Build optimizations (#15381)

Signed-off-by: Tasos Katsoulas <tasos@netdata.cloud>

packaging/docker/Dockerfile

@@ -28,8 +28,8 @@ WORKDIR /opt/netdata.git
 RUN chmod +x netdata-installer.sh && \
    cp -rp /deps/* /usr/local/ && \
    /bin/echo -e "INSTALL_TYPE='oci'\nPREBUILT_ARCH='$(uname -m)'" > ./system/.install-type && \
-   CFLAGS="$(packaging/docker/gen-cflags.sh)" ./netdata-installer.sh --dont-wait --dont-start-it --use-system-protobuf \
-   ${EXTRA_INSTALL_OPTS} --one-time-build "$([ "$RELEASE_CHANNEL" = stable ] && echo --stable-channel)"
+   CFLAGS="$(packaging/docker/gen-cflags.sh)" LDFLAGS="-Wl,--gc-sections" ./netdata-installer.sh --dont-wait --dont-start-it --use-system-protobuf \
+   ${EXTRA_INSTALL_OPTS} --one-time-build --enable-lto "$([ "$RELEASE_CHANNEL" = stable ] && echo --stable-channel)"
 
 # files to one directory
 RUN mkdir -p /app/usr/sbin/ \

packaging/docker/gen-cflags.sh

@@ -3,7 +3,7 @@
 if [ -n "${CFLAGS}" ]; then
     echo "${CFLAGS}"
 elif [ -n "${DEBUG_BUILD}" ]; then
-    echo "-Og -ggdb -pipe"
+    echo "-ffunction-sections -fdata-sections -Og -ggdb -pipe"
 else
-    echo "-O2 -pipe"
+    echo "-ffunction-sections -fdata-sections -O2 -funroll-loops -pipe"
 fi

packaging/makeself/jobs/70-netdata-git.install.sh

@@ -7,12 +7,12 @@
 cd "${NETDATA_SOURCE_PATH}" || exit 1
 
 if [ "${NETDATA_BUILD_WITH_DEBUG}" -eq 0 ]; then
-  export CFLAGS="-static -O2 -I/openssl-static/include -I/libnetfilter-acct-static/include/libnetfilter_acct -I/usr/include/libmnl -pipe"
+  export CFLAGS="-ffunction-sections -fdata-sections -static -O2 -funroll-loops -I/openssl-static/include -I/libnetfilter-acct-static/include/libnetfilter_acct -I/usr/include/libmnl -pipe"
 else
   export CFLAGS="-static -O1 -pipe -ggdb -Wall -Wextra -Wformat-signedness -DNETDATA_INTERNAL_CHECKS=1 -I/openssl-static/include -I/libnetfilter-acct-static/include/libnetfilter_acct -I/usr/include/libmnl"
 fi
 
-export LDFLAGS="-static -L/openssl-static/lib -L/libnetfilter-acct-static/lib -lnetfilter_acct -L/usr/lib -lmnl"
+export LDFLAGS="-Wl,--gc-sections -static -L/openssl-static/lib -L/libnetfilter-acct-static/lib -lnetfilter_acct -L/usr/lib -lmnl"
 
 # We export this to 'yes', installer sets this to .environment.
 # The updater consumes this one, so that it can tell whether it should update a static install or a non-static one
@@ -34,7 +34,8 @@ run ./netdata-installer.sh \
   --require-cloud \
   --use-system-protobuf \
   --dont-scrub-cflags-even-though-it-may-break-things \
-  --one-time-build
+  --one-time-build \
+  --enable-lto
 
 # shellcheck disable=SC2015
 [ "${GITHUB_ACTIONS}" = "true" ] && echo "::group::Finishing netdata install" || true