Having including the path of folder iir and Iir.h in VS code but the terminal still goes wrong

[HongyuanChen]

Sorry to interrupt everybody. I have installed the package and want to use it in vs code (Ubuntu 18.04).

I have add the include path in c_cpp_properties.json ( both the iir folder and the path including the Iir.h) ,When debugging , the terminal went wrong with :
/tmp/ccb3wt3i.o：在函数‘Iir::Butterworth::LowPass<2, Iir::DirectFormII>::setup(double, double)’中：
/usr/include/iir/Butterworth.h:156：对‘Iir::Butterworth::LowPassBase::setup(int, double)’未定义的引用
collect2: error: ld returned 1 exit status

the terminal in chinese(未定义的引用) could be translated to ( undefined reference)。

When I search how to fix it , Some tell me that I should include the .cpp about the iir in task.json .But I can't find them.

[HongyuanChen]

I have added the path of libiir.so in task.json still went wrong, So sad . How can I fix this problem?

// See https://go.microsoft.com/fwlink/?LinkId=733558
// for the documentation about the tasks.json format
"version": "2.0.0",
"tasks": [
{
"label": "build", // 任务名称，与launch.json的preLaunchTask相对应
"type": "shell", // 可以为shell或process，前者相当于先打开shell再输入命令，后者是直接运行命令
"command": "g++", // 要使用的编译器, C就写gcc
"args": [
"-g", "${file}", "-std=c++11",
"-o", "${fileBasenameNoExtension}.out",
"-L/usr/lib/x86_64-linux-gnu",
"-liir"
]
}
]

[Bernd Porr]

Sorry I don't give support of how to use an IDE. Best of luck.