Clang is not a good example... It was adopted by Apple for its technical merits over gcc rather than its license. And, in fact, Apple tried to license clang/ll

Clang is not a good example... It was adopted by Apple for its technical merits over gcc rather than its license. And, in fact, Apple tried to license clang/llvm under the GPL as a contribution to gcc but was rejected: http://www.phoronix.com/scan.php?page=news_item&px=MTU4MzE http://www.phoronix.com/scan.php?page=news_item&px=MTU4MzE That clang is not GPL is more an accident of history than a preference of licenses: https://lists.gnu.org/archive/html/emacs-devel/2015-02/msg00594.html https://lists.gnu.org/archive/html/emacs-devel/2015-02/msg00...