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From: Michael Olbrich <m.olbrich@pengutronix.de>
Date: Wed, 11 Aug 2010 10:44:06 +0200
Subject: [PATCH] fix parallel building
Producing two target with on command results in a race condition:
Both targets are requested, the command is executed twice, and the target
are overwritten randomly.
Solution: Run the command for on target and let the second depend on it.
Then touch the second to make sure it's newer.
Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
---
Makefile.pre.in | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 8e49d84..aced68e 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -546,7 +546,10 @@ Modules/python.o: $(srcdir)/Modules/python.c
$(IO_OBJS): $(IO_H)
-$(GRAMMAR_H) $(GRAMMAR_C): $(PGEN_FOR_BUILD) $(GRAMMAR_INPUT)
+$(GRAMMAR_H): $(GRAMMAR_C)
+ @touch $@
+
+$(GRAMMAR_C): $(PGEN_FOR_BUILD) $(GRAMMAR_INPUT)
-@$(INSTALL) -d Include
-$(PGEN_FOR_BUILD) $(GRAMMAR_INPUT) $(GRAMMAR_H) $(GRAMMAR_C)
--
1.7.1
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