Re: [Caml-list] detecting 32/64 bit from C

[Gerd Stolpmann <info@gerd-stolpmann.de>]

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Am Dienstag, den 13.10.2015, 14:24 +0200 schrieb Adrien Nader:
> On Tue, Oct 13, 2015, Markus Weißmann wrote:
> > Hello,
> > 
> > is there some "official" way to detect -- from C -- if OCaml was
> > compiled for 32 or 64 bit?
> > I'd love to have something like a #define that either says 32 or 64
> > bit;
> > I need to know at compile time if the OCaml system uses 31 or 63 bit
> > sized integers (in the C code).
> > I don't care what the underlying OS or hardware does, but just what
> > OCaml is using.
> > 
> > Btw.: Is [Sys.word_size = 32] for 32 bit OCaml compilers on 64 bit
> > machines?

Yes.

> 
> Hi,
> 
> I believe config.h has the info you want:
>   #define ARCH_SIXTYFOUR // for instance

Exactly.

> Note how it's installed under $(libdir) and not $(includedir): its
> content is set at configure-time and depends on the architecture that
> ocaml has been configured for.

config.h should be available in $stdlib/caml. It is included from the
other header files.

Gerd

> -- 
> Adrien Nader
> 

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Gerd Stolpmann, Darmstadt, Germany    gerd@gerd-stolpmann.de
My OCaml site:          http://www.camlcity.org
Contact details:        http://www.camlcity.org/contact.html
Company homepage:       http://www.gerd-stolpmann.de
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