From bda3238c89fa4673c8772ad02f1949fc19b41a5e Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 14 Sep 2021 08:12:48 -0400
Subject: [PATCH] Add fallback atexit implementation using template descrutors

Fixes https://github.com/harfbuzz/harfbuzz/issues/3197
---
 src/hb.hh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hb.hh b/src/hb.hh
index 4ba46eaa0..7c72179fc 100644
--- a/src/hb.hh
+++ b/src/hb.hh
@@ -449,7 +449,8 @@ static int HB_UNUSED _hb_errno = 0;
 #  ifdef HAVE_ATEXIT
 #    define hb_atexit atexit
 #  else
-#    error "atexit not found."
+     template <void (*function) (void)> struct hb_atexit_t { ~hb_atexit_t () { function (); } };
+#    define hb_atexit(f) static hb_atexit_t<f> _hb_atexit_##__LINE__;
 #  endif
 #endif