-# usleep.m4 serial 1
-dnl Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+# usleep.m4 serial 3
+dnl Copyright (C) 2009-2012 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 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
type if <sys/types.h> lacks this type.])])
if test $ac_cv_func_usleep = no; then
HAVE_USLEEP=0
- AC_LIBOBJ([usleep])
else
dnl POSIX allows implementations to reject arguments larger than
dnl 999999, but GNU guarantees it will work.
#include <unistd.h>
]], [[return !!usleep (1000000);]])],
[gl_cv_func_usleep_works=yes], [gl_cv_func_usleep_works=no],
- [gl_cv_func_usleep_works="guessing no"])])
- if test "$gl_cv_func_usleep_works" != yes; then
- REPLACE_USLEEP=1
- AC_LIBOBJ([usleep])
- 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
])