id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4008	Segfault in program_options::parse_command_line when compiled with -fshort-enums	Severin Kacianka <severin@…>	Vladimir Prus	"Hello,

I am new to C++ and bug finding in general, so I hope am not reporting something obvious. 
When diving into program_options I wrote the following sample program:

{{{
// test.cpp
#include <boost/program_options.hpp> 
#include <iostream>
#include <fstream>

namespace po = boost::program_options; 

int main(int argc, char **argv)
{

    int result = EXIT_SUCCESS;
	po::options_description desc(""Allowed options""); 
	desc.add_options()
		(""help"", ""Displays help message"")
		(""port"",po::value<int>(),""Port to use"")
	;
	po::options_description cmdline_options;
	cmdline_options.add(desc);
	po::options_description config_file_options;
	config_file_options.add(desc);
	po::variables_map vm;
	po::store(po::parse_command_line(argc, argv, desc), vm);
	po::notify(vm);

	if (vm.count(""port"")) {
		std::cout << ""port was set to "" 
		 << vm[""port""].as<int>() << "".\n"";
	} else {
		std::cout << ""port was not set.\n"";
	}

	return result;
}
}}}

When compiled 'normally' it works:
{{{
$ g++  test.cpp -lboost_program_options
$ ./a.out --port 60
port was set to 60.
}}}
but when I compile it with -fshort-enums it segfaults:
{{{
$ g++ -fshort-enums test.cpp -lboost_program_options
$./a.out 
Segmentation fault
}}}

My gcc version:
{{{
 g++ -v
Reading specs from /usr/lib/gcc/i486-slackware-linux/4.2.4/specs
Target: i486-slackware-linux
Configured with: ../gcc-4.2.4/configure --prefix=/usr --enable-shared --enable-languages=ada,c,c++,fortran,java,objc --enable-threads=posix --enable-__cxa_atexit --disable-checking --with-gnu-ld --verbose --with-arch=i486 --target=i486-slackware-linux --host=i486-slackware-linux
Thread model: posix
gcc version 4.2.4
}}}

Valgrind output of the crashing binary:
{{{
valgrind a.out 
==11266== Memcheck, a memory error detector.
==11266== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==11266== Using LibVEX rev 1804, a library for dynamic binary translation.
==11266== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==11266== Using valgrind-3.3.0, a dynamic binary instrumentation framework.
==11266== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==11266== For more details, rerun with: -v
==11266== 
==11266== Conditional jump or move depends on uninitialised value(s)
==11266==    at 0x804EF64: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EFBC: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::~function1() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050AD7: boost::program_options::detail::cmdline::~cmdline() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050B6B: boost::program_options::basic_command_line_parser<char>::~basic_command_line_parser() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8056277: boost::program_options::basic_parsed_options<char> boost::program_options::parse_command_line<char>(int, char**, boost::program_options::options_description const&, int, boost::function1<std::pair<std::string, std::string>, std::string const&>) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804DE66: main (in /home/severin/swpr-02/examples/conf/a.out)
==11266== 
==11266== Conditional jump or move depends on uninitialised value(s)
==11266==    at 0x804EF7A: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EFBC: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::~function1() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050AD7: boost::program_options::detail::cmdline::~cmdline() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050B6B: boost::program_options::basic_command_line_parser<char>::~basic_command_line_parser() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8056277: boost::program_options::basic_parsed_options<char> boost::program_options::parse_command_line<char>(int, char**, boost::program_options::options_description const&, int, boost::function1<std::pair<std::string, std::string>, std::string const&>) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804DE66: main (in /home/severin/swpr-02/examples/conf/a.out)
==11266== 
==11266== Use of uninitialised value of size 4
==11266==    at 0x804EF39: boost::detail::function::basic_vtable1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear(boost::detail::function::function_buffer&) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EF99: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EFBC: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::~function1() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050AD7: boost::program_options::detail::cmdline::~cmdline() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050B6B: boost::program_options::basic_command_line_parser<char>::~basic_command_line_parser() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8056277: boost::program_options::basic_parsed_options<char> boost::program_options::parse_command_line<char>(int, char**, boost::program_options::options_description const&, int, boost::function1<std::pair<std::string, std::string>, std::string const&>) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804DE66: main (in /home/severin/swpr-02/examples/conf/a.out)
==11266== 
==11266== Use of uninitialised value of size 4
==11266==    at 0x804EF42: boost::detail::function::basic_vtable1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear(boost::detail::function::function_buffer&) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EF99: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EFBC: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::~function1() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050AD7: boost::program_options::detail::cmdline::~cmdline() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050B6B: boost::program_options::basic_command_line_parser<char>::~basic_command_line_parser() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8056277: boost::program_options::basic_parsed_options<char> boost::program_options::parse_command_line<char>(int, char**, boost::program_options::options_description const&, int, boost::function1<std::pair<std::string, std::string>, std::string const&>) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804DE66: main (in /home/severin/swpr-02/examples/conf/a.out)
vex x86->IR: unhandled instruction bytes: 0x67 0x5 0x8 0x0
==11266== 
==11266== Invalid read of size 4
==11266==    at 0x805A539: ???
==11266==    by 0x804EF99: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EFBC: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::~function1() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050AD7: boost::program_options::detail::cmdline::~cmdline() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050B6B: boost::program_options::basic_command_line_parser<char>::~basic_command_line_parser() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8056277: boost::program_options::basic_parsed_options<char> boost::program_options::parse_command_line<char>(int, char**, boost::program_options::options_description const&, int, boost::function1<std::pair<std::string, std::string>, std::string const&>) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804DE66: main (in /home/severin/swpr-02/examples/conf/a.out)
==11266==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==11266== 
==11266== Process terminating with default action of signal 11 (SIGSEGV)
==11266==  Access not within mapped region at address 0x0
==11266==    at 0x805A539: ???
==11266==    by 0x804EF99: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::clear() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804EFBC: boost::function1<std::vector<boost::program_options::basic_option<char>, std::allocator<boost::program_options::basic_option<char> > >, std::vector<std::string, std::allocator<std::string> >&>::~function1() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050AD7: boost::program_options::detail::cmdline::~cmdline() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8050B6B: boost::program_options::basic_command_line_parser<char>::~basic_command_line_parser() (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x8056277: boost::program_options::basic_parsed_options<char> boost::program_options::parse_command_line<char>(int, char**, boost::program_options::options_description const&, int, boost::function1<std::pair<std::string, std::string>, std::string const&>) (in /home/severin/swpr-02/examples/conf/a.out)
==11266==    by 0x804DE66: main (in /home/severin/swpr-02/examples/conf/a.out)
==11266== 
==11266== ERROR SUMMARY: 5 errors from 5 contexts (suppressed: 23 from 1)
==11266== malloc/free: in use at exit: 568 bytes in 33 blocks.
==11266== malloc/free: 39 allocs, 6 frees, 704 bytes allocated.
==11266== For counts of detected errors, rerun with: -v
==11266== searching for pointers to 33 not-freed blocks.
==11266== checked 119,684 bytes.
==11266== 
==11266== LEAK SUMMARY:
==11266==    definitely lost: 0 bytes in 0 blocks.
==11266==      possibly lost: 136 bytes in 6 blocks.
==11266==    still reachable: 432 bytes in 27 blocks.
==11266==         suppressed: 0 bytes in 0 blocks.
==11266== Rerun with --leak-check=full to see details of leaked memory.
Segmentation fault

}}}

If I can help you finding the cause, just write me an e-mail :-)"	Bugs	closed	Boost 1.43.0	program_options	Boost 1.42.0	Showstopper	invalid