| # 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) |