Add support for RISC-V (riscv64)

Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>

tbb.spec

@@ -8,7 +8,7 @@
 Name:    tbb
 Summary: The Threading Building Blocks library abstracts low-level threading details
 Version: %{upver}%{?uprel:.%{uprel}}
-Release: 2%{?dist}
+Release: 2.0.riscv64%{?dist}
 License: ASL 2.0
 Group:   Development/Tools
 URL:     http://threadingbuildingblocks.org/
@@ -133,7 +133,11 @@ mv build.orig build
 
 make %{?_smp_mflags} tbb_build_prefix=obj stdver=c++14 \
   CXXFLAGS="$RPM_OPT_FLAGS" \
+%ifnarch riscv64
   LDFLAGS="-Wl,--as-needed $RPM_LD_FLAGS"
+%else
+  LDFLAGS="-Wl,--as-needed -latomic $RPM_LD_FLAGS"
+%endif
 for file in %{SOURCE6} %{SOURCE7} %{SOURCE8}; do
     base=$(basename ${file})
     sed 's/_FEDORA_VERSION/%{version}/' ${file} > ${base}
@@ -146,7 +150,11 @@ pushd python
 make %{?_smp_mflags} -C rml stdver=c++14 \
   CPLUS_FLAGS="%{optflags} -DDO_ITT_NOTIFY -DUSE_PTHREAD" \
   PIC_KEY="-fPIC -Wl,--as-needed" \
+%ifnarch riscv64
   LDFLAGS="$RPM_LD_FLAGS"
+%else
+  LDFLAGS="-latomic $RPM_LD_FLAGS"
+%endif
 cp -p rml/libirml.so* .
 %py2_build
 popd
@@ -157,7 +165,11 @@ pushd python3
 make %{?_smp_mflags} -C rml stdver=c++14 \
   CPLUS_FLAGS="%{optflags} -DDO_ITT_NOTIFY -DUSE_PTHREAD" \
   PIC_KEY="-fPIC -Wl,--as-needed" \
+%ifnarch riscv64
   LDFLAGS="$RPM_LD_FLAGS"
+%else
+  LDFLAGS="-latomic $RPM_LD_FLAGS"
+%endif
 cp -p rml/libirml.so* .
 %py3_build
 popd
@@ -264,6 +276,9 @@ rm $RPM_BUILD_ROOT%{_libdir}/cmake/%{name}/README.rst
 %endif
 
 %changelog
+* Mon Aug 27 2018 David Abdurachmanov <david.abdurachmanov@gmail.com> - 2018.5-2.0.riscv64
+- Add support for RISC-V (riscv64)
+
 * Sat Jul 14 2018 Fedora Release Engineering <releng@fedoraproject.org> - 2018.5-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild