Fix incompatible libary version for gem with native extensions

Sep 3 2021

Recently, I run into an issue when running bundle exec, then somehow the command breaks with the below error:

An error occurred while loading spec_helper. - Did you mean?
                    rspec ./spec/spec_helper.rb

Failure/Error: require_relative '../config/environment'

LoadError:
  incompatible library version - /Users/hieunguyen/code/guardhouse/vendor/bundle/ruby/3.0.0/gems/byebug-11.1.3/lib/byebug/byebug.bundle

Searching through the internet, the issue happens because Clang enables -Werror=implicit-function-declaration by default. We need to disable it when building gem using -Wno-error=implicit-function-declaration option. For example, to apply for pg gem:

bundle config build.pg --with-cflags="-Wno-error=implicit-function-declaration"