C++ (2.95.X) STRANGE BEHAVIOUR

[sysadm <sysadm_99 at yahoo dot com>]

I 've installed in several machines (different OS's)
gcc-2.95.1. Trying to compile some pretty standard
things in C++ like KDE-1.1.2 or Netscape's Mozilla M11
I get warnings that gcc-2.7.x, 2.8.x may not output.
Up to that point all are fine.
The problem is that after these warnings the "make"
command will STOP! as it was a real error. Have I
missed something? Do I need some extra -fX options so
that C++ (2.95.1) will continue to compile after
these warnings ???  (see below)
The above it doesnt happens with gcc 2.8.1 or 2.7.2.X
Can it be that we have a new release of GCC that will
not compile major chunks of free software???  

EG:

C++ (c++ -2.95.1) ERRORS

=======================================================
KDE-1.1.2 - LIBS

/bin/sh ../libtool --silent --mode=compile g++
-DHAVE_CONFIG_H -I. -I. -I.. 
-I/usr/kde//include -O2 -c fakes.cpp
fakes.cpp: In function `void usleep(unsigned int)':
fakes.cpp:71: implicit declaration of function `int
select(...)'
make[2]: *** [fakes.lo] Error 1
=======================================================

This is just a warning with GNU gcc-2.8.1.
The program however builds fine and works fine!
Here compilation STOPS.

=======================================================
MOZILLA (M11 - NEWEST TEST RELEASE)
Module "xpcom" (but almost all the others also)

In file:
nsFileSpecUnix.cpp: In function `static void
nsFileSpecHelpers::Canonify(nsSimpleCharString &,
int)':

nsFileSpecUnix.cpp:92: warning: choosing
`nsSimpleCharString::operator char *()' over 
`nsSimpleCharString::operator const char *() const'
nsFileSpecUnix.cpp:92: warning:   for conversion from
`nsSimpleCharString' to `const char *'
nsFileSpecUnix.cpp:92: warning:   because conversion
sequence for the argument is better

nsFileSpecUnix.cpp:105: warning: choosing
`nsSimpleCharString::operator char *()' over 
`nsSimpleCharString::operator const char *() const'
nsFileSpecUnix.cpp:105: warning:   for conversion from
`nsSimpleCharString' to `const char *'
nsFileSpecUnix.cpp:105: warning:   because conversion
sequence for the argument is better

nsFileSpecUnix.cpp: In method `nsresult
nsFileSpec::ResolveSymlink(PRBool &)':
nsFileSpecUnix.cpp:208: warning: choosing
`nsSimpleCharString::operator char *()' over 
`nsSimpleCharString::operator const char *() const'
nsFileSpecUnix.cpp:208: warning:   for conversion from
`nsSimpleCharString' to `const char *'
nsFileSpecUnix.cpp:208: warning:   because conversion
sequence for the argument is better

make[2]: *** [nsFileSpec.o] Error 1

=======================================================

I looked this code and I don't know why it finds it
so bad that has to STOP and produce an error.
Netscape lists as development tool "egcs" 1.0.3 and
on.
Can gcc-2.95.1 (c++) be so different from egcs?  
So that egce will compile M11 but 2.95.X will NOT?
 
I am about to revert to gcc-2.8.1 . 
Any suggestions from the C++ gurus will be greatly
appreciated.

Regards,
Alex


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