Not compiling

[JetSetIlly]

Hi,

I'm taking another look at this project after a couple of years. I'm still using a fork of inkyblackness/imgui-go but will be looking to move to cimgui-go for a new project.

I was surprised that the most version of the project des not compile on my Linux machine. I've ran a git bisect and the first problem commit is this one 17bd6d5

It looks to be a C++ problem, rather than a Go problem.

To identify the problem commit I ran make in the examples/glfw directory. The fail message when making glfw at commit 17bd6d5 is

go build -v -o example-glfw .
github.com/AllenDang/cimgui-go/imgui
# github.com/AllenDang/cimgui-go/imgui
../../imgui/funcs.go:1591:31: could not determine what C.ImGuiFreeType_GetBuilderForFreeType refers to
make: *** [Makefile:4: build] Error 1

As far as I can tell there are no good commits between 17bd6d5 and a2fc4c0 (tag v1.3.1)

The fail message when compiling a2fc4c0 is extensive:

a2fc4c0_errors.txt

I am using gcc (Debian 12.2.0-14+deb12u1) 12.2.0

[gucio321]

Hi! thank you for your report!
I'm trying to run on mentioned commit to check if I can reproduce.

1. could you try on actual main
2. Could you try to enforce CGO (CGO_ENABLED=1)
3. This might potentially also apply https://github.com/allendang/giu?tab=readme-ov-file#install-mingw-64

[gucio321]

okey, nevermind I can reproduce locally. So my solution is to use newer commit.

Edit You know, this seems to be some random commit (I even don't know if it isn't a part of some PR and whether things were even supposed to work)

Edit 2 Yes, this is the middle of #414 so you can't expect this commit to work

[JetSetIlly]

Edit You know, this seems to be some random commit (I even don't know if it isn't a part of some PR and whether things were even supposed to work)

It's what git bisect revealed to be the earliest commit where the problem occurs.

okey, nevermind I can reproduce locally. So my solution is to use newer commit.

Unfortunately, the latest commit in the main branch (61db89a) does not compile either.

61db89ad_errors.txt

[gucio321]

These are not the same errors 😊

check out this https://github.com/allendang/giu?tab=readme-ov-file#install-mingw-64

(The warning)

Tl;dr
You need to use more recent gcc version

[JetSetIlly]

These are not the same errors 😊

I know. Nothing after commit a2fc4c0 is compiling correctly on my Linux machine. The compile may fail for a different reason, which suggests there's a fundamental issue. Maybe the compiler version like you say.

check out this https://github.com/allendang/giu?tab=readme-ov-file#install-mingw-64
Tl;dr
You need to use more recent gcc version

I'm not using Windows, I'm using Linux to build a Linux binary so mingw32-w64 isn't involved at all. The version of GCC I'm using is v12.2.0. What features in a later GCC are required?

[gucio321]

Cimgui binaries were compound with newer gcc so mught be incompatible

[JetSetIlly]

Cimgui binaries were compound with newer gcc so mught be incompatible

Okay. I'll give the project a pass then. Good luck.

[gucio321]

This is #157

[gucio321]

Cimgui binaries were compound with newer gcc so mught be incompatible

After a deeper look, turns out it actually is not true. I'm so sorry for the confusion.

GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0

Here is what we use for cimgui.a.

Whats strange however is, that it works for me on arch linux with 15.1.1. I need to debug it a bit more.

[gucio321]

@JetSetIlly I can reproduce with the following setup

FROM debian:latest
RUN apt -y update
RUN apt -y install gcc g++ git wget make
RUN apt -y install libx11-dev libxcursor-dev libxrandr-dev libxinerama-dev libxi-dev libglx-dev libgl1-mesa-dev libxxf86vm-dev
RUN wget https://go.dev/dl/go1.24.4.linux-amd64.tar.gz
WORKDIR /
RUN tar xvf go1.24.4.linux-amd64.tar.gz
ENV PATH="/go/bin:${PATH}"
RUN git clone https://github.com/AllenDang/cimgui-go
WORKDIR /cimgui-go/examples/glfw

CMD /bin/bash

[gucio321]

ok, here is an in-depth explaination:

• the error is undefined reference to __isoc23_sscanf'`
• __isoc23_scanf refers to C++23 standard scanf function

this symbol was apperently added in glibc 2.38.
Ubuntu uses 2.39 while debian 2.36. I might be wrong but this seems to be the problem here.