[bug #59154] Multiline environment variables handled poorly

[Kyle Rose]

Follow-up Comment #6, bug #59154 (project make):

[comment #5 comment #5:]
> (To be precise, the line
>        echo "${BLAH}"
> works in all the shells I've tested, and in BSD Make, but not GNU Make.  If
BSD Make can get this right, seems like gnu make should be able to, too.)

This could break a ton of software that relies on multiple lines in an
environment variable becoming multiple commands in a recipe. If you want this
behavior, it should be selectable on a target-by-target basis with a
.MULTILINECMD dependency or some other mechanism.

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