At the moment HaRe has -O0 set for the library.
Here are some timing differences on my machine with optimisation on and off
With normal optimisation, we get
$ rm -fr dist-newstyle/
$ cabal new-configure --enable-test
$ time cabal new-build
real 6m54.778s
user 7m3.156s
sys 0m4.504s
With -O0, the timing for the same commands is
real 0m36.427s
user 0m41.448s
sys 0m2.544s
So optimisation slows it down from 36 seconds to 7 minutes.
Alan
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