Fix Makefile.xen generation when building external modules

Otherwise, the file will be (attempted to be) put in the (possibly
read-only) source tree.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 218199b54d80164ccc2386fc82b57dc0077fe313..6473fd2ab89925cd6a856241f3a2e91819bfa552 100644 (file)
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -69,7 +69,8 @@ $(warning kbuild: Makefile.build is included improperly)
 endif
 
 ifeq ($(CONFIG_XEN),y)
-$(objtree)/scripts/Makefile.xen: $(srctree)/scripts/Makefile.xen.awk $(srctree)/scripts/Makefile.build
+Makefile.xen := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD),$(objtree)/scripts)/Makefile.xen
+$(Makefile.xen): $(srctree)/scripts/Makefile.xen.awk $(srctree)/scripts/Makefile.build
        @echo '  Updating $@'
        $(if $(shell echo a | $(AWK) '{ print gensub(/a/, "AA", "g"); }'),\
         ,$(error 'Your awk program does not define gensub.  Use gawk or another awk with gensub'))
@@ -79,7 +80,7 @@ xen-src-single-used-m := $(patsubst $(srctree)/%,%,$(wildcard $(addprefix $(srct
 xen-single-used-m      := $(xen-src-single-used-m:-xen.c=.o)
 single-used-m          := $(filter-out $(xen-single-used-m),$(single-used-m))
 
--include $(objtree)/scripts/Makefile.xen
+-include $(Makefile.xen)
 endif
 
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