[PATCH v2 3/4] build: Honor VPATH to support out-of-tree builds

[simon.kagstrom@xxxxxxxxxxxxxx (Simon Kågström)]

Makes it possible to build out-of-tree, with something like

   cd makedumpfile
   mkdir out-of-tree-build
   cd out-of-tree-build
   make -f ../Makefile

Signed-off-by: Simon Kagstrom <simon.kagstrom at netinsight.net>
---
 Makefile |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index 57e7e44..b9121ad 100644
--- a/Makefile
+++ b/Makefile
@@ -63,19 +63,20 @@ endif
 all: makedumpfile
 
 $(OBJ_PART): $(SRC_PART)
-	$(CC) $(CFLAGS) -c -o ./$@ ./$(@:.o=.c) 
+	$(CC) $(CFLAGS) -c -o ./$@ $(VPATH)$(@:.o=.c)
 
 $(OBJ_ARCH): $(SRC_ARCH)
-	$(CC) $(CFLAGS_ARCH) -c -o ./$@ ./$(@:.o=.c) 
+	@mkdir -p $(@D)
+	$(CC) $(CFLAGS_ARCH) -c -o ./$@ $(VPATH)$(@:.o=.c)
 
 makedumpfile: $(SRC) $(OBJ_PART) $(OBJ_ARCH)
 	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ_PART) $(OBJ_ARCH) -rdynamic -o $@ $< $(LIBS)
 	echo .TH MAKEDUMPFILE 8 \"$(DATE)\" \"makedumpfile v$(VERSION)\" \"Linux System Administrator\'s Manual\" > temp.8
-	grep -v "^.TH MAKEDUMPFILE 8" $(SRC)/makedumpfile.8 >> temp.8
+	grep -v "^.TH MAKEDUMPFILE 8" $(VPATH)makedumpfile.8 >> temp.8
 	mv temp.8 makedumpfile.8
 	gzip -c ./makedumpfile.8 > ./makedumpfile.8.gz
 	echo .TH MAKEDUMPFILE.CONF 5 \"$(DATE)\" \"makedumpfile v$(VERSION)\" \"Linux System Administrator\'s Manual\" > temp.5
-	grep -v "^.TH MAKEDUMPFILE.CONF 5" makedumpfile.conf.5 >> temp.5
+	grep -v "^.TH MAKEDUMPFILE.CONF 5" $(VPATH)makedumpfile.conf.5 >> temp.5
 	mv temp.5 makedumpfile.conf.5
 	gzip -c ./makedumpfile.conf.5 > ./makedumpfile.conf.5.gz
 
@@ -87,7 +88,7 @@ clean:
 
 install:
 	install -m 755 -d ${DESTDIR}/usr/sbin ${DESTDIR}/usr/share/man/man5 ${DESTDIR}/usr/share/man/man8 ${DESTDIR}/etc
-	install -m 755 -t ${DESTDIR}/usr/sbin makedumpfile makedumpfile-R.pl
+	install -m 755 -t ${DESTDIR}/usr/sbin makedumpfile $(VPATH)makedumpfile-R.pl
 	install -m 644 -t ${DESTDIR}/usr/share/man/man8 makedumpfile.8.gz
 	install -m 644 -t ${DESTDIR}/usr/share/man/man5 makedumpfile.conf.5.gz
-	install -m 644 -D makedumpfile.conf ${DESTDIR}/etc/makedumpfile.conf.sample
+	install -m 644 -D $(VPATH)makedumpfile.conf ${DESTDIR}/etc/makedumpfile.conf.sample
-- 
1.7.9.6