[U-Boot] [U-Boot, 1/2] kbuild: add .DELETE_ON_ERROR special target

[Tom Rini]

On Fri, Jan 11, 2019 at 07:42:26PM +0900, Masahiro Yamada wrote:

> Linux commit 9c2af1c7377a8a6ef86e5cabf80978f3dbbb25c0
> 
> If Make gets a fatal signal while a shell is executing, it may delete
> the target file that the recipe was supposed to update.  This is needed
> to make sure that it is remade from scratch when Make is next run; if
> Make is interrupted after the recipe has begun to write the target file,
> it results in an incomplete file whose time stamp is newer than that
> of the prerequisites files.  Make automatically deletes the incomplete
> file on interrupt unless the target is marked .PRECIOUS.
> 
> The situation is just the same as when the shell fails for some reasons.
> Usually when a recipe line fails, if it has changed the target file at
> all, the file is corrupted, or at least it is not completely updated.
> Yet the file’s time stamp says that it is now up to date, so the next
> time Make runs, it will not try to update that file.
> 
> However, Make does not cater to delete the incomplete target file in
> this case.  We need to add .DELETE_ON_ERROR somewhere in the Makefile
> to request it.
> 
> scripts/Kbuild.include seems a suitable place to add it because it is
> included from almost all sub-makes.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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