https://git.ruby-lang.org/ruby.git/commit/?id=50aac2ffd5

From 50aac2ffd59c7b0d871a82c23048846ad2f3f38b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 22 Jul 2020 21:26:21 +0900
Subject: Share the size for sigaltstack between configure.ac and signal.c


diff --git a/configure.ac b/configure.ac
index ae908f7..2fd4c7c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2929,6 +2929,7 @@ AS_IF([test "x$ac_cv_func_backtrace" = xyes], [ https://github.com/ruby/ruby/blob/trunk/configure.ac#L2929
 #include <signal.h>
 #include <execinfo.h>
 
+]`grep '^@%:@ *define  *RUBY_SIGALTSTACK_SIZE' ${srcdir}/signal.c`[
 #define TRACE_SIZE 256
 
 void sigsegv(int signum, siginfo_t *info, void *ctx){
@@ -2948,12 +2949,12 @@ main(void) https://github.com/ruby/ruby/blob/trunk/configure.ac#L2949
     stack_t ss;
     struct sigaction sa;
 
-    ss.ss_sp = malloc(16*1024);
+    ss.ss_sp = malloc(RUBY_SIGALTSTACK_SIZE);
     if (ss.ss_sp == NULL) {
 	fprintf(stderr, "cannot allocate memory for sigaltstack\n");
 	return EXIT_FAILURE;
     }
-    ss.ss_size = 16*1024;
+    ss.ss_size = RUBY_SIGALTSTACK_SIZE;
     ss.ss_flags = 0;
     if (sigaltstack(&ss, NULL) == -1) {
 	fprintf(stderr, "sigaltstack failed\n");
diff --git a/signal.c b/signal.c
index 7f8687e..615ceb7 100644
--- a/signal.c
+++ b/signal.c
@@ -524,11 +524,13 @@ typedef RETSIGTYPE ruby_sigaction_t(int); https://github.com/ruby/ruby/blob/trunk/signal.c#L524
 #endif
 
 #ifdef USE_SIGALTSTACK
+/* XXX: BSD_vfprintf() uses >1500B stack and x86-64 need >5KiB stack. */
+#define RUBY_SIGALTSTACK_SIZE (16*1024)
+
 static int
 rb_sigaltstack_size(void)
 {
-    /* XXX: BSD_vfprintf() uses >1500B stack and x86-64 need >5KiB stack. */
-    int size = 16*1024;
+    int size = RUBY_SIGALTSTACK_SIZE;
 
 #ifdef MINSIGSTKSZ
     {
-- 
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