version:
$ make -v
GNU Make version 3.77, by Richard Stallman and Roland McGrath.
os:
Red Hat 6.1, i686. (Make was built/configured by Redhat, not me)
the info file states: (Node: Flavors, and numerous others)
at the end of the page, it says:
--------------------------------------------------
FOO ?= bar
is exactly equivalent to this (*note The `origin' Function: Origin
Function.):
ifeq ($(origin FOO), undefined)
FOO = bar
endif
--------------------------------------------------
This is *WRONG* or there's a bug, or I am not reading this
correctly. This example make file shows the problem.
BAR =/foo/bar
BAR2 =/foo/bar2
# This does not work.
FOO ?= ${BAR}
# This does.
ifeq ($(origin FOO2), undefined)
FOO2 = ${BAR2}
endif
doit:
@echo "FOO is: ${FOO}"
@echo "FOO2 is: ${FOO2}"
--------------------------------------------------
I get this:
FOO is:
FOO2 is: /foo/bar2
I expected to get this:
FOO is: /foo/bar
FOO2 is: /foo/bar/2
I have tried various := type assignments, and they don't
work either.
Thanks,
-Duane.
