From: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Date: Wed, 5 Oct 2005 10:06:11 +0000 (-0000)
Subject: - Fix spurious rebuilds for (parallel) out-of-tree builds.
X-Git-Tag: 1_1_0~598
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7abe7098676aeb0654ef0159f589484b4cf520e8;p=platform%2Fupstream%2Fbusybox.git

- Fix spurious rebuilds for (parallel) out-of-tree builds.
  Make sure that the directories are order-only prerequisites. Otherwise we
  may have object files created after the timestamp of the directory was
  updated which would lead to spurious rebuilds (as some of the dentries
  may be older than the dir itself).
---

diff --git a/e2fsprogs/Makefile.in b/e2fsprogs/Makefile.in
index 46a684e..546cc83 100644
--- a/e2fsprogs/Makefile.in
+++ b/e2fsprogs/Makefile.in
@@ -7,9 +7,9 @@
 E2FSPROGS_AR:=e2fsprogs.a
 
 E2FSPROGS_DIR:=$(top_builddir)/e2fsprogs
-E2FSPROGS_INC:=$(top_srcdir)/e2fsprogs
+E2FSPROGS_SRC:=$(top_srcdir)/e2fsprogs
 
-E2FSPROGS_CFLAGS := -I$(E2FSPROGS_INC) -include $(E2FSPROGS_INC)/e2fsbb.h
+E2FSPROGS_CFLAGS := -I$(E2FSPROGS_SRC) -include $(E2FSPROGS_SRC)/e2fsbb.h
 
 BLKID_SRC   := cache.c dev.c devname.c devno.c blkid_getsize.c \
 	       probe.c read.c resolve.c save.c tag.c
@@ -42,13 +42,17 @@ UUID_OBJS   := $(patsubst %.c,%.o, $(UUID_SRCS))
 # for building out-of-tree we need to make sure that the directories to hold
 # the object tree are created
 $(patsubst %,$(E2FSPROGS_DIR)/%, blkid e2fsck e2p ext2fs uuid):
-	mkdir -p "$@"
+	@mkdir -p "$@"
 
-$(patsubst %,$(E2FSPROGS_DIR)/%, $(BLKID_OBJS)):$(E2FSPROGS_DIR)/blkid
-$(patsubst %,$(E2FSPROGS_DIR)/%, $(E2FSCK_OBJS)):$(E2FSPROGS_DIR)/e2fsck
-$(patsubst %,$(E2FSPROGS_DIR)/%, $(E2P_OBJS)):$(E2FSPROGS_DIR)/e2p
-$(patsubst %,$(E2FSPROGS_DIR)/%, $(EXT2FS_OBJS)):$(E2FSPROGS_DIR)/ext2fs
-$(patsubst %,$(E2FSPROGS_DIR)/%, $(UUID_OBJS)):$(E2FSPROGS_DIR)/uuid
+# make sure that the directories are order-only prerequisites. Otherwise we
+# may have object files created after the timestamp of the directory was
+# updated which would lead to spurious rebuilds (as some of the dentries
+# may be older than the dir itself).
+$(patsubst %,$(E2FSPROGS_DIR)/%, $(BLKID_OBJS)):|$(E2FSPROGS_DIR)/blkid
+$(patsubst %,$(E2FSPROGS_DIR)/%, $(E2FSCK_OBJS)):|$(E2FSPROGS_DIR)/e2fsck
+$(patsubst %,$(E2FSPROGS_DIR)/%, $(E2P_OBJS)):|$(E2FSPROGS_DIR)/e2p
+$(patsubst %,$(E2FSPROGS_DIR)/%, $(EXT2FS_OBJS)):|$(E2FSPROGS_DIR)/ext2fs
+$(patsubst %,$(E2FSPROGS_DIR)/%, $(UUID_OBJS)):|$(E2FSPROGS_DIR)/uuid
 
 E2FSPROGS-y:=
 E2FSPROGS-$(CONFIG_CHATTR)     += chattr.o $(E2P_OBJS)