um: Fix for relative objtree when generating x86 headers

In an O= build, rely on the generated Makefile to call the main Makefile
properly. When building in the source tree, we do not need to specify
the -C and O= either. This fixes the problem when $(objtree) is a
relative path and the -C changes the directory.

Reported-by: Richard Weinberger <richard.weinberger@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

diff --git a/arch/um/Makefile b/arch/um/Makefile
index 36e658a..e4b1a96 100644 (file)
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -111,8 +111,7 @@ endef
 KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
 
 archheaders:
-       $(Q)$(MAKE) -C '$(srctree)' KBUILD_SRC= \
-               ARCH=$(HEADER_ARCH) O='$(objtree)' archheaders
+       $(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
 
 archprepare: include/generated/user_constants.h