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From: "=?KOI8-R?Q?=F2=CF=CD=C1=CE?=" <rod1gin AT ngs DOT ru>
Subject: Errors in handling of boost::asio errors ('boost' was compiled with wrong std::string representation?)
To: cygwin AT cygwin DOT com
Date: Sat, 21 Nov 2015 11:33:20 +0600
Message-ID: <web-32611685@mx27.intranet.ru>
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Following program:

--------------- begin of code
#include <stdio.h>
#include <boost/system/error_code.hpp>

int main()
{
     std::string s = 
boost::system::generic_category().message(22);

     printf("size=%lu, c_str=\"%s\".\n",
             s.size(),
             s.c_str());

     return 0;
}
--------------- end of code

Give out following output:

--------------- begin of output
size=1628781863, c_str="Invalid argument".
--------------- end of output

If I try to use such string, for example:
   std::string a("");
   a += s;
program crashes.

The program was compiled from cygwin command line by 
following commands:

--------------- begin of commands
g++ -c test.cpp
gcc -s test.o -lstdc++ -lboost_system
--------------- end of commands

I used fresh installed cygwin with following additional 
packages:
   Devel / gcc-core 5.2.0-1
   Devel / gcc-g++ 5.2.0-1
   Libs / libgcc1 5.2.0-1
   Libs / libstdc++6 5.2.0-1
   Devel / make 4.1-1
   Libs / libboost-devel 1.58.0-1

Operating system: Windows XP, 32 bits, russian language
Processor: Intel Pentium 4 (3 GHz)
Version of installator: setup-x86.exe, 2.873

With libboost-devel 1.57.0-1 effect is the same.

With Windows 7, 64 bit, russian language, effect is the 
same (with 32-bit and with 64-bit cygwin), with the 
exception that another wrong values are exposed for 
'size'.

When I compile boost from sources ('boost_1_59_0.7z' from 
boost org), the same program is running as proper:

--------------- begin of correct output
size=16, c_str="Invalid argument".
--------------- end of correct output

Constant '22' corresponds to 
'boost::asio::error::invalid_argument'. Some other ASIO 
error codes also brings to the same effect. Aforementioned 
code is used in handling of exceptions from ASIO functions 
and brings to crashes in various unpredictable situations.

There is more real-life piece of code that produce same 
error:

--------------- begin of example #2
#include <stdio.h>
#include <boost/asio.hpp>

int main()
{
     boost::asio::ip::address_v4 a;
     boost::system::error_code ec;
     a.from_string("127.0.0.1111", ec);

     std::string s = ec.message();

     printf("size=%lu, c_str=\"%s\".\n",
             s.size(),
             s.c_str());

     return 0;
}
--------------- end of example #2

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