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

[Daniel Hobi]

During parallel build, the top Makefile spawns multiple sub-makes
for targets in cpu/$(CPU). If cpu/$(CPU)/.depend is not present, the
sub-makes may end up generating this file simultaneously which leads
to corrupted content.

A typical error message is:

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

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

Signed-off-by: Daniel Hobi <daniel.hobi at schmid-telecom.ch>
---
 Makefile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Makefile b/Makefile
index 19b5ac0..2fd22c7 100644
--- a/Makefile
+++ b/Makefile
@@ -400,7 +400,7 @@ 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 $$dir _depend ; done
+		for dir in $(SUBDIRS) cpu/$(CPU); do $(MAKE) -C $$dir _depend ; done
 
 TAG_SUBDIRS += include
 TAG_SUBDIRS += lib_generic board/$(BOARDDIR)
-- 
1.6.5.4