Slightly better method of recursive make - use proper make dependencies to allow...

[pub/USBasp.git] / Bootloaders / makefile

diff --git a/Bootloaders/makefile b/Bootloaders/makefile
index c9f4941..ba4f512 100644 (file)
--- a/Bootloaders/makefile
+++ b/Bootloaders/makefile
@@ -13,18 +13,32 @@
 # custom LUFA library build options are reflected in the compiled
 # code.
 
-all:
-       $(MAKE) -C CDC clean
-       $(MAKE) -C CDC all
+PROJECT_DIRECTORIES = $(shell ls -d */)
 
-       $(MAKE) -C HID clean
-       $(MAKE) -C HID all
+# This makefile is potentially infinitely recursive if something really bad
+# happens when determining the set of project directories - hard-abort if
+# more than 10 levels deep to avoid angry emails.
+ifeq ($(MAKELEVEL), 10)
+   $(error EMERGENCY ABORT: INFINITE RECURSION DETECTED)
+endif
 
-       $(MAKE) -C DFU clean
-       $(MAKE) -C DFU all
+# If building without a per-project object directory, we can't build in parallel
+ifeq ($(OBJDIR),)
+   .NOTPARALLEL:
 
-%:
-       $(MAKE) -C CDC $@
-       $(MAKE) -C DFU $@
-       $(MAKE) -C HID $@
+   # Ensure projects are pre-cleaned if the target is the default or "all"
+   ifeq ($(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)