grpc1.45.2/third_party/protobuf/kokoro/release/protoc/macos/build.sh

#!/bin/bash

set -ex
CXXFLAGS_COMMON="-std=c++14 -DNDEBUG -mmacosx-version-min=10.9"

cd github/protobuf
./autogen.sh

mkdir build64 && cd build64
export CXXFLAGS="$CXXFLAGS_COMMON -m64"
../configure --disable-shared
make -j4
file src/protoc
otool -L src/protoc | grep dylib
cd ..