X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/d887c0c73cbfc16a1e51207041fd94399de70c29..7f29c468d7bfce620f49ba1c0898bc68e95597f3:/Demos/DualRole/ClassDriver/makefile

diff --git a/Demos/DualRole/ClassDriver/makefile b/Demos/DualRole/ClassDriver/makefile
index a6ccbf1c3..71fb805ef 100644
--- a/Demos/DualRole/ClassDriver/makefile
+++ b/Demos/DualRole/ClassDriver/makefile
@@ -22,9 +22,23 @@ ifeq ($(MAKELEVEL), 10)
    $(error EMERGENCY ABORT: INFINITE RECURSION DETECTED)
 endif
 
-all:
-	@$(foreach PROJECT, $(PROJECT_DIRECTORIES), $(MAKE) -s -C $(PROJECT) clean all;)
+# If building without a per-project object directory, we can't build in parallel
+ifeq ($(OBJDIR),)
+   .NOTPARALLEL:
 
-%:
-	@$(foreach PROJECT, $(PROJECT_DIRECTORIES), $(MAKE) -s -C $(PROJECT) $@;)
+   # Ensure projects are pre-cleaned if the target is the default or "all"
+   ifeq ($(MAKECMDGOALS),)
+      MAKECMDGOALS := clean all
+   endif
+   ifneq ($(findstring all, $(MAKECMDGOALS)),)
+      MAKECMDGOALS := clean $(MAKECMDGOALS)
+   endif
+endif
+
+%: $(PROJECT_DIRECTORIES)
+	@echo . > /dev/null
 
+$(PROJECT_DIRECTORIES):
+	@$(MAKE) -C $@ $(MAKECMDGOALS)
+    
+.PHONY: $(PROJECT_DIRECTORIES)