1 files changed, 24 insertions, 8 deletions

diff --git a/gl/m4/ssize_t.m4 b/gl/m4/ssize_t.m4
index 1c12c33e..a2ffd6fc 100644
--- a/gl/m4/ssize_t.m4
+++ b/gl/m4/ssize_t.m4
@@ -1,23 +1,39 @@
-# ssize_t.m4 serial 5 (gettext-0.18.2)
-dnl Copyright (C) 2001-2003, 2006, 2010-2023 Free Software Foundation, Inc.
+# ssize_t.m4
+# serial 6
+dnl Copyright (C) 2001-2003, 2006, 2010-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
 
 dnl From Bruno Haible.
-dnl Test whether ssize_t is defined.
+dnl Define ssize_t if it does not already exist.
 
 AC_DEFUN([gt_TYPE_SSIZE_T],
 [
-  AC_CACHE_CHECK([for ssize_t], [gt_cv_ssize_t],
+  AC_CACHE_CHECK([for ssize_t], [gl_cv_ssize_t],
     [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
           [[#include <sys/types.h>]],
           [[int x = sizeof (ssize_t *) + sizeof (ssize_t);
             return !x;]])],
-       [gt_cv_ssize_t=yes], [gt_cv_ssize_t=no])])
-  if test $gt_cv_ssize_t = no; then
-    AC_DEFINE([ssize_t], [int],
-              [Define as a signed type of the same size as size_t.])
+       [gl_cv_ssize_t=yes], [gl_cv_ssize_t=no])])
+  if test $gl_cv_ssize_t = no; then
+    dnl On 64-bit native Windows, ssize_t needs to be defined as 'long long',
+    dnl for consistency with the 64-bit size_t.
+    AC_CACHE_CHECK([whether size_t is wider than 'long'], [gl_cv_size_t_large],
+      [AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM(
+            [[#include <sys/types.h>
+              typedef int array [2 * (sizeof (size_t) > sizeof (long)) - 1];
+            ]])],
+         [gl_cv_size_t_large=yes], [gl_cv_size_t_large=no])])
+    if test $gl_cv_size_t_large = yes; then
+      gl_def_ssize_t='long long'
+    else
+      gl_def_ssize_t='long'
+    fi
+    AC_DEFINE_UNQUOTED([ssize_t], [$gl_def_ssize_t],
+                       [Define as a signed type of the same size as size_t.])
   fi
 ])