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From: Jason Griffis <jgriffis@ec.rr.com>
To: freebsd-questions@freebsd.org
Date: Mon, 21 Apr 2003 05:39:11 -0400
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Subject: g++ question
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=09I'm going through a C++ tutorial trying to increase my knowledge ;)
Any way.. I wrote this little code:

// My first program in C++
#include <iostream>

int main()
{
=09cout << "Hello World!";
=09return 0;
}

=09When I compile it this way with g++ I get errors due to the compiler n=
ot=20
finding the iostream file:

$ g++ -o hello hello.cc
hello.cc: In function `int main()':
hello.cc:6: `cout' undeclared (first use this function)
hello.cc:6: (Each undeclared identifier is reported only once for each=20
function
   it appears in.)
$

=09I do have iostream in /usr/include so I don't see why it's doing this,=
=20
whenever I change it to #include <iostream.h> it compiles fine but gives =
a=20
warning of using a deprecated header file:

$ g++ -o hello hello.cc
In file included from /usr/include/g++/backward/iostream.h:31,
                 from hello.cc:2:
/usr/include/g++/backward/backward_warning.h:32:2: warning: #warning This=
 file=20
includes at least one deprecated or antiquated header. Please consider us=
ing=20
one of the 32 headers found in section 17.4.1.2 of the C++ standard. Exam=
ples=20
include substituting the <X> header for the <X.h> header for C++ includes=
, or=20
<sstream> instead of the deprecated header <strstream.h>. To disable this=
=20
warning use -Wno-deprecated.
$

=09Obviously it isn't that big of a deal with such a small program but wh=
en I=20
move on to bigger projects that I'll want to use on different platforms o=
ther=20
than FreeBSD these errors and warnings will be a major pain. Can anyone t=
ell=20
me what might be wrong with my system in order for g++ not to see the nor=
mal=20
iostream header in /usr/include ?