eval and export behave differently together in dash and ash than in bash, zsh, and ksh

[Dan Kegel <dank@xxxxxxxxx>]

The script

eval export dir=~$LOGNAME
echo $dir

eval dir2=~$LOGNAME
echo $dir2

produces different results on different shells.

bash  (4.2-2ubuntu2.1) (with and without --posix)
zsh (4.3.17-1ubuntu1)
ksh (93u-1)
produce

/home/buildbot
/home/buildbot

dash (0.5.7-2ubuntu2)
ash (0.5.7-2ubuntu2)
produce

~buildbot
/home/buildbot

The easy workaround is to use the older form

eval dir=~$LOGNAME
export dir

but it'd be nice if that weren't needed.
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