While looking for the documention for the OMP_* trees I noticed that they were not documented at all in c-tree.texi where all other trees are documented.
-- Summary: [4.2 Regression] None of the OMP_* trees are documented in c-tree.texi Product: gcc Version: 4.2.0 Status: UNCONFIRMED Keywords: documentation Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26237