gnuplot 4.4 patchlevel 3 can't input international characters in interactive mode

[Z.X.Lyn]

I can't input chinese character in the interactive mode.a similar bug was found here:

https://bugs.launchpad.net/ubuntu/+source/gnuplot/+bug/377525

Why the bug was still "new" and "undicided" till now?

It seems that the bug was a compile configure error.
I compiled the 4.6 version of gnuplot with default configure option and it WORKS FINE with Chinese character.

Note that the

 ./configure --help

shows:
...
  --with-readline=builtin use the built-in readline
  --with-readline=gnu use the GNU readline library (default if present)
  --with-readline=bsd use the NetBSD editline library (NB: does not handle UTF-8!)
...
readline of bsd does not support UTF-8.

Hope this bug be fixed soon.

Best regards.
.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnuplot 4.4.3-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic i686
NonfreeKernelModules: wl fglrx
ApportVersion: 2.0.1-0ubuntu14
Architecture: i386
Date: Sat Oct 20 03:02:23 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
PackageArchitecture: all
SourcePackage: gnuplot
UpgradeStatus: Upgraded to precise on 2012-05-09 (163 days ago)

[Jason Conti (jconti)]

Unfortunately here the problem is that gnuplot cannot be linked against libreadline in Debian/Ubuntu because readline is GPL (see for instance /usr/share/doc/gnuplot/README.Debian). So instead gnuplot uses libedit which has poor support for non-ascii characters. There is a bug in Debian about improving the support, but it doesn't seem to have been looked at recently http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=273002

Looking at a similar bug in postgresql (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=608442) it seems as users we can workaround the issue without recompiling by using LD_PRELOAD. On my system, the following works (you would need to replace the path with the correct one on your system):

LD_PRELOAD=/lib/x86_64-linux-gnu/libreadline.so.6 gnuplot