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Re: Problems with linking multiple lex/yacc parsers into one executable

From: Hans Nieser
Subject: Re: Problems with linking multiple lex/yacc parsers into one executable
Date: Sun, 17 May 2009 02:38:26 +0200

On Sat, 2009-05-16 at 23:06 +0200, Hans Nieser wrote:
> Hi list,
> I recently started using lex/yacc and I'm having some trouble figuring
> out how to make it possible to link two parsers into the same executable
> using automake.

I did some more googling and it turns out that although there is an
option that I can specify in the lex file itself to use a different
prefix for symbols [1], it will actually affect the output filename as
well which seems to break the ylwrap script (it fails silently, but I am
guessing it's because of the different filename).

Another complication of compiling the lex C source directly is that I'd
also need to make yacc produce the header file and include it in the lex
source, which I guess means I have to add some explicit dependencies in
my (actually I'm not sure how that works at all since ylwrap
is called in a subdirectory?.. hmm)

I've now just resorted to the following, I'm not sure if it's the best
way to go but it seems to work and is hopefully still portable:

bin_PROGRAMS = foo

foo_sources = foo.c parser1_yacc.y

parser1_yacc.c: parser1_lex.c

parser1_lex.c: parser1_lex.l
        $(LEX) -o parser1_lex.c parser1_lex.l

I'm not really sure if I can mix and match explicit make rules like
this, hopefully someone can tell me if there's anything terribly wrong
with doing it this way :)


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