Makefile: don't use temporary files in generation of dependency files

These temporary files were a real problem when creating the Debian
package for rt-tests.  debhelper (a generic suite of scripts to ease
packaging) did something like:

	perl -c 'close(STDERR); exec("make distclean");'

which leaked the *.d.$$ files and then wailed that the package contained
untracked changes to the vanilla source.  See
http://bugs.debian.org/570443 for some more details.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

1 files changed, 1 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index 99fbba4..5bb8774 100644
--- a/Makefile
+++ b/Makefile
@@ -43,10 +43,7 @@ VPATH	+= src/lib
 
 # Pattern rule to generate dependency files from .c files
 %.d: %.c
-	@set -e; rm -f $@; \
-	$(CC) -MM $(CFLAGS) $< > $@.$$$$; \
-	sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
-	rm -f $@.$$$$
+	@$(CC) -MM $(CFLAGS) $< | sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' > $@ || rm -f $@
 
 .PHONY: all
 all: $(TARGETS) hwlatdetect