Use -DNDEBUG in non-debug builds to suppress debug warnings. Add gmock.

chromeos-base/metrics/metrics-0.0.1.ebuild

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=2
 
-inherit toolchain-funcs
+inherit flag-o-matic toolchain-funcs
 
 DESCRIPTION="Chrome OS Metrics Collection Utilities"
 HOMEPAGE="http://src.chromium.org"
 SRC_URI=""
 LICENSE="BSD"
 SLOT="0"
 KEYWORDS="amd64 x86 arm"
-IUSE=""
+IUSE="debug"
 
 # TODO(petkov): Remove dependences on metrics_collection and metrics_daemon
 # and the empty ebuilds once the build dust settles.
 RDEPEND="chromeos-base/chromeos-metrics_collection
         chromeos-base/chromeos-metrics_daemon
         chromeos-base/libchrome
+        dev-cpp/gflags
         >=dev-libs/glib-2.0
         dev-libs/dbus-glib
-        sys-apps/dbus"
+        sys-apps/dbus
+        "
 
-DEPEND="dev-cpp/gflags
+DEPEND="${RDEPEND}
+        dev-cpp/gmock
         dev-cpp/gtest
-        ${RDEPEND}"
+        "
 
 src_unpack() {
         local metrics="${CHROMEOS_ROOT}/src/platform/metrics"
         elog "Using metrics sources: $metrics"
         cp -ar "${metrics}" "${S}" || die
 }
 
 src_compile() {
+        use debug || append-flags -DNDEBUG
         tc-export CXX AR PKG_CONFIG
         emake || die "metrics compile failed."
 }
 
 src_test() {
         tc-export CXX AR PKG_CONFIG
         emake tests || die "could not build tests"
         if ! use x86; then
                 echo Skipping unit tests on non-x86 platform
         else
                 for test in ./*_test; do
                         "${test}" ${GTEST_ARGS} || die "${test} failed"
                 done
         fi
 }
 
 src_install() {
         dodir /usr/bin
         dodir /usr/include
         dodir /usr/lib
         dodir /usr/sbin
         emake DESTDIR="${D}" install || die "metrics install failed."
         chmod 0555 "${D}/usr/sbin/omaha_tracker.sh"
 }