This is the mail archive of the
gcc-prs@gcc.gnu.org
mailing list for the GCC project.
libstdc++/4523: regression: struct in namespace containing an ifstream defined outside
- To: gcc-gnats at gcc dot gnu dot org
- Subject: libstdc++/4523: regression: struct in namespace containing an ifstream defined outside
- From: benko at sztaki dot hu
- Date: 10 Oct 2001 16:25:51 -0000
- Reply-To: benko at sztaki dot hu
>Number: 4523
>Category: libstdc++
>Synopsis: regression: struct in namespace containing an ifstream defined outside
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Wed Oct 10 09:26:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Pal Benko
>Release: 3.0.1
>Organization:
>Environment:
SuSE 7.1, linux 2.4.6, i686
>Description:
Perhaps this is a c++ bug. Compiling the following:
---------------------------------------------------->8
#include <fstream>
namespace w
{
struct a;
}
struct w::a
{
std::ifstream i_;
};
----------------------------------------------------->8
Gives the following error messages:
arta:~/c/proba$ /gml/shared/gcc-3.0.1/bin/g++ -c fstream_test.cc
/gml/shared/gcc-3.0.1/include/g++-v3/bits/std_streambuf.h: In instantiation of `std::basic_streambuf<char, std::char_traits<char> >':
/gml/shared/gcc-3.0.1/include/g++-v3/bits/std_fstream.h:245: instantiated from `std::basic_filebuf<char, std::char_traits<char> >'
/gml/shared/gcc-3.0.1/include/g++-v3/bits/std_fstream.h:245: instantiated from `std::basic_ifstream<char, std::char_traits<char> >'
fstream_test.cc:10: instantiated from here
/gml/shared/gcc-3.0.1/include/g++-v3/bits/std_streambuf.h:77: `__copy_streambufs'
was not declared in this scope
2.95.3 compiles this OK. Precompiling this with 2.95.3
and compiling the resulting code with 3.0.1 gives
arta:~/c/proba$ /gml/shared/gcc-2.95.3/bin/g++ -E -o fstream_test.ii fstream_test.cc
arta:~/c/proba$ /gml/shared/gcc-3.0.1/bin/g++ -c fstream_test.ii
fstream_test.cc:10: ISO C++ forbids declaration of `ifstream' with no type
fstream_test.cc:10: invalid use of `::'
fstream_test.cc:10: parse error before `;' token
If the "std::" is removed, then compilation works.
Precompiling with 3.0.1 and compiling with 2.95.3 gives lots of errors,
but obviously because of libstdc++-3.
Workaround:
--------------------------------------------------->8
#include <fstream>
namespace w
{
struct a
{
mutable std::ifstream i_;
};
}
----------------------------------------------------->8
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: