1 files changed, 32 insertions, 0 deletions

diff --git a/gl/m4/off64_t.m4 b/gl/m4/off64_t.m4
new file mode 100644
index 00000000..963d53e9
--- /dev/null
+++ b/gl/m4/off64_t.m4
@@ -0,0 +1,32 @@
+# off64_t.m4
+# serial 1
+dnl Copyright (C) 2024-2025 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 Check whether <sys/types.h> defines the 'off64_t' type.
+dnl Set HAVE_OFF64_T.
+
+AC_DEFUN([gl_TYPE_OFF64_T],
+[
+  dnl Persuade glibc <sys/types.h>, <stdio.h>, <fcntl.h>, <unistd.h>, <aio.h>
+  dnl to define off64_t.
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_CACHE_CHECK([for off64_t], [gl_cv_off64_t],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <sys/types.h>]],
+          [[int x = sizeof (off64_t *) + sizeof (off64_t);
+            return !x;]])],
+       [gl_cv_off64_t=yes], [gl_cv_off64_t=no])])
+
+  if test $gl_cv_off64_t != no; then
+    HAVE_OFF64_T=1
+  else
+    HAVE_OFF64_T=0
+  fi
+  AC_SUBST([HAVE_OFF64_T])
+])