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| # http://www.gnu.org/software/make/manual/make.html#Syntax-of-Functions
| ,:= ,
| empty:=
| space:= $(empty) $(empty)
| foo:= a b c
| bar:= $(subst $(space),$,,$(foo))
| # bar is now `,abc'
| # space in `,$(foo)' replaced with `$', which will be empty
|
| test:
| echo $(bar)
|
|
