# Here are two testcases. The first works as expected:
$cat GNUmakefile
some_target: prerequisite
flags := INAPPROPRIATE for prerequisite
prerequisite: flags := appropriate for prerequisite
all_flags = $(flags)
prerequisite:
@echo " flags are" $(flags)
@echo " all_flags are" $(all_flags)
$make
flags are appropriate for prerequisite
all_flags are appropriate for prerequisite
# Here is the second testcase. It's identical to the first testcase,
# except for the additional '+=' line at the top:
$cat GNUmakefile
some_target: all_flags += ...some other flags...
some_target: prerequisite
flags := INAPPROPRIATE for prerequisite
prerequisite: flags := appropriate for prerequisite
all_flags = $(flags)
prerequisite:
@echo " flags are" $(flags)
@echo " all_flags are" $(all_flags)
$make
flags are appropriate for prerequisite
all_flags are INAPPROPRIATE for prerequisite ...some other flags...
# I was surprised by this second testcase. I had expected
# all_flags are appropriate for prerequisite ...some other flags...
# because $(all_flags) is a recursively-expanded variable. Is the
# observed behavior correct? (I'm using GNU Make version 3.79.1 .)
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