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Makefile: fix parallel build

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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@schmid-telecom.ch>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Daniel Hobi 2010-01-18 18:13:39 +01:00 committed by Wolfgang Denk
parent 88ffb2665c
commit 2a9987935e
1 changed files with 4 additions and 1 deletions
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5
Makefile
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@ -398,8 +398,11 @@ updater:
env:
$(MAKE) -C tools/env all MTD_VERSION=${MTD_VERSION} || exit 1
# Explicitly make _depend in subdirs containing multiple targets to prevent
# parallel sub-makes creating .depend files simultaneously.
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 = $(SUBDIRS)
TAG_SUBDIRS += $(dir $(__LIBS))