gcc-3.3 issues

Michael Nottebrock michaelnottebrock at gmx.net
Fri Jul 18 01:33:06 PDT 2003


On Thursday 17 July 2003 22:50, Mikhail Teterin wrote:

> Here is how to reproduce the problem, Michael is talking about. Simply
> try to build the kdelibs3 (or kdegraphic3, or kdenetwork3) port.

I've tried to come up with a less obscure testcase:

#include <string>
#include <iostream>
using namespace std;

int main ()
{

  string astring="Hello World";
  cout << astring << endl;
}

Now, if I compile this on 5.1-RELEASE with 

c++ -Wnon-virtual-dtor -Wno-long-long -Wall -pedantic -W -Wpointer-arith 
-Wmissing-prototypes -Wwrite-strings -DNDEBUG -DNO_DEBUG -O -pipe 
-mcpu=pentiumpro -fno-check-new -L/usr/local/lib -I/usr/local/include 
-I/usr/local/include -I/usr/X11R6/include -D_GETOPT_H -o helloworld 
helloworld.cc

I get a plethora of warnings:

In file included from /usr/include/g++/memory:55,
                 from /usr/include/g++/string:48,
                 from helloworld.cc:1:
/usr/include/g++/bits/stl_alloc.h:979: warning: ISO C++ forbids the use of `
   extern' on explicit instantiations
/usr/include/g++/bits/stl_alloc.h:980: warning: ISO C++ forbids the use of `
   extern' on explicit instantiations
/usr/include/g++/bits/stl_alloc.h:981: warning: ISO C++ forbids the use of `
   extern' on explicit instantiations
/usr/include/g++/bits/stl_alloc.h:981: warning: ISO C++ forbids the use of `
   extern' on explicit instantiations
/usr/include/g++/bits/stl_alloc.h:981: warning: ISO C++ forbids the use of `
   extern' on explicit instantiations

[and many, many more]

but it will compile. If I omit -pedantic, none of these warnings occur. The 
thing is, in -CURRENT with the new gcc, all these warnings for some reason 
become errors. The other thing is, if I try this with with a ports-compiled 
g++32 on 4-STABLE, I don't get warnings at all, no matter if -pedantic is 
specified or not.

So here's the questions for the experts:

- Why errors instead of warnings?
- Why do gcc's own bits seem to not conform to some kind of standard that it 
tries to adhere to in 5-CURRENT but not in 4-STABLE?
- Who's to blame?

-- 
Michael Nottebrock \        KDE on FreeBSD    \            ,ww  
                    \            ---           \   ,wWWCybaWW_) 
                     \  http://freebsd.kde.org  \   `WSheepW'    free
                                                 \    II  II     node
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