mozilla/rust — pull request #13905 by alexcrichton (2014-05-02 22:31:56+00:00)
Title: rustc: Remove the session building_library flag

This has long since not been too relevant since the introduction of many crate
type outputs. This commit removes the flag entirely, adjusting all logic to do
the most reasonable thing when building both a library and an executable.

Closes #13337