Thanks for the info, Matthew,
On Thu, Apr 9, 2020 at 7:02 AM Matthew Flatt wrote:
> I think you probably have the "readline-gpl" package installed. That's
> where the "libreadline-5.dll" comes from in "private/readline-lib.rkt":
>
>
Yes. Prior to installing readline-gpl the file not found was
"libreadline-3.dll". The error message change from "-3.dll" to "-5.dll"
surprised me, and gave me hope that I was going in the right direction ...
> (define readline-library (ffi-lib "libreadline" '("5" "6" "4" "")))
>
I eventually found that line in ./7.6/share/readline-lib.rkt in the
directory given by (find-config-dir) and was wondering about the ordering.
Is 5,6,4 deliberate, or a typo and really should be 6,5,4?
>
> Even if "7" were added to that list, `ffi-lib` assumes a versioning
> convention that adds "-".
>
I added the "7" and of course discovered discovered the need for "-".
Would "bad things happen" if 'ffi-lib' (actually 'get-ffi-lib' in
ffi/unsafe.rkt) were changed to look for both "-" and no separator? i.e.
look for "-.dll" then ".dll"? Is there a standard for
the hyphen before the version that the cygwin package is breaking?
>
> One solution is to set the
>
> PLT_READLINE_LIB
>
> environment variable to point to the full path of "libreadline7.dll".
> Note that it will need to be a Windows path, though, not a Cygwin path.
>
Shortly after first posting I discovered PLT_READLINE_LIB.
In a cygwin session, adding the location of "libreadline7.dll" to the path,
and then setting PLT_READLINE_LIB was necessary only once. Subsequent
sessions apparently do not necessarily need the environment variable to be
set in order to find and load the ".dll". Is there some cache that is being
used once the ".dll" has been found and loaded the first time?
>
> Or you could also try copying "libreadline7.dll" to "libreadline.dll"
> (no "7") in the Racket's "lib" directory, but that probably won't work
> if "libreadline7.dll" depends on other libraries. And there's a
> question of whether a Cygwin libreadline will work at all when loaded
> into non-Cygwin Racket. It may work better to get another version of
> the libreadline DLL from somewhere and drop it into Racket's "lib"
> directory.
>
I'm not sure what to expect in a windows (i.e. non-cygwin) session. Indeed
I seem to be experiencing weird and inconsistent behaviour, and perhaps
need to experiment with minGW.
Cheers,
Kieron.
At Thu, 9 Apr 2020 00:49:11 -0600, K H wrote:
> > I'm running on cygwin on Windows 7 and I have the following error when
> > attempting to use the readline package:
> >
> > $ racket -il readline
> > Welcome to Racket v7.6.
> > ffi-lib: couldn't open "libreadline-5.dll" (The specified module could
> not
> > be found.; errid=126)
> > > ,ex
> >
> > I get the same error either from a cygwin bash prompt or from a windows
> cmd
> > shell prompt.
> >
> > The gnu readline installed appears to be at version 7.
> >
> > $ ls -l /usr/x86_64-w64-mingw32/sys-root/mingw/bin/libread*
> > -rwxr-xr-x /usr/x86_64-w64-mingw32/sys-root/mingw/bin/libreadline7.dll
> >
> > The source at ./share/pkgs/readline-lib/readline/rktrl.rkt seems relevant
> > but I'm not smart enough to figure out exactly what is wrong.
> >
> > Any ideas on how to continue to debug this?
> >
> > Thanks in advance,
> >
> > Kieron.
> >
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