Fix s390x compilation issue by changing -O2 to -O1 (rh#1675243)

kyotocabinet.spec

@@ -1,7 +1,7 @@
 Summary:        A straightforward implementation of DBM
 Name:           kyotocabinet
 Version:        1.2.76
-Release:        19%{?dist}
+Release:        20%{?dist}
 License:        GPLv3
 URL:            http://fallabs.com/%{name}/
 Source:         http://fallabs.com/%{name}/pkg/%{name}-%{version}.tar.gz
@@ -55,6 +55,12 @@ applications that use Kyoto Cabinet.
 %patch2 -p1 -b .gcc6
 
 %build
+%ifarch s390x
+RPM_OPT_FLAGS=$(echo $RPM_OPT_FLAGS | sed -e 's/-O2 /-O1 /g')
+%endif
+export CFLAGS=$RPM_OPT_FLAGS
+
+
 %configure --disable-opt --enable-lzo --enable-lzma
 make %{?_smp_mflags}
 
@@ -142,6 +148,9 @@ make check
 %doc COPYING doc/api/* kyotocabinet.idl
 
 %changelog
+* Wed Feb 27 2019 Parag Nemade <pnemade AT redhat DOT com> - 1.2.76-20
+- Fix s390x compilation issue by changing -O2 to -O1 (rh#1675243)
+
 * Fri Feb 01 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.2.76-19
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild