2010/2/25 Simon de Graaf <[email protected]>:
> Hello,
>
> I am working under opensuse and cross compiling for 64 bits Windows.
> I cannot compile the gmp library because mp_limb_t is 32 bits, because of
> the 32 bit long type. I have tried to use the -m64 option but it does
> not work.
the variant provide in our source packages if for building of gcc only
(along with mpfrr and mpc). We use in-tree build here.
> Why can a long integer not be set to 64 bits?
> I have used the binary package from source froge.
> Must i maybe download the source package and compile to cross-compiler
> myself
> to get this behaviour?
Well, the size of type 'long' we can change here. It is part of MS
decission of ABI. For native win32 world, the type 'long' is 32-bit
wide. Therefore for 64-bit Windows, you have to use 'long long' type
to have the scalar width of a pointer. But in general it is better to
use intptr_t/uintptr_t types for any platform you are programming for,
as those types abstract this issue in a standarized way.
Regards,
Kai
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