Re: ylwrap - flex filename weirdness

[Philip Herron]

On 31 October 2010 10:54, Jan Engelhardt <address@hidden> wrote:
> Hi,
>
>
> While trying to utilize Autotools in a preexisting project that
> previously just relied on Makefiles, I came across ylwrap failing for
> some absurd, unknown reason. I couldn't help but run sh -x and debug it
> piecewise.
>
> So what's ultimately done is running flex inside a temp directory,
>
>        flex /home/jengelh/code/iproute2/tc/emp_ematch_lex.l
>
> It turns out flex produces a file called lex.ematch_.c, which is
> something ylwrap so does not expect at all - it only checks for
> what's in pairlist="yy.lex.c emp_ematch_lex.c".
>
> I can use AM_LFLAGS = -o yy.lex.c to work around it, but that feels like
> an ugly hack. What's up with flex here?
>

Ylwrap renames your Lex and Yacc files to their respective <source
names.{c,h}> So if your lexer was foo.l it would output foo.c not
lex.yy.c which is what your expecting. Here is a Makefile.am snippet
of a basic compiler i write a while back:

bin_PROGRAMS= cmod$(EXEEXT)
noinst_LIBRARIES = libparser.a

AM_CPPFLAGS = -I$(top_srcdir)/include
AM_YFLAGS = -d

cmod_SOURCES = \
        mm-cmod.c \
        dd-util.c \
        dd-vec.c \
        ii-toplev.c \
        ii-mod-dot.c \
        bb-linux-i386.c

cmod_LDADD  = libparser.a

libcparser_a_YFLAGS = -d
libparser_a_CFLAGS = -DMOD -DPARSER
libparser_a_SOURCES = ss-parser.y ss-lexer.l

Hope this helps.

--Phil