Re: [RFC PATCH v3 01/15] Makefile: use common template for GIT-BUILD-OPTIONS

> Introduce a new "GIT-BUILD-OPTIONS.in" template to address this issue.
> This has multiple advantages:
> [...]
>   - Some build systems complain when not all variables could be
>     substituted, alerting us of mismatches. Others don't, but if we
>     forgot to substitute such variables we now have a bogus string that
>     will likely cause our tests to fail, if they have any meaning in the
>     first place.

> +       @sed \
> +               -e "s|@SHELL_PATH@|\'$(SHELL_PATH_SQ)\'|" \
> +               -e "s|@TEST_SHELL_PATH@|\'$(TEST_SHELL_PATH_SQ)\'|" \
> +               [...]
> +               GIT-BUILD-OPTIONS.in >$@+
>         @if cmp $@+ $@ >/dev/null 2>&1; then $(RM) $@+; else mv $@+ $@; fi
>         @if test -f GIT-BUILD-DIR; then rm GIT-BUILD-DIR; fi