[PATCH] Makefile: fix generation of defaultenv.h from empty initial file

[Tom Rini]

On Thu, Apr 22, 2021 at 09:44:18AM +0200, Rasmus Villemoes wrote:

> When CONFIG_USE_DEFAULT_ENV_FILE=y and the file
> CONFIG_DEFAULT_ENV_FILE is empty (or at least doesn't contain any
> non-comment, non-empty lines), we end up feeding nothing into xxd,
> which in turn then outputs nothing. Then blindly appending ", 0x00"
> means that we end up trying to compile (roughly)
> 
> const char defaultenv[] = { , 0x00 }
> 
> which is of course broken.
> 
> To fix that, change the frobbing of the text file so that we always
> end up printing an extra empty line (which gets turned into that extra
> nul byte we need) - that corresponds better to the binary format
> consisting of a series of key=val nul terminated strings, terminated
> by an empty string.
> 
> Reported-by: Oleksandr Suvorov <oleksandr.suvorov at toradex.com>
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
> Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov at toradex.com>

Applied to u-boot/master, thanks!

-- 
Tom
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