X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/7f29c468d7bfce620f49ba1c0898bc68e95597f3..5b6bae3445d81a00f0dddf5759aa38d011f90cef:/Bootloaders/makefile

diff --git a/Bootloaders/makefile b/Bootloaders/makefile
index ba4f51259..003069b9a 100644
--- a/Bootloaders/makefile
+++ b/Bootloaders/makefile
@@ -13,7 +13,7 @@
 # custom LUFA library build options are reflected in the compiled
 # code.
 
-PROJECT_DIRECTORIES = $(shell ls -d */)
+PROJECT_DIRECTORIES := $(shell ls -d */)
 
 # This makefile is potentially infinitely recursive if something really bad
 # happens when determining the set of project directories - hard-abort if
@@ -22,16 +22,18 @@ ifeq ($(MAKELEVEL), 10)
    $(error EMERGENCY ABORT: INFINITE RECURSION DETECTED)
 endif
 
-# If building without a per-project object directory, we can't build in parallel
+# Need to special-case building without a per-project object directory
 ifeq ($(OBJDIR),)
-   .NOTPARALLEL:
-
-   # Ensure projects are pre-cleaned if the target is the default or "all"
+   # If no target specified, force "clean all" and disallow parallel build   
    ifeq ($(MAKECMDGOALS),)
       MAKECMDGOALS := clean all
+      .NOTPARALLEL:
    endif
+
+   # If one of the targets is to build, force "clean" beforehand and disallow parallel build   
    ifneq ($(findstring all, $(MAKECMDGOALS)),)
       MAKECMDGOALS := clean $(MAKECMDGOALS)
+      .NOTPARALLEL:
    endif
 endif