[syslog-ng] Syslog 1.6.8 compile error

[Roberto Nibali]

> gcc  -g -O2 -Wall -I/usr/local/include/libol -D_GNU_SOURCE   -o syslog-ng  main
> o sources.o center.o filters.o destinations.o log.o cfgfile.o cfg-grammar.o cfg
> lex.o affile.o afsocket.o afunix.o afinet.o afinter.o afuser.o afstreams.o afpr
> gram.o afremctrl.o nscache.o utils.o syslog-names.o macros.o  -lnsl -lresolv  /
> sr/local/lib/libol.a -lnsl -Wl,-Bstatic      -Wl,-Bdynamic
> cfg-lex.o(.text+0x45f): In function `yylex':
> /root/rpm/syslog-ng/syslog-ng-1.6.8/src/cfg-lex.c:1123: undefined reference to
> yywrap'
> cfg-lex.o(.text+0xb33): In function `input':
> /root/rpm/syslog-ng/syslog-ng-1.6.8/src/cfg-lex.c:1450: undefined reference to
> yywrap'

As previously noted by another poster this is a problem with the flex
version on your system. If you use a flex with a higher version than
2.5.4 you're out of luck, unless you patch the sources. The reason for
this is that the people developing flex had the "interesting" idea of
changing the way the lexer parses the language file.

The fix is to downgrade your flex or to patch cfg-lex.l with a %option
field disabling yywarp. From the top of my head it should read:

%option noyywrap

Or you define the options as follows (I think):

%{
prototype functionname(parameters);
%}

Just my 2 cents since this issue turns up on almost every OSS project
out there and people hit this very problem all the time and I thus want
to enlarge the information and have google find it once and forever ;).

[google ahoi: linux-ha-dev mailinglist, syslog-ng mailinglist]

Best regards,
Roberto Nibali, ratz

ps.: Let's hope I got it right
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