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When I try to use Assimp together with stb it says that some functions are already defined and it will not link.

CMakeLists.txt

cmake_minimum_required(VERSION 3.20)
project(TestProject)

add_executable(TestProject "main.cpp")

set(BUILD_SHARED_LIBS OFF)
add_subdirectory("vendor/assimp")

target_include_directories(TestProject PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/vendor/stb")
target_include_directories(TestProject PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/vendor/assimp/include")
target_include_directories(TestProject PUBLIC "${CMAKE_CURRENT_BINARY_DIR}/vendor/assimp/include")

target_link_libraries(TestProject PUBLIC assimp)

main.cpp

#include <iostream>
#include "assimp/Importer.hpp"
#include "assimp/scene.h"
#include "assimp/postprocess.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

int main(){
    std::cout << "Hello World" << std::endl;

    int width, height, nrChannels;
    uint8_t* data = stbi_load("image.jpg", &width, &height, &nrChannels, 0);

    Assimp::Importer importer;

    stbi_image_free(data);
    std::cin.get();
}

This is the output I got from this. It seems like a few functions from the stb file could not be linked correctly.

4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_from_memory already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_from_callbacks already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_from_file already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_gif_from_memory already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_16_from_memory already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_16_from_callbacks already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_16 already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_load_from_file_16 already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_loadf_from_memory already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_loadf_from_callbacks already defined in main.obj
4>assimp-vc142-mtd.lib(PbrtExporter.obj) : error LNK2005: stbi_loadf already defined in main.obj
...

I'm building from the source files.

AltaDigga
  • 23
  • 4
  • I want to use the source to stay always updated. – AltaDigga May 24 '21 at 19:50
  • Now that I see the errors I think this is related: [https://stackoverflow.com/questions/43348798/double-inclusion-and-headers-only-library-stbi-image](https://stackoverflow.com/questions/43348798/double-inclusion-and-headers-only-library-stbi-image) – drescherjm May 24 '21 at 19:53
  • My guess is you want to put `#define STB_IMAGE_IMPLEMENTATION` before the assimp includes in your main.cpp file. My guess is these headers already include parts of stb. – drescherjm May 24 '21 at 19:54

0 Answers0