By default the
initialize code is not executed when importing .olean files.
When this flag is set to
true, the initializers are executed.
This method is meant to be used by the Lean frontend only.
Remark: it is not safe to run
initialize code when using multiple threads.
Remark: Any loaded native Lean code must match its imported version. In particular,
no two versions of the same module may be loaded when this flag is set.
No native code may be loaded after its module has been imported.
Remark: Compacted module regions must not be freed when using this flag as the
cached initializer results may reference objects in them.
Remark: The Lean frontend executes this method at startup time.
x with "importing" flag turned on.
When the "importing" flag is set to true, we allow user-extensions defined with with
initialize command to update global references.
IMPORTANT: There is no semaphore controlling the access to these global references.
We assume these global references are updated by a single execution thread.
This is true in the Lean frontend where we process the
import commands at the beginning
of the execution only. Users must make sure that
importModules is used, there is only
one execution thread accessing the global references.