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question about $$+

From: ali hagigat
Subject: question about $$+
Date: Tue, 31 Aug 2010 11:28:42 +0430

Secondary Expansion of Explicit Rules
foo: foo.1 bar.1 $$< $$^ $$+   # line #1
foo: foo.2 bar.2 $$< $$^ $$+   # line #2
foo: foo.3 bar.3 $$< $$^ $$+   # line #3
In the first prerequisite list, all three variables ($$<, $$^, and $$+)
expand to the empty
string. In the second, they will have values foo.1, foo.1 bar.1, and
foo.1 bar.1 respec-
tively. In the third they will have values foo.1, foo.1 bar.1 foo.2
bar.2, and foo.1
bar.1 foo.2 bar.2 respectively.
In page 21 of the make manual, there is an example of secondary
expansion. The written result of the third $$+ seems wrong. It should
foo.1 bar.1 foo.2 bar.2 foo.1 foo.1 bar.1 foo.1 bar.1
Please correct me if I am wrong. Thank you.

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