refinements to definition of TREE_READONLY ?

[Olivier Hainque]

Hi Richard,

Still looking into this issue.

Our current understanding is that our initial bug was indirectly
caused by the Ada front-end setting TREE_STATIC on a DECL_EXTERNAL
constant, which it shouldn't do.

The straightforward fix to that uncovered corner issues with the
way we set DECL_CONTEXT in some special cases.

Investigating further ...

Thanks for your constructive feedback,

Olivier