Re: libstdc++/9975: time defined in :: namespace

[Martin Sebor <sebor@roguewave.com>]

The following reply was made to PR libstdc++/9975; it has been noted by GNATS.

From: Martin Sebor <sebor@roguewave.com>
To: bangerth@dealii.org,  gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: libstdc++/9975: time defined in :: namespace
Date: Fri, 07 Mar 2003 10:36:59 -0700

 FWIW, the problem is that according to 17.4.1.2 and 17.4.2.1,
 Footnote 160, the <cxxx> headers must declare symbols only
 namespace std, while the <xxx.h> headers must declare the
 same symbols in both the global namespace and namespace std.
 AFAIK, this can only be done correctly (as if) by inclusion
 followed by using declarations, i.e.,
 
     // <cxxx>
     namespace std {
     extern "C" void foo ();
     // ...
     }
 
     // <xxx.h>
     #include <cxxx>
     using std::foo;
     // ...
 
 Regards
 Martin
 
 PS A better test case might be
 
 $ cat t.cpp; g++ -c t.cpp
 #include <ctime>
 enum { time };
 
 t.cpp:2: `time' redeclared as different kind of symbol
 /usr/include/time.h:81: previous declaration of `time_t time(time_t*)'
 
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9975