Thorkil Naur wrote:
Hello,
In the current HEAD, mk/build.mk.sample has:
# -------- 1. A Performance/Distribution
build--------------------------------
ifeq "$(BuildFlavour)" "perf"
SRC_HC_OPTS = -H32m -O2
GhcHcOpts = -Rghc-timing
GhcLibHcOpts =
GhcLibWays = p
endif
If this is used (by copying mk/build.mk.sample to mk/build.mk and uncommenting
the
#BuildFlavour = perf
with no other changes), I understand things so that the GhcLibHcOpts will end
up empty. The default GhcLibHcOpts from mk/config.mk[.in] is:
GhcLibHcOpts=-O -Rghc-timing -fgenerics
Since the default optimization option () is -O0, this is the optimization
level used for the libraries in such a build.
It seems that "GhcLibHcOpts =" is hardly ever the desired choice for a
performance/distribution build. And, in fact,
http://hackage.haskell.org/trac/ghc/wiki/Building/Hacking has:
Full optimisation
To turn up everything to the max, for running performance tests for example,
try these:
SRC_HC_OPTS = -H64m -O2
GhcLibHcOpts = -O2
SplitObjs = YES
Comments would be most welcome.
SRC_HC_OPTS is overriden by GhcLibHcOpts, so in fact the setting for
GhcLibHcOpts above is superfluous. I'll change it to match the one in
build.mk.sample.
Cheers,
Simon
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