configure.ac, rand/noise.c: Get high-res time from `clock_gettime'.

[catacomb] / configure.ac

diff --git a/configure.ac b/configure.ac
index c9107c5..3c8cb37 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -224,6 +224,13 @@ AC_SUBST([limits])
 dnl Functions used for noise-gathering.
 AC_CHECK_FUNCS([setgroups])
 AC_CHECK_HEADERS([linux/random.h])
+mdw_ORIG_LIBS=$LIBS LIBS=$CATACOMB_LIBS
+AC_SEARCH_LIBS([clock_gettime], [rt])
+CATACOMB_LIBS=$LIBS LIBS=$mdw_ORIG_LIBS
+if test $ac_cv_search_clock_gettime != no; then
+  AC_DEFINE([HAVE_CLOCK_GETTIME], [1],
+           [Define if you have the \`clock_gettime' function.])
+fi
 AC_CHECK_FUNCS([getentropy])
 AC_CACHE_CHECK([whether the freewheel noise generator will work],
        [catacomb_cv_freewheel],