[3.0.3, 2.95.3] Endless loop with strstream.h included w/o instream.h

[linguist-gcc at rich-paul dot net]

The following bit of code, from the ddd configure script, puts cc1plus
into an endless loop on my system, running slackware linux 8.0.  Adding
#include <iostream.h> b4 the strstream line fixes it.  The endless loop occurs
under both 3.0.3 and gcc-2.95.3.  Sorry 'bout the lame bug report, but I
haven't had time to put a real one together yet.

If this isn't repeatable elsewhere, don't hunt too hard:  I can't repeat it on
my other linux box, using an older slackware and compiler 3.0.1, so I want to
remove/reinstall the compiler and libraries b4 anybody goes nuts chasing it.

-- cut --
#line 10430 "configure"
#include "confdefs.h"
#include <strstream.h>
int main() {
ostrstream os; os.rdbuf()->freeze(0);
; return 0; }
-- cut --

I this is the error message I get b4 it enters the loop:

-- cut --
In file included from /opt/gcc-3.0.3/include/g++-v3/bits/std_iostream.h:40,
                 from /opt/gcc-3.0.3/include/g++-v3/backward/iostream.h:32,
                 from assert.h:45,
                 from /opt/gcc-3.0.3/include/g++-v3/bits/std_cassert.h:37,
                 from /opt/gcc-3.0.3/include/g++-v3/bits/stl_alloc.h:61,
                 from /opt/gcc-3.0.3/include/g++-v3/bits/std_memory.h:50,
                 from /opt/gcc-3.0.3/include/g++-v3/bits/std_string.h:43,
                 from /opt/gcc-3.0.3/include/g++-v3/bits/localefwd.h:42,
                 from /opt/gcc-3.0.3/include/g++-v3/bits/std_ios.h:43,
                 from /opt/gcc-3.0.3/include/g++-v3/backward/strstream:53,
                 from /opt/gcc-3.0.3/include/g++-v3/backward/strstream.h:33,
                 from configure:10431:
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:61: template-id 
   `num_put<_CharT, std::ostreambuf_iterator<_CharT, _Traits> >' used as a 
   declarator
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:61: parse error before `;' 
   token
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:62: template-id 
   `ctype<_CharT>' used as a declarator
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:62: parse error before `;' 
   token
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:169: type specifier omitted 
   for parameter
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:169: default argument for 
   template parameter in function template `std::basic_ostream<_CharT, 
   _Traits>& std::ios_base::seekp(typename _Traits::off_type)'
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:169: template definition of 
   non-template `std::basic_ostream<_CharT, _Traits>& 
   std::ios_base::seekp(typename _Traits::off_type)'
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:169: invalid member template 
   declaration `std::basic_ostream<_CharT, _Traits>& 
   std::ios_base::seekp(typename _Traits::off_type)'
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:175: template definition of 
   non-template `std::basic_ostream<_CharT, _Traits>& 
   std::ios_base::operator=(const std::basic_ostream<_CharT, _Traits>&)'
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:175: invalid member template 
   declaration `std::basic_ostream<_CharT, _Traits>& 
   std::ios_base::operator=(const std::basic_ostream<_CharT, _Traits>&)'
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:177: parse error before `const
   '
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h: In constructor 
   `std::basic_ostream<_CharT, 
   _Traits>::basic_ostream(std::basic_streambuf<_CharT, _Traits>*)':
/opt/gcc-3.0.3/include/g++-v3/bits/std_ostream.h:67: parse error before `;' 
   token
-- cut --


If I run it with -dy, the last 3 lines of the following output repeat forever.
-- cut --
Reducing via rule 24 (line 511), NAMESPACE identifier '{' @4 extdefs_opt '}'  -> extdef
state stack now 0 1 4
Entering state 38
Reducing via rule 13 (line 484), @2 extdef  -> lang_extdef
state stack now 0 1
Entering state 3
Reducing via rule 5 (line 452), extdefs lang_extdef  -> extdefs
state stack now 0
Entering state 1
Reading a token: Next token is 342 (END_OF_SAVED_INPUT)
Reducing via rule 12 (line 480),  -> @2
state stack now 0 1
Entering state 4
Next token is 342 (END_OF_SAVED_INPUT)
Shifting error token, Entering state 6
Next token is 342 (END_OF_SAVED_INPUT)
Discarding token 342 (END_OF_SAVED_INPUT).
Error: state stack now 0 1 4
Shifting error token, Entering state 6
Reading a token: Next token is 342 (END_OF_SAVED_INPUT)
Discarding token 342 (END_OF_SAVED_INPUT).
Error: state stack now 0 1 4
Shifting error token, Entering state 6
Reading a token: Next token is 342 (END_OF_SAVED_INPUT)
Discarding token 342 (END_OF_SAVED_INPUT).
Error: state stack now 0 1 4
Shifting error token, Entering state 6
Reading a token: Next token is 342 (END_OF_SAVED_INPUT)
Discarding token 342 (END_OF_SAVED_INPUT).
Error: state stack now 0 1 4
Shifting error token, Entering state 6
-- cut --

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