[PATCH] powerpc: Enable demuxed sysv IPC syscalls

[Adhemerval Zanella]

On 03-12-2015 20:22, Joseph Myers wrote:
> On Thu, 3 Dec 2015, Adhemerval Zanella wrote:
> 
>> My inclination would to avoid the __ASSUME_XXX macros definition and just
>> check if the current kernel header defines of not __NR_msgctl and use it
>> as the condition to enable the wire-up syscall.
> 
> I'm not clear exactly what you're suggesting.  If you check like that 
> (whether the kernel headers, possibly for a newer kernel than the minimum 
> supported by that glibc build, define a syscall number) then you need a 
> run-time fallback if the new syscall fails with ENOSYS.
> 

But building with a newer kernel header will bind the libc.so to the
specific version, isn't? I am assuming ENOSYS will be retuned only when
the libc.so issues the syscall on an older kernel (which it should not
suppose to support).