[Bug c++/4794] gcc hangs on small, simple code fragment

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

------- Additional Comments From steven at gcc dot gnu dot org  2003-12-01 22:53 -------
I'm not sure yet, but the bt is never really that long, and when I put a 
conditional breakpoint on has_cleanups with some tree pointer, I get a lot of 
breaks there.  Smells like a (series of) circular trees. 
 
I have fixed this kind of bug before in the tree inliner by using 
walk_tree_without_duplicates.  That may not be a possible solution in this 
case because walk_tree is in tree-inline.c and has_cleanups is in tree.c (yes, 
Of course walk_tree should go there too, and it is already done for tree-ssa).   
 
A possible fix for 3.4 is to mimic w_t_wo_d() here and use a hash table to 
mark trees that have already been visited.  Or perhaps has_cleanups can be 
moved to tree-inline and rewritten to work as a walk_tree callback function. 
 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=4794