Le 11/07/2022 à 18:39, Segher Boessenkool a écrit :

Hi!

On Mon, Jul 11, 2022 at 04:19:29PM +0200, Christophe Leroy wrote:

quoted

Commit 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
enlarged the CPU selection logic to PPC32 by removing depend to
PPC64, and failed to restrict that depend to E5500_CPU and E6500_CPU.
Fortunately that got unnoticed because -mcpu=8540 will override the
-mcpu=e500mc64 or -mpcu=e6500 as they are ealier, but that's
fragile and may no be right in the future.

A later -mcpu= always overrides an earlier one.  This is the same as
with all other GCC option flags, and will not change in the future.

By "future" I meant after patch 2.

At the time being, if you select PPC32 and MPC_85xx and E6500_CPU, you 
get -mcpu=e6500 -mcpu=8540.

After patch 2, if you select PPC32 and MPC_85xx and E6500_CPU, you get 
-mcpu=e6500

Christophe