From 1a82ed6a254c61f1bb73502aeafeb52d3aee046f Mon Sep 17 00:00:00 2001
From: Nicholas Clark <nick@ccl4.org>
Date: Tue, 22 Jun 2021 13:59:19 +0000
Subject: cygwin can't support C11 thread local in shared objects, so disable
 it.

This seems to be an unresolved bug in binutils, rather than any fundamental
object format problem.
---
 hints/cygwin.sh | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'hints')

diff --git a/hints/cygwin.sh b/hints/cygwin.sh
index 20e0e58821..40edf5f6b1 100644
--- a/hints/cygwin.sh
+++ b/hints/cygwin.sh
@@ -80,3 +80,9 @@ lddlflags="$lddlflags $ldflags"
 #ldflags="$ldflags -s"
 #ccdlflags="$ccdlflags -s"
 #lddlflags="$lddlflags -s"
+
+# Seems that exporting _Thread_local doesn't work on cygwin. This 6 year old
+# gcc bug suggests that maybe the problem really is binutils, but either way
+# it still doesn't work, despite our probes looking good:
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
+d_thread_local=undef
-- 
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