[PATCH v2 1/8] configure: Don't define HAVE_CLOCK_GETTIME on macOS.

[Huw Davies]

Using clock_gettime() on macOS is problematical; see commit
27c71e09ad51ba6aa672a46379efd10b5959863f for an explanation.
Possible configure tests for this end up being quite ugly, so
avoiding it altogether seems simplest.

Signed-off-by: Huw Davies 
---
 configure.ac | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index ae8e85b356..31176b8bc5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2262,11 +2262,15 @@ AC_CHECK_FUNCS(\
 )

dnl Check for clock_gettime which may be in -lrt
-ac_save_LIBS=$LIBS
-AC_SEARCH_LIBS(clock_gettime, rt,
-               [AC_DEFINE(HAVE_CLOCK_GETTIME, 1, [Define to 1 if you have the `clock_gettime' function.])
+case $host_os in
+    darwin*|macosx*) ;;
+    *) ac_save_LIBS=$LIBS
+        AC_SEARCH_LIBS(clock_gettime, rt,
+            [AC_DEFINE(HAVE_CLOCK_GETTIME, 1, [Define to 1 if you have the `clock_gettime' function.])
                 test "$ac_res" = "none required" || AC_SUBST(RT_LIBS,"$ac_res")])
-LIBS=$ac_save_LIBS
+    LIBS=$ac_save_LIBS
+    ;;
+esac

dnl **** Check for OpenLDAP ***
 if test "x$with_ldap" != "xno"