LNK11202 unresolved externals error despite #define STB_IMAGE_IMPLEMENTATION being used

[kakol20]

I am compiling using Visual Studio CMake and I keep getting the error despite the fact that I have #define STB_IMAGE_IMPLEMENTATION being defined in the .cpp file and not in the header file.

Every where I look all say that I cannot define it inside a header file but nothing has worked for me.

I have used stb_image before and it has worked. The only difference now is that I'm using CMake. In fact, I copied a class that was using stb_image from another project

Is there something I have to do in CMakeLists.txt? Am I missing something here?

[nothings]

Do this:
#define STB_IMAGE_IMPLEMENTATION
before you #include this file in one C or C++ file to create the implementation.

[kakol20]

Severity	Code	Description	Project	File	Line	Suppression State
Error	LNK2019	unresolved external symbol "public: __cdecl Image::Image(char const *)" (??0Image@@QEAA@PEBDH@Z) referenced in function main	\Image\out\build\x64-debug\Image Image\out\build\x64-debug\main.cpp.obj	1	

Severity	Code	Description	Project	File	Line	Suppression State
Error	LNK2019	unresolved external symbol "public: __cdecl Image::~Image(void)" (??1Image@@QEAA@XZ) referenced in function main	\Image\out\build\x64-debug\Image 	Image\out\build\x64-debug\main.cpp.obj	1

Severity	Code	Description	Project	File	Line	Suppression State
Error	LNK1120	2 unresolved externals  \Image\out\build\x64-debug\Image	\Image\out\build\x64-debug\Image.exe	1	

[rygorous]

That has nothing to do with stb_image, that's just a link error in your code.

[kakol20]

That has nothing to do with stb_image, that's just a link error in your code.

Well, I basically copied the Image class from another project of mine - and it works there. I have made zero modifications to the Image class itself.

I'm at the beginning of a new project and I included stb_image first. Right now, I am testing reading an image and I get this error

Image test("test.png");

[rygorous]

Well it looks like you're not including Image.cpp in the build at all, but I reiterate, that is a problem in your build setup and with your code and has nothing to do with stb_image in any way. We can't help you debug that.

[kakol20]

This was it. I did not realise that I had to to this:

add_executable (STB_Image "src/main.h" "src/main.cpp" "src/image/Image.cpp")

Visual Studio could recognise the macro when editing but when it came to compiling, it did not.

I included Image.h in main.h assuming that CMake would automatically add the class to the build