[U-Boot] [PATCH v2] Makefile: fix parallel build

[Daniel Hobi]

During parallel build, the top Makefile spawns multiple sub-makes for
targets in cpu/$(CPU) and $(dir $(LDSCRIPT)). If the .depend files are
not present in these directories, the sub-makes may end up generating
these files simultaneously which leads to corrupted content.

A typical error message is:

.depend:39: *** multiple target patterns.  Stop.

This patch serializes the creation of .depend in cpu/$(CPU) and
$(dir $(LDSCRIPT)) by adding these directories to the depend target
in the top Makefile.

Other directories in $(LIBS) are not affected since they contain only
one Make target and thus only one sub-make is spawned per directory.

Signed-off-by: Daniel Hobi <daniel.hobi at schmid-telecom.ch>
---
v2:
 - Break overlong line
 - Add comment about other directories to commit message
 - Also build target _depend in $(dir $(LDSCRIPT)) (as suggested by Mike)
   This requires the Makefile in $(dir $(LDSCRIPT)) to provide a
   _depend target, which is the case for all LDSCRIPT values in the
   current tree

diff --git a/Makefile b/Makefile
index 19b5ac0..e9be7a5 100644
--- a/Makefile
+++ b/Makefile
@@ -400,7 +400,8 @@ env:
 		$(MAKE) -C tools/env all MTD_VERSION=${MTD_VERSION} || exit 1
 
 depend dep:	$(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
-		for dir in $(SUBDIRS) ; do $(MAKE) -C $$dir _depend ; done
+		for dir in $(SUBDIRS) cpu/$(CPU) $(dir $(LDSCRIPT)) ; do \
+			$(MAKE) -C $$dir _depend ; done
 
 TAG_SUBDIRS += include
 TAG_SUBDIRS += lib_generic board/$(BOARDDIR)
-- 
1.6.5.4