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arch/powerpc: get rid of BR2_GCC_TARGET_TUNE

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According to the gcc documentation for PowerPC options:

'-mtune=CPU_TYPE'
     Set the instruction scheduling parameters for machine type
     CPU_TYPE, but do not set the architecture type, register usage, or
     choice of mnemonics, as '-mcpu=CPU_TYPE' would.  The same values
     for CPU_TYPE are used for '-mtune' as for '-mcpu'.  If both are
     specified, the code generated will use the architecture, registers,
     and mnemonics set by '-mcpu', but the scheduling parameters set by
     '-mtune'.

In the case of Buildroot where we only target a specific system, using
-mtune therefore doesn't make much sense, and using -mcpu would be
more appropriate. As a consequence, this patch makes PowerPC use
BR2_GCC_TARGET_CPU instead of BR2_GCC_TARGET_TUNE.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni
2014-10-21 22:27:13 +02:00
committed by Peter Korsgaard
parent a5023c5204
commit 75418c4cf6
1 changed files with 1 additions and 1 deletions
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2
arch/Config.in.powerpc
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@@ -160,7 +160,7 @@ config BR2_ENDIAN
config BR2_ARCH_HAS_ATOMICS
default y
config BR2_GCC_TARGET_TUNE
config BR2_GCC_TARGET_CPU
default "401" if BR2_powerpc_401
default "403" if BR2_powerpc_403
default "405" if BR2_powerpc_405