There is also the feature-test egg which is useful in combination with the FFI. Jim
> On Nov 3, 2013, at 9:56, Matt Welland <estifo...@gmail.com> wrote: > > Hi Peter, > > It looks like cond-expand does enough to achieve what I want. Thanks! > > Matt > -=- > > >> On Sun, Nov 3, 2013 at 2:58 AM, Peter Bex <peter....@xs4all.nl> wrote: >> On Sat, Nov 02, 2013 at 11:35:22PM -0700, Matt Welland wrote: >> > I'm curious to hear opinions on conditional complication and configuration >> > using Chicken scheme. >> > >> > Say for example I want to enable or disable the use of a particular library >> > or feature and I want there to be no trace of it in the executable. >> > >> > I can use a preprocessor such as cpp but I imagine there is a better way. >> > Any strategies or methodologies you all can share? Are macros good for >> > this? >> >> Hi Matt, >> >> Usually when I want to do something like this, I use cond-expand and >> provide the feature via -feature provide-foo: >> >> (define (foo) >> (cond-expand >> (provide-foo (do-whatever-foo-does)) >> (else (error "support for foo is disabled")))) >> >> This is used extensively by the "crypt" egg to select which >> fallback implementations need to be provided and for which >> implementations it can use the one provided by libc. >> >> This is of course only available when compiling from Scheme. >> If you want to ship precompiled C files (so you'll only need >> a C compiler and libchicken), you'd have to use C preprocessor >> and/or conditional compilation of various different implementation >> files through Make like CHICKEN itself does (for posixunix/posixwin, >> and for things like HAVE_POSIX_POLL). This is a lot trickier to >> do right, and I wouldn't recommend it unless you really have to. >> >> Cheers, >> Peter >> -- >> http://www.more-magic.net > > > > -- > Matt > -=- > 90% of the nations wealth is held by 2% of the people. Bummer to be in the > majority... > _______________________________________________ > Chicken-users mailing list > Chicken-users@nongnu.org > https://lists.nongnu.org/mailman/listinfo/chicken-users
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