Re: [PATCH v1 3/8] selftests/nolibc: select_null: fix up for big endian powerpc64

Hi Zhangjin,

On Wed, Jul 19, 2023 at 07:56:37AM +0800, Zhangjin Wu wrote:

It made me recalled I have at last disabled (not enabled for tinyconfig) the following options:

CONFIG_ALTIVEC
CONFIG_VSX --> This option enables kernel support for the Vector Scaler extensions

Or we can disable the vsx instructions explicitly:

-mno-vsx

Both of them work well, but I prefer -mno-vsx for to get a faster build, what about you?

+CFLAGS_powerpc64 = -m64 -mbig-endian -Wl,-EB,-melf64ppc -mno-vsx
+CFLAGS_powerpc64le = -m64 -mlittle-endian -Wl,-EL,-melf64ppc -mno-vsx

So, this patch itself is wrong, let's drop it from the next revision.

Better explicitly disable it in the CFLAGS (2nd option) if we want to make sure we don't want to rely on this, at least for portability purposes.

Willy