[PATCH] better allow builds of extras programs under udev

Here is an improved version of the patch that enables builds of the extras
progams for the targets all, clean, install, and uninstall, and passes
down the "prefix" for use by install and uninstall.

This patch enables building of the "extras" programs using the same build
environment as udev (i.e. build with udev's versions of klibc and
sysfsutils).

For example, build scsi_id and udev via:

	make EXTRAS=extras/scsi_id

Build scsi_id and udev with klibc via:

	make KLIBC=true EXTRAS=extras/scsi_id

Makefile

@@ -42,6 +42,9 @@ INSTALL_PROGRAM = ${INSTALL}
 INSTALL_DATA  = ${INSTALL} -m 644
 INSTALL_SCRIPT = ${INSTALL_PROGRAM}
 
+# To build any of the extras programs, run with:
+# 	make EXTRAS="extras/a extras/b" 
+EXTRAS=
 
 # place to put our device nodes
 udevdir = ${prefix}/udev/
@@ -60,7 +63,7 @@ AR = $(CROSS)ar
 STRIP = $(CROSS)strip
 RANLIB = $(CROSS)ranlib
 
-export CROSS CC AR STRIP RANLIB
+export CROSS CC AR STRIP RANLIB CFLAGS LDFLAGS LIB_OBJS ARCH_LIB_OBJS CRT0
 
 # code taken from uClibc to determine the current arch
 ARCH := ${shell $(CC) -dumpmachine | sed -e s'/-.*//' -e 's/i.86/i386/' -e 's/sparc.*/sparc/' \
@@ -108,20 +111,20 @@ endif
 # If we are using our version of klibc, then we need to build and link it.
 # Otherwise, use glibc and link statically.
 ifeq ($(strip $(KLIBC)),true)
-	KLIBC_DIR	= klibc/klibc
+	KLIBC_BASE	= $(PWD)/klibc
+	KLIBC_DIR	= $(KLIBC_BASE)/klibc
 	INCLUDE_DIR	:= $(KLIBC_DIR)/include
+	LINUX_INCLUDE_DIR	:= $(KLIBC_BASE)/linux/include
 	include $(KLIBC_DIR)/arch/$(ARCH)/MCONFIG
 	# arch specific objects
-	LIBGCC		= $(shell $(CC) --print-libgcc)
 	ARCH_LIB_OBJS =	\
-			$(KLIBC_DIR)/libc.a	\
-			$(LIBGCC)
+			$(KLIBC_DIR)/libc.a
 
 
 	CRT0 = $(KLIBC_DIR)/crt0.o
 	LIBC =	$(ARCH_LIB_OBJS) $(LIB_OBJS) $(CRT0)
 	CFLAGS += -nostdinc -I$(INCLUDE_DIR) -I$(KLIBC_DIR)/arch/$(ARCH)/include \
-		-I$(INCLUDE_DIR)/bits$(BITSIZE) -I$(GCCINCDIR) -Iklibc/linux/include \
+		-I$(INCLUDE_DIR)/bits$(BITSIZE) -I$(GCCINCDIR) -I$(LINUX_INCLUDE_DIR) \
 		-D__KLIBC__
 	LIB_OBJS =
 	LDFLAGS = --static --nostdlib -nostartfiles -nodefaultlibs
@@ -133,7 +136,14 @@ else
 	LDFLAGS = --static 
 endif
 
+CFLAGS += -I$(PWD)/libsysfs
+
 all: $(ROOT)
+	@for target in $(EXTRAS) ; do \
+		echo $$target ; \
+		$(MAKE) prefix=$(prefix) LD="$(LD)" SYSFS="$(SYSFS)" \
+			-C $$target $@ ; \
+	done ; \
 
 $(ROOT): $(LIBC)
 
@@ -145,13 +155,13 @@ $(CRT0):
 TDB =	tdb/tdb.o	\
 	tdb/spinlock.o
 
-SYSFS =	libsysfs/sysfs_bus.o	\
-	libsysfs/sysfs_class.o	\
-	libsysfs/sysfs_device.o	\
-	libsysfs/sysfs_dir.o	\
-	libsysfs/sysfs_driver.o	\
-	libsysfs/sysfs_utils.o	\
-	libsysfs/dlist.o
+SYSFS =	$(PWD)/libsysfs/sysfs_bus.o	\
+	$(PWD)/libsysfs/sysfs_class.o	\
+	$(PWD)/libsysfs/sysfs_device.o	\
+	$(PWD)/libsysfs/sysfs_dir.o	\
+	$(PWD)/libsysfs/sysfs_driver.o	\
+	$(PWD)/libsysfs/sysfs_utils.o	\
+	$(PWD)/libsysfs/dlist.o
 
 OBJS =	udev.o		\
 	udev_config.o	\
@@ -192,6 +202,11 @@ clean:
 	 | xargs rm -f 
 	-rm -f core $(ROOT) $(GEN_HEADERS)
 	$(MAKE) -C klibc clean
+	@for target in $(EXTRAS) ; do \
+		echo $$target ; \
+		$(MAKE) prefix=$(prefix) LD="$(LD)" SYSFS="$(SYSFS)" \
+			-C $$target $@ ; \
+	done ; \
 
 DISTFILES = $(shell find . \( -not -name '.' \) -print | grep -v CVS | grep -v "\.tar\.gz" | grep -v "\/\." | grep -v releases | grep -v BitKeeper | grep -v SCCS | grep -v "\.tdb" | grep -v "test\/sys" | sort )
 DISTDIR := $(RELEASE_NAME)
@@ -236,6 +251,11 @@ install: all
 	$(INSTALL_DATA) udev.permissions $(DESTDIR)$(configdir)
 	- rm -f $(DESTDIR)$(hotplugdir)/udev.hotplug
 	- ln -s $(sbindir)/$(ROOT) $(DESTDIR)$(hotplugdir)/udev.hotplug
+	@for target in $(EXTRAS) ; do \
+		echo $$target ; \
+		$(MAKE) prefix=$(prefix) LD="$(LD)" SYSFS="$(SYSFS)" \
+			-C $$target $@ ; \
+	done ; \
 
 uninstall:
 	- rm $(hotplugdir)/udev.hotplug
@@ -247,5 +267,10 @@ uninstall:
 	- rmdir $(hotplugdir)
 	- rmdir $(configdir)
 	- rmdir $(udevdir)
+	@for target in $(EXTRAS) ; do \
+		echo $$target ; \
+		$(MAKE) prefix=$(prefix) LD="$(LD)" SYSFS="$(SYSFS)" \
+			-C $$target $@ ; \
+	done ; \