Follow-up Comment #3, bug #27495 (project make):
Because if you change the value of SHELL to a command that make doesn't
recognize as a POSIX sh implementation, it disables the fast path altogether.
There's nothing saying you can't use a completely different program, like Perl
or Python or Ruby or something, as SHELL, in which case all make's parsing,
etc. would be wrong. So, if SHELL is not a known POSIX sh then make never
uses the fast path.
Make does not recognize /bin/dash as a POSIX sh, by default, so if you set
SHELL to /bin/bash it will ALWAYS invoke the shell and never use the fast
path, so you ALWAYS get the builtin echo behavior.
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