Question

I am writing a operating system that needs to interface with some external assembler functions. I put the declaration in the header:

namespace Kernel
{
    class DescriptorTables
    {
        public:
        void init();
        void gdt_set_gate(s32int,u32int,u32int,u8int,u8int);
        private:
        extern void gdt_flush(u32int);
        struct gdt_entry_struct
        {
        //...

When the code is ran, it produces

DescriptorTables.h:10:31: error: storage class specified for ‘gdt_flush’

I have never seen this error before, Any ideas on how to fix this?

Answer 1

    extern void gdt_flush(u32int);

You can’t say extern like that within a class. extern is a storage class, which explains the message you’re seeing.