Re: Bison/flex yywrap error during configure test

[Daniel J Sebald]

On 09/09/2014 12:34 AM, Daniel J Sebald wrote:
> Oh yeah, I also wanted to point out that although I have the most recent
> Bison and flex I'm still seeing an error in the test during
> configuration. From the file config.log:
>
> configure:7824: checking lex library
> configure:7838: gcc -o conftest -g -O2 conftest.c >&5
> /tmp/ccmYrPKQ.o: In function `input':
> /usr/local/src/octave/octave-background_command/build3/lex.yy.c:1172:
> undefined reference to `yywrap'
> /tmp/ccmYrPKQ.o: In function `yylex':
> /usr/local/src/octave/octave-background_command/build3/lex.yy.c:870:
> undefined reference to `yywrap'
> /tmp/ccmYrPKQ.o: In function `main':
> /usr/local/src/octave/octave-background_command/build3/conftest.l:17:
> undefined reference to `yywrap'
> collect2: ld returned 1 exit status
> configure:7838: $? = 1
> configure: failed program was:
> | /* confdefs.h */
>
> Is there a way to make this test pass by using one of the alternatives
> here:
>
> http://stackoverflow.com/questions/1811125/undefined-reference-to-yywrap
>
> i.e., the "%option noyywrap" or linking using the default yywrap()
> function? The latter seems a little easier to do in the 'configure'
> scripts.

Actually, I think this is supposed to fail.  It's part of the process of 
figuring out what libraries are needed to make flex generated files 
compile.  Wish it would suppress printing out the failed file though, 
which in this case is rather large.  The AC/etc tools are just too much 
to tackle.

Dan