On Sunday 28 August 2022 17:43:53 Christophe Leroy wrote: > Le 28/08/2022 à 19:41, Pali Rohár a écrit : > > On Sunday 28 August 2022 17:39:25 Christophe Leroy wrote: > >> Le 28/08/2022 à 19:33, Christophe Leroy a écrit : > >>> > >>> > >>> Le 28/08/2022 à 11:56, Pali Rohár a écrit : > >>>> When CONFIG_TARGET_CPU is specified then pass its value to the compiler > >>>> -mcpu option. This fixes following build error when building kernel with > >>>> powerpc e500 SPE capable cross compilers: > >>>> > >>>> BOOTAS arch/powerpc/boot/crt0.o > >>>> powerpc-linux-gnuspe-gcc: error: unrecognized argument in option > >>>> ‘-mcpu=powerpc’ > >>>> powerpc-linux-gnuspe-gcc: note: valid arguments to ‘-mcpu=’ are: > >>>> 8540 8548 native > >>>> make[1]: *** [arch/powerpc/boot/Makefile:231: > >>>> arch/powerpc/boot/crt0.o] Error 1 > >>> > >>> corenet64_smp_defconfig : > >>> > >>> BOOTAS arch/powerpc/boot/crt0.o > >>> powerpc64-linux-gcc: error: missing argument to '-mcpu=' > >>> make[1]: *** [arch/powerpc/boot/Makefile:237 : arch/powerpc/boot/crt0.o] > >>> Erreur 1 > >>> make: *** [arch/powerpc/Makefile:253 : uImage] Erreur 2 > >>> > >>> > >> > >> Seems like in fact, E5500_CPU and E6500_CPU are not taken into account > >> in CONFIG_TARGET_CPU, and get special treatment directly in > >> arch/powerpc/Makefile. > >> > >> This goes unnoticed because of CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += > >> $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU)) > >> > >> I think we need to fix that prior to your patch. > > > > It looks like that CONFIG_TARGET_CPU is broken. > > > > $ make ARCH=powerpc corenet64_smp_defconfig > > CROSS_COMPILE=powerpc64-linux-gnu- > > ... > > # configuration written to .config > > > > $ grep CONFIG_TARGET_CPU .config > > CONFIG_TARGET_CPU_BOOL=y > > > > CONFIG_TARGET_CPU_BOOL is set but CONFIG_TARGET_CPU not! > > Yes, because there is no default value for E5500_CPU and E6500_CPU. We > need to add one for each.
I see... Will you prepare this fixup for your previous patch? And I think that following construct $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU)) should be changed just to -mcpu=$(CONFIG_TARGET_CPU) Because if user specified that want build for specific target CPU, it should not be silently ignored.
