Re: [PATCH 0/1] MR2434: include: Add memory clobber to GCC asm statement in NtCurrentTeb().

[Mateusz Wajchęprzełóż (＠mati271828)]

Wouldn't `volatile` be sufficient in this case?

**EDIT**: IMHO Adding a reference to a global variable as a memory input operand should solve the mentioned problem without preventing optimization too much.
```
static FORCEINLINE struct _TEB * WINAPI NtCurrentTeb(void)
{
    extern int dummy;
    struct _TEB *teb;
    __asm__(".byte 0x65\n\tmovq (0x30),%0" : "=r" (teb) : "m" (dummy));
    return teb;
}
```
GCC won't optimize away the asm invocations if there is a function call that could potentially modify the `dummy` variable (any function GCC can't prove it doesn't modify the `dummy` variable) between the asm invocations.