Looking for tool to convert source code for beyond g++2.95

[Ray Earley]

I am hoping to find a tool to help modify c++ code to work with g++ 
compilers/libraries version 3 and above.  We have a large body of 
software, thousands of source files and millions of lines of code, which 
builds fine under gcc 2.96 (Mandrake linux, I realize not an "official" 
gnu release).  It was originally built on Sun/SGI platforms and still 
compiles there with conditional directives to handle platform/compiler 
differences.

As I pondered writing something to do the modifications, it occurred to 
me that there is likely a piece of software out there to do what I need. 
 It's a similar situation to some time ago converting a group of C 
programs from K&R to ANSI C, and the program 'protoize' was a godsend.

Among the things I know need to be dealt with are the namespace issue ( 
"using namespace std" and corrupting the std namespace, or inserting 
std:: in all the appropriate places) and the new header names ( dropping 
.h for C++ headers, and using cxxx instead of xxx.h for C headers). 
There are probably other changes I have not become aware of yet.

I have scoured the web and newsgroups and not found anything but hope I 
just haven't used the right search terms or searched the right places 
yet.  Anyone have any suggestions?

Thanks in advance,
Ray