Re: c++/10661: [3.3/3.4? regression] ICE in instantiate_decl

[bangerth at dealii dot org]

Old Synopsis: Regression vs. 3.1: ICE on legal code
New Synopsis: [3.3/3.4? regression] ICE in instantiate_decl

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Thu May  8 14:19:06 2003
State-Changed-Why:
    Ewgenij,
    let me start out with two remarks:
    - your chances that someone takes care of this might be
      higher, if you don't start out whining about the state
      of 3.3 a few days before the release and then send us
      a bulk of 80,000 lines of template metaprogramming. This
      is the most tangled, complicated, unintelligible, evil
      code I have ever seen. I spent about 3 hours yesterday
      night reducing it to 46,000 lines, but it's very hard
      to reduce it and it would have been significantly easier
      had you sent in a _reduced_ testcase.
    
    - I managed to extract about a dozen other testcases that
      failed somewhere in the compiler while reducing the big
      chunk. I imagine, you must have seen things like that as
      well while developing. If you get something like that,
      please wend them in, preferrably, as said, as _small_
      code snippets.
    
      Since the code is so incredibly complex, it might be
      worthwhile to make it a testcase. So if you want and
      can, I think it would be appreciated if you would set
      up a system that updates gcc from CVS source every once
      in a while (day, week) and runs it against your code. 
      This way, you may be able to find bugs in gcc earlier
      than right before the release. The bug you reported will
      certainly not be fixed for 3.3.0.
    
    That being said:
    - the problem exists, it is an ICE in instantiate_decl.
    - it's a regression on 3.3. Code doesn't compile on 3.4,
      so I can't yet say what's on there
    - a somewhat smaller testcase is attached as reduced_1.ii
    - I will coordinate with Giovanni about how to further
      reduce the code. That's incredibly tedious business- on my way, I found a lot more ICEs. I'll reduce and submit
      them over time. If someone fixes the bug here and there
      are follow-up failures, please check for potentially
      submitted other bugs in this context
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10661