[Bug other/51662] New: Temporary objects gets garbage collected in cc1

["max at duempel dot org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51662

             Bug #: 51662
           Summary: Temporary objects gets garbage collected in cc1
    Classification: Unclassified
           Product: gcc
           Version: 4.6.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: max@duempel.org


Created attachment 26170
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26170
Workaround

After rebasing cegcc/mingw32ce on gcc 4.6.2, I found cc1 crashing.
locate_fn_flags() creates an object "ob" that is not yet inserted into the root
tree, and lookup_fnfields() eventually causes a garbage collection. This may
kill the page where "ob" lives in, causing a segmentation fault.

I found a kludge to work around it: I increase function_depth to inhibit
garbage collection. See attached patch.

Another idea would be to call lookup_fnfields() before allocating "ob", but
since I don't know the code base, I don't know if this is safe.

Also note that this may or may not be caused / triggered by cegcc specific
patches. Just in case you want to review these:
http://git.xcsoar.org/cgit/max/cegcc-gcc.git/log/?h=ice