[Bug c++/16273] Virtual memory exhausted in C++ even w/out any optimization

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

------- Additional Comments From reichelt at gcc dot gnu dot org  2004-06-30 13:48 -------
Created an attachment (id=6664)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6664&action=view)
Smaller example

After some reduction I came up with the attached example.
And now I'm convinced that this is really just a memory-hog.
Just have a look at the memory usage and compilation times:

gcc 2.95.3:    15MB    2.87s
gcc 3.0:      segfault
gcc 3.0.4:    ICE in build_secondary_vtable, at cp/class.c
gcc 3.1:       82MB   11.17s
gcc 3.2.3:     82MB   11.22s
gcc 3.3:      334MB   72.07s
gcc 3.3.4:    334MB   70.58s
gcc 3.4.0:    554MB   10.52s
3.4 branch:   554MB   10.52s
head:	      654MB   10.16s
lno branch:   655MB   10.45s

This is an increase in memory usage by a factor of 44 sinc gcc 2.95.3 !!!!
It's no surprise that this goes beyond 2GB with a larger example. :-(
Adding "-fsyntax-only" on the command-line doesn't help.

Btw, the reduced example is all about nested classes, inheritance and
virtual functions. It compiles without errors since gcc 2.95.3 (with
the exception that the 3.0 branch crashes). I got rid of all static
member funtions and most (if not all) function definitions (as opposed
to declarations).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16273