Subject: [everybody] Testing new GCC
Date: 29 Dec 2002 17:49:21 -0600
From: Matt Hoosier <mwhoosier@cis.ksu.edu>
To: everybody@cis.ksu.edu

We are testing a new version of GCC (the default C/C++ compiler on CIS
systems).

Most programs should work unchanged. Please let us know if there is a
problem with a program that used to compile under the old version of GCC
(2.8.1) but does not compile under the new version of GCC (3.2.1).

We have observed at least one change that needs to be made to old C++
programs:

* in programs using standard IO libraries (cin, cout, cerr, etc) by way
of the official C++ headers ("#include <iostream>"), you must now
explicitly include the "std" namespace. GCC has dropped its default
support for the deprecated automatic inclusion of the "std" namespace.

Example:

> Old program
> -----------
>     #include <iostream>
>
>     int main() {
>         cout << "hello world" << endl;
>         return 0;
>     }

> Patched program
> ---------------
>     #include <iostream>
>
>     using namespace std;
>
>     int main() {
>         cout << "hello world" << endl;
>         return 0;
>     }

Thanks,

Matt Hoosier
CIS Accounts Manager
Kansas State University

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