yann@1
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# Target definition: architecture, optimisations, etc...
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yann@1
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yann@1
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menu "Target options"
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yann@1
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yann@47
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config ARCH
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yann@47
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string
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yann@628
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yann@628
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# Pre-declare target optimisation variables
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yann@1345
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config ARCH_SUPPORTS_BOTH_MMU
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yann@1345
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config ARCH_SUPPORTS_BOTH_ENDIAN
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yann@1633
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config ARCH_SUPPORTS_32
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yann@1633
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config ARCH_SUPPORTS_64
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yann@631
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config ARCH_SUPPORT_ARCH
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yann@631
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config ARCH_SUPPORT_ABI
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yann@631
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config ARCH_SUPPORT_CPU
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yann@631
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config ARCH_SUPPORT_TUNE
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yann@631
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config ARCH_SUPPORT_FPU
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yann@1345
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yann@1345
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config ARCH_DEFAULT_HAS_MMU
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yann@628
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config ARCH_DEFAULT_BE
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yann@628
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config ARCH_DEFAULT_LE
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yann@1633
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config ARCH_DEFAULT_32
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yann@1633
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config ARCH_DEFAULT_64
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yann@1345
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yann@633
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config ARCH_ARCH
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yann@633
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config ARCH_ABI
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yann@633
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config ARCH_CPU
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yann@633
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config ARCH_TUNE
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yann@633
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config ARCH_FPU
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yann@633
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config ARCH_BE
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yann@633
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config ARCH_LE
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yann@1638
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config ARCH_32
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yann@1638
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config ARCH_64
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yann@1715
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config ARCH_BITNESS
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yann@628
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config ARCH_FLOAT_HW
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yann@628
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config ARCH_FLOAT_SW
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yann@628
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config TARGET_CFLAGS
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yann@791
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config TARGET_LDFLAGS
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yann@628
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yann@628
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comment "General target options"
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yann@47
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yann@628
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source config.gen/arch.in
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yann@1
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yann@1345
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#--------------------------------------
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yann@1345
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config ARCH_SUPPORTS_BOTH_MMU
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yann@1345
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bool
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yann@1345
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default n
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yann@1345
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yann@1345
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config ARCH_DEFAULT_HAS_MMU
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yann@1345
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bool
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yann@1345
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default n
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yann@1345
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yann@1345
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config ARCH_USE_MMU
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yann@1345
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bool
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yann@1345
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prompt "Use the MMU" if ARCH_SUPPORTS_BOTH_MMU
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yann@1345
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default n if ! ARCH_DEFAULT_HAS_MMU
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yann@1345
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default y if ARCH_DEFAULT_HAS_MMU
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yann@1586
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help
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yann@1586
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If your architecture has an MMU and you want to use it,
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yann@1586
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say 'Y' here.
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yann@1586
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yann@1586
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OTOH, if you don't want to use the MMU, or your arch
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yann@1586
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lacks an MMU, say 'N' here.
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yann@1586
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yann@1586
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Note that some architectures (eg. ARM) has variants that
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yann@1586
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lacks an MMU (eg. ARM Cortex-M3), while other variants
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yann@1586
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have one (eg. ARM Cortex-A8).
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yann@1345
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yann@1345
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#--------------------------------------
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yann@136
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config ARCH_SUPPORTS_BOTH_ENDIAN
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yann@35
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bool
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yann@35
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default n
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yann@35
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yann@347
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config ARCH_DEFAULT_BE
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yann@347
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bool
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yann@347
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default n
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yann@347
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yann@347
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config ARCH_DEFAULT_LE
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yann@347
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bool
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yann@347
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default n
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yann@347
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yann@1
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choice
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yann@1
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bool
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yann@1
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prompt "Endianness:"
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yann@136
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depends on ARCH_SUPPORTS_BOTH_ENDIAN
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yann@347
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default ARCH_BE if ARCH_DEFAULT_BE
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yann@347
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default ARCH_LE if ARCH_DEFAULT_LE
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yann@1
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yann@1
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config ARCH_BE
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yann@1
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bool
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yann@1
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prompt "Big endian"
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yann@1
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yann@1
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config ARCH_LE
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yann@1
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bool
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yann@1
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prompt "Little endian"
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yann@1
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yann@1
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endchoice
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yann@1
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yann@1345
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#--------------------------------------
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yann@1633
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config ARCH_SUPPORTS_32
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yann@1633
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bool
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yann@1633
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default n
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yann@1633
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yann@1633
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config ARCH_SUPPORTS_64
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yann@1633
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bool
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yann@1633
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default n
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yann@1633
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yann@1633
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config ARCH_DEFAULT_32
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yann@1633
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bool
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yann@1633
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default n
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yann@1633
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yann@1633
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config ARCH_DEFAULT_64
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yann@1633
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bool
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yann@1633
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default n
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yann@1633
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yann@1715
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config ARCH_BITNESS
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yann@1715
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int
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yann@1715
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default "32" if ARCH_32
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yann@1715
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default "64" if ARCH_64
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yann@1715
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yann@1633
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choice
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yann@1633
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bool
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yann@1633
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prompt "Bitness:"
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yann@1638
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default ARCH_32 if ARCH_DEFAULT_32
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yann@1638
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default ARCH_64 if ARCH_DEFAULT_64
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yann@1633
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yann@1638
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config ARCH_32
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yann@1633
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bool
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yann@1633
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prompt "32-bit"
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yann@1633
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depends on ARCH_SUPPORTS_32
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yann@1633
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yann@1638
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config ARCH_64
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yann@1633
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bool
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yann@1633
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prompt "64-bit"
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yann@1633
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depends on ARCH_SUPPORTS_64
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yann@1633
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yann@1633
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endchoice
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yann@1633
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yann@1633
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#--------------------------------------
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yann@1
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comment "Target optimisations"
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yann@1
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yann@631
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config ARCH_SUPPORT_ARCH
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yann@631
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bool
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yann@631
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default n
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yann@631
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yann@631
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config ARCH_SUPPORT_ABI
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yann@631
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bool
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yann@631
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default n
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yann@631
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yann@631
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config ARCH_SUPPORT_CPU
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yann@631
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bool
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yann@631
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default n
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yann@631
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yann@631
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config ARCH_SUPPORT_TUNE
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yann@631
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bool
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yann@631
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default n
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yann@631
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yann@631
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config ARCH_SUPPORT_FPU
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yann@631
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bool
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yann@631
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default n
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yann@631
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yann@47
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config ARCH_ARCH
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yann@47
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string
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yann@425
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prompt "Architecture level"
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yann@631
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depends on ARCH_SUPPORT_ARCH
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yann@47
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default ""
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yann@47
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help
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yann@47
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GCC uses this name to determine what kind of instructions it can emit
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yann@47
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when generating assembly code. This option can be used in conjunction
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yann@47
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with or instead of the ARCH_CPU option (above), or a (command-line)
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yann@47
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-mcpu= option.
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yann@47
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yann@47
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This is the configuration flag --with-arch=XXXX, and the runtime flag
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yann@47
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-march=XXX.
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yann@47
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yann@47
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Pick a value from the gcc manual for your choosen gcc version and your
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yann@47
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target CPU.
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yann@47
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yann@47
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Leave blank if you don't know, or if your target architecture does not
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yann@47
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offer this option.
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yann@47
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yann@45
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config ARCH_ABI
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yann@45
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string
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yann@45
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prompt "Generate code for the specific ABI"
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yann@631
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185 |
depends on ARCH_SUPPORT_ABI
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yann@45
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default ""
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yann@45
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help
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yann@45
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Generate code for the given ABI.
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yann@45
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yann@47
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This is the configuration flag --with-abi=XXXX, and the runtime flag
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yann@47
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-mabi=XXX.
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yann@47
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yann@45
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Pick a value from the gcc manual for your choosen gcc version and your
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yann@45
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target CPU.
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yann@45
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yann@45
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Leave blank if you don't know, or if your target architecutre does not
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yann@45
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offer this option.
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yann@45
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yann@1
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config ARCH_CPU
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yann@1
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200 |
string
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yann@1
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prompt "Emit assembly for CPU"
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yann@631
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202 |
depends on ARCH_SUPPORT_CPU
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yann@1
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default ""
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yann@1
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help
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yann@283
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205 |
This specifies the name of the target processor. GCC uses this name
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yann@1
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206 |
to determine what kind of instructions it can emit when generating
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yann@1
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assembly code.
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yann@1
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yann@47
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This is the configuration flag --with-cpu=XXXX, and the runtime flag
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yann@47
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-mcpu=XXX.
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yann@47
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yann@1
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212 |
Pick a value from the gcc manual for your choosen gcc version and your
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yann@1
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target CPU.
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yann@1
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214 |
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yann@1
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215 |
Leave blank if you don't know, or if your target architecture does not
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yann@1
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216 |
offer this option.
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yann@1
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217 |
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yann@1
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config ARCH_TUNE
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yann@1
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string
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yann@1
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prompt "Tune for CPU"
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yann@631
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221 |
depends on ARCH_SUPPORT_TUNE
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yann@1
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222 |
default ""
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yann@1
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help
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yann@1
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224 |
This option is very similar to the ARCH_CPU option (above), except
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yann@1
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that instead of specifying the actual target processor type, and hence
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yann@1
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restricting which instructions can be used, it specifies that GCC should
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yann@1
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227 |
tune the performance of the code as if the target were of the type
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yann@1
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specified in this option, but still choosing the instructions that it
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yann@1
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will generate based on the cpu specified by the ARCH_CPU option
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yann@1
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(above), or a (command-line) -mcpu= option.
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yann@1
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yann@47
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This is the configuration flag --with-tune=XXXX, and the runtime flag
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yann@47
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-mtune=XXX.
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yann@1
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yann@1
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Pick a value from the gcc manual for your choosen gcc version and your
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yann@1
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target CPU.
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yann@1
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237 |
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yann@1
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Leave blank if you don't know, or if your target architecture does not
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yann@1
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offer this option.
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yann@1
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240 |
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yann@1
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241 |
config ARCH_FPU
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yann@1
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242 |
string
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yann@47
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243 |
prompt "Use specific FPU"
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yann@631
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244 |
depends on ARCH_SUPPORT_FPU
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yann@1
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245 |
default ""
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yann@1
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246 |
help
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yann@1
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247 |
On some targets (eg. ARM), you can specify the kind of FPU to emit
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yann@1
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248 |
code for.
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yann@47
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249 |
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yann@47
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250 |
This is the configuration flag --with-fpu=XXX, and the runtime flag
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yann@47
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251 |
-mfpu=XXX.
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yann@1
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252 |
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yann@1
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253 |
See below wether to actually emit FP opcodes, or to emulate them.
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yann@1
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254 |
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yann@1
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255 |
Pick a value from the gcc manual for your choosen gcc version and your
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yann@1
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256 |
target CPU.
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yann@1
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257 |
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yann@1
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258 |
Leave blank if you don't know, or if your target architecture does not
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yann@1
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259 |
offer this option.
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yann@1
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260 |
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yann@1
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261 |
choice
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yann@1
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262 |
bool
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yann@1
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263 |
prompt "Floating point:"
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yann@1
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264 |
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yann@1
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265 |
config ARCH_FLOAT_HW
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yann@1
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266 |
bool
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yann@1
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267 |
prompt "hardware (FPU)"
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yann@1
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268 |
help
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yann@1
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269 |
Emit hardware floating point opcodes.
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yann@1
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270 |
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yann@1
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271 |
If you've got a processor with a FPU, then you want that.
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yann@1
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272 |
If your hardware has no FPU, you still can use HW floating point, but
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yann@1
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273 |
need to compile support for FPU emulation in your kernel. Needless to
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yann@1
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274 |
say that emulating the FPU is /slooowwwww/...
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yann@1
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275 |
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yann@1
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276 |
One situation you'd want HW floating point without a FPU is if you get
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yann@1
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277 |
binary blobs from different vendors that are compiling this way and
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yann@1
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278 |
can't (don't wan't to) change.
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yann@1
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279 |
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yann@1
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280 |
config ARCH_FLOAT_SW
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yann@1
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281 |
bool
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yann@1
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282 |
prompt "software"
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yann@1
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283 |
help
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yann@1
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284 |
Do not emit any hardware floating point opcode.
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yann@1
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285 |
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yann@1
|
286 |
If your processor has no FPU, then you most probably want this, as it
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yann@1
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287 |
is faster than emulating the FPU in the kernel.
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yann@1
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288 |
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yann@1
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289 |
endchoice
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yann@1
|
290 |
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yann@1
|
291 |
config TARGET_CFLAGS
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yann@1
|
292 |
string
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yann@41
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293 |
prompt "Target CFLAGS"
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yann@1
|
294 |
default ""
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yann@1
|
295 |
help
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yann@1
|
296 |
Used to add specific options when compiling libraries of the toolchain,
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yann@1
|
297 |
that will run on the target (eg. libc.so).
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yann@1
|
298 |
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yann@531
|
299 |
Note that the options above for ARCH, ABI, CPU, TUNE and FPU will be
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yann@1
|
300 |
automaticaly used. You don't need to specify them here.
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yann@1
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301 |
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yann@1
|
302 |
Leave blank if you don't know better.
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yann@1
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303 |
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yann@767
|
304 |
config TARGET_LDFLAGS
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yann@767
|
305 |
string
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yann@767
|
306 |
prompt "Target LDFLAGS"
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yann@767
|
307 |
default ""
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yann@767
|
308 |
help
|
yann@767
|
309 |
Used to add specific options when linking libraries of the toolchain,
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yann@767
|
310 |
that will run on your target.
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yann@767
|
311 |
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yann@767
|
312 |
Leave blank if you don't know better.
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yann@767
|
313 |
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yann@1
|
314 |
endmenu
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