Re: linux-next: build warning after merge of the mm tree

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

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On Wed, Mar 13, 2024 at 03:07:28PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the mm tree, today's linux-next build (powerpc allyesconfig)
> produced this warning:
> 
> Use of uninitialized value $ENV{"abs_srctree"} in concatenation (.) or string at /home/sfr/next/next/lib/build_OID_registry line 38.
> 
> Introduced by commit
> 
>   325f7b0aaea6 ("lib/build_OID_registry: Don't mention the full path of the script in output")
> 
> from the mm-nonmm-unstable branch of the mm tree.

Actually the warning doesn't happen on 325f7b0aaea6. The commit is only
problematic in combination with commit

	e2bad142bb3d ("kbuild: unexport abs_srctree and abs_objtree")

. This commit suggests to use $(abspath ) or $(realpath ) instead, but I
fail to apply this suggestion here.

Obviously

diff --git a/Makefile b/Makefile
index 5e09b53b4850..f73a73a125e0 100644
--- a/Makefile
+++ b/Makefile
@@ -39,7 +39,7 @@ __all:
 # prepare rule.
 
 this-makefile := $(lastword $(MAKEFILE_LIST))
-abs_srctree := $(realpath $(dir $(this-makefile)))
+export abs_srctree := $(realpath $(dir $(this-makefile)))
 abs_objtree := $(CURDIR)
 
 ifneq ($(sub_make_done),1)

would help.

Any ideas how to properly handle that? Would the export be ok?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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