stack being smashing

Hi list,

first of all, I have to say that I'm really excited to use boost::spirit
more regularly. A parser integrated directly into the language is much
better than requiring separate grammar files or separate tools.

I am having a really strange issue though, and I'm sure it's probably just
user error. Somehow my stack is being smashed by the parser when I define
BOOST_SPIRIT_DEBUG. The smashed stack was detected by default using gcc /
linux (versions ranging from 4.9 to 7.2), but clang / mac was actually
producing the expected results until I added -fstack-protector-strong.

I filed a bug report, although perhaps it is simply a user error. I've read
the docs and rewrote to no avail.

https://svn.boost.org/trac10/ticket/13370

In any case, I'll just try and outline the issue with relevant parts below
- I haven't found the root cause unfortunately.

Any help would be much appreciated.

C

typedef std::pair<std::string,uint8_t> token_val_t;


template <typename Iterator>

struct grammar_

  : qi::grammar<Iterator, token_val_t()>

{

    grammar_()

      : grammar_::base_type( resp )

    {

using qi::hex;

using ascii::string;

using phoenix::construct;

        resp %= ok | err;

        ok = ( string( "OK" ) ) [ _val = construct<token_val_t>( _1, 0 ) ];

        err = ( string( "E" ) > hex ) [ _val = construct<token_val_t>( _1,
_2 ) ];

    }


    qi::rule<Iterator, token_val_t()> resp;

    qi::rule<Iterator, token_val_t()> ok, err;

};


The input to this parser is the string "OK" ... so yeah... not really sure
what's causing it to segfault.


My debug log is:

$ ./test/test_set_thread

Running main() from gtest_main.cc

[==========] Running 7 tests from 1 test case.

[----------] Global test environment set-up.

[----------] 7 tests from test_set_thread_fixture

[ RUN      ] test_set_thread_fixture.TestOpOtherIdAny

D: client.cpp: 115: created client

D: set_thread.cpp: 134: generating request..

D: client.cpp: 229: sending request 'Hg0'

D: client.cpp: 234: request frame is '$Hg0#df'

D: client.cpp: 82: D: client.cpp: 92: D: client.cpp: 136: about to call
qi::parse()

D: client.cpp: 145: Parsing succeeded \o/. Received 2 (unchecked) frames!

D: client.cpp: 149: (unchecked) frame is '+'

D: client.cpp: 154: Received an ACK! \o/

D: client.cpp: 149: (unchecked) frame is '$OK#9a'

D: client.cpp: 172: frame is 'OK' cs is '9a'

D: client.cpp: 190: Parsed 2 frames

D: client.cpp: 201: r: '+'

D: client.cpp: 205: longest_payload: 1

D: client.cpp: 252: Received an ACK \o/

D: set_thread.cpp: 138: about to call get_next_frame()

D: client.cpp: 82: D: client.cpp: 92: D: client.cpp: 201: r: 'OK'

D: client.cpp: 205: longest_payload: 2

D: set_thread.cpp: 142: input is 'OK'

D: set_thread.cpp: 151: about to call parse()

<resp>

  <try>Segmentation fault: 11

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