building and analysing C structs with Storable
lemming at henning-thielemann.de
Sun Oct 14 16:05:27 EDT 2007
On Sun, 14 Oct 2007, Stefan O'Rear wrote:
> On Sun, Oct 14, 2007 at 09:28:45PM +0200, Henning Thielemann wrote:
>> Do different C compilers on the same platform actually use different
>> layouts for structs?
> Yes, because there are tradeoffs involved. On x86, the optimal
> alignment for long double is 8 bytes, but a lot of people aren't crazy
> about 6 bytes of padding per 10 byte datum, so some compilers default to
> 4 byte alignment.
>> If yes, how can I find out, with which compiler a
>> library was compiled?
> Ask the person who did the compiling.
... but then c2hs cannot do it better (=automatically) than the "compiler
dependent Haskell module" approach, can it?
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