Re: [libstdc++] Document and guard stdio_filebuf.h

[Phil Edwards <phil at jaj dot com>]

On Tue, May 21, 2002 at 01:59:58PM -0700, Mark Mitchell wrote:
> --On Tuesday, May 21, 2002 04:59:10 PM -0400 Phil Edwards <phil@jaj.com> 
> wrote:
> > It also adds multiple inclusion guards.  Since those are not
> > documentation, I'm formally requesting branch approval under rule #2.a
> > from
> >
> >     http://gcc.gnu.org/ml/gcc/2002-05/msg01212.html
> 
> Are there ways to get errors by trying to #include this file more than
> once at present?

Shiver me timbers.  I didn't think there were, but there are.  Using the
current branch compiler:

    29% cat foo.cc

    #include <ext/stdio_filebuf.h>
    #include <ext/stdio_filebuf.h>

    int main() { }

    30% g++ foo.cc
    In file included from foo.cc:3:
    /home/pme/build/install-2002-05-21-3branch/include/g++-v3/ext/stdio_filebuf.h:35: redefinition
       of default argument for `class _Traits'
    /home/pme/build/install-2002-05-21-3branch/include/g++-v3/ext/stdio_filebuf.h:34:
        original definition appeared here
    /home/pme/build/install-2002-05-21-3branch/include/g++-v3/ext/stdio_filebuf.h:36: redefinition
       of `class __gnu_cxx::stdio_filebuf<_CharT, _Traits>'
    /home/pme/build/install-2002-05-21-3branch/include/g++-v3/ext/stdio_filebuf.h:36: previous
       definition of `class __gnu_cxx::stdio_filebuf<_CharT, _Traits>'
    31%

If the second #include is removed, or the patch is applied, compilation
succeeds.


Phil

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