Something's wrong with recent g++ include files

[Phil Edwards]

On Fri, Dec 01, 2000 at 01:39:02PM -0500, David Ronis wrote:
> 
> -------------------------------------------------------
> #include <iostream.h>
> int main(){ cout << "Hello World!" << endl; return 0;}
> -------------------------------------------------------
[....]
> foo.c++:1:22: iostream.h: No such file or directory

This code is, strictly speaking, incorrect.  Welcome to namespaces and
the new C++.  :-)


> Sure enough, /usr/include/g++-v3 contains iostream, but not iostream.h
> (or most other .h files), moreover when I change the include to
> iostream (which can't be correct) I still get an error that cout and
> endl aren't defined.  The preprocessed file for this case is attached.
> 
> This used to work a snapshot or so ago.

The snapshots have been non-compliant up until a snapshot or so ago.  :-)

ISO Standard C++ only defines an <iostream> header, not an <iostream.h>.
Please see http://gcc.gnu.org/libstdc++/17_intro/howto.html for more.

If you absolutely must use <iostream.h> -- and the classes in there are
very old, not just <iostream> with a 'using std::foo', either -- then
you must add -I/wherever/you/installed/gcc/include/g++-v3/backward to the
command line.  Older headers are installed in the 'backward' subdirectory.


Luck++;
Phil

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