[bug #51286] Support for additional local make variables

[Jouke Witteveen]

Follow-up Comment #1, bug #51286 (project make):

If the value you are trying to assign to a variable is guaranteed to contain
no spaces, you could use
  $(foreach var,<val>,<...>)
but that is a bit of a hack of course.

More complete lexical scoping was proposed on the mailing list
(https://lists.gnu.org/archive/html/bug-make/2019-12/msg00017.html) in the
form of let expressions
  $(let <var>,<val>,<...>)
but Paul Smith expressed his concern that let expressions may be to foreign to
the audience of make and that they do not fit the overall design of make
nicely.

I have attached the working prototype for implementing let expressions, which
lack documentation. Essentially, each word of <val> is assigned to each
variable name in <var>, where the last variable name gets all remaining words
in <val>. If there are more words in <var> than in <val>, the corresponding
variables will be empty.

(file #48701)
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Additional Item Attachment:

File name: let-function.patch             Size:2 KB
    <https://savannah.gnu.org/file/let-function.patch?file_id=48701>



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