This question already has an answer here:
why my code is showing error undefined reference to `WinMain#16'?
(1 answer)
Closed 3 months ago.
How to fix the following error message when trying to compile C++ console application project on Code::Blocks?
undefined reference to `WinMain'
All other questions on Stack Overflow are about "WinMain#16", which is not the case here.
WinMain is linked to in windows when you want to create a windows application.
https://learn.microsoft.com/en-us/windows/win32/learnwin32/winmain--the-application-entry-point
For the complier to look for the main function you will have to change at the linker stage that it is a console application and not a windowed one.
Or you might just need to restart CodeBlocks:
C++ undefined reference to WinMain#16 (Code::Blocks)
Or you might have just have deleted main() ;)
Related
This question already has answers here:
undefined reference to `WinMain#16'
(7 answers)
wWinmain, Unicode, and Mingw
(3 answers)
Closed 9 months ago.
I've been attempting to follow this guide here for writing a program in C++ that allows me to create an application window, however I ran into an issue where whenever I used Run Build Task with MinGW-w64 on the example code provided on the page linked above, I keep running into this same error.
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../libmingw32.a(main.o):(.text.startup+0xc0): undefined reference to 'WinMain#16'
collect2.exe: error: ld returned 1 exit status
The important part of that bit is the undefined reference to 'WinMain#16' at the end. Apparently because the sample code I tried uses wWinMain instead of WinMain, MinGW can't find any entry point? So this would mean I can't use MinGW if I want to run this code. So what do I do instead? What compiler would actually work for compiling wWinMain?
This question already has answers here:
What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Closed 1 year ago.
I am learning opengl and decided to use imgui to an working existing opengl cmake project by adding following files in the project:
target_sources(Application PRIVATE
vendor/include/imgui/imgui.cpp
vendor/include/imgui/imgui_draw.cpp
vendor/include/imgui/imgui_impl_glfw.cpp
vendor/include/imgui/imgui_impl_opengl3.cpp
vendor/include/imgui/imgui_widgets.cpp
vendor/glad/glad.c
vendor/include/stb_image/stb_image.c
src/Indexbuffer.cpp
src/Shader.cpp
src/Texture.cpp
src/Vertexarray.cpp
src/Vertexbuffer.cpp
)
while this works fine on windows but when i build it in linux linker shows error saying:
in function `ImGui_ImplOpenGL3_Init(char const*)':
imgui_impl_opengl3.cpp:148: undefined reference to `glGetIntegerv'
imgui_impl_opengl3.cpp:230: undefined reference to `glEnable'
imgui_impl_opengl3.cpp:231: undefined reference to `__glewBlendEquation'
all other glfw and opengl functions are working in my application.cpp it only breaks when i add imgui files to the project.
the problme is not imgui but the lib glfw and glew. so it seem you have not link the libs
This question already has answers here:
What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Closed 11 months ago.
#include<graphics.h>
#include<stdio.h>
main()
{
int gd=DETECT,gm;
int i,x,y;
initgraph(&gd,&gm,"");
line(0,0,640,0);
line(0,0,0,480);
line(639,0,639,480);
line(639,479,0,479);
for(i=0;i<=1000;i++)
{
x=rand()%639;
y=rand()%480;
putpixel(x,y,15);
}
getch();
closegraph();
}
The Following is a Basic Graphic Program,It Shows the Errors as
undefined reference to 'initgraph'
undefined reference to 'closegraph'
undefined reference to 'line'[4 times]
undefined reference to 'putpixel'
Compiler : CodeBlocks; Language:c++;
I Have Copied the graphics.h and winbgim.h in include folder and the libbgi.a in the lib folder also i have linked all the libraries required to be linked. Please Help.
Change
initgraph(&gd,&gm,"");
to
initgraph(&gd,&gm,NULL);
for compiling:
g++ -o filename filename.cpp -lgraph
to execute:
./filename
The functions in graphics.h are only supported by old ancient Turbo C and Turbo C++ compilers. Those functions can not be used by any modern 32-bit compiler. You can either get a copy of that old MS-DOS compiler or use win32 api GDI functions or get one of several graphics libraries such as OpenGL and QT.
This question already has answers here:
undefined reference to `WinMain#16'
(7 answers)
What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Closed 8 years ago.
I always get this error 'Undefined reference to WinMain#16' after creating a class in Code::Blocks. I have to restart it to make the program works.
Why ?
Thank you!
If you have only one file - your class - and you trying to compile it, you will get this error because file don't have int main() function. It's required by linker to create executable (start point of program).
If you have project with classes, you must have one main function, for example in main.cpp file :)
Also, check that you selected a Console application - GUI (Windows application) neeed WinMain function instead of classical main.
Of course, this is about normal program - library have other requirements.
This question already has answers here:
What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Closed 7 years ago.
The compiler throws errors like:
" [Linker error] main.o:main.cpp:(.text+0x972): undefined reference to `_imp__glutReshapeFunc#4' "
Do you know how to use GLUT in Dev C++?
DevC++ is seriously outdated. I recommend using Codeblocks instead.
The error line you quoted simply indicated, that the linker is missing the functions of the GLUT library. Including the headers is not enough (they just provide the compiler with sort of an index). But the linker still needs to be told which libraries to actually link against.