gnu: sbcl-png: Fix compiling with sbcl >= 2.1.6.

* gnu/packages/patches/sbcl-png-fix-sbcl-compatibility.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/lisp-xyz.scm (sbcl-png)[source]: Use it.

gnu/local.mk

@@ -1742,6 +1742,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/rust-openssl-sys-no-vendor.patch	\
   %D%/packages/patches/sbc-fix-build-non-x86.patch		\
   %D%/packages/patches/sbcl-clml-fix-types.patch		\
+  %D%/packages/patches/sbcl-png-fix-sbcl-compatibility.patch	\
   %D%/packages/patches/scalapack-blacs-mpi-deprecations.patch	\
   %D%/packages/patches/scheme48-tests.patch			\
   %D%/packages/patches/scotch-build-parallelism.patch		\

gnu/packages/lisp-xyz.scm

@@ -9408,7 +9408,9 @@ (define-public sbcl-png
                (commit commit)))
          (file-name (git-file-name "cl-png" version))
          (sha256
-          (base32 "173hqwpd0rwqf95mfx1h9l9c3i8bb0gvnpspzmmz3g5x3440czy4"))))
+          (base32 "173hqwpd0rwqf95mfx1h9l9c3i8bb0gvnpspzmmz3g5x3440czy4"))
+         ;; Patch to fix compiling with SBCL >= 2.1.6.
+         (patches (search-patches "sbcl-png-fix-sbcl-compatibility.patch"))))
       (build-system asdf-build-system/sbcl)
       (arguments
        `(#:phases

gnu/packages/patches/sbcl-png-fix-sbcl-compatibility.patch

@@ -0,0 +1,60 @@
+From 60bbad167b0691995a659121acda55392e4021b6 Mon Sep 17 00:00:00 2001
+From: Andrew Berkley <ajb@dwavesys.com>
+Date: Sun, 4 Jul 2021 12:50:34 -0700
+Subject: [PATCH] Fix for sbcl 2.1.6
+
+---
+ compat.lisp | 30 +++++++++++++++---------------
+ 1 file changed, 15 insertions(+), 15 deletions(-)
+
+diff --git a/compat.lisp b/compat.lisp
+index 95a9869..ea6d1a1 100644
+--- a/compat.lisp
++++ b/compat.lisp
+@@ -1,12 +1,13 @@
+ (in-package #:png)
+ 
+-#+sbcl ; Present in SBCL 1.0.24.
+-(declaim (ftype (function (array) (values (simple-array * (*)) &optional))
+-                array-storage-vector))
+-
+ #+sbcl
+-(defun array-storage-vector (array)
+-  "Returns the underlying storage vector of ARRAY, which must be a non-displaced array.
++(macrolet ((make-array-storage-vector ()
++             (let ((%array-data-vector (or (find-symbol "%ARRAY-DATA-VECTOR" :sb-kernel)
++                                           (find-symbol "%ARRAY-DATA" :sb-kernel)))) ;; renamed in sbcl 2.1.6
++               `(progn
++                  (declaim (ftype (function (array) (values (simple-array * (*)) &optional)) array-storage-vector))
++                  (defun array-storage-vector (array)
++                    "Returns the underlying storage vector of ARRAY, which must be a non-displaced array.
+ 
+ In SBCL, if ARRAY is a of type \(SIMPLE-ARRAY * \(*)), it is its own storage
+ vector. Multidimensional arrays, arrays with fill pointers, and adjustable
+@@ -16,15 +17,14 @@ ARRAY, which this function returns.
+ Important note: the underlying vector is an implementation detail. Even though
+ this function exposes it, changes in the implementation may cause this
+ function to be removed without further warning."
+-  ;; KLUDGE: Without TRULY-THE the system is not smart enough to
+-  ;; figure out that the return value is always of the known type.
+-  (sb-ext:truly-the (simple-array * (*))
+-             (if (sb-kernel:array-header-p array)
+-                 (if (sb-kernel:%array-displaced-p array)
+-                     (error "~S cannot be used with displaced arrays. Use ~S instead."
+-                            'array-storage-vector 'array-displacement)
+-                     (sb-kernel:%array-data-vector array))
+-                 array)))
++                    (sb-ext:truly-the (simple-array * (*))
++                                      (if (sb-kernel:array-header-p array)
++                                          (if (sb-kernel:%array-displaced-p array)
++                                              (error "~S cannot be used with displaced arrays. Use ~S instead."
++                                                     'array-storage-vector 'array-displacement)
++                                              (,%array-data-vector array))
++                                          array)))))))
++  (make-array-storage-vector))
+ 
+ #+allegro
+ (defmacro with-pointer-to-array-data ((ptr-var array) &body body)
+-- 
+2.33.0
+