arch: pass cpu option instead of tune option on ARM
Currently, the ARM Config.in logic specifies values for --with-arch/-march and --with-tune/-mtune, but not for --with-cpu/-mcpu. However, this causes problems on ARMv4, because specifying --with-arch=armv4t isn't enough to make gcc generate ARMv4 code: one should also pass --with-cpu=<some ARMv4 CPU>. Moreover, since Buildroot is generally designed to generate code specifically for the configured target, it makes sense to give our own --with-cpu/-mcpu value instead of relying on the default value used by gcc, and only do small optimizations with -mtune. Reported-by: Adam Hussein <kryme76@yahoo.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
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@ -341,7 +341,7 @@ config BR2_ENDIAN
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default "LITTLE" if BR2_arm
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default "BIG" if BR2_armeb
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config BR2_GCC_TARGET_TUNE
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config BR2_GCC_TARGET_CPU
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default "arm7tdmi" if BR2_arm7tdmi
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default "arm7tdmi" if BR2_arm720t
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default "arm7tdmi" if BR2_arm740t
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