Not able to build the executable binary in Ubuntu 20.04 for both gcc and clang

Hello, I am trying to build the http filter with envoy v1.16.0 . I tried using both **gcc** and **clang** but still no luck.

### GCC
My specs are as follows.

- bazel 3.4.1
- gcc 9.3.0
- gcc++ 9.3.0

When I try to build using the following commands,
```
git clone https://github.com/envoyproxy/envoy-filter-example.git
cd envoy-filter-example
git submodule update --init
cd envoy
git checkout v1.16.0
cd ..
bazel build //http-filter-example:envoy --config=clang
```
I get the following error.

```
ERROR: /home/khadija/.cache/bazel/_bazel_khadija/67b71b3527ed4854635b017e6b6cd642/external/com_googlesource_quiche/BUILD.bazel:2170:17: C++ compilation of rule '@com_googlesource_quiche//:quic_core_framer_lib' failed (Exit 1): gcc failed: error executing command
(cd /home/khadija/.cache/bazel/_bazel_khadija/67b71b3527ed4854635b017e6b6cd642/sandbox/linux-sandbox/2634/execroot/envoy_filter_example && \
exec env - \
BAZEL_LINKLIBS=-l%:libstdc++.a \
BAZEL_LINKOPTS=-lm \
CC=gcc \
CXX=g++ \
PATH=/home/khadija/.cache/bazelisk/downloads/bazelbuild/bazel-3.4.1-linux-x86_64/bin:/usr/lib/llvm-8/bin:/home/khadija/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/go/bin \
PWD=/proc/self/cwd \`

[-Werror=sign-compare]
5546 | static_cast(writer->remaining() - ecn_size) <
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
5547 | QuicDataWriter::GetVarInt62Len(gap) +
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5548 | QuicDataWriter::GetVarInt62Len(ack_range)) {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
At global scope:
cc1plus: error: unrecognized command line option '-Wno-range-loop-analysis' [-Werror]
cc1plus: all warnings being treated as errors
Target //:envoy failed to build
```
### Clang

I followed the instructions on bazel/ReadMe to download and configure Clang+llvm.
```
git clone https://github.com/envoyproxy/envoy-filter-example.git
cd envoy-filter-example
git submodule update --init
cd envoy
git checkout v1.16.0
bazel/setup_clang.sh ~/Downloads/clang+llvm-11.0.0-x86_64-linux-gnu-ubuntu-20.04
cd ..
bazel build //http-filter-example:envoy --config=clang
```
But I am getting the following error.

```
ERROR: /home/khadija/.cache/bazel/_bazel_khadija/b8963e6f21a84c9e75cda0cff04a3eb5/external/envoy/source/common/common/BUILD:321:23: C++ compilation of rule '@envoy//source/common/common:thread_impl_lib_posix' failed (Exit 1) gcc failed: error executing command /usr/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer '-std=c++0x' -MD -MF ... (remaining 70 argument(s) skipped)

Use --sandbox_debug to see verbose messages from the sandbox
gcc: error: unrecognized command line option '-fno-limit-debug-info'
gcc: error: unrecognized command line option '-Wgnu-conditional-omitted-operand'
gcc: error: unrecognized command line option '-Wc++2a-extensions'; did you mean '-fms-extensions'?
gcc: error: unrecognized command line option '-Wrange-loop-analysis'
Target //http-filter-example:envoy failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 0.718s, Critical Path: 0.40s
INFO: 0 processes.
FAILED: Build did NOT complete successfully
```
Any idea ? I was using envoy v1.14.0 and it works fine. But with v1.16.0, I can't build using both gcc and clang. Tried for few days and still no luck.