Re: RFC: build: be robust to missing flex

[Akim Demaille]

Le 27 mars 2012 à 16:27, Stefano Lattarini a écrit :

> On 03/27/2012 04:16 PM, Akim Demaille wrote:
>> 
>> [BIG SNIP]
>> 
>> diff --git a/configure.ac b/configure.ac
>> index 622da5d..5c97683 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -110,6 +110,9 @@ AC_SUBST([YACC_LIBRARY])
>> 
>> # Checks for programs.
>> AC_PROG_LEX
>> +if $LEX --version 2>/dev/null | $EGREP 'f?lex 2\.5\.3' >/dev/null; then :; 
>> else
>> +  AC_MSG_ERROR([flex 2.5.3* is required])
>> +fi
>> 
> I think the best fix in the long term would be to enhance AC_PROG_LEX to set
> a variable telling whether $LEX is flex or not (similarly to what is done by
> AC_PROG_CC etc.).  The Bison's configure could simply use this variable to
> determine whether a good-enough flex has been found.
> 
> Would you think it worthwhile to submit a patch to Autoconf before 2.69 gets
> released?

Good idea, why not!  I'll try to spend some time on this
during the week.  Thanks for the prompt.