Appveyor start from a fresh build tree each time. Jenkins keeps the build tree between jobs so if something went wrong once, it can stay forever.
we need to empty the Jenkins build workspace for 2.1 and try building a new version Tu see if it's better.
if not better, we need to check Jenkins build env.
Appveyor start from a fresh build tree each time. Jenkins keeps the build tree between jobs so if something went wrong once, it can stay forever.
we need to empty the Jenkins build workspace for 2.1 and try building a new version Tu see if it's better.
if not better, we need to check Jenkins build env.