The following patch prevents build failures due to comparisons between
a pointer and an integer. It has been adapted from openjdk@10.

diff -u -r openjdk-9.alt/hotspot/src/share/vm/memory/virtualspace.cpp openjdk-9/hotspot/src/share/vm/memory/virtualspace.cpp
--- openjdk-9.alt/hotspot/src/share/vm/memory/virtualspace.cpp	2023-04-05 13:46:58.841965513 +0200
+++ openjdk-9/hotspot/src/share/vm/memory/virtualspace.cpp	2023-04-05 13:48:43.902387837 +0200
@@ -581,7 +581,7 @@
   assert(markOopDesc::encode_pointer_as_mark(&_base[size])->decode_pointer() == &_base[size],
          "area must be distinguishable from marks for mark-sweep");
 
-  if (base() > 0) {
+  if (base() != NULL) {
     MemTracker::record_virtual_memory_type((address)base(), mtJavaHeap);
   }
 }
diff -u -r openjdk-9.alt/hotspot/src/share/vm/opto/lcm.cpp openjdk-9/hotspot/src/share/vm/opto/lcm.cpp
--- openjdk-9.alt/hotspot/src/share/vm/opto/lcm.cpp	2023-04-05 13:46:58.849965545 +0200
+++ openjdk-9/hotspot/src/share/vm/opto/lcm.cpp	2023-04-05 13:47:53.566187260 +0200
@@ -39,7 +39,7 @@
 // Check whether val is not-null-decoded compressed oop,
 // i.e. will grab into the base of the heap if it represents NULL.
 static bool accesses_heap_base_zone(Node *val) {
-  if (Universe::narrow_oop_base() > 0) { // Implies UseCompressedOops.
+  if (Universe::narrow_oop_base() != NULL) { // Implies UseCompressedOops.
     if (val && val->is_Mach()) {
       if (val->as_Mach()->ideal_Opcode() == Op_DecodeN) {
         // This assumes all Decodes with TypePtr::NotNull are matched to nodes that
g/tests/containers.scm'>
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<div class='path'>path: <a href='/guix/log/?id=1d6d048df9eda22a0544cb034606176c8f8fd5a9'>root</a>/<a href='/guix/log/tests?id=1d6d048df9eda22a0544cb034606176c8f8fd5a9'>tests</a>/<a href='/guix/log/tests/containers.scm?id=1d6d048df9eda22a0544cb034606176c8f8fd5a9'>containers.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/containers.scm?id=1d6d048df9eda22a0544cb034606176c8f8fd5a9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-01-30 22:24:27 +0100'>2023-01-30</span></td><td><a href='/guix/commit/tests/containers.scm?id=0ef8fe22ed8985c9656835fc25ab3463d55b6669'>linux-container: 'container-excursion' forks to join the PID namespace.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://issues.guix.gnu.org/61156&gt;.

* gnu/build/linux-container.scm (container-excursion): Add extra call to
'primitive-fork' and invoke THUNK in the child process.
* tests/containers.scm ("container-excursion"): Remove extra
'primitive-fork' call, now unnecessary.
("container-excursion*, /proc"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-01-30 22:24:27 +0100'>2023-01-30</span></td><td><a href='/guix/commit/tests/containers.scm?id=52eb3db19cb9e5c294c86a8552a4baaa5b473672'>container: Correctly report exit status.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/linux-container.scm (container-excursion): Return the raw
status value.
* tests/containers.scm ("container-excursion, same namespaces"): Add
'status:exit-val' call.
* guix/scripts/container/exec.scm (guix-container-exec): Correctly
handle the different cases.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-01 12:51:13 +0200'>2020-10-01</span></td><td><a href='/guix/commit/tests/containers.scm?id=e74818353882f187e5971b5a3a481f17df883dbe'>linux-container: Reset jailed root permissions.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/linux-container.scm (mount-file-systems): Add 'chmod' call.
* tests/containers.scm
("call-with-container, mnt namespace, root permissions"): New test.
</span></span></td><td>Jelle Licht</td></tr>