RE: [ROOT] Dictionary not compilable with GCC 3.0

From: Philippe Canal (pcanal@fnal.gov)
Date: Fri Aug 09 2002 - 22:24:06 MEST 

Hi,

This seems on incompatibility between CINT and gcc 3.0.  It is likely (I did
not test it but other reports point to this) that it would work with gcc 3.1

Cheers,
Philippe

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Brett Viren
Sent: Friday, August 09, 2002 1:24 PM
To: roottalk
Subject: [ROOT] Dictionary not compilable with GCC 3.0


Hi,

Bug report for you.


We have a class (PlexSEIdAltL) which subclasses an STL vector
(std::vector<PlexSEIdAltLItem>) and has a LinkDef.h entry like:

#pragma link C++ class PlexSEIdAltL+;

The generated Streamer code failes to compile under GCC 3.0.4.  The
generated code is:

void PlexSEIdAltL::Streamer(TBuffer &R__b)
{
   // Stream an object of class PlexSEIdAltL.

   if (R__b.IsReading()) {
      PlexSEIdAltL::Class()->ReadBuffer(R__b, this);
      {
         clear();
         int R__i, R__n;
         R__b >> R__n;
         for (R__i = 0; R__i < R__n; R__i++) {
            PlexSEIdAltLItem R__t;
            R__t.Streamer(R__b);
            push_back(R__t);
         }
      }
   } else {
      PlexSEIdAltL::Class()->WriteBuffer(R__b, this);
      {
         R__b << int(size());
         vector<PlexSEIdAltLItem,__malloc_alloc_template<0> >::iterator
R__k;
         for (R__k = begin(); R__k != end(); ++R__k) {  // <---- ERROR
            (*R__k).Streamer(R__b);
         }
      }
   }
}

Where I have marked the line generating the error.  If the declaration
of the iterator is changed from:

	vector<PlexSEIdAltLItem,__malloc_alloc_template<0> >::iterator R__k;
to
	vector<PlexSEIdAltLItem>::iterator R__k;

then compilation succeeds.

The error message is:

/home/bviren/srt/minossoft/releases/development/tmp/Linux2-GCC_3_0/Plex/libP
lex-shared/PlexCint.cc: In
   member function `virtual void PlexSEIdAltL::Streamer(TBuffer&)':
/home/bviren/srt/minossoft/releases/development/tmp/Linux2-GCC_3_0/Plex/libP
lex-shared/PlexCint.cc:2209: no
   match for `std::__normal_iterator<PlexSEIdAltLItem*,
   std::vector<PlexSEIdAltLItem, std::__malloc_alloc_template<0> > >& =
   std::__normal_iterator<PlexSEIdAltLItem*, std::vector<PlexSEIdAltLItem,
   std::allocator<PlexSEIdAltLItem> > >' operator
/usr/include/g++-v3/bits/stl_iterator.h:453: candidates are:
   std::__normal_iterator<PlexSEIdAltLItem*, std::vector<PlexSEIdAltLItem,
   std::__malloc_alloc_template<0> > >&
   std::__normal_iterator<PlexSEIdAltLItem*, std::vector<PlexSEIdAltLItem,
   std::__malloc_alloc_template<0> > >::operator=(const
   std::__normal_iterator<PlexSEIdAltLItem*, std::vector<PlexSEIdAltLItem,
   std::__malloc_alloc_template<0> > >&)

(and a similar error for the "!=" operation)

Which, if you stare at it long enough, seems that std::vector::begin()
returns an iterator with a different allocator than the explicitly
stated one.


ROOT is from CVS as of yesterday or so, GCC 3.0.4 on Debian x86.

-Brett.

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