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diff --git a/buildconf/release.ninja b/buildconf/release.ninja
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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+third_party_cflags = -Werror=format -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -fstack-protector-strong -ffunction-sections -fdata-sections -flto
+
+# Don't set -Werror in general; we don't want to risk future warnings appearing
+# in GCC's -Wall/-Wextra and breaking the build.
+#
+# Most of these flags come from Debian's dpkg-buildflags, with the exception
+# that we aim for correctness with -O3, rather than just -O2.
+cxxflags = -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -DGLPLANET_DISABLE_EGL_THREAD_SAFETY_CHECKS -DGLPLANET_DISABLE_GL_THREAD_SAFETY_CHECKS -DGLPLANET_DISABLE_AGGRESSIVE_ERROR_CHECKING -fstack-protector-strong -ffunction-sections -fdata-sections
+#-flto
+third_party_cxxflags = -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -fstack-protector-strong -ffunction-sections -fdata-sections
+#-flto
+
+ldflags = -flto -Wl,-O2 -Wl,-z,relro -Wl,--gc-sections -Wl,--as-needed
+
+subninja buildconf/common.ninja