SIGIL for C++ Undefined References

Question

I am using SIGIL for C++ and am having an issue where every function call to a SIGIL function given an undefined reference error. I am using the example program, here is a copy of it:

#include "sl.h"

int main(int args, char *argv[])
{
  // set up our window and a few resources we need
  slWindow(400, 400, "Simple SIGIL Example", false);
  slSetFont(slLoadFont("ttf/white_rabbit.ttf"), 24);
  slSetTextAlign(SL_ALIGN_CENTER);
  int tex = slLoadTexture("png/glow.png");

  while(!slShouldClose() && !slGetKey(SL_KEY_ESCAPE))
  {
    // background glow
    slSetForeColor(0.1, 0.9, 0.2, 0.4);
    slSprite(tex, 200, 240, 300, 200);

    // large text and fat line
    slSetForeColor(0.0, 0.8, 0.2, 1.0);
    slSetFontSize(24);
    slText(200, 250, "SIGIL:");
    slRectangleFill(200, 240, 100, 7);

    // smaller subtext
    slSetFontSize(14);
    slText(200, 220, "Sprites, text, sound, input, and more!");
    slLine(48, 210, 352, 210);

    slRender();    // draw everything
  }
  slClose();       // close the window and shut down SIGIL
  return 0;
}

Here is the build log:


-------------- Build: Debug in Puzzle Fusion (compiler: GNU GCC Compiler)---------------

g++.exe -Wall -g -Iinclude -Ibin -c "C:\Users\Ninji2701\Desktop\Pile-o-Stuff\Puzzle Fusion\main.cpp" -o obj\Debug\main.o
g++.exe -Llib -o "bin\Debug\Puzzle Fusion.exe" obj\Debug\main.o   lib\libsigil.dll.a
obj\Debug\main.o: In function `main':
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:6: undefined reference to `slWindow'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:7: undefined reference to `slLoadFont'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:7: undefined reference to `slSetFont'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:8: undefined reference to `slSetTextAlign'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:9: undefined reference to `slLoadTexture'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:11: undefined reference to `slShouldClose'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:11: undefined reference to `slGetKey'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:14: undefined reference to `slSetForeColor'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:15: undefined reference to `slSprite'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:18: undefined reference to `slSetForeColor'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:19: undefined reference to `slSetFontSize'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:20: undefined reference to `slText'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:21: undefined reference to `slRectangleFill'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:24: undefined reference to `slSetFontSize'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:25: undefined reference to `slText'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:26: undefined reference to `slLine'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:28: undefined reference to `slRender'
C:/Users/Ninji2701/Desktop/Pile-o-Stuff/Puzzle Fusion/main.cpp:30: undefined reference to `slClose'
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minute(s), 0 second(s))
19 error(s), 0 warning(s) (0 minute(s), 0 second(s))

I am using minGW and have followed all instructions in the tutorial exactly.
What is causing this, and how can I fix it?
I have read the "duplicate question", and it is extremely general, and doesn't help me, as what I'm asking is a question about a very specific instance, and the answers to the other question do not help in this instance.

could you try adding an underscore to the imported functions and see if that makes a difference ? that is how the symbols are mangled in the import lib libsigil.dll.a for example : External| _slLoadFont and External| __imp__slLoadFont — Neelabh Mam, Sep 14 '20 at 06:27
@n-mam I tried it and I got the error `error: '_slWindow' was not declared in this scope` with the note: `note: suggested alternative: 'slWindow'` — DigitalDetective47, Sep 16 '20 at 20:28
The import library is for x86 so use x86 build tools. I just tried a simple build inmsvc without including sl.h. Instead, I introduced the below declaration and compiled and linked extern "C" __declspec(dllimport) void slWindow...; cl /c x.cpp link x.obj lib\libsigil.dll.a. It compiled and linked just fine. We could also dynamically link using loadlibrary and getprocaddress on the actual mangled address in the dll. — Neelabh Mam, Sep 17 '20 at 04:57
@n-mam I'm unclear as to what you're saying here. Also, as stated in the question, I use MinGW, not VSCode. — DigitalDetective47, Sep 17 '20 at 20:26
Instead of using sl.h try using this declaration : extern "C" __declspec(dllimport) void slWindow(........); — Neelabh Mam, Sep 19 '20 at 03:08
You are obviously doing something wrong. This works perfectly fine both for msvc as well as mingw. Furthermore, I don't see any issues with #include'ing sl.h.. that too complies fine. see my answer below for the link lines. — Neelabh Mam, Sep 20 '20 at 04:43

score 0 · Answer 1 · answered Sep 20 '20 at 04:43

From relative to the sigl extracted zip file use this:

gcc -Wall -g x.cpp -o x.exe -L./lib -lsigil.dll -lstdc++

to compile this:

#include <iostream>
//#include <sl.h>
extern "C" __declspec(dllimport) void slWindow(int width, int height, const char *title, int fullScreen);

int main(void)
{
  slWindow(400, 400, "Simple SIGIL Example", false);
  return 0;
}

and use this:

gcc -Wall -g x.cpp -o x.exe -L./lib -lsigil.dll -lstdc++ -I./include

to compile this:

#include <iostream>
#include <sl.h>
//extern "C" __declspec(dllimport) void slWindow(int width, int height, const char *title, int fullScreen);

int main(void)
{
  slWindow(400, 400, "Simple SIGIL Example", false);
  return 0;
}

SIGIL for C++ Undefined References

1 Answers1