cc1plus bails can't handle situation

Created attachment 25045
preprocessed source

fails with current 4.5 and 4.6 branches, and trunk.

$ g++ -std=c++0x -c bp_b.ii
src/bp/bp_b.cc: In lambda function:
src/bp/bp_b.cc:538:33: error: invalid conversion from 'tt_bookprxor::open_newfeeds()::x2feed*' to 'int' [-fpermissive]
src/bp/bp_b.cc:539:25: error: base operand of '->' is not a pointer
src/bp/bp_b.cc:540:24: error: 'x2feeds_i' was not declared in this scope
src/bp/bp_b.cc:540:58: error: return-statement with a value, in function returning 'void' [-fpermissive]
src/bp/bp_b.cc:545:9: warning: name lookup of 'x2feed_i' changed [enabled by default]
src/bp/bp_b.cc:534:46: warning: matches this 'x2feed_i' under ISO standard rules [enabled by default]
src/bp/bp_b.cc:538:22: warning: matches this 'x2feed_i' under old rules [enabled by default]
src/bp/bp_b.cc:545:55: error: cannot convert 'tt::feedhdlr*' to 'circlist<tt::feedhdlr*>*' in assignment
src/bp/bp_b.cc:547:5: internal compiler error: in pop_binding, at cp/name-lookup.c:382
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-snapshot/README.Bugs> for instructions.

You know what I'm going to ask... ;)

Sorry, I don't know, but I can venture some guesses:
Q. Why did I code in such a manner as to foil parsing of the source?
A. Careless, or worse? The error was obvious of course so in that respect a crash was as good as a diagnostic.
Q. You want the preprocessor output?
A. It's gone. I thought perhaps the bug reporting script grabbed it.
Q. Why didn't I attach the preprocessor output to the bug report?
A. I guess it wasn't immediately obvious how, and I was in a rush.
Q: What was the code that caused the problem?
A. I don't remember. I corrected it at the time. I should have saved it and should a similar situation arise in the future I will do so.

Here's the lambda in which the indicated errors used to be if that's any help. It iterates through a circular list of circular lists.

auto log_serviceorder = [&]() {
    const char* F = "%2d. %c[%d] %s id=%d\n";
    $LOG(log, BP, TTINF, "service order for %d feeds follows:\n", feedcount);
    for(int i=0; i < feedcount; i++) {
        circlist<tt::feedhdlr*>::node* feednode = feedgroups.next()->content.next();
        tt::feedhdlr* feed = feednode->content;
        $LOG(log,BP,TTINF,F, i, feed->venue(),feednode->id,feed->name(),feed->id());
    }
} ;

> Date: Fri, 19 Aug 2011 09:18:00 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: [Bug 827806]
>
> You know what I'm going to ask... ;)
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/827806
>
> Title:
> cc1plus bails can't handle situation
>
> Status in The GNU Compiler Collection:
> New
> Status in “gcc-4.5” package in Ubuntu:
> Confirmed
> Status in “gcc-4.6” package in Ubuntu:
> Confirmed
>
> Bug description:
> src/bp/bp_b.cc: In lambda function:
> src/bp/bp_b.cc:538:33: error: invalid conversion from ‘tt_bookprxor::open_newfeeds()::x2feed*’ to ‘int’
> src/bp/bp_b.cc:539:25: error: base operand of ‘->’ is not a pointer
> src/bp/bp_b.cc:540:24: error: ‘x2feeds_i’ was not declared in this scope
> src/bp/bp_b.cc:540:58: error: return-statement with a value, in function returning 'void'
> src/bp/bp_b.cc:545:9: warning: name lookup of ‘x2feed_i’ changed
> src/bp/bp_b.cc:534:46: warning: matches this ‘x2feed_i’ under ISO standard rules
> src/bp/bp_b.cc:538:22: warning: matches this ‘x2feed_i’ under old rules
> src/bp/bp_b.cc:545:55: error: cannot convert ‘tt::feedhdlr*’ to ‘circlist<tt::feedhdlr*>*’ in assignment
> src/bp/bp_b.cc:546: confused by earlier errors, bailing out
> Preprocessed source stored into /tmp/ccR2q49G.out file, please attach this to your bugreport.
>
> ProblemType: Crash
> DistroRelease: Ubuntu 11.04
> Package: g++-4.5 4.5.2-8ubuntu4
> ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
> Uname: Linux 2.6.38-10-generic x86_64
> NonfreeKernelModules: nvidia
> Architecture: amd64
> Date: Tue Aug 16 23:24:26 2011
> ExecutablePath: /usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/cc1plus
> InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
> SourcePackage: gcc-4.5
> UpgradeStatus: Upgraded to natty on 2011-05-29 (79 days...

I was winking at Matthias... As he knows well, a reduced testcase (say, below 100 lines) would help a lot, if/when you can.

Reducing.

Here is one which is an ICE on valid code:
int open()
{
  int *x2feed_i = 0;
  auto insert_feed = [&](unsigned char venue, int* newfeed)
  {
     for(int x2feed_i = 1; 0; ) ;
     x2feed_i = newfeed;
  }
}

The only reason why the original was invalid was the invalid use of x2feed_i inside the loop as I think the int should have been auto.

Author: jason
Date: Tue Aug 30 21:27:18 2011
New Revision: 178338

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=178338
Log:
 PR c++/50114
 * decl.c (poplevel): Disable for scope compatibility hack
 in C++11 mode.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-for.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/ext/forscope2.C

Fixed for 4.7.