I was trying to use a gmake feature I had not tried before, the ?=
assignment operator. The following is a small makefile I constructed to
demonstrate my problem. Based on my reading of
http://www.gnu.org/manual/make-3.77/html_mono/make.html, the ?= assignment
below should assign "DFLT DFLT DFLT" to MY_FLAGS since it is empty.
MY_FLAGS_DFLT := DLFT DFLT DFLT
MY_FLAGS ?= ${MY_FLAGS_DFLT}
all::
@ echo "MY_FLAGS: ${MY_FLAGS}"
When I run:
gmake -f tst all
I get:
MY_FLAGS:
Not what I expected.
What don't I understand?????
Thanks in advance
Rick Phillips
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