btrfs-progs: build, use autoconf to detect RM

Signed-off-by: David Sterba <dsterba@suse.cz>

Makefile.in

@@ -4,6 +4,8 @@ export
 CC = @CC@
 LN_S = @LN_S@
 AR = @AR@
+RM = @RM@
+RMDIR = @RMDIR@
 INSTALL = @INSTALL@
 DISABLE_DOCUMENTATION = @DISABLE_DOCUMENTATION@
 
@@ -282,7 +284,7 @@ clean-all: clean clean-doc clean-gen
 
 clean: $(CLEANDIRS)
 	@echo "Cleaning"
-	$(Q)rm -f $(progs) cscope.out *.o *.o.d \
+	$(Q)$(RM) -f $(progs) cscope.out *.o *.o.d \
 	      dir-test ioctl-test quick-test send-test library-test library-test-static \
 	      btrfs.static mkfs.btrfs.static \
 	      $(check_defs) \
@@ -295,7 +297,7 @@ clean-doc:
 
 clean-gen:
 	@echo "Cleaning Generated Files"
-	$(Q)rm -rf version.h config.status config.cache connfig.log \
+	$(Q)$(RM) -rf version.h config.status config.cache connfig.log \
 		configure.lineno config.status.lineno Makefile \
 		config.log config.h config.h.in~ aclocal.m4 \
 		configure autom4te.cache/ config/
@@ -327,10 +329,10 @@ $(INSTALLDIRS):
 
 uninstall:
 	$(Q)$(MAKE) $(MAKEOPTS) -C Documentation uninstall
-	cd $(DESTDIR)$(incdir); rm -f $(headers)
-	rmdir -p --ignore-fail-on-non-empty $(DESTDIR)$(incdir)
-	cd $(DESTDIR)$(libdir); rm -f $(lib_links) $(libs)
-	cd $(DESTDIR)$(bindir); rm -f btrfsck fsck.btrfs $(progs)
+	cd $(DESTDIR)$(incdir); $(RM) -f $(headers)
+	$(RMDIR) -p --ignore-fail-on-non-empty $(DESTDIR)$(incdir)
+	cd $(DESTDIR)$(libdir); $(RM) -f $(lib_links) $(libs)
+	cd $(DESTDIR)$(bindir); $(RM) -f btrfsck fsck.btrfs $(progs)
 
 ifneq ($(MAKECMDGOALS),clean)
 -include $(objects:.o=.o.d) $(cmd-objects:.o=.o.d) $(subst .btrfs,, $(filter-out btrfsck.o.d, $(progs:=.o.d)))

configure.ac

@@ -31,6 +31,8 @@ AC_SYS_LARGEFILE
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PATH_PROG([AR], [ar])
+AC_PATH_PROG([RM], [rm], [rm])
+AC_PATH_PROG([RMDIR], [rmdir], [rmdir])
 
 AC_CHECK_FUNCS([openat], [],
 	[AC_MSG_ERROR([cannot find openat() function])])