From 2a9987935e3cdb61e7550c87cbc9f500a54f672d Mon Sep 17 00:00:00 2001 From: Daniel Hobi Date: Mon, 18 Jan 2010 18:13:39 +0100 Subject: Makefile: fix parallel build 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 Signed-off-by: Mike Frysinger --- Makefile | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 793fcec1dc..1ab197b4df 100644 --- a/Makefile +++ b/Makefile @@ -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)) -- cgit v1.2.3