Greetings.

Is there a recommended way to detect whether racket is a 32- or 64-bit 
executable?

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.

I can't find any guidance in the list archive about this.  Things like 
(system-library-subpath) could be parsed for hints, but that's obviously rather 
fragile.  Nothing else in "14.7 Environment and Runtime Information" seems to 
give this information.

I could just press ahead and let the eventual raco link fail, if there's a 
mismatch, during the build.  But since the default racket download (on OS X) is 
32-bit, and most libraries will be build 64-bit by default, there's a 
reasonable likelihood of a mismatch, and it seems at least polite to let the 
user know about this at configure time, rather than build time.

Thanks for any pointers.  Best wishes,

Norman


-- 
Norman Gray  :  http://nxg.me.uk
SUPA School of Physics and Astronomy, University of Glasgow, UK


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