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Re: [Bug-gnulib] AC_PROG_YACC


From: Derek Robert Price
Subject: Re: [Bug-gnulib] AC_PROG_YACC
Date: Mon, 03 May 2004 14:58:49 -0400
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Bruno Haible wrote:

>Derek Robert Price wrote:
>
>>>>>My workaround will be to just stick a `YFLAGS=' line in my
>>>>>Makefile.am, but I thought you might like the bug report.
>>>>
>>>>So this means, YFLAGS is meant as a variable through which the
user can
>>>>influence the compilation (like CFLAGS, CPPFLAGS, LDFLAGS etc.). By
>>>>setting it to empty, you give the user less freedom.
>>
>>Not true.  I am _defaulting_ it to empty by setting it via configure.
>
>
>That's reasonable, but for this to work as you expect, the default must
>be set from configure.ac or a .m4 macro, not from Makefile.am.


The patch I submitted with the last email did this in m4/bison.m4 from
GNULIB.

>>My new solution just AC_ARG_VARs both YACC & YFLAGS
>
>
>Sounds OK for YFLAGS. However, for YACC it's not what we want because it
>doesn't enforce the requirement that bison is used.


It's as effective as the:

>  : ${YACC='bison -y'}
>  AC_SUBST(YACC)


that GNULIB's m4/bison.m4 is currently using.  I would argue that my
AC_AARG_VAR version is actually more effective for preserving the use
of overrides in subsequent runs of configure.  Also for ducumenting
the possibility of an override.

I would also cite your argument for maintaining flexibility by
allowing user overrides.  The patch I sent also provides a warning via
`./configure --help' that setting the value of YACC to something other
than `bison -y' is likely to cause problems.

Derek

- --
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