From 01c2ad58d34d33cbc706cee67df306c1a6d636e8 Mon Sep 17 00:00:00 2001
From: John Kacur <jkacur@redhat.com>
Date: Wed, 14 Oct 2015 14:39:33 +0200
Subject: Makefile: OBJDIR should be an order-only-prerequisite

OBJDIR should be an order only prerequisite.
- create the OBJDIR if necessary before .d, .o and before all TARGETS
  including hwlatdetect
- Don't rebuild if the timestamp on the OBJDIR changes

Signed-off-by: John Kacur <jkacur@redhat.com>
---
 Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 1c3ae50..37ab159 100644
--- a/Makefile
+++ b/Makefile
@@ -85,15 +85,15 @@ VPATH	+= src/backfire:
 VPATH	+= src/lib:
 VPATH	+= src/hackbench:
 
-$(OBJDIR)/%.o: %.c
+$(OBJDIR)/%.o: %.c | $(OBJDIR)
 	$(CC) -D VERSION=$(VERSION) -c $< $(CFLAGS) $(CPPFLAGS) -o $@
 
 # Pattern rule to generate dependency files from .c files
-$(OBJDIR)/%.d: %.c
+$(OBJDIR)/%.d: %.c | $(OBJDIR)
 	@$(CC) -MM $(CFLAGS) $(CPPFLAGS) $< | sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' > $@ || rm -f $@
 
 .PHONY: all
-all: $(OBJDIR) $(TARGETS) hwlatdetect
+all: $(TARGETS) hwlatdetect | $(OBJDIR)
 
 $(OBJDIR):
 	mkdir $(OBJDIR)
-- 
cgit 1.2.3-korg