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ocamlbuild, menhir and keeping tokens in a separate file
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Date: -- (:)
From: Joel Reymont <joelr1@g...>
Subject: Re: [Caml-list] Re: ocamlbuild, menhir and keeping tokens in a separate file

On May 2, 2007, at 2:08 PM, Nicolas Pouillard wrote:

> You can generate these rules:
>
> let mk_ext_token parser token =
>  flag ["ocaml"; "menhir_ocamldep"; "file:"^parser^".mly"]
>    (S[A"--external-tokens"; A token; A(token^".mly")]);
>  flag ["ocaml"; "parser"; "menhir"; "file:"^parser^".mly"]
>    (S[A"--base"; A parser]);

What would I need to put in my _tags file to use the above? I just  
have this for now:

"EasyToken.mly": only_tokens
"EasyParser.mly": token_base, ext_tokens

>> Error: EasyToken.mly: No such file or directory
>>
> From here I don't know why it fails...

It fails because EasyToken.mly has not been copied to _build. How do  
I force a copy?

For now I have to use "../EasyToken.mly" below

flag ["ocaml"; "parser"; "menhir"; "ext_tokens" ] (S[A"--external- 
tokens";
                                                      A"EasyToken";
                                                      A"../ 
EasyToken.mly";
                                                     ]);

Still, there's something wrong with dependencies

ocamlbuild Test.byte
+ /usr/local/bin/menhir --ocamlc 'ocamlfind ocamlc -package ounit' -- 
explain --external-tokens EasyToken ../EasyToken.mly --base  
EasyParser --infer EasyParser.mly
File "EasyParser.mly", line 54, characters 27-44:
Unbound type constructor EasySymtab.symbol

The problem is that EasySymtab has not been compiled yet. _build/ 
EasyParser.mly.depends is size 0 which is wrong since EasyParser.mly  
opens a bunch of modules. I tried this a couple of times from scratch  
and it's always size 0.

The tail of the log file below shows that ocamlbuild runs  
dependencies on EasyLexer but proceeds to compile EasyParser without  
figuring out its dependencies.

# Target: EasyLexer.mll, tags: { extension:mll, file:EasyLexer.mll,  
lexer, ocaml, ocamllex, quiet, traverse, use_menhir }
/usr/local/bin/ocamllex.opt -q EasyLexer.mll # cached

# Target: EasyLexer.ml.depends, tags: { extension:ml,  
file:EasyLexer.ml, ocaml, ocamldep, quiet, traverse, use_menhir }
/usr/local/bin/ocamldep.opt -modules EasyLexer.ml >  
EasyLexer.ml.depends # cached

# Target: EasyParser.mly, tags: { ext_tokens, extension:mly,  
file:EasyParser.mly, menhir, ocaml, parser, quiet, token_base,  
traverse, use_menhir }
/usr/local/bin/menhir --ocamlc 'ocamlfind ocamlc -package ounit' -- 
explain --external-tokens EasyToken ../EasyToken.mly --base  
EasyParser --infer EasyParser.mly


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