+2012-05-05 Bruno Haible <bruno@clisp.org>
+
+ nanosleep: Avoid guessing wrong when cross-compiling to Linux.
+ * m4/nanosleep.m4 (gl_FUNC_NANOSLEEP): Require AC_CANONICAL_HOST. When
+ cross-compiling, set gl_cv_func_nanosleep to either 'guessing no'
+ or 'guessing no (mishandles large arguments)'.
+
2012-05-05 Bruno Haible <bruno@clisp.org>
link-follow: Avoid guessing wrong when cross-compiling to glibc/Linux.
-# serial 34
+# serial 35
dnl From Jim Meyering.
dnl Check for the nanosleep function.
AC_DEFUN([gl_FUNC_NANOSLEEP],
[
+ AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+
dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
AC_CHECK_HEADERS_ONCE([sys/time.h])
AC_REQUIRE([gl_FUNC_SELECT])
static struct timespec ts_sleep;
static struct timespec ts_remaining;
static struct sigaction act;
+ /* Test for major problems first. */
if (! nanosleep)
return 2;
act.sa_handler = check_for_SIGALRM;
alarm (1);
if (nanosleep (&ts_sleep, NULL) != 0)
return 3;
+ /* Test for a minor problem: the handling of large arguments. */
ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
ts_sleep.tv_nsec = 999999999;
alarm (1);
4|5|6) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
*) gl_cv_func_nanosleep=no;;
esac],
- [gl_cv_func_nanosleep=cross-compiling])
+ [case "$host_os" in dnl ((
+ linux*) # Guess it halfway works on when the kernel is Linux.
+ gl_cv_func_nanosleep='guessing no (mishandles large arguments)' ;;
+ *) # If we don't know, assume the worst.
+ gl_cv_func_nanosleep='guessing no' ;;
+ esac
+ ])
])
- if test "$gl_cv_func_nanosleep" = yes; then
- REPLACE_NANOSLEEP=0
- else
- REPLACE_NANOSLEEP=1
- if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
- AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
- [Define to 1 if nanosleep mishandles large arguments.])
- else
- for ac_lib in $LIBSOCKET; do
- case " $LIB_NANOSLEEP " in
- *" $ac_lib "*) ;;
- *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
- esac
- done
- fi
- fi
+ case "$gl_cv_func_nanosleep" in
+ *yes)
+ REPLACE_NANOSLEEP=0
+ ;;
+ *)
+ REPLACE_NANOSLEEP=1
+ case "$gl_cv_func_nanosleep" in
+ *"mishandles large arguments"*)
+ AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
+ [Define to 1 if nanosleep mishandles large arguments.])
+ ;;
+ *)
+ # The replacement uses select(). Add $LIBSOCKET to $LIB_NANOSLEEP.
+ for ac_lib in $LIBSOCKET; do
+ case " $LIB_NANOSLEEP " in
+ *" $ac_lib "*) ;;
+ *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
+ esac
+ done
+ ;;
+ esac
+ ;;
+ esac
else
HAVE_NANOSLEEP=0
fi