[Haskell-cafe] MD5 performance optimizations, and GHC -via-C producing segfaulting binary

Salvatore Insalaco kirby81 at gmail.com
Tue May 20 16:12:08 EDT 2008

2008/5/20 Don Stewart <dons at galois.com>:
>> Probably compiling with -fvia-C could help even more, but strangely:
>> [roxas:~/Desktop/test2/MyMD5] kirby% ghc -fvia-C -funbox-strict-fields
>> -O2 --make md5sum.hs
>> [roxas:~/Desktop/test2/MyMD5] kirby% time ./md5sum ../../jboss-4.2.2.GA.zip
>> Segmentation fault
>> Is this supposed to happen? There're no "unsafe" functions or imports
>> used in the program. Maybe a bug in GHC?
> That could be a gcc bug, in fact. Can you provide the final source?
> Does changing the gcc optimisation level help? (i.e. -fvia-C -optc-O2 )

I tried with and without gcc optimizations, but it always segfaults.
It happened to me even before my optimizations.

I've got GHC 6.8.2 on Mac OS X 10.5.2, GCC 4.0.1. -fvia-C works well
for other libraries and applications, so I don't think it's a problem
of my specific setting.

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