Fix uses of libwinpthread on mingw 10.

* m4/threadlib.m4 (gl_WEAK_SYMBOLS): On mingw, set the result to
"guessing no".

2 files changed, 12 insertions, 5 deletions

diff --git a/ChangeLog b/ChangeLog
index ca6b2caf69..485ed10025 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2023-04-20  Bruno Haible  <bruno@clisp.org>
 
+	Fix uses of libwinpthread on mingw 10.
+	* m4/threadlib.m4 (gl_WEAK_SYMBOLS): On mingw, set the result to
+	"guessing no".
+
+2023-04-20  Bruno Haible  <bruno@clisp.org>
+
 	Move remaining call_once tests from mtx-tests to call_once-tests.
 	* tests/test-call_once1.c: Renamed from tests/test-call_once.c.
 	* tests/test-call_once2.c: New file, based on tests/test-mtx.c.
diff --git a/m4/threadlib.m4 b/m4/threadlib.m4
index 7202b9528d..c19d047221 100644
--- a/m4/threadlib.m4
+++ b/m4/threadlib.m4
@@ -1,4 +1,4 @@
-# threadlib.m4 serial 35
+# threadlib.m4 serial 36
 dnl Copyright (C) 2005-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -85,10 +85,11 @@ AC_DEFUN([gl_WEAK_SYMBOLS],
   AC_CACHE_CHECK([whether imported symbols can be declared weak],
     [gl_cv_have_weak],
     [case "$host_os" in
-       cygwin*)
-         dnl On Cygwin 3.2.0 with gcc 10.2, the test below would succeed, but
-         dnl programs that use pthread_in_use() with weak symbol references
-         dnl crash miserably at runtime.
+       cygwin* | mingw*)
+         dnl On Cygwin 3.2.0 with gcc 10.2, and likewise on mingw 10.0.0 with
+         dnl gcc 11.3, the test below would succeed, but programs that use
+         dnl pthread_in_use() with weak symbol references crash miserably at
+         dnl runtime.
          gl_cv_have_weak="guessing no"
          ;;
        *)