On Fri, 2 Jan 2009, Luís Oliveira wrote:
On Fri, Jan 2, 2009 at 5:26 AM, Daniel Herring <dherring@tentpost.com> wrote:
FFI is an optional clisp feature. Thus I propose adding it to CFFI's list of dependencies. [...] + :depends-on (alexandria trivial-features babel #+clisp ffi) [...]
How about a #-ffi (error "CFFI requires a version of CLISP compiled with the FFI module.") in src/cffi-clisp.lisp? Or something like that in cffi.asd. What'd be the advantage of putting that in the ASD file?
I'm trying to write a tool to load a collection of ASDF packages, skipping those which won't work on a given implementation/platform. With ffi in the ASD defsystem, I can query asdf:component-depends-on before loading or handle ASDF:MISSING-DEPENDENCY at load time. An ad-hoc error requires me to know in advance not to load CFFI, but it does provide a custom error message. - Daniel P.S. I think its an ASDF defect that there is no mechanism for separately specifying dependencies on other packages, *features*, and arbitrary predicate functions. With optional documentation for each.