Support parallel build trees (VPATH builds)

Build products from an out of tree build should be written
relative to the build directory.  Sources should be referred
to by their locations in the source directory.

This is accomplished by adding the 'src' and 'obj' variables
for the module Makefile.am, using relative paths to reference
source files, and by setting VPATH when source files are not
co-located with the Makefile.  This enables the following:

  $ mkdir build
  $ cd build
  $ ../configure
  $ make -s

This change also has the advantage of resolving the following
warning which is generated by modern versions of automake.

  Makefile.am:00: warning: source file 'xxx' is in a subdirectory,
  Makefile.am:00: but option 'subdir-objects' is disabled

Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue zfsonlinux/zfs#1082

Makefile.am

@@ -1,9 +1,9 @@
 
 ACLOCAL_AMFLAGS = -I config
 
-include $(top_srcdir)/config/rpm.am
+include config/rpm.am
-include $(top_srcdir)/config/deb.am
+include config/deb.am
-include $(top_srcdir)/config/tgz.am
+include config/tgz.am
 
 SUBDIRS = include rpm
 if CONFIG_USER
@@ -40,11 +40,11 @@ dist-hook:
 		$(distdir)/META
 
 ctags:
-	$(RM) $(top_srcdir)/tags
+	$(RM) tags
 	find $(top_srcdir) -name .git -prune -o -name '*.[hc]' | xargs ctags
 
 etags:
-	$(RM) $(top_srcdir)/TAGS
+	$(RM) TAGS
 	find $(top_srcdir) -name .pc -prune -o -name '*.[hc]' | xargs etags -a
 
 tags: ctags etags

config/rpm.am

@@ -51,7 +51,7 @@ rpm-local:
 	mkdir -p $(rpmbuild)/SPECS && \
 	cp ${RPM_SPEC_DIR}/$(rpmspec) $(rpmbuild)/SPECS && \
 	mkdir -p $(rpmbuild)/SOURCES && \
-	cp scripts/kmodtool $(rpmbuild)/SOURCES && \
+	cp $(top_srcdir)/scripts/kmodtool $(rpmbuild)/SOURCES && \
 	cp $(distdir).tar.gz $(rpmbuild)/SOURCES)
 
 srpm-common: dist

include/util/Makefile.am

@@ -2,7 +2,7 @@ COMMON_H =
 
 KERNEL_H = \
 	$(top_srcdir)/include/util/qsort.h \
-        $(top_srcdir)/include/util/sscanf.h
+	$(top_srcdir)/include/util/sscanf.h
 
 USER_H =
 

module/spl/Makefile.in

@@ -1,27 +1,30 @@
 # Makefile.in for spl kernel module
 
+src = @abs_top_srcdir@/module/spl
+obj = @abs_builddir@
+
 MODULE := spl
 EXTRA_CFLAGS = $(SPL_MODULE_CFLAGS) @KERNELCPPFLAGS@
 
 # Solaris porting layer module
 obj-$(CONFIG_SPL) := $(MODULE).o
 
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-proc.o
+$(MODULE)-objs += spl-proc.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-kmem.o
+$(MODULE)-objs += spl-kmem.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-kmem-cache.o
+$(MODULE)-objs += spl-kmem-cache.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-vmem.o
+$(MODULE)-objs += spl-vmem.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-thread.o
+$(MODULE)-objs += spl-thread.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-taskq.o
+$(MODULE)-objs += spl-taskq.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-rwlock.o
+$(MODULE)-objs += spl-rwlock.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-vnode.o
+$(MODULE)-objs += spl-vnode.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-err.o
+$(MODULE)-objs += spl-err.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-kobj.o
+$(MODULE)-objs += spl-kobj.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-generic.o
+$(MODULE)-objs += spl-generic.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-atomic.o
+$(MODULE)-objs += spl-atomic.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-mutex.o
+$(MODULE)-objs += spl-mutex.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-kstat.o
+$(MODULE)-objs += spl-kstat.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-condvar.o
+$(MODULE)-objs += spl-condvar.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-xdr.o
+$(MODULE)-objs += spl-xdr.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-cred.o
+$(MODULE)-objs += spl-cred.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-tsd.o
+$(MODULE)-objs += spl-tsd.o
-$(MODULE)-objs += @top_srcdir@/module/spl/spl-zlib.o
+$(MODULE)-objs += spl-zlib.o

module/splat/Makefile.in

@@ -1,25 +1,28 @@
 # Makefile.in for splat kernel module
 
+src = @abs_top_srcdir@/module/splat
+obj = @abs_builddir@
+
 MODULE := splat
 EXTRA_CFLAGS = $(SPL_MODULE_CFLAGS) @KERNELCPPFLAGS@
 
 # Solaris Porting LAyer Tests
 obj-$(CONFIG_SPL) := $(MODULE).o
 
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-ctl.o
+$(MODULE)-objs += splat-ctl.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-kmem.o
+$(MODULE)-objs += splat-kmem.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-taskq.o
+$(MODULE)-objs += splat-taskq.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-random.o
+$(MODULE)-objs += splat-random.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-mutex.o
+$(MODULE)-objs += splat-mutex.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-condvar.o
+$(MODULE)-objs += splat-condvar.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-thread.o
+$(MODULE)-objs += splat-thread.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-rwlock.o
+$(MODULE)-objs += splat-rwlock.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-time.o
+$(MODULE)-objs += splat-time.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-vnode.o
+$(MODULE)-objs += splat-vnode.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-kobj.o
+$(MODULE)-objs += splat-kobj.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-atomic.o
+$(MODULE)-objs += splat-atomic.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-list.o
+$(MODULE)-objs += splat-list.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-generic.o
+$(MODULE)-objs += splat-generic.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-cred.o
+$(MODULE)-objs += splat-cred.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-zlib.o
+$(MODULE)-objs += splat-zlib.o
-$(MODULE)-objs += @top_srcdir@/module/splat/splat-linux.o
+$(MODULE)-objs += splat-linux.o

scripts/Makefile.am

@@ -1,4 +1,4 @@
 EXTRA_DIST = check.sh dkms.mkconf dkms.postbuild kmodtool
 
 check:
-	$(top_srcdir)/scripts/check.sh
+	scripts/check.sh