gnu: OpenJDK@9: Fix build with newer toolchain.

* gnu/packages/java.scm (openjdk9)[source](patches): New field.
* gnu/packages/patches/openjdk-9-hotspot-pointer-comparison.patch,
gnu/packages/patches/openjdk-9-hotspot-stack-size.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.

1 files changed, 28 insertions, 0 deletions

diff --git a/gnu/packages/patches/openjdk-9-hotspot-stack-size.patch b/gnu/packages/patches/openjdk-9-hotspot-stack-size.patch
new file mode 100644
index 0000000000..27af0ab6c2
--- /dev/null
+++ b/gnu/packages/patches/openjdk-9-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/hotspot/test/runtime/StackGuardPages/exeinvoke.c b/hotspot/test/runtime/StackGuardPages/exeinvoke.c
+--- a/hotspot/test/runtime/StackGuardPages/exeinvoke.c
++++ b/hotspot/test/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,