Patch boost::function to fix strict aliasing problem (#1422456)

Per packaging guidelines don't clean buildroot in %%install and %%clean.

boost-1.63.0-function-may-alias.patch

@@ -0,0 +1,11 @@
+--- boost_1_63_0/boost/function/function_template.hpp.alias	2017-03-24 12:17:21.560125198 +0000
++++ boost_1_63_0/boost/function/function_template.hpp	2017-03-24 13:07:24.971891166 +0000
+@@ -994,7 +994,7 @@
+         if (!f.empty()) {
+           this->vtable = f.vtable;
+           if (this->has_trivial_copy_and_destroy())
+-            this->functor = f.functor;
++            __builtin_memcpy(&this->functor, &f.functor, sizeof(f.functor));
+           else
+             get_vtable()->base.manager(f.functor, this->functor,
+                                      boost::detail::function::move_functor_tag);

boost.spec

@@ -35,7 +35,7 @@ Name: boost
 Summary: The free peer-reviewed portable C++ source libraries
 Version: 1.63.0
 %global version_enc 1_63_0
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: Boost and MIT and Python
 
 %global toplev_dirname %{name}_%{version_enc}
@@ -130,6 +130,8 @@ Patch82: boost-1.60.0-no-rpath.patch
 # https://github.com/boostorg/build/issues/163
 Patch83: boost-1.63.0-dual-python-build.patch
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=1422456
+Patch84: boost-1.63.0-function-may-alias.patch
 
 %bcond_with tests
 %bcond_with docs_generated
@@ -651,6 +653,7 @@ a number of significant features and is now developed independently
 %patch68 -p1
 %patch82 -p0
 %patch83 -p1
+%patch84 -p1
 
 # At least python2_version needs to be a macro so that it's visible in
 # %%install as well.
@@ -764,7 +767,6 @@ echo ============================= build Boost.Build ==================
 
 
 %install
-rm -rf $RPM_BUILD_ROOT
 cd %{_builddir}/%{toplev_dirname}
 
 %if %{with openmpi} || %{with mpich}
@@ -914,9 +916,6 @@ rm -f tmp-doc-files-to-be-installed
 rm -f tmp-doc-directories
 %{__install} -p -m 644 -t $EXAMPLESPATH LICENSE_1_0.txt
 
-%clean
-rm -rf $RPM_BUILD_ROOT
-
 
 # MPI subpackages don't need the ldconfig magic.  They are hidden by
 # default, in MPI back-end-specific directory, and only show to the
@@ -1296,6 +1295,10 @@ fi
 %{_mandir}/man1/bjam.1*
 
 %changelog
+* Wed Apr 05 2017 Jonathan Wakely <jwakely@redhat.com> - 1.63.0-6
+- Patch boost::function to fix strict aliasing problem (#1422456)
+- Per packaging guidelines don't clean buildroot in %%install and %%clean.
+
 * Sun Mar 12 2017 Peter Robinson <pbrobinson@fedoraproject.org> 1.63.0-5
 - Enable OpenMPI/mpich on ppc64le and s390x now they have support