On Thu, 2018-12-06 at 05:10:28 UTC, Michael Ellerman wrote:
> In commit 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols to
> wrapper") we added a dependency to serial.c on autoconf.h:
>
> $(obj)/serial.c: $(obj)/autoconf.h
>
> This works when building in-tree (ie. with KBUILD_OUTPUT unset)
> because the obj tree is the src tree.
>
> But when building with eg. O=build and -j 1 the build fails:
>
> gcc ... -I../arch/powerpc/boot -c -o arch/powerpc/boot/serial.o
> arch/powerpc/boot/serial.c
> gcc: error: arch/powerpc/boot/serial.c: No such file or directory
>
> Why this is only happening with -j 1 is not clear, when building with
> -j greater than 1 somehow we decide to look for serial.c in the src
> tree (../), eg:
>
> gcc -I../arch/powerpc/boot -c -o arch/powerpc/boot/serial.o
> ../arch/powerpc/boot/serial.c
>
> Regardless we shouldn't be specifying a dependency on serial.c in the
> build tree, we want to add a dependency to the version in $(srctree)
> so fix the rule to say that.
>
> Fixes: 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols to wrapper")
> Tested-by: Daniel Axtens <d...@axtens.net>
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
Applied to powerpc fixes.
https://git.kernel.org/powerpc/c/e41b93a6be57e26a4a123345f826a6
cheers
