optimization/10862: [tree-ssa] Segfault for (essentially) empty function

>Number:         10862
>Category:       optimization
>Synopsis:       [tree-ssa] Segfault for (essentially) empty function
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 19 14:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Wolfgang Bangerth
>Release:        unknown-1.0
>Organization:
>Environment:

>Description:
This one's rather funny (and was much simpler to reduce).
We ICE on a function that's essentially empty:
---------------------------------------template <int N> void foo () {
  int i;
  switch (i) {
    case 1:
          switch (N) {}
    default: ;
  }
}

template void foo<1> ();
---------------------------

g/x> /home/bangerth/bin/gcc-3.4-tree-ssa/bin/c++ -O2 -c a.cc
a.cc: In function `void foo() [with int N = 1]':
a.cc:10:   instantiated from here
a.cc:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

g/x> /home/bangerth/bin/gcc-3.4-tree-ssa/bin/c++ -v
Reading specs from /home/bangerth/bin/gcc-3.4-tree-ssa/lib/gcc-lib/i686-pc-linux-gnu/3.5-tree-ssa/specs
Configured with: ../gcc-3.4-CVS-tree-ssa/configure --enable-checking --enable-languages=c,c++,f77 --prefix=/home/bangerth/bin/gcc-3.4-tree-ssa
Thread model: posix
gcc version 3.5-tree-ssa 20030516 (merged 20030511)
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: