A short example of showing volatile makes my_struct_t a non-literal type.

literal-type-check.cpp

// Put this gist in Matt Godbolt's Compiler Explorer
// Compiler: ARM GCC 6.3
// Options: -std=c++14

#include <cstdint>
#include <type_traits>

typedef struct
{
    volatile uint32_t variable1; // Remove volatile, and the condition passes
    uint32_t variable2;
} my_struct_t;

int main()
{
    static_assert(std::is_literal_type<my_struct_t>::value, "Not a literal type");
}