gnu: OpenJDK@10: Fix build with newer toolchains.

* gnu/packages/java.scm (openjdk10)[source](patches): Add two patches.
[source](snippet): While here, simplify.
* gnu/packages/patches/openjdk-10-hotspot-pointer-comparison.patch,
gnu/packages/patches/openjdk-10-hotspot-stack-size.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.

gnu/local.mk

@@ -1566,6 +1566,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/openjdk-9-hotspot-pointer-comparison.patch	\
   %D%/packages/patches/openjdk-9-hotspot-stack-size.patch	\
   %D%/packages/patches/openjdk-10-idlj-reproducibility.patch	\
+  %D%/packages/patches/openjdk-10-hotspot-pointer-comparison.patch	\
+  %D%/packages/patches/openjdk-10-hotspot-stack-size.patch	\
   %D%/packages/patches/openjdk-15-xcursor-no-dynamic.patch	\
   %D%/packages/patches/openmpi-mtl-priorities.patch		\
   %D%/packages/patches/openssh-hurd.patch			\

gnu/packages/java.scm

@@ -1729,12 +1729,12 @@ new Date();"))
                (base32
                 "0zywq2203b4hx4jms9vbwvjcj1d3k2v3qpx4s33729fkpmid97r4"))
               (patches (search-patches
-                        "openjdk-10-idlj-reproducibility.patch"))
+                        "openjdk-10-idlj-reproducibility.patch"
+                        "openjdk-10-hotspot-pointer-comparison.patch"
+                        "openjdk-10-hotspot-stack-size.patch"))
               (modules '((guix build utils)))
               (snippet
-               `(begin
+               '(for-each delete-file (find-files "." "\\.(bin|exe|jar)$")))))
-                  (for-each delete-file (find-files "." ".*.(bin|exe|jar)$"))
-                  #t))))
     (arguments
      (substitute-keyword-arguments (package-arguments openjdk9)
        ((#:phases phases)

gnu/packages/patches/openjdk-10-hotspot-pointer-comparison.patch

@@ -0,0 +1,15 @@
+Avoid ordered comparison of pointer with integer to prevent compile error
+with GCC 11.
+
+diff --git a/src/hotspot/os/linux/os_linux.cpp b/src/hotspot/os/linux/os_linux.cpp
+--- a/src/hotspot/os/linux/os_linux.cpp
++++ b/src/hotspot/os/linux/os_linux.cpp
+@@ -2155,7 +2155,7 @@ void os::Linux::print_container_info(outputStream* st) {
+     }
+ 
+     p = OSContainer::cpu_cpuset_memory_nodes();
+-    if (p < 0)
++    if (p == NULL)
+       st->print("cpu_memory_nodes() failed\n");
+     else {
+       st->print("cpu_memory_nodes: %s\n", p);

gnu/packages/patches/openjdk-10-hotspot-stack-size.patch

@@ -0,0 +1,28 @@
+Dynamically allocate the stack since SIGSTKSZ is not constant since glibc 2.34.
+
+Backported from:
+
+  https://github.com/openjdk/jdk17u/commit/bb7c412e259893091210267252faf3c0a1be0969
+
+diff --git a/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c b/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c
+--- a/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c
++++ b/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c
+@@ -67,8 +67,17 @@ static void handler(int sig, siginfo_t *si, void *unused) {
+   longjmp(context, 1);
+ }
+ 
++static char* altstack = NULL;
++
+ void set_signal_handler() {
+-  static char altstack[SIGSTKSZ];
++  if (altstack == NULL) {
++    // Dynamically allocated in case SIGSTKSZ is not constant
++    altstack = malloc(SIGSTKSZ);
++    if (altstack == NULL) {
++      fprintf(stderr, "Test ERROR. Unable to malloc altstack space\n");
++      exit(7);
++    }
++  }
+ 
+   stack_t ss = {
+     .ss_size = SIGSTKSZ,