gnuplot (including wgnuplot) is unusable.

[MehdiChinoune]

Description / Steps to reproduce the issue

Type gnuplot in terminal, It closes without showing anything.
wgnuplot shows a GUI but commands are not visible.

Expected behavior

To be usable

Actual behavior

Described above.

Verification

• I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

Windows Version

MINGW64_NT-10.0-19045

MINGW environments affected

• MINGW64
• MINGW32
• UCRT64
• CLANG64
• CLANGARM64

Are you willing to submit a PR?

Maybe packaging gnuplot the way It's packaged by the upstream, using Makefile instead of autotools.

[mmuetzel]

It seems to be working when invoked by Octave (tested in MINGW64 and UCRT64 environments).

Steps to reproduce:

• install Octave and gnuplot, e.g., with pacboy -S octave:p gnuplot:p
• start Octave with octave
• switch to gnuplot graphics with graphics_toolkit gnuplot (ignore the deprecation warning)
• open a plot, e.g., with plot ([0 1]). (The plot window opens off-screen for some reason. But if I move it on-screen, it looks fine albeit slightly blurry.)
  

[mmuetzel]

Since gnuplot is working when it is controlled through a pipe (e.g., in Octave), but it isn't working from the command line, it might be an issue with how gnuplot uses readline.

Additionally, there seems to be a relocation issue pointed out in this (otherwise unrelated) thread:
https://octave.discourse.group/t/ci-stuck-after-make-check-on-windows/6097/3

  json\jsonencode.tst ............................................ pass   54/54   [ 0.109s /  0.109s]
Can't find PostScript prologue file prologue.ps
	loadpath is empty
	gnuplotrc is read from D:/a/msys64/mingw64/share/gnuplot/6.0
Please copy prologue.ps to one of the above directories
or set the environmental variable GNUPLOT_PS_DIR
or set the loadpath appropriately
         line 0: Plot failed!