Set a large thread stack when running the regex tests in a thread.

For testing ithreads cloning, all the regex tests are run twice. Once
"normally", and once in a child ithread, to verify that all regex
constructions can be cloned.

The recently added tests for backreferences starting with 8 or 9 causes a
lot of C recursion in the child thread, enough to bust the default thread
stack size on (at least) HP-UX. So set a large explicit thread stack size.
It doesn't matter that it's large, as we are only running one child thread.

1 files changed, 6 insertions, 1 deletions

diff --git a/t/thread_it.pl b/t/thread_it.pl
index 37d4680411..aa5e18b97c 100644
--- a/t/thread_it.pl
+++ b/t/thread_it.pl
@@ -26,7 +26,12 @@ require $file;
 
 note('running tests in a new thread');
 
-my $curr = threads->create(sub {
+# Currently 59*4096 is the minimum stack size to just get t/re/pat_thr.t to
+# pass on HP-UX 64bit PA-RISC. The test for capture buffers (eg \87)
+# recurses heavily, and busts the default stack size (65536 on PA-RISC)
+my $curr = threads->create({
+                            stack_size => 524288,
+                           }, sub {
 			       run_tests();
 			       return defined &curr_test ? curr_test() : ()
 			   })->join();