[jdk17] RFR: 8272472: StackGuardPages test doesn't build with glibc 2.34

[Jie Fu]

On Sun, 15 Aug 2021 23:03:03 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Please review this simple test fix to address an issue that will prevent the JDK 17 test sources from building on more recent Linux distributions with Glibc 2.34. When building under _GNU_SOURCE the value of SIGSTKSZ is no longer a constant and so cannot be used in an array declaration. The simple fix is to malloc the array instead.
> 
> This is a PR against 17 pending a decision as to whether this needs to, and can be, addressed in 17. If not then this PR will be withdrawn and resubmitted against 18 with a backport to 17u.
> 
> Testing: local & mach5 tiers 1-3
> 
> Thanks,
> David

test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c line 75:

> 73: void set_signal_handler() {
> 74:   if (altstack == NULL) {
> 75:     // Dynamically allocated incase SIGSTKSZ is not constant

"incase" --> "in case"?
Also need to update the copyright year.

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PR: https://git.openjdk.java.net/jdk17/pull/304