From 6fba930c381e1c2adac7ffa23156a68b714fab6a Mon Sep 17 00:00:00 2001
From: Jim Hester <james.f.hester@gmail.com>
Date: Thu, 24 Jun 2021 10:47:29 -0400
Subject: [PATCH] Use a constant value for the stack size

Fixes #1373
---
 NEWS.md                              | 3 +++
 inst/include/testthat/vendor/catch.h | 6 +++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/NEWS.md b/NEWS.md
index bb6a68e38..e09140479 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,8 @@
 # testthat (development version)
 
+* The vendored Catch code used for `use_catch()` now uses an constant value for the stack size rather than relying on SIGSTKSZ.
+  This fixes compatibility for recent glibc versions where SIGSTKSZ is no longer a constant.
+
 # testthat 3.0.2
 
 * Failing expectations now include a backtrace when they're not called directly
diff --git a/inst/include/testthat/vendor/catch.h b/inst/include/testthat/vendor/catch.h
index b1b4a474e..e8a10b07e 100644
--- a/inst/include/testthat/vendor/catch.h
+++ b/inst/include/testthat/vendor/catch.h
@@ -6492,7 +6492,7 @@ namespace Catch {
         static bool isSet;
         static struct sigaction oldSigActions [sizeof(signalDefs)/sizeof(SignalDefs)];
         static stack_t oldSigStack;
-        static char altStackMem[SIGSTKSZ];
+        static char altStackMem[32768];
 
         static void handleSignal( int sig ) {
             std::string name = "<unknown signal>";
@@ -6512,7 +6512,7 @@ namespace Catch {
             isSet = true;
             stack_t sigStack;
             sigStack.ss_sp = altStackMem;
-            sigStack.ss_size = SIGSTKSZ;
+            sigStack.ss_size = 32768;
             sigStack.ss_flags = 0;
             sigaltstack(&sigStack, &oldSigStack);
             struct sigaction sa = { 0 };
@@ -6543,7 +6543,7 @@ namespace Catch {
     bool FatalConditionHandler::isSet = false;
     struct sigaction FatalConditionHandler::oldSigActions[sizeof(signalDefs)/sizeof(SignalDefs)] = {};
     stack_t FatalConditionHandler::oldSigStack = {};
-    char FatalConditionHandler::altStackMem[SIGSTKSZ] = {};
+    char FatalConditionHandler::altStackMem[32768] = {};
 
 } // namespace Catch