[PATCH v2] Makefile: fix generating environment file

[Rasmus Villemoes]

On 20/04/2021 16.43, Oleksandr Suvorov wrote:
> If the CONFIG_USE_DEFAULT_ENV_FILE=y and CONFIG_DEFAULT_ENV_FILE
> points to the empty environment file, the auto-generated file has
> the wrong syntax so it leads to the compilation failure:
>

Glad someone is using CONFIG_USE_DEFAULT_ENV_FILE :) And thanks for
reporting this.

> 
> Fix this issue conditionally adding the delimiter ", ".

Hm, yeah, that should work. But I wonder if it would make more sense to
ensure tr always gets a final newline (which then gets translated to a
nul byte, which in turn gives the trailing 0x00). Something like (untested)

define filechk_defaultenv.h
        ( { grep -v '^#' | grep -v '^$$' ; echo '' ; } | \
         tr '\n' '\0' | \
         sed -e 's/\\\x0\s*//g' | \
         xxd -i ; )
endef

Rasmus