I am trying to assign the result of a command to a variable in GNU make. It works if I do it outside the rule:
$ cat stack.mk
GIT_BRANCH=$(shell git rev-parse --abbrev-ref HEAD)
all:
@echo Git branch is $(GIT_BRANCH)
$ make -f stack.mk all
Git branch is dev
But not if I put it in the rule body:
$ cat stack.mk
all:
export GIT_BRANCH=$(shell git rev-parse --abbrev-ref HEAD)
@echo Git branch is $(GIT_BRANCH)
$ make -f stack.mk all
export GIT_BRANCH=dev
Git branch is
Is it possible to assign variables in a rule. At this point I would like to assign the results of a couple of git commands to shell/Makefile variables.
Yes, if you are trying to set a Makefile variable, you can do it using eval function.
all:
$(eval GIT_BRANCH=$(shell git rev-parse --abbrev-ref HEAD))
echo Git branch is $(GIT_BRANCH)
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