(LD) -r $(LDFLAGS) $(OBJ_DIR)/$(TARGET)-kern.o $(APP_O) $(LDLIBS) -o $@.o
 	$(OBJCOPY) -w -G $(GLOBAL_PREFIX)* -G _start $@.o $@.o
 	$(LD) $(LDFLAGS) $(LDFLAGS_FINAL) $@.o $(EXTRA_OBJS) -o $@-debug
 	strip -s $@-debug -o $@
-- 
2.35.3