Hans Nieser wrote:
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 Makefile.am (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 :)
I do like this, but I don't know whether this is the best way to do it:
langdefscanner.cc: $(srcdir)/langdefscanner.ll
$(LEX) $(LFLAGS) -o $@ $(srcdir)/langdefscanner.ll
langdefparser.cc: $(srcdir)/langdefparser.yy
$(YACC) -p langdef_ -o $@ $(srcdir)/langdefparser.yy --defines=$*.h
and in the .ll I'm using the prefix option
--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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