X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fsys_ioctl_h.m4;h=e0396de8509a114cb133747a29b9370412b5e526;hb=04606dd55fd8f1a122a21c4b4e09ab2a36498385;hp=5488039b6c8bb6f00daa77ea6324e7e9a3b69e41;hpb=0806b2e000515c8c9f32c5276df88936d3f890cb;p=gnulib.git

diff --git a/m4/sys_ioctl_h.m4 b/m4/sys_ioctl_h.m4
index 5488039b6..e0396de85 100644
--- a/m4/sys_ioctl_h.m4
+++ b/m4/sys_ioctl_h.m4
@@ -1,4 +1,4 @@
-# sys_ioctl_h.m4 serial 1
+# sys_ioctl_h.m4 serial 2
 dnl Copyright (C) 2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -19,10 +19,13 @@ AC_DEFUN([gl_SYS_IOCTL_H],
     dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
     AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
       [gl_cv_decl_ioctl_in_sys_ioctl_h],
-      [AC_CHECK_DECL([ioctl],
+      [dnl We cannot use AC_CHECK_DECL because it produces its own messages.
+       AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM(
+            [AC_INCLUDES_DEFAULT([#include <sys/ioctl.h>])],
+            [(void) ioctl;])],
          [gl_cv_decl_ioctl_in_sys_ioctl_h=yes],
-         [gl_cv_decl_ioctl_in_sys_ioctl_h=no],
-         [#include <sys/ioctl.h>])
+         [gl_cv_decl_ioctl_in_sys_ioctl_h=no])
       ])
     if test $gl_cv_decl_ioctl_in_sys_ioctl_h != yes; then
       SYS_IOCTL_H='sys/ioctl.h'