Segfault when using imgui example with c backend (default for nimble build)

[hansfbaier]

• What is the current behaviour?
  Trying to compile the imgui example
  https://github.com/nimgl/nimgl/blob/master/examples/timgui.nim
  from nimgui compiles successfully, but segfaults:

$ ./software 
Traceback (most recent call last)
/devel/HDL/src/kintex-mandelbrot/software/src/software.nim(78) software
/devel/HDL/src/kintex-mandelbrot/software/src/software.nim(38) main
/home/jack/.nimble/pkgs/nimgl-1.3.2/nimgl/imgui/impl_opengl.nim(147) igOpenGL3NewFrame
/home/jack/.nimble/pkgs/nimgl-1.3.2/nimgl/imgui/impl_opengl.nim(139) igOpenGL3CreateDeviceObjects
/home/jack/.nimble/pkgs/nimgl-1.3.2/nimgl/imgui/impl_opengl.nim(66) igOpenGL3CreateFontsTexture
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
[1]    25401 segmentation fault (core dumped)  ./software

• Please provide the steps to reproduce and if possible a minimal demo of the problem
  *install cimgui from https://github.com/cimgui/cimgui.git to /usr/local/lib

• What is the expected behaviour?
  application runs successfully

• Please tell us about your environment

  • Version: [ 0.3.6 ]
  • OS: [ Linux ]
  • Bindings: [ ImGui ]
  • Backend: [ C ]
  • Nim Version: [ 1.6.6 ]
  • Compiler used: [ GCC ]

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, docs.gl, documentation etc)

[xrfez]

Source language of ImGui is C++, since Nim is able to compile both to C
and C++ you can select which compile target you wish to use. Note that to use
the C backend you must supply a cimgui <https://github.com/cimgui/cimgui>_
dynamic library file.

Compilation of cimgui

[hansfbaier]

Yes I did supply the dynamic library.
But I worked around the issue by using nim's c++ backend,
then there is no segfault.
So for me the issue is not urgent, because I have a working solution.

[xrfez]

There is a way to static link with the c backend.

nimgl/imgui#9