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.h...@schmid-telecom.ch>
---
v3:
- Add a comment why make _depend is required for these two subdirs
v2:
- Also build target depend in $(dir $(LDSCRIPT)) (suggested by Mike)
- Break overlong line
Makefile | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/Makefile b/Makefile
index 793fcec..1ab197b 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))
--
1.6.6
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