https://git.ruby-lang.org/ruby.git/commit/?id=9cfa811b0f

From 9cfa811b0f209d714f89fe0de6778c71f77556c7 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 13 May 2020 08:39:50 +0900
Subject: Do not try ffi_closure_alloc if libffi is <= 3.1

Maybe due to e1855100e46040e73630b378974c17764e0cccee, CentOS, RHEL, and
Fedora CIs have started failing with SEGV.  Try to avoid
ffi_closure_alloc on those environments.

https://rubyci.org/logs/rubyci.s3.amazonaws.com/centos8/ruby-master/log/20200512T183004Z.fail.html.gz
https://rubyci.org/logs/rubyci.s3.amazonaws.com/fedora32/ruby-master/log/20200512T183004Z.fail.html.gz
https://rubyci.org/logs/rubyci.s3.amazonaws.com/rhel8/ruby-master/log/20200512T183003Z.fail.html.gz

diff --git a/ext/fiddle/extconf.rb b/ext/fiddle/extconf.rb
index 120c4ce..35e5a31 100644
--- a/ext/fiddle/extconf.rb
+++ b/ext/fiddle/extconf.rb
@@ -122,6 +122,7 @@ end https://github.com/ruby/ruby/blob/trunk/ext/fiddle/extconf.rb#L122
 case
 when $mswin, $mingw, (ver && (ver <=> [3, 2]) >= 0)
   $defs << "-DUSE_FFI_CLOSURE_ALLOC=1"
+when (ver && (ver <=> [3, 1]) <= 0)
 else
   have_func('ffi_closure_alloc', ffi_header)
 end
-- 
cgit v0.10.2


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