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Subject[PATCH 1/1] kbuild: use $(srctree) to locate config headers from external modules
Date
When making modules_install for an out-of-tree module, the current
directory is $(KBUILD_OUTPUT), and the Makefile recipe which verifies
the existence of files in include/config is unable to find them using a
relative path. This leads to a spurious and puzzling "Kernel
configuration is invalid" warning when no configuration is actually
needed.

Since the file check is done in a recipe with `test -e' rather than as a
target or include, the usual search paths provided by VPATH and -I are
not consulted, so an explicit path is needed in this case.

Signed-off-by: Devin J. Pohly <djpohly+linux@gmail.com>
---
Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f6a7794..60c14a2 100644
--- a/Makefile
+++ b/Makefile
@@ -590,7 +590,7 @@ else
PHONY += include/config/auto.conf

include/config/auto.conf:
- $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
+ $(Q)test -e $(srctree)/include/generated/autoconf.h -a -e $(srctree)/$@ || ( \
echo >&2; \
echo >&2 " ERROR: Kernel configuration is invalid."; \
echo >&2 " include/generated/autoconf.h or $@ are missing.";\
--
2.0.3


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