[patch] Use --enable-libstdcxx-time=yes on DragonFly BSD

[Jonathan Wakely]

It has just occurred to me we might want to make this change for GCC5:


diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 1727140..0b8c0f0 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -1219,11 +1219,11 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
          ac_has_clock_realtime=yes
        fi
        ac_has_nanosleep=yes
        ac_has_sched_yield=yes
        ;;
-      freebsd*|netbsd*)
+      freebsd*|netbsd*|dragonfly*)
        ac_has_clock_monotonic=yes
        ac_has_clock_realtime=yes
        ac_has_nanosleep=yes
        ac_has_sched_yield=yes
        ;;


We could make this change post-GCC5 but as the dragonfly target is new
for GCC5 it would be a shame to release it with a sub-optimal
resolution for clocks and thread sleeping.

John, assuming I'm right that dragonfly supports all these features,
could you test this change?  (You'll need the same change on line
19555 of the libstdc++-v3/configure script.)