splitted source (decl, def) gives compile errors byy use for test suite

Hello,

I run into a compiler error :

test/grammar_api.cpp: In function 'const string_literal_type& 
string_literal()':
test/grammar_api.cpp:1291:9: error: 'string_literal' is not a member of 
'parser'
   return parser::string_literal;
          ^~~~~~

using spirit x3 with these project organization:

* include/my/grammar.hpp:
----8<----
namespace parser {
         // Parser Rule IDs
         struct string_literal_class;
         ...
         // Parser Rule Types
         typedef x3::rule<string_literal_class> string_literal_type;
}
----8<----

* include/my/grammar_def.hpp:
----8<----
#include "my/grammar.hpp"
namespace parser {
         // Parser Declarations
         string_literal_type const string_literal { "string_literal" };
         // Parser Definition
         auto const string_literal_def =
         '"' > *graph > '"'
             ;
         // Definition
         BOOST_SPIRIT_DEFINE(string_literal)
}
----8<----

* include/my/config.hpp:
----8<----
namespace parser {
         typedef std::string::const_iterator iterator_type;
         typedef x3::unused_type context_type;
}
----8<----

* src/grammar.cpp:
----8<----
#include <eda/vhdl93/grammar_def.hpp>
#include <eda/vhdl93/parser_config.hpp>
namespace parser {
         BOOST_SPIRIT_INSTANTIATE(string_literal, iterator_type, 
context_type);
}
----8<----

* test/grammar_api.h:
----8<----
#include "my/grammar.hpp"
// Grammar Test Bench API Definition
namespace parser {
         BOOST_SPIRIT_DECLARE(string_literal_type);
}
parser::string_literal_type const& string_literal();
----8<----

* test/grammar_api.cpp
----8<----
// Grammar Test Bench API Definition
#include "grammar_api.hpp"
parser::string_literal_type const& string_literal() {
     return parser::string_literal;
}
----8<----

* test/main.cpp
----8<----
// using the string_literal() parser, not yet here
----8<----


The idea is not to expose all parsers into the client code, but make 
them exposed to the tests; inspired by test driven development.

How to organize it correct and avoid multiple instances? The grammar.hpp 
self is missing the top/entry rule, e.g. program, since I start with 
smaller production rules (bottom up design)

To fix the compiler error I have to include test/grammar_api.h in 
grammar_def.hpp. I guess these increases compile time later on and 
obviously shall be avoided.


Thanks,

Olaf



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