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arch: pass cpu option instead of tune option on ARM

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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>
This commit is contained in:
Thomas Petazzoni 2013-11-02 16:39:06 +01:00
parent fe093f226c
commit d3539dd53b
1 changed files with 1 additions and 1 deletions
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arch/Config.in.arm
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@ -341,7 +341,7 @@ config BR2_ENDIAN
default "LITTLE" if BR2_arm
default "BIG" if BR2_armeb
config BR2_GCC_TARGET_TUNE
config BR2_GCC_TARGET_CPU
default "arm7tdmi" if BR2_arm7tdmi
default "arm7tdmi" if BR2_arm720t
default "arm7tdmi" if BR2_arm740t