From 460b32d7b1a2014dd490b15a360d062847f8efe9 Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Mon, 21 Jul 2014 17:34:08 -0400
Subject: [PATCH] build: fix broken boost chrono check on some platforms

If clock_gettime is implemented outside of libc (librt in this case), configure
would fail when testing boost. Since clock_gettime is not present on all OSs,
boost only uses it when it can. Check for it in librt and add it to LIBS if
found, but don't fail if it's not (since boost won't be expecting it in this
case).

Also, reverse the link order as necessary for static libs.

Note that it's possible that there are other similar cases for boost, which may
be handled the same way.
---
 configure.ac | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index cedc34e52..719b06da6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -392,6 +392,8 @@ AC_TRY_COMPILE([#include <sys/socket.h>],
  [ AC_MSG_RESULT(no)]
 )
 
+AC_SEARCH_LIBS([clock_gettime],[rt])
+
 LEVELDB_CPPFLAGS=
 LIBLEVELDB=
 LIBMEMENV=
@@ -460,11 +462,8 @@ dnl after 1.56.
 dnl If neither is available, abort.
 dnl If sleep_for is used, boost_chrono becomes a requirement.
 if test x$ax_cv_boost_chrono = xyes; then
-dnl Allow passing extra needed dependency libraries for boost-chrono from static gitian build
-BOOST_CHRONO_LIB="$BOOST_CHRONO_LIB $BOOST_CHRONO_EXTRALIBS"
-
 TEMP_LIBS="$LIBS"
-LIBS="$LIBS $BOOST_LIBS $BOOST_CHRONO_LIB"
+LIBS="$BOOST_LIBS $BOOST_CHRONO_LIB $LIBS"
 TEMP_CPPFLAGS="$CPPFLAGS"
 CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
 AC_TRY_LINK([
@@ -486,7 +485,7 @@ fi
 
 if test x$boost_sleep != xyes; then
 TEMP_LIBS="$LIBS"
-LIBS="$LIBS $BOOST_LIBS"
+LIBS="$BOOST_LIBS $LIBS"
 TEMP_CPPFLAGS="$CPPFLAGS"
 CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
 AC_TRY_LINK([