openmp mingw mex for matlab error

i use Code block and my compiler environment is mingw 6.30.At the beginning, I created the following OpenMP code in the code block

There was no error

#include <iostream>
#include<omp.h>
#include<stdio.h>
#include<mex.h>
using namespace std;
int main()
{
	int A = 100;

#pragma omp parallel for lastprivate(A) firstprivate(A)
	for(int i = 0; i<10;i++)
	{

		A=A+i;
	}

	printf("%d\n",A);
	cout<<omp_get_active_level()<<"\n"；//this function omp_get_active_level() is compatible in cpp

	return 0;
}
code like this，i am sure that mingw6.30 gcc is compatible with openmp function like omp_get_active_level()
next setup，i want to change this code to mexfunction for matlab ，so code changed like this
#include <iostream>
#include<omp.h>
#include<stdio.h>
#include<mex.h>
using namespace std;
int test()
{
	int A = 100;

#pragma omp parallel for lastprivate(A) firstprivate(A)
	for(int i = 0; i<10;i++)
	{

		A=A+i;
	}

	printf("%d\n",A);
	cout<<omp_get_active_level()<<"\n"；//this function omp_get_active_level() is compatible in cpp

	return 0;
}

void mexFunction(int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[])
{
	test();
}

in matlab2020b，i select my matlab mex compiler mingw6.30 rather than vc++，but when i compile cpp to mex（i input mex -v COMPFLAGS="$COMPFLAGS -openmp" main.cpp），matlab warning like this

this makes me puzzles,because in code block,pure cpp project is compatible to run with omp_get_active_level,while in mex compiler,matlab warning this function undefined,after i delete omp_get_active_level,mex compiler show no error,why?whether matlab mexfunction support omp_get_active_level or not

[俊凯 王]

question can be sayed like this how to use mingw compiler to compile cpp project with openmp into mex file

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/279171-using-mingw-compiler-and-open-mp

[俊凯 王]

my project is cpp，is that ok ？let me have a try

[俊凯 王]

success！thanks