Uninstall oclint to ensure gcc can be brew upgraded
MODIFY
_travis/install.sh
_travis/install.sh
@@ -7,6 +7,9 @@ if [[ "$(uname -s)" == 'Darwin' ]]; then
sw_vers
brew update || brew update
+ # https://github.com/travis-ci/travis-ci/issues/8826
+ brew cask uninstall oclint
+
brew outdated openssl || brew upgrade openssl
brew install openssl@1.1

Uninstall oclint to ensure gcc can be brew upgraded (#1464)