[racket] Detecting 32/64-bit racket

2011/10/29 Thomas Chust <chust at web.de>:
> 2011/10/29 Norman Gray <norman at astro.gla.ac.uk>:
>> [...]
>> Is there a recommended way to detect whether racket is a 32- or
>> 64-bit executable?
>> [...]
>
> Hello Norman,
>
> while I don't know whether this strategy is particularly
> recommendable, I would suggest to use utilities from the FFI module:
>
>  (require (only-in ffi/unsafe compiler-sizeof))
>
>  (compiler-sizeof 'long) ; => 8 on a 64-bit system
>                          ; => 4 on a 32-bit system
>

That doesn't work in all cases, sizeof(long) is 4 on 64-bit Windows.

Niklas

>> [...]
>> I'm writing a racket extension to wrap a C library
>> <http://purl.org/nxg/dist/racket-librdf>, and in the configure.ac, I
>> want to be able to detect whether racket is a 32- or 64-bit
>> executable, so I know whether to (adjust CFLAGS to) check for a
>> suitably-compiled version of the library being wrapped -- a 32-bit
>> racket needs a 32-bit underlying library, and so on.
>> [...]
>
> While it is true that all the linked objects must be compiled for the
> same architecture, this kind of check is automatically performed by
> any decent linker without the need for special flags and failure to
> find matching libraries will result in a linker error.
>
> You may have to specify flags to the C compiler, though, if the
> default target architecture of the compiler doesn't match the
> architecture for which Racket and the libraries to be wrapped were
> compiled.
>
> Ciao,
> Thomas
>
>
> --
> When C++ is your hammer, every problem looks like your thumb.
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