AC_SYS_YEAR2038_REQUIRED: Fix configure failure with MSVC.

* lib/autoconf/specific.m4 (_AC_SYS_LARGEFILE_PROBE): Distinguish the results
"support not detected" and "supported through gnulib". If the result is
"supported through gnulib", don't fail.

diff --git a/lib/autoconf/specific.m4 b/lib/autoconf/specific.m4
index 3bf1a0ed14a14b9cbb9d0920d93e4563d72c6a31..f411695fe47547b59c985e9276c8a66f76521089 100644 (file)
--- a/lib/autoconf/specific.m4
+++ b/lib/autoconf/specific.m4
@@ -323,11 +323,24 @@ AC_DEFUN([_AC_SYS_LARGEFILE_PROBE],
     test $ac_opt_found = no || break
   done
   CC="$ac_save_CC"
+  dnl Gnulib implements large file support for native Windows, based on the
+  dnl variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE.
+  m4_ifdef([gl_LARGEFILE], [
+    AC_REQUIRE([AC_CANONICAL_HOST])
+    if test $ac_opt_found != yes; then
+      AS_CASE([$host_os],
+        [mingw*],
+          [ac_cv_sys_largefile_opts="supported through gnulib"
+           ac_opt_found=yes]
+      )
+    fi
+  ])
   test $ac_opt_found = yes || ac_cv_sys_largefile_opts="support not detected"])
 
 ac_have_largefile=yes
 AS_CASE([$ac_cv_sys_largefile_opts],
   ["none needed"], [],
+  ["supported through gnulib"], [],
   ["support not detected"],
     [ac_have_largefile=no
      AS_IF([test $ac_largefile_required,$ac_year2038_required != no,no],