I’m using AVX2 instruction to initialize static inline variables in my code. But the following does not compile.

#pragma GCC target("avx2")
class A {
    static inline __m256i mask = _mm256_set1_epi32(0xffffffff);
    ...
};
...

How do I make it compile?

The compiler says “AVX vector return without AVX enabled changes the ABI” although I’m using #pragma to enable AVX2. I also found that using -mavx2 as compile options successfully compiles the code.

I’m implementing montgomery reduction with simd intrinsics. I’ll use this to solve various problems in competitive programming sites. But I can’t change the compiler options in online judges. I have to rely only on source code. So, is there any way to compile the program without using the compiler argument -mavx2.