From fe8295f8834bdc1f2f41526ddc42e9ad6e2b3d8c Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Tue, 1 Sep 2026 10:39:23 +0900
Subject: m4: Detect GNU Hurd thread feature correctly.

* m4/threadlib.m4: Detect gl_pthread_in_glibc on Hurd with GNU C
library >= 2.43.

--

Co-authored-by: Samuel Thibault <sthibault@debian.org>
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
---
 m4/threadlib.m4 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/m4/threadlib.m4 b/m4/threadlib.m4
index a16d626..4334c8d 100644
--- a/m4/threadlib.m4
+++ b/m4/threadlib.m4
@@ -212,6 +212,8 @@ AC_DEFUN([gl_PTHREADLIB_BODY],
       gl_pthread_in_glibc=no
       # On Linux with glibc >= 2.34, libc contains the fully functional
       # pthread functions.
+      # On Hurd with glibc >= 2.43, libc contains the fully functional
+      # pthread functions.
       AS_CASE([$host_os],
         [linux*],
          [
@@ -225,6 +227,19 @@ AC_DEFUN([gl_PTHREADLIB_BODY],
             ],
             [gl_pthread_in_glibc=yes],
             [])
+         ],
+        [gnu*],
+         [
+          AC_EGREP_CPP([Lucky user],
+            [#include <features.h>
+             #ifdef __GNU_LIBRARY__
+              #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 43) || (__GLIBC__ > 2)
+               Lucky user
+              #endif
+             #endif
+            ],
+            [gl_pthread_in_glibc=yes],
+            [])
          ])
       echo "$as_me:__oline__: gl_pthread_in_glibc=$gl_pthread_in_glibc" >&AS_MESSAGE_LOG_FD
 
-- 
cgit