kbuild: external module build warnings when KBUILD_OUTPUT set and W=1

Commit db547ef19064 ("Kbuild: don't add obj tree in additional includes")
causes warnings (-Wmissing-include-dirs) when compiling external modules
with KBUILD_OUTPUT set and W=1.  This is because $src can be an absolute
path to the external module source which when prefixed with -I$(srctree)/
generates an incorrect directory path.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 0a07f9014944ed92a8e2e42983ae43be60b3e471..7234e61e7ce370a775ec6981b391b6d102a01770 100644 (file)
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -155,7 +155,7 @@ else
 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 #   and locates generated .h files
 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
-__c_flags      = $(if $(obj),-I$(srctree)/$(src) -I$(obj)) \
+__c_flags      = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
                  $(call flags,_c_flags)
 __a_flags      = $(call flags,_a_flags)
 __cpp_flags     = $(call flags,_cpp_flags)