How to synthesize line breaks in GNU Make warnings or errors?

Question

When using the built-in $(error text) and $(warning text) functions of GNU Make, how can I get line breaks into the error/warning output without acrobatics?

By acrob

Answer 1

Define a line break variable using define/endef and use it as $n like this:

define n


endef

$(warning "something$nfoo$nbar$nbaz")

Note the two blank lines between define and endef