[Bug c++/35057] New: Integer variable value lost due to optimizations?

[olafvdspek at gmail dot com]

Forwarded from http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=456930

With -O2 it calls bind with 0, without and with -O3 it works fine.
Asio is a C++ networking library.

$ g++ -I misc -lpthread t.cpp && strace ./a.out
...
bind(6, {sa_family=AF_INET, sin_port=htons(2711),
sin_addr=inet_addr("0.0.0.0")}, 16) = 0
...

$ g++ -I misc -O2 -lpthread t.cpp && strace ./a.out 
...
bind(6, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("0.0.0.0")},
16) = 0
...

http://downloads.sourceforge.net/asio/asio-0.3.9.tar.bz2?modtime=1197163255&big_mirror=0

#include <asio.hpp>

class server
{
public:
        server(asio::io_service&);
        asio::ip::tcp::acceptor acceptor_;
};

server::server(asio::io_service& io_service):
        acceptor_(io_service,
asio::ip::tcp::endpoint(asio::ip::tcp::v4(), 2711))
{
}

int main()
{
        asio::io_service io_service;
        server s(io_service);
        return 0;
}

$ g++ -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.3-20080127-1'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3
--enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr
--enable-targets=all --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.3.0 20080127 (experimental) [trunk revision 131882] (Debian
4.3-20080127-1)


-- 
           Summary: Integer variable value lost due to optimizations?
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: olafvdspek at gmail dot com
GCC target triplet: i486-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35057