[tbm at cyrius.com: Bug#441533: GCC 4.3 related: missing #includes]

Steve M. Robbins steve at sumost.ca
Tue Dec 11 18:10:18 CET 2007

On Tue, Dec 11, 2007 at 08:03:03AM +0100, Marc Glisse wrote:
> On Mon, 10 Dec 2007, Tim Van Holder wrote:
>>> A Debian user has reported a missing #include in gmp.h.
>>>> /usr/include/gmp.h:520: error: 'std::FILE' has not been declared
>>> +#include <iostream> /* for std::FILE */
>> std::FILE is the C++ way of referring to C's file - so I think the
>> correct include is <cstdio>, NOT <iostream>.
> Indeed.
> Besides, I don't think there is a missing #include in gmp.h, the error lies 
> elsewhere. The code with FILE in gmp.h is protected by a check that the 
> stdio header was included. Now I believe the issue is that the glibc/gcc 
> standard headers are c++-buggy in the sense that including stdio.h puts 
> FILE only in the global namespace and not also in the std:: namespace as it 
> should. 

I'm never sure what header should declare what.  
Where did you find such a list?

> Alternatively, the kde code that includes stdio.h before including 
> gmp.h should include cstdio instead (or both just to be sure).
> Note that it is a documented feature of gmp that you need to include 
> stdio.h/cstdio before gmp.h if you want the FILE related functions.

Well, the docs do mention stdio.h, but not cstdio.

> Now the reason for not including stdio by default for gmp is I think less 
> relevant for C++ than for C, and it could make sense to always include it 
> for C++ the way S. Robbins suggests.

That strikes me as a good change.

It would be less surprising to the programmer, as not everyone reads
the docs from cover to cover.  If you look only at, say, the docs for
gmp_fprintf(), you won't see anything about #including stdio.h.

Incidentally: why not include stdio.h by default?

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