https://git.ruby-lang.org/ruby.git/commit/?id=122ce52e8f

From 122ce52e8f4f1a7654e0e2f80081487e23af42ce Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 13 Jun 2021 14:29:01 +0900
Subject: Check if alternative malloc header can work in C++

jemalloc (5.2.1 at least) cannot compile in C++ on macOS SDK, due
to conflicts on exception specification.
---
 ext/-test-/cxxanyargs/extconf.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ext/-test-/cxxanyargs/extconf.rb b/ext/-test-/cxxanyargs/extconf.rb
index d1d2469..9749f42 100644
--- a/ext/-test-/cxxanyargs/extconf.rb
+++ b/ext/-test-/cxxanyargs/extconf.rb
@@ -12,6 +12,10 @@ cxx.instance_variable_set(:'@have_devel', true) https://github.com/ruby/ruby/blob/trunk/ext/-test-/cxxanyargs/extconf.rb#L12
 ok = cxx.try_link(<<~'begin', "") do |x|
   #include "ruby/config.h"
 
+  #ifdef RUBY_ALTERNATIVE_MALLOC_HEADER
+  # include RUBY_ALTERNATIVE_MALLOC_HEADER
+  #endif
+
   namespace {
       typedef int conftest1[SIZEOF_LONG == sizeof(long) ? 1 : -1];
       typedef int conftest2[SIZEOF_VOIDP == sizeof(void*) ? 1 : -1];
-- 
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