linux-kernel - [PATCH 1/1] kbuild: use $(srctree) to locate config headers from external modules

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Message-Id: <1406922443-22770-1-git-send-email-djpohly+linux@gmail.com>
Date:	Fri,  1 Aug 2014 15:47:23 -0400
From:	"Devin J. Pohly" <djpohly@...il.com>
To:	Michal Marek <mmarek@...e.cz>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Devin J. Pohly" <djpohly+linux@...il.com>
Subject: [PATCH 1/1] kbuild: use $(srctree) to locate config headers from external modules

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@...il.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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