add workaround for "virtual memory exhausted: Cannot allocate memory" on s390

plasma-desktop.spec

@@ -4,7 +4,7 @@
 Name:    plasma-desktop
 Summary: Plasma Desktop shell
 Version: 5.5.0
-Release: 5%{?dist}
+Release: 6%{?dist}
 
 License: GPLv2+ and (GPLv2 or GPLv3)
 URL:     https://projects.kde.org/projects/kde/workspace/plasma-desktop
@@ -176,6 +176,11 @@ BuildArch: noarch
 
 
 %build
+%ifarch s390 %{arm}
+# Decrease debuginfo verbosity to reduce memory consumption even more
+%global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
+%endif
+
 mkdir %{_target_platform}
 pushd %{_target_platform}
 %{cmake_kf5} ..
@@ -316,6 +321,10 @@ fi
 
 
 %changelog
+* Wed Dec 16 2015 Than Ngo <than@redhat.com> - 5.5.0-6
+- add workaround for "virtual memory exhausted: Cannot allocate memory"
+  on s390
+
 * Tue Dec 15 2015 Than Ngo <than@redhat.com> - 5.5.0-5
 - fix build failure on s390/s390x