From 21e16fbf18b62a36be886d7c15d1671d3971db66 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 24 May 2020 18:36:10 +0100
Subject: [PATCH] autoconf: Check for adns_if_monotonic and define
 USE_MONOTONIC

Nothing uses this yet.  Split out into its own commit for clarity.

This flag is not yet in any released version of adns but as adns
upstream I promise this is how it will be.  for my convenience I am
making secnet check for it ahead of its existence in public adns....

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 config.h.in  |  3 +++
 configure    | 37 +++++++++++++++++++++++++++++++++++++
 configure.ac |  8 ++++++++
 3 files changed, 48 insertions(+)

diff --git a/config.h.in b/config.h.in
index a99e83f..7455fb9 100644
--- a/config.h.in
+++ b/config.h.in
@@ -68,6 +68,9 @@
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
+/* Use CLOCK_MONOTONIC and adns_if_monotonic */
+#undef USE_MONOTONIC
+
 /* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
    significant byte first (like Motorola and SPARC, unlike Intel). */
 #if defined AC_APPLE_UNIVERSAL_BUILD
diff --git a/configure b/configure
index 152c8ed..7cf4421 100755
--- a/configure
+++ b/configure
@@ -4219,6 +4219,43 @@ else
 $as_echo "$as_me: WARNING: Disabling IPv6 support" >&2;}
 fi
 
+ac_fn_c_check_decl "$LINENO" "adns_if_monotonic" "ac_cv_have_decl_adns_if_monotonic" "
+          # include <sys/types.h>
+          # include <sys/stat.h>
+          # include <stdlib.h>
+          # include <stddef.h>
+          # include <string.h>
+          # include <inttypes.h>
+          # include <stdint.h>
+          # include <unistd.h>
+
+          # include <sys/types.h>
+          # include <sys/stat.h>
+          # include <stdlib.h>
+          # include <stddef.h>
+          # include <string.h>
+          # include <inttypes.h>
+          # include <stdint.h>
+          # include <unistd.h>
+
+
+#include <adns.h>
+
+"
+if test "x$ac_cv_have_decl_adns_if_monotonic" = xyes; then :
+
+
+$as_echo "#define USE_MONOTONIC 1" >>confdefs.h
+
+
+else
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Using non-monotonic clock, due to lack of adns_if_monotonic" >&5
+$as_echo "$as_me: WARNING: Using non-monotonic clock, due to lack of adns_if_monotonic" >&2;}
+
+fi
+
+
 
 
   _SUBDIRMK_MAKEFILES="$_SUBDIRMK_MAKEFILES common.make"
diff --git a/configure.ac b/configure.ac
index 471a6e7..53810e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -137,6 +137,14 @@ else
     AC_MSG_WARN([Disabling IPv6 support])
 fi
 
+AC_CHECK_DECL([adns_if_monotonic],[
+    AC_DEFINE([USE_MONOTONIC],[1],[Use CLOCK_MONOTONIC and adns_if_monotonic])
+],[
+    AC_MSG_WARN([Using non-monotonic clock, due to lack of adns_if_monotonic])
+],[AC_INCLUDES_DEFAULT
+#include <adns.h>
+])
+
 SUBDIRMK_MAKEFILES(common.make)
 
 AC_OUTPUT(,
-- 
2.30.2