On Mon, Aug 01, 2016 at 04:22:37PM +1000, Brendan O'Dea wrote: > On Sun, Jul 31, 2016 at 03:40:14PM -0400, Thomas Dickey wrote: > >I normally don't build with "new" flex, but took a look today and had > >no problem building with the version in testing (which appears to match > >that in experimental). > > > >What is the problem that you are seeing when building? > > The problem is not with building, but that the resulting .so refers to, but > doesn't define the whatever_wrap() function, so dynamic linking fails. > > configure doesn't cope with the new version in so far as to say that it > expects to find flex >= 2.5 and <= 2.6, but the substitution on line 259 of > configure.in doesn't cope with 2.6: > > sed -e 's/^2.5.// > > resulting in this output from configure: > > checking version of flex... 2.6.0 > ../configure: 5316: test: Illegal number: 2.6.0
I did notice that yesterday, but since it built, didn't look too closely.
> at the time I didn't look too deeply, but just figured that it was simplest to
> go back to flex-old (2.5.4) and will probably just stick with that for now.
>
> For reference, I ran configure with flex-old (2.5.4), the newest version of
> flex I could find in the archive >= 2.5 (2.5.39), and the current version
> (2.6.0). I then generated mailfilt.c for each. See attached.
>
> All three produced an identical config.h.
>
> I suspect that the actual problem is this code in filters/filters.h (line
> 157):
>
> #if defined(FLEX_SCANNER) && defined(FLEX_BETA)
...so after ten years, it's no longer a beta. I can fix this :-)
> #define YY_SKIP_YYWRAP
> #define yywrap() private_yywrap()
> #define USE_LEXWRAP(name) static int private_yywrap(void) { return 1; }
> #else
> #define USE_LEXWRAP(name) /* nothing */
> #endif
>
> which doesn't choose the first case on 2.6.0, since FLEX_BETA is not defined.
> See this fragment from the generated mailfilt.c:
>
> #define FLEX_SCANNER
> #define YY_FLEX_MAJOR_VERSION 2
> #define YY_FLEX_MINOR_VERSION 6
> #define YY_FLEX_SUBMINOR_VERSION 0
> #if YY_FLEX_SUBMINOR_VERSION > 0
> #define FLEX_BETA
> #endif
>
> the equivalent code for 2.5.x works since YY_FLEX_SUBMINOR_VERSION is
> non-zero.
>
> Out of curiosity, why does USE_LEXWRAP take an option? It doesn't appear to
> do anything with it.
It's used a little later in filters.h:
/*
* We'll put a DefineFilter() in each filter program. To handle
special cases
* such as c-filt.c, use DefineOptFilter().
*/
#define DefineOptFilter(name,options) \
USE_LEXWRAP(name##_wrap) \
static void init_filter(int before); \
static void do_filter(FILE *Input); \
DCL_LEXFREE \
FILTER_DEF filter_def = { #name, 1, init_filter, do_filter, options
REF_LEXFREE }
and FILTER_DEF is used in builtflt.c (the main programs list of linkages).
--
Thomas E. Dickey <[email protected]>
http://invisible-island.net
ftp://invisible-island.net
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