SPDX-License-Identifier: GPL-3.0-or-later

Avoid requiring scm_gc_register_allocation to be exported from the
main Guile executable. Static Guile builds in this bootstrap do not
provide that symbol to dynamic-func, so fall back to a no-op.

--- guile-lzlib/lzlib.scm
+++ guile-lzlib/lzlib.scm
@@ -56,10 +56,15 @@
 (define %liblz-handle
   (delay (dynamic-link %liblz)))
 
-(define register-allocation
-  ;; Let the GC know that an unmanaged heap allocation took place.
-  (pointer->procedure void
-                      (dynamic-func "scm_gc_register_allocation"
-                                    (dynamic-link))
-                      (list size_t)))
+(define register-allocation
+  ;; Let the GC know that an unmanaged heap allocation took place.
+  ;; Static Guile builds may not export this symbol from the main program.
+  (match (false-if-exception
+          (dynamic-func "scm_gc_register_allocation"
+                        (dynamic-link)))
+    ((? pointer? proc)
+     (pointer->procedure void proc (list size_t)))
+    (#f
+     (lambda (_size)
+       #t))))
 
 (define (lzlib-procedure ret name parameters)
   "Return a procedure corresponding to C function NAME in liblz, or #f if