Compilation failing related to lex.ll

[Daniel J Sebald]

John,

I'm trying to compile and have had a number of problems that seem to 
revolve around the lex.ll file and yacc/bison/gperf.  I see that you 
made a change within the past couple days.  Here is the short version of 
things, but I have detailed notes with errors, etc. if you would like me 
to email to you separately:

1) I kept running configure until all but FFTW3, FFTW3F, and OpenGL were 
utilized.
2) Upon compiling, error on something requiring flex.  Looked at 
config.log and see that flex is not present.  Installed flex, 
reconfigured.  configure passed, but not cleanly as I see the following:

configure:59019: gcc -o conftest -g -O2 -pthread   conftest.c  -lm   >&5
/tmp/ccJsdEZe.o: In function `input':
/usr/local/src/octave/octave/lex.yy.c:1168: undefined reference to `yywrap'
/tmp/ccJsdEZe.o: In function `yylex':
/usr/local/src/octave/octave/lex.yy.c:867: undefined reference to `yywrap'
/tmp/ccJsdEZe.o: In function `main':
/usr/local/src/octave/octave/conftest.l:17: undefined reference to `yywrap'
collect2: ld returned 1 exit status
configure:59019: $? = 1
configure: failed program was:
| /* confdefs.h */


3) Upon compiling, error on something requiring gperf.  Checked 
config.log and see it is missing, installed gperf, reconfigured. 
configure passed.
4) Recompiled and there are 100+ errors with what seem like missing 
macros in octave.gperf as included from lex.cc or lex.ll, however that 
works.
5) I installed bison, and that didn't seem to change anything.

I did some searching and poking around.  Maybe some of the following 
scraps will help you.  If you need more details, let me know.

Dan

++++++

Inside of the lex.ll file I see:

// Include these so that we don't have to link to libfl.a.

int
yywrap (void)
{
  return 1;
}

Is this what is causing ./configure to fail the conftest?

++++++

Inside lex.ll is this comment:

// These would be alphabetical, but y.tab.h must be included before
// oct-gperf.h and y.tab.h must be included after token.h and the tree
// class declarations.  We can't include y.tab.h in oct-gperf.h
// because it may not be protected to allow it to be included multiple
// times.

by there is no y.tab.h in the list of files.  Is this comment obsolete? 
 Has y.tab.h been moved and inherently now after oct-gperf.h which is 
the source of the 100+ errors I'm seeing?

++++++

Old references:

http://octave.1599824.n4.nabble.com/Re-Octave-in-CVS-has-busted-configure-td1642655.html#a1642657

http://comments.gmane.org/gmane.comp.gnu.octave.general/27886