On 23/06/2010 01:56, Builder wrote:
ld: warning codegen in _stg_ap_pppppp_fast (offset 0x000000A4) prevents image
from loading in dyld shared cache
ld: warning codegen in _stg_ap_pppppp_fast (offset 0x000000C3) prevents image
from loading in dyld shared cache
ld: warning codegen in _stg_ap_pppppp_fast (offset 0x000000EA) prevents image
from loading in dyld shared cache
ld: warning codegen in _stg_ap_pppppp_fast (offset 0x00000117) prevents image
from loading in dyld shared cache
ld: warning codegen in _stg_ap_pppppp_fast (offset 0x00000147) prevents image
from loading in dyld shared cache
ld: warning codegen in _stg_ap_pppppp_fast (offset 0x00000163) prevents image
from loading in dyld shared cache
ld: absolute addressing (perhaps -mdynamic-no-pic) used in _stg_ap_0_fast from
rts/dist/build/Apply.dyn_o not allowed in slidable image
collect2: ld returned 1 exit status
make[1]: *** [rts/dist/build/libHSrts-ghc6.13.20100623.dylib] Error 1
make: *** [all] Error 2
This is OS X, right? Was this build working before? I think this
failure might be due to a change I made recently:
Thu Jun 17 07:00:25 PDT 2010 Simon Marlow <[email protected]>
* disable -fPIC for the GC for performance reasons
see comment for details
M ./rts/ghc.mk +28
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100617140025-12142-113c10c855704bfbd753cfbc4def3efa7a3888c9.gz
The problem I encountered was that the GC is much slower (50%) on x86
with -fPIC, due to the extra register pressure. On x86/Linux it works
to just omit -fPIC, and let the GC be linked dynamically at load-time.
I also did the same trick for some of the other performance-critical
pieces in the RTS, like Updates.cmm and Apply.cmm (where the above
symbols are defined).
Perhaps omitting -fPIC doesn't work on OS X? If not, we have a slight
problem... the performance hit due to -fPIC on x86 is much too high to
use it by default.
Cheers,
Simon
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