[bug #52912] minor bug in GNU make's own Makefile under .ONESHELL

[David Boyce]

Follow-up Comment #4, bug #52912 (project make):

Yes, I understand you weren't suggesting the fake "bash" be on PATH. But I
still think it's an unfortunate hack.

I've been using the build of make itself as a test/demo for a related build
tool I'm working on. I'm under no illusion that the rest of the world is a
friendlier place for .ONESHELL but I did think it would be nice if GNU make
could support its own feature.

How about adding a special variable POSIXSHELL with the same semantics as
SHELL except for (a) taking precedence and (b) declaring it to be POSIX
compatible?

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