From 5cf2d1acf87fa0ab18375534ca210f1cabf212b3 Mon Sep 17 00:00:00 2001
From: Pierre-Olivier Mercier <nemunaire@nemunai.re>
Date: Wed, 2 Aug 2017 23:16:43 +0200
Subject: [PATCH] Link with libatomic on architectures that requires it

---
 configure.ac    | 10 +++++++++-
 src/Makefile.am |  2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2a28214..5bd1798 100644
--- a/configure.ac
+++ b/configure.ac
@@ -504,8 +504,16 @@ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sched.h>]], [[cpuset_t* set = cpuset
 AC_COMPILE_IFELSE(
   [AC_LANG_PROGRAM([[#include <stdint.h>]],
                    [[uint64_t val = 0; __atomic_add_fetch(&val, 1, __ATOMIC_RELAXED);]])],
-  [AC_DEFINE(HAVE_ATOMIC, 1, [Define to 1 if you have '__atomic' functions.])]
+  [AC_DEFINE(HAVE_ATOMIC, 1, [Define to 1 if you have '__atomic' functions.])
+    AC_LINK_IFELSE(
+     [AC_LANG_PROGRAM([[#include <stdint.h>]],
+                      [[uint64_t val = 0; __atomic_add_fetch(&val, 1, __ATOMIC_RELAXED);]])],
+     [atomic_LIBS=""],
+     [atomic_LIBS="-latomic"]
+  )],
+  [atomic_LIBS=""]
 )
+AC_SUBST([atomic_LIBS])
 
 # Prepare CFLAG_VISIBILITY to be used where needed
 gl_VISIBILITY()
diff --git a/src/Makefile.am b/src/Makefile.am
index 948912e..bf28013 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -399,7 +399,7 @@ libknotd_la_CPPFLAGS = $(AM_CPPFLAGS) $(CFLAG_VISIBILITY) $(systemd_CFLAGS) \
                        $(liburcu_CFLAGS) -DKNOTD_MOD_STATIC
 libknotd_la_LDFLAGS  = $(AM_LDFLAGS) -export-symbols-regex '^knotd_'
 libknotd_la_LIBADD   = libknot.la zscanner/libzscanner.la $(systemd_LIBS) \
-                       $(liburcu_LIBS)
+                       $(liburcu_LIBS) $(atomic_LIBS)
 
 ###################
 # Knot DNS Daemon #
--- a/src/Makefile.in	2017-08-05 18:09:14.029882010 +0200
+++ b/src/Makefile.in	2017-08-05 18:12:43.541190937 +0200
@@ -379,7 +379,7 @@
 @STATIC_MODULE_dnstap_TRUE@	contrib/dnstap/libdnstap.la
 libknotd_la_DEPENDENCIES = libknot.la zscanner/libzscanner.la \
 	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1) \
-	$(am__DEPENDENCIES_2)
+	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_2)
 am__libknotd_la_SOURCES_DIST = knot/conf/base.c knot/conf/base.h \
 	knot/conf/conf.c knot/conf/conf.h knot/conf/confdb.c \
 	knot/conf/confdb.h knot/conf/confio.c knot/conf/confio.h \
@@ -937,6 +937,7 @@
 am__quote = @am__quote@
 am__tar = @am__tar@
 am__untar = @am__untar@
+atomic_LIBS = @atomic_LIBS@
 bindir = @bindir@
 build = @build@
 build_alias = @build_alias@
@@ -1275,7 +1276,8 @@
 	$(am__append_11)
 libknotd_la_LDFLAGS = $(AM_LDFLAGS) -export-symbols-regex '^knotd_'
 libknotd_la_LIBADD = libknot.la zscanner/libzscanner.la \
-	$(systemd_LIBS) $(liburcu_LIBS) $(am__append_12)
+	$(systemd_LIBS) $(liburcu_LIBS) $(atomic_LIBS) \
+	$(am__append_12)
 @HAVE_DAEMON_TRUE@sbin_SCRIPTS = utils/pykeymgr/pykeymgr
 @HAVE_DAEMON_TRUE@CLEAN_FILES = $(sbin_SCRIPTS)
 @HAVE_DAEMON_TRUE@knotddir = $(includedir)/knot
--- a/configure	2017-08-05 18:09:14.039882551 +0200
+++ b/configure	2017-08-05 18:12:18.779857706 +0200
@@ -655,6 +655,7 @@
 CODE_COVERAGE_ENABLED_TRUE
 HAVE_VISIBILITY
 CFLAG_VISIBILITY
+atomic_LIBS
 libidn_LIBS
 libidn_CFLAGS
 libidn2_LIBS
@@ -16347,10 +16358,32 @@
 
 $as_echo "#define HAVE_ATOMIC 1" >>confdefs.h
 
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdint.h>
+int
+main ()
+{
+uint64_t val = 0; __atomic_add_fetch(&val, 1, __ATOMIC_RELAXED);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  atomic_LIBS=""
+else
+  atomic_LIBS="-latomic"
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+else
+  atomic_LIBS=""
 
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
+
 # Prepare CFLAG_VISIBILITY to be used where needed