[[share build environment]]
Add a [[environment variable]] for a [[target]]. Environment variables for a target are set at the start of that target's run of [[share-do]].
share-addenv:debug: set -x
share-addenv: target=$1
share-addenv: shift
share-addenv: var=$1
share-addenv: shift
share-addenv: envdir=${target}.env
share-addenv: if ! test -d $envdir; then
share-addenv: mkdir -p $envdir
share-addenv: fi
Remove existing dependency (with [[share-rmdep]]) and add it again (with [[share-adddep]]) with checksum 0, since the value may have changed. The checksum needs to be 0 so the target knows it's out-of-date with respect to the new value.
share-addenv: share-rmdep $target "\$$var"
share-addenv: share-adddep $target "\$$var"
Might be better to check the new value against the current value for this target, and only update the checksum to 0 if it has changed. To do this, we need to take the checksum of the new value, and compare it against the currently-recorded checksum for this variable for this target, if there is one. #backlog
share-addenv: echo "$*" >${envdir}/$var
lit 'lit=share-addenv.md' 'file=share-addenv'
lit 'lit=share-addenv.md' 'file=share-addenv' 'variant=debug'
share addenv hello.o CFLAGS ''
share addenv hello.o CFLAGS -O2
share addenv hello.o CFLAGS -O2 -Wall
share addenv hello.o CFLAGS -Wall
share rmdep hello.o
share lsdep
apply {file=$1; cat $file | sed 's,^,'^$file^': ,'} `{ls *.env}
share lsenv