In case anyone cares....
The gcc version shipped with NetBSD 4.0.1 ("gcc version 4.1.2 20061021
prerelease (NetBSD nb3 20061125)") has a doc/gty.texi that is rather
incomplete. Specifically, it lists three things that must be marked
for the garbage collector, with wording that implies the list is
exhaustive:
All @code{struct} and @code{union} declarations that define
data structures that are allocated under control of the garbage
collector must be marked. All global variables that hold
pointers to garbage-collected memory must also be marked.
Finally, all global variables that need to be saved and
restored by a precompiled header must be marked.
However, this is incomplete. I added a field to c_parser
c_lcs *lcs
but did not mark anything new with GTY because c_lcs is not a
garbage-collected type. (Whether or not this is a good design for my
purposes is irrelevant here.)
But then, upon trying to build the resulting source, gengtype fell
over, complaining "unidentified type `c_lcs'". Obviously, there is
something else that needs marking somehow, beyond the things listed,
but it is not clear what, nor what the correct marking is. (It's
possible that the problem is that GCed memory may not contain pointers
to non-GCed memory, but if so that needs to be clearly specified; if
it's there now, I couldn't find it. The closest I could find was a
statement that "[t]he type machinery expects all pointers to point to
the start of an object", which the pointer I added does.)
It's possible this is NetBSD damage; their import has damaged the gcc
tree in at least one known way (BUGS has disappeared), but it seems
unlikely to me that they'd ship the doc file for a different version
from the source. I don't see anything akin to source-code control IDs
in the files, so I'm not sure how to most usefully identify the exact
versions of individual files; if you believe this is NetBSD damage, let
me know and I'll file a NetBSD bug report for it, and if you can think
of a good way for me to identify the particular file version in
question, let me know that too and I can.
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