Hi Junio,
On Thu, 9 Oct 2014, Junio C Hamano wrote:
> Isn't the primary reason we use colon-assign to avoid running the same
> $(shell) over and over again every time $(uname_?) gets referenced? How
> would it work with ?= ???
I was under the impression that ?= would only define the variable once,
the next time ?= would be encountered, no assignment (and actually, no
evaluation) would take place because the variable already has a value?
According to
https://www.gnu.org/software/make/manual/make.html#index-_003f_003d
FOO ?= bar
is exactly equivalent to this (see The origin Function):
ifeq ($(origin FOO), undefined)
FOO = bar
endif
> Pardon misspellings and grammos, typed on a tablet.
No worries. But you really should use your tablet for reading books after
midnight instead of doing work... ;-)
Ciao,
Dscho
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