If modified sources are personal, or never distributed outside an organization, there is no burden to release the source of a custom compiler. The main intents of the GPL are to ensure end user freedo

If modified sources are personal, or never
distributed outside an
organization, there is no burden to release the
source of a custom
compiler. The main intents of the GPL are to
ensure end user freedoms.
And the LGPL code to be usable, as given, in
closed run-time systems.
Iam not а lawyer.