Add support for Boost.Chrono.

Signed-off-by: Benoit Sigoure <[email protected]>

Author: pwaller

README

@@ -131,6 +131,7 @@ runtime or not, etc.  The macro will try to find a library that matches your
 requirements but may fall back to another flavor of the library if the one you
 asked for isn't available.
 The following libraries are supported:
+  - Chrono
   - Date_Time
   - Filesystem
   - Graph

THANKS

@@ -16,6 +16,7 @@ Jens Seidel
 Jeremy Powell
 Nathan Phillip Brink
 Paul Balomiri
+Peter Waller
 Rhys Ulerich
 Staffan Gimåker
 Sven Hesse

build-aux/boost.m4

@@ -480,6 +480,33 @@ BOOST_DEFUN([Bind],
 [BOOST_FIND_HEADER([boost/bind.hpp])])
 
 
+# BOOST_CHRONO()
+# ------------------
+# Look for Boost.Chrono
+BOOST_DEFUN([Chrono],
+[# Do we have to check for Boost.System?  This link-time dependency was
+# added as of 1.35.0.  If we have a version <1.35, we must not attempt to
+# find Boost.System as it didn't exist by then.
+if test $boost_major_version -ge 135; then
+BOOST_SYSTEM([$1])
+fi # end of the Boost.System check.
+boost_filesystem_save_LIBS=$LIBS
+boost_filesystem_save_LDFLAGS=$LDFLAGS
+m4_pattern_allow([^BOOST_SYSTEM_(LIBS|LDFLAGS)$])dnl
+LIBS="$LIBS $BOOST_SYSTEM_LIBS"
+LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
+BOOST_FIND_LIB([chrono], [$1],
+                [boost/chrono.hpp],
+                [boost::chrono::thread_clock d;])
+if test $enable_static_boost = yes && test $boost_major_version -ge 135; then
+    AC_SUBST([BOOST_FILESYSTEM_LIBS], ["$BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"])
+fi
+LIBS=$boost_filesystem_save_LIBS
+LDFLAGS=$boost_filesystem_save_LDFLAGS               
+                
+])# BOOST_CHRONO
+
+
 # BOOST_CONVERSION()
 # ------------------
 # Look for Boost.Conversion (cast / lexical_cast)