Revert "Don't warn on unused function"

This reverts commit b05d0ab9.

docker/Dockerfile.build.rhel8.2

@@ -35,4 +35,4 @@ COPY . .
 RUN /bin/sh oaienv && \ 
     cd cmake_targets && \
     mkdir -p log && \
-    ./build_oai --eNB --gNB --RU --UE --nrUE --ninja --build-lib "telnetsrv enbscope uescope nrscope" -w USRP --verbose-ci --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Wno-unused-function --cmake-opt -DCMAKE_CXX_FLAGS=-Wno-unused-function
+    ./build_oai --eNB --gNB --RU --UE --nrUE --ninja --build-lib "telnetsrv enbscope uescope nrscope" -w USRP --verbose-ci --noavx512 -c

docker/Dockerfile.build.ubuntu20

@@ -35,4 +35,4 @@ COPY . .
 RUN /bin/sh oaienv && \
     cd cmake_targets && \
     mkdir -p log && \
-    ./build_oai --eNB --gNB --RU --UE --nrUE --ninja --build-lib "telnetsrv enbscope uescope nrscope nrqtscope" -w USRP --verbose-ci --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror --cmake-opt -DCMAKE_C_FLAGS=-Wno-unused-function --cmake-opt -DCMAKE_CXX_FLAGS=-Wno-unused-function
+    ./build_oai --eNB --gNB --RU --UE --nrUE --ninja --build-lib "telnetsrv enbscope uescope nrscope nrqtscope" -w USRP --verbose-ci --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror

docker/Dockerfile.clang.rhel8.2

@@ -40,4 +40,4 @@ RUN /bin/sh oaienv && \
     mkdir -p log && \
     export CC=/usr/bin/clang && \
     export CXX=/usr/bin/clang++ && \
-    ./build_oai --phy_simulators --gNB --eNB --nrUE --UE --ninja --verbose-ci --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror --cmake-opt -DCMAKE_C_FLAGS=-Wno-unused-function --cmake-opt -DCMAKE_CXX_FLAGS=-Wno-unused-function
+    ./build_oai --phy_simulators --gNB --eNB --nrUE --UE --ninja --verbose-ci --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror

docker/Dockerfile.phySim.rhel8.2

@@ -38,7 +38,7 @@ RUN yum install -y libasan libubsan
 RUN /bin/sh oaienv && \ 
     cd cmake_targets && \
     mkdir -p log && \
-    ./build_oai --phy_simulators --ninja --verbose-ci --sanitize --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror --cmake-opt -DCMAKE_C_FLAGS=-Wno-unused-function --cmake-opt -DCMAKE_CXX_FLAGS=-Wno-unused-function
+    ./build_oai --phy_simulators --ninja --verbose-ci --sanitize --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror
 
 #start from scratch for target executable
 FROM registry.access.redhat.com/ubi8/ubi:latest as oai-physim