Use precompiled openssl in C++ with vscode and mingw64 - c++

Question

I am trying to use the openssl library for my C++ code.
I was able to configurate the include path correctly, but when I compile my program there is still a linker issue -> C:/Users/felix/my_future/PMS_Blockchain_CPP/pms_blockchain/src/Wallet.cpp:77: undefined reference to `EVP_PKEY_CTX_new_id'
collect2.exe: error: ld returned 1 exit status
I am using mingw64 inside visual studio code, my task.json looks like this:
{
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: g++.exe build active file",
"command": "C:\\msys64\\mingw64\\bin\\g++.exe",
"args": [
"-fdiagnostics-color=always",
"-g",
"${workspaceFolder}\\pms_blockchain\\src\\**.cpp",
"${workspaceFolder}\\openssl\\**.h",
"-o",
"${workspaceFolder}\\${fileBasenameNoExtension}.exe"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": ["$gcc"],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "Task generated by Debugger."
}
],
"version": "2.0.0"
}
I think I have to add a new task for using the .lib files. I am not familiar with configurations like this, it already took me a lot of time to figure out how to create the existing task for compiling. I appreciate your help.

Answer 1

So with the help of drescherjm and his recommendation I was able to fix the issue. My problem was that I just made the configurations for using the header files in code, inside the c_cpp_properties.json file like this:
{
"configurations": [
{
"name": "Win32",
"includePath": [
"${workspaceFolder}/**",
"C:\\OpenSSL-Win64\\include"
],
"defines": [
"_DEBUG",
"UNICODE",
"_UNICODE"
],
"windowsSdkVersion": "10.0.19041.0",
"compilerPath": "C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30133/bin/Hostx64/x64/cl.exe",
"cStandard": "c17",
"cppStandard": "c++17",
"intelliSenseMode": "windows-msvc-x64",
"configurationProvider": "ms-vscode.makefile-tools"
}
],
"version": 4
}
But I didn't made the configuration for using the pre-build lib-files in the compiling process. Because the lib-files are containing the implementation for the header files, this is necessary. In the answer of the stackoverflow-link he provided, I was able to find the right commands to make the setup. Now my file is looking like this:
{
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: g++.exe build active file",
"command": "C:\\msys64\\mingw64\\bin\\g++.exe",
"args": [
"-fdiagnostics-color=always",
"-g",
"${workspaceFolder}\\pms_blockchain\\src\\**.cpp",
"-o",
"${workspaceFolder}\\${fileBasenameNoExtension}.exe",
"-L",
"${userHome}\\OpenSSL-Win64\\lib",
"-lssl",
"-lcrypto",
"${workspaceFolder}\\openssl\\**.h"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": ["$gcc"],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "Task generated by Debugger."
}
],
"version": "2.0.0"
}