Make with nothing to do

gistfile1.txt

# make with nothing to do still runs ghc 364 times.
# also, ghc 8 seems to take twice as long to do nothing than 7.10

amos@Amos ddc $ g
The Glorious Glasgow Haskell Compilation System, version 7.10.2
amos@Amos ddc $ time make
make[2]: Nothing to be done for `deps'.
make[2]: `bin/ddc-check' is up to date.

real	0m10.593s
user	0m6.430s
sys	0m4.672s


amos@Amos ddc $ g
The Glorious Glasgow Haskell Compilation System, version 8.0.1
amos@Amos ddc $ time make
make[2]: Nothing to be done for `deps'.
make[2]: `bin/ddc-check' is up to date.

real	0m22.374s
user	0m11.835s
sys	0m10.338s


(with no ghc, spits out 364 errors)
amos@Amos ddc $ time PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin make 2>/dev/null
make[2]: Nothing to be done for `deps'.
make[2]: `bin/ddc-check' is up to date.

real	0m2.739s
user	0m1.718s
sys	0m1.381s