Hi!

In order for these commands to generate a fasl per ASDF system, I had to apply the patch below to ASDF.

 $ ./abcl
 CL-USER(1): :ld c:/users/erik/quicklisp/setup
 CL-USER(2): (ql:quickload :bordeaux-threads)
 CL-USER(3): (asdf:oos 'asdf:binary-op :bordeax-threads)

The commands above work with current trunk (r14460) and produces 2 concatenated fasls in my cache directory: 1 for alexandria and 1 for bordeaux-threads.

This patch is required (also attached, to prevent line wrapping):

diff --git a/bundle.lisp b/bundle.lisp
index 568f894..24fbf90 100644
--- a/bundle.lisp
+++ b/bundle.lisp
@@ -185,7 +185,7 @@
       (or #+ecl (or (equalp type (compile-file-type :type :object))
                     (equalp type (compile-file-type :type :static-library)))
           #+mkcl (equalp type (compile-file-type :fasl-p nil))
-          #+(or allegro clisp clozure cmu lispworks sbcl scl xcl) (equalp type (compile-file-type)))))
+          #+(or abcl allegro clisp clozure cmu lispworks sbcl scl xcl) (equalp type (compile-file-type)))))

   (defgeneric* (trivial-system-p) (component))

diff --git a/uiop/lisp-build.lisp b/uiop/lisp-build.lisp
index e2e376d..4b7e819 100644
--- a/uiop/lisp-build.lisp
+++ b/uiop/lisp-build.lisp
@@ -669,11 +669,12 @@ it will filter them appropriately."
 ;;; Links FASLs together
 (with-upgradability ()
   (defun combine-fasls (inputs output)
-    #-(or allegro clisp clozure cmu lispworks sbcl scl xcl)
+    #-(or abcl allegro clisp clozure cmu lispworks sbcl scl xcl)
     (error "~A does not support ~S~%inputs ~S~%output  ~S"
            (implementation-type) 'combine-fasls inputs output)
     #+clozure (ccl:fasl-concatenate output inputs :if-exists :supersede)
     #+(or allegro clisp cmu sbcl scl xcl) (concatenate-files inputs output)
+    #+abcl (sys:concatenate-fasls inputs output)
     #+lispworks
     (let (fasls)
       (unwind-protect