X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fusleep.m4;h=e430672dad045dcb177459c31ac29331ca254e97;hb=8209e72bf20d2b582384e91fde65df4f848a3a04;hp=3e96a1624b0fff91f8734ec624326a982175d083;hpb=269b74bfc8dac28d8a9c6c3e7232c2641433e073;p=gnulib.git

diff --git a/m4/usleep.m4 b/m4/usleep.m4
index 3e96a1624..e430672da 100644
--- a/m4/usleep.m4
+++ b/m4/usleep.m4
@@ -1,5 +1,5 @@
-# usleep.m4 serial 2
-dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
+# usleep.m4 serial 3
+dnl Copyright (C) 2009-2013 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.
@@ -12,6 +12,7 @@ AC_DEFUN([gl_FUNC_USLEEP],
   dnl usleep was required in POSIX 2001, but dropped as obsolete in
   dnl POSIX 2008; therefore, it is not always exposed in headers.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CHECK_FUNCS_ONCE([usleep])
   AC_CHECK_TYPE([useconds_t], [],
     [AC_DEFINE([useconds_t], [unsigned int], [Define to an unsigned 32-bit
@@ -27,9 +28,18 @@ AC_DEFUN([gl_FUNC_USLEEP],
 #include <unistd.h>
 ]], [[return !!usleep (1000000);]])],
         [gl_cv_func_usleep_works=yes], [gl_cv_func_usleep_works=no],
-        [gl_cv_func_usleep_works="guessing no"])])
-    if test "$gl_cv_func_usleep_works" != yes; then
-      REPLACE_USLEEP=1
-    fi
+        [case "$host_os" in
+                   # Guess yes on glibc systems.
+           *-gnu*) gl_cv_func_usleep_works="guessing yes" ;;
+                   # If we don't know, assume the worst.
+           *)      gl_cv_func_usleep_works="guessing no" ;;
+         esac
+        ])])
+    case "$gl_cv_func_usleep_works" in
+      *yes) ;;
+      *)
+        REPLACE_USLEEP=1
+        ;;
+    esac
   fi
 ])