egcs bug, std::deque

[Mike Fabian]

Hello,

I encountered a problem while using egcs-1.1.2.

I used Mumit Khan's egcs-1.1.2 release on cygwin-b20.1 on Windows NT,
     ~$ g++ --version
     egcs-2.91.66
but the same problem occurs with the egcs which comes with Redhat
Linux 5.2, therefore it probably is a egcs problem rather than a
cygwin problem.

the following small test program doesn't compile with egcs-1.1.2:

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#include <iostream>
#include <string>
#include <utility>
#include <deque>
#include <list>

class PairsOfStrings : public std::deque<std::pair<std::string,std::string> > 
{
};

void main(int argc, char* argv[]) 
{
	PairsOfStrings d;
	std::string s1("field1"),s2("value1"),s3("field2"),s4("value2");
	d.push_back(std::make_pair(s1,s2));
	d.push_back(std::make_pair(s3,s4));

	std::string str = "";
	for(PairsOfStrings::const_iterator p=d.begin();p!=d.end();p++) {
		// the following line doesn't compile with egcs:
		str +=	p->first + p->second;  
	}
	std::cout << str << std::endl;
}
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The error message is:

test.cpp: In function `int main(...)':
test.cpp:21: result of `operator->()' yields non-pointer result
test.cpp:21: result of `operator->()' yields non-pointer result

When `list' is used instead of `deque', the program compiles fine
and works as expected.

With Microsoft's VC 5.0 the program compiles without errors
for `deque' as well (and the program runs correctly).

Is this possibly a bug in egcs??


Mike

PS:
here is the complete output of the compiler:
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cd d:/home/fabian/cpp/
g++ test.cpp -o test.exe
C:/cygnus/cygwin-b20/H-i586-cygwin32/bin/../lib/gcc-lib/i586-cygwin32/egcs-2.91.66/../../../../../include/g++/stl_deque.h: In method `const struct pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > > & __deque_iterator<pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > >,const pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > > &,const pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > > &,0>::operator -><pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > >, const pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > > &, const pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > > &, 0>() const':
test.cpp:21:   instantiated from here
C:/cygnus/cygwin-b20/H-i586-cygwin32/bin/../lib/gcc-lib/i586-cygwin32/egcs-2.91.66/../../../../../include/g++/stl_deque.h:132: conversion from `const pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > > *' to non-scalar type `pair<basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> >,basic_string<char,string_char_traits<char>,__default_alloc_template<false,0> > >' requested
test.cpp: In function `int main(...)':
test.cpp:21: result of `operator->()' yields non-pointer result
test.cpp:21: result of `operator->()' yields non-pointer result

Compilation exited abnormally with code 1 at Tue May 18 15:41:19
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