Fwd: how to use a string in a .SHELLFLAGS option?

[Britton Kerin]

On Mon, Jan 10, 2022 at 8:29 AM Cook, Malcolm <MEC@stowers.org> wrote:
>
> >I'd like to use:
> >
> >SHELL = /usr/bin/perl
> >.SHELLFLAGS = -w -E 'use warnings FATAL => "all";' -E
> >
> >but it doesn't work, saying at recipe execution time:
> >
> >Can't find string terminator "'" anywhere before EOF at -e line 1.
>
> Your problem is in the recipe that you don't show.
>
> This works perfectly in my hands
>
>         SHELL = /usr/bin/perl
>         .SHELLFLAGS = -w -E 'use warnings FATAL => "all";' -E
>         all:
>                 print 'it works'

It turns out it's a .ONESHELL interaction.  Add .ONESHELL: to the top
of your demo and you get the error.  I don't know why.

Britton