https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104669
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
These push_local_extern_decl_alias created aliases are an endless source of
problems :(.
What happens is we create foo as a FUNCTION_DECL local to the function, then
push_local_extern_decl_alias creates another FUNCTION_DECL for it.
Then duplicate_decls is called on the local decl and another new local decl,
during that duplicate_decls e.g. DECL_ATTRIBUTES and other flags on the local
FUNCTION_DECL are tweaked, but doesn't update DECL_ATTRIBUTES etc. on the
extern alias.
The only spot in duplicate_decls that deals with this is:
if (VAR_OR_FUNCTION_DECL_P (newdecl) && DECL_LOCAL_DECL_P (newdecl))
{
if (!DECL_LOCAL_DECL_P (olddecl))
/* This can happen if olddecl was brought in from the
enclosing namespace via a using-decl. The new decl is
then not a block-scope extern at all. */
DECL_LOCAL_DECL_P (newdecl) = false;
else
{
retrofit_lang_decl (newdecl);
DECL_LOCAL_DECL_ALIAS (newdecl) = DECL_LOCAL_DECL_ALIAS (olddecl);
}
}
So, how do we synchronize changes from the local FUNCTION_DECL to
DECL_LOCAL_DECL_ALIAS when they are made?
