From 4fef1fcede8c7934a72b715f15fd7747c6b74618 Mon Sep 17 00:00:00 2001
From: Alexei Podtelezhnikov <apodtele@gmail.com>
Date: Fri, 10 Jun 2022 11:34:56 -0400
Subject: [PATCH] [smooth] Fix GCC LTO crashes on Windows.

Fixes #1164 by using a volatile variable around `setjmp`.  It is hard to
say how this fixes crashes related to certain link-time optimizations.
This does not decrease the rendering performance.

* src/smooth/ftgrays.c (gray_convert_glyph_inner): Use volatile `error`.
---
 src/smooth/ftgrays.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index bff3c5903..28a081cbc 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -1912,7 +1912,7 @@ typedef ptrdiff_t  FT_PtrDist;
   gray_convert_glyph_inner( RAS_ARG_
                             int  continued )
   {
-    int  error;
+    volatile int  error;
 
 
     if ( ft_setjmp( ras.jump_buffer ) == 0 )