C++ error: intrinsic function was not declared in scope

I want to compile code that uses the intrinsic function _mm256_undefined_si256() (returns a vector of 8 packed double word integers). Here is the reduced snipped of the affected function from the header file:

// test.hpp#include "immintrin.h"namespace {    inline __m256i foo(__m256i a, __m256i b) {        __m256i res = _mm256_undefined_si256();        // some inline asm stuff        // __asm__(...);        return res;    }}

Compiling via gcc -march=native -mavx2 -O3 -std=c++11 test.cpp -o app throws the following error >>_mm256_undefined_si256<< was not declared in this scope.

I can not explain why this intrinsic function is not defined, since there are other intrinsics used in the header file which work properly.