David Boyce observed:
> I was unpleasantly surprised to learn while following this discussion
> that "Except by explicit request, make exports a variable only if it
> is either defined in the environment initially _or set on the command
> line_".
... and I was surprised to find (by experiment with
<file name="Makefile">
default:
/usr/bin/env
</file> invoked via make WURGLE=8, finding this indeed reported by env)
that this really does mean export *to the environment*, where I had
supposed it was exported only to subordinate make invocations (by virtue
of being part of MAKEFLAGS).
This does seem like an unsound choice, for the reasons David gave,
Eddy.
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