Re: [Flex-devel] flex 2.5.33 under MSYS

[Julien L. <ju...@fa...>]

 >> x-post: mingw-dvlpr & flex-devel

On 21/04/2007 20:56, Will Estes wrote:
> Based on your comments, it looks like you could set an LDFLAGS variable
> to include -lregex, and then you wouldn't have to re-run the link
> command when building flex. Is that correct?

That was my first reaction to link libregex. Awkwardly, it doesn't work:
$ ./configure --prefix=/usr
$ make LDFLAGS='-lregex' flex.exe
gcc -g -O2 -lregex -o flex.exe  ccl.o dfa.o ecs.o gen.o main.o misc.o 
nfa.o parse.o scan.o skel.o sym.o tblcmp.o yylex.o options.o scanopt.o 
buf.o tables.o tables_shared.o filter.o regex.o -lm

Note where the LDFLAGS where inserted!

It would 'work' with the LIBS flag though, but I'm pretty sure it's not 
standard procedure to mess with LIBS:
$ make LIBS='-lregex' flex.exe
gcc  -g -O2   -o flex.exe  ccl.o dfa.o ecs.o gen.o main.o misc.o nfa.o 
parse.o scan.o skel.o sym.o tblcmp.o yylex.o options.o scanopt.o buf.o 
tables.o tables_shared.o filter.o regex.o -lregex

Anyway, if we don't insert libregex.a before regex.o, function regcomp 
from regex.o will be linked (and not the one from libregex.a) and this 
causes flex to crash:

julienlecomte@PUMILIO /srcroot/mingw/gnu/flex-2.5.33
$ ./flex.exe
regcomp()
regc(-100)
reg(0,1328)
regbranch(512)
regnode(6)
regnode(9)
regnode(0)
regtail(, )
regtail(, )
regnext()
regc(-100)
reg(0,0)
regbranch(0)
regnode(6)
regnode(9)
regnode(0)
regtail(♠, )
regnext(♠)
regtail(♠, )
regtail(        , )
regnext(        )
regnext(♠)
regtail(, )
regnext()
regnext(♠)
flex: fatal internal error, regcomp failed:

And if we omit regex.o, we of course get undefined errors:
$ gcc  -g -O2   -o flex.exe  ccl.o dfa.o ecs.o gen.o main.o misc.o nfa.o 
parse.o scan.o skel.o sym.o tblcmp.o yylex.o options.o scanopt.o buf.o 
tables.o tables_shared.o filter.o -lregex
main.o: In function `flexinit':
/srcroot/mingw/gnu/flex-2.5.33/main.c:974: undefined reference to 
`flex_init_regex'
filter.o: In function `filter_fix_linedirs':
/srcroot/mingw/gnu/flex-2.5.33/filter.c:344: undefined reference to 
`regex_linedir'
/srcroot/mingw/gnu/flex-2.5.33/filter.c:351: undefined reference to 
`regmatch_strtol'
/srcroot/mingw/gnu/flex-2.5.33/filter.c:352: undefined reference to 
`regmatch_dup'
/srcroot/mingw/gnu/flex-2.5.33/filter.c:376: undefined reference to 
`regex_blank_line'
collect2: ld returned 1 exit status

Cheers,
Julien