[sigc] [libsigc++-2.0.7] [Regression] Warnings from including sigc++/sigc++.h

[Andris Pavenis <pavenis latnet lv>]

The following test script

#! /bin/sh
echo '#include <sigc++/sigc++.h>' |\
gcc -c -O2 -W -Wall `pkg-config --cflags sigc++-2.0` -x c++ - -o /dev/null

generates warnings when including sigc++/sigc++.h:

In file included from /usr/include/sigc++-2.0/sigc++/signal_base.h:26,
                 from /usr/include/sigc++-2.0/sigc++/signal.h:8,
                 from /usr/include/sigc++-2.0/sigc++/sigc++.h:23,
                 from <stdin>:1:
/usr/include/sigc++-2.0/sigc++/type_traits.h:96: warning: all member functions
   in class `sigc::is_base_and_derived<T_base, T_derived>' are private

I think sigc++.h should not cause compiler warnings even if -W -Wall is specified
(For my own applications I often add also -Werror ...)

In any case there were no such problem with libsigc++-2.0.6.

I used gcc-3.3.5 under Linux

Andris

PS. There are more warnings when -W -Wall is specified and gcc-3.4.3 is used 
(from my earlier tests with libsigc++-2.0.6 for target i586-pc-msdosdjgpp)