Boost Spirit X3 Symbol table parser segfaults when in a separate compilation unit

Hey, I am trying to learn how to break up Spirit X3 parsers into separate
reusable grammars, as encouraged by the example code (rexpr_full and calc
in particular) and the presentations from CppCon 2015 and BoostCon. This
question is originally asked on StackOverflow (
http://stackoverflow.com/questions/43679200/boost-spirit-x3-symbol-table-parser-segfaults-when-in-a-separate-compilation-uni),
but I am crossposting it here in the hopes of getting some good answers.

I have a symbol table (essentially mapping different types to a enum class
of the types I am supporting), which I would like to reuse in several
parsers. The only example of symbol tables I could find is the roman
numerals example, which is in a single source file.

When I try to move the symbol table into its own cpp/h file in the style of
the more structured examples my parser will segfault if I try to parse any
string which is not in the symbol table. If the symbol table is defined in
the same compilation unit as the parsers that use it throws an expectation
exception instead (which is what I would expect it to do).

I have made a small project which shows what I am trying to achieve and is
available here: https://github.com/sigbjornlo/spirit_fruit_mcve

My questions:
- Why does moving the symbol parser to a separate compilation unit cause a
segmentation fault in this case?
- What is the "correct" way of making a symbol table reusable in multiple
parsers? (In the MCVE I obviously only use the fruit parser in one other
parser, but in my full project I want to use it in several other parsers.

Sincerely,
Sigbjørn Lund Olsen

------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot

_______________________________________________
Spirit-general mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/spirit-general