ADD: added new version of protobuf

libs/protobuf/kokoro/macos/prepare_build_macos_rc

@@ -6,14 +6,38 @@ set -eux
 
 export HOMEBREW_PREFIX=$(brew --prefix)
 
+##
+# Remove any pre-existing protobuf installation.
+brew uninstall protobuf
+
+##
+# Select Xcode version
+
 ##
 # Select Xcode version
 export DEVELOPER_DIR=/Applications/Xcode_14.app/Contents/Developer
 sudo xcode-select -s "${DEVELOPER_DIR}"
 
 ##
-# Use Python 2 by default (for googletest)
-pyenv global 2.7.18
+# Select C/C++ compilers
+
+export CC=gcc
+export CXX=g++
+
+##
+# Install Python 2 by default
+
+eval "$(pyenv init -)"
+pyenv install -v -s 2.7.18 && pyenv global 2.7.18
+
+##
+# Install Tox
+
+if [[ "${KOKORO_INSTALL_TOX:-}" == "yes" ]] ; then
+  pyenv install -v -s 3.7.13
+  pyenv global 3.7.13
+  sudo python -m pip install --upgrade pip 'tox==3.27.1' tox-pyenv
+fi
 
 ##
 # Setup RVM
@@ -23,19 +47,3 @@ if [[ "${KOKORO_INSTALL_RVM:-}" == "yes" ]] ; then
     git config --global --add safe.directory $HOMEBREW_PREFIX/Library/Taps/homebrew/homebrew-services
     sudo chown -R $(whoami) $HOME/.rvm/
 fi
-
-# "Install" valgrind if it doesn't exist
-##
-if [ ! -x "$(command -v valgrind)" ]; then
-    echo "#! /bin/bash" > valgrind
-    chmod ug+x valgrind
-    sudo mv valgrind /usr/local/bin/valgrind
-fi
-
-##
-# Install Virtual Python Environment
-
-if [[ "${KOKORO_INSTALL_VENV:-}" == "yes" ]] ; then
-    python3 -m venv venv
-    source venv/bin/activate
-fi