https://git.ruby-lang.org/ruby.git/commit/?id=5df653caaa

From 5df653caaa1a666172d889760786cdf26952a1a7 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 9 May 2021 16:11:52 +0000
Subject: fix macos build

note that this is not a security fix, but recognized as critical build problem.
[Backport #17777]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67942 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/fiddle/closure.c  |  5 +----
 ext/fiddle/extconf.rb | 13 +++++++++++--
 version.h             | 10 +++++-----
 vm.c                  |  4 +++-
 4 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/ext/fiddle/closure.c b/ext/fiddle/closure.c
index 1a80b2b..2044c83 100644
--- a/ext/fiddle/closure.c
+++ b/ext/fiddle/closure.c
@@ -14,10 +14,7 @@ typedef struct { https://github.com/ruby/ruby/blob/trunk/ext/fiddle/closure.c#L14
 } fiddle_closure;
 
 #if defined(USE_FFI_CLOSURE_ALLOC)
-#elif defined(__OpenBSD__) || defined(__APPLE__) || defined(__linux__)
-# define USE_FFI_CLOSURE_ALLOC 0
-#elif defined(RUBY_LIBFFI_MODVERSION) && RUBY_LIBFFI_MODVERSION < 3000005 && \
-	(defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_AMD64))
+#elif !defined(HAVE_FFI_CLOSURE_ALLOC)
 # define USE_FFI_CLOSURE_ALLOC 0
 #else
 # define USE_FFI_CLOSURE_ALLOC 1
diff --git a/ext/fiddle/extconf.rb b/ext/fiddle/extconf.rb
index fce0cb4..dc53f22 100644
--- a/ext/fiddle/extconf.rb
+++ b/ext/fiddle/extconf.rb
@@ -13,7 +13,7 @@ if ! bundle https://github.com/ruby/ruby/blob/trunk/ext/fiddle/extconf.rb#L13
   if have_header(ffi_header = 'ffi.h')
     true
   elsif have_header(ffi_header = 'ffi/ffi.h')
-    $defs.push(format('-DUSE_HEADER_HACKS'))
+    $defs.push('-DUSE_HEADER_HACKS')
     true
   end and (have_library('ffi') || have_library('libffi'))
 end or
@@ -116,6 +116,15 @@ if ver https://github.com/ruby/ruby/blob/trunk/ext/fiddle/extconf.rb#L116
   ver = ver.gsub(/-rc\d+/, '') # If ver contains rc version, just ignored.
   ver = (ver.split('.') + [0,0])[0,3]
   $defs.push(%{-DRUBY_LIBFFI_MODVERSION=#{ '%d%03d%03d' % ver }})
+  warn "libffi_version: #{ver.join('.')}"
+end
+
+case
+when $mswin, $mingw, (ver && (ver <=> [3, 2]) >= 0)
+  $defs << "-DUSE_FFI_CLOSURE_ALLOC=1"
+when (ver && (ver <=> [3, 2]) < 0)
+else
+  have_func('ffi_closure_alloc', ffi_header)
 end
 
 have_header 'sys/mman.h'
@@ -142,7 +151,7 @@ types.each do |type, signed| https://github.com/ruby/ruby/blob/trunk/ext/fiddle/extconf.rb#L151
   if /^\#define\s+SIZEOF_#{type}\s+(SIZEOF_(.+)|\d+)/ =~ config
     if size = $2 and size != 'VOIDP'
       size = types.fetch(size) {size}
-      $defs << format("-DTYPE_%s=TYPE_%s", signed||type, size)
+      $defs << "-DTYPE_#{signed||type}=TYPE_#{size}"
     end
     if signed
       check_signedness(type.downcase, "stddef.h")
diff --git a/version.h b/version.h
index 1c491eb..dd836d4 100644
--- a/version.h
+++ b/version.h
@@ -1,10 +1,10 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
-#define RUBY_VERSION "2.6.7"
-#define RUBY_RELEASE_DATE "2021-04-05"
-#define RUBY_PATCHLEVEL 197
+#define RUBY_VERSION "2.6.8"
+#define RUBY_RELEASE_DATE "2021-05-10"
+#define RUBY_PATCHLEVEL 198
 
 #define RUBY_RELEASE_YEAR 2021
-#define RUBY_RELEASE_MONTH 4
-#define RUBY_RELEASE_DAY 5
+#define RUBY_RELEASE_MONTH 5
+#define RUBY_RELEASE_DAY 10
 
 #include "ruby/version.h"
 
diff --git a/vm.c b/vm.c
index 0954aa7..04b8b96 100644
--- a/vm.c
+++ b/vm.c
@@ -2263,6 +2263,8 @@ free_loading_table_entry(st_data_t key, st_data_t value, st_data_t arg) https://github.com/ruby/ruby/blob/trunk/vm.c#L2263
     return ST_DELETE;
 }
 
+extern void rb_native_mutex_destroy(rb_nativethread_lock_t *lock);
+
 int
 ruby_vm_destruct(rb_vm_t *vm)
 {
@@ -2486,7 +2488,7 @@ rb_execution_context_mark(const rb_execution_context_t *ec) https://github.com/ruby/ruby/blob/trunk/vm.c#L2488
 	rb_gc_mark_machine_stack(ec);
 	rb_gc_mark_locations((VALUE *)&ec->machine.regs,
 			     (VALUE *)(&ec->machine.regs) +
-			     sizeof(ec->machine.regs) / sizeof(VALUE));
+			     sizeof(ec->machine.regs) / (sizeof(VALUE)));
     }
 
     RUBY_MARK_UNLESS_NULL(ec->errinfo);
-- 
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