yann@1
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1 |
# 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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4 |
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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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17 |
config ARCH_SUPPORT_FPU
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michael@2739
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config ARCH_SUPPORT_SOFTFP
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yann@1345
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19 |
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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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25 |
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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@1870
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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@2413
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comment "Generic target options"
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yann@2413
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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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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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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 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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66 |
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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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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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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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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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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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100 |
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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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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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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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122 |
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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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127 |
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yann@1633
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endchoice
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yann@1633
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129 |
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yann@1633
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#--------------------------------------
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yann@1
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131 |
comment "Target optimisations"
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yann@1
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132 |
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yann@631
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133 |
config ARCH_SUPPORT_ARCH
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yann@631
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134 |
bool
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yann@631
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135 |
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yann@631
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136 |
config ARCH_SUPPORT_ABI
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yann@631
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137 |
bool
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yann@631
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138 |
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yann@631
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139 |
config ARCH_SUPPORT_CPU
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yann@631
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140 |
bool
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yann@631
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141 |
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yann@631
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142 |
config ARCH_SUPPORT_TUNE
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yann@631
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143 |
bool
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yann@631
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144 |
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yann@631
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145 |
config ARCH_SUPPORT_FPU
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yann@631
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146 |
bool
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yann@631
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147 |
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michael@2739
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148 |
config ARCH_SUPPORT_SOFTFP
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michael@2739
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149 |
bool
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michael@2739
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150 |
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yann@47
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151 |
config ARCH_ARCH
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yann@47
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152 |
string
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yann@425
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153 |
prompt "Architecture level"
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yann@631
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154 |
depends on ARCH_SUPPORT_ARCH
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yann@47
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155 |
default ""
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yann@47
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156 |
help
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yann@47
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157 |
GCC uses this name to determine what kind of instructions it can emit
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yann@47
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158 |
when generating assembly code. This option can be used in conjunction
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yann@47
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159 |
with or instead of the ARCH_CPU option (above), or a (command-line)
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yann@47
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160 |
-mcpu= option.
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yann@47
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161 |
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yann@47
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162 |
This is the configuration flag --with-arch=XXXX, and the runtime flag
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yann@47
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163 |
-march=XXX.
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yann@47
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164 |
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yann@47
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165 |
Pick a value from the gcc manual for your choosen gcc version and your
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yann@47
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166 |
target CPU.
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yann@47
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167 |
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yann@47
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168 |
Leave blank if you don't know, or if your target architecture does not
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yann@47
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169 |
offer this option.
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yann@47
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170 |
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yann@45
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171 |
config ARCH_ABI
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yann@45
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172 |
string
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yann@45
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173 |
prompt "Generate code for the specific ABI"
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yann@631
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174 |
depends on ARCH_SUPPORT_ABI
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yann@45
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175 |
default ""
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yann@45
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176 |
help
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yann@45
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177 |
Generate code for the given ABI.
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yann@45
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178 |
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yann@47
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179 |
This is the configuration flag --with-abi=XXXX, and the runtime flag
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yann@47
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180 |
-mabi=XXX.
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yann@47
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181 |
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yann@45
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182 |
Pick a value from the gcc manual for your choosen gcc version and your
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yann@45
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183 |
target CPU.
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yann@45
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184 |
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antony@2564
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185 |
Leave blank if you don't know, or if your target architecture does not
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yann@45
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186 |
offer this option.
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yann@45
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187 |
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yann@1
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188 |
config ARCH_CPU
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yann@1
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189 |
string
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yann@1
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190 |
prompt "Emit assembly for CPU"
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yann@631
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191 |
depends on ARCH_SUPPORT_CPU
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yann@1
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192 |
default ""
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yann@1
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193 |
help
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yann@283
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194 |
This specifies the name of the target processor. GCC uses this name
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yann@1
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195 |
to determine what kind of instructions it can emit when generating
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yann@1
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196 |
assembly code.
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yann@1
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197 |
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yann@47
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198 |
This is the configuration flag --with-cpu=XXXX, and the runtime flag
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yann@47
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199 |
-mcpu=XXX.
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yann@47
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200 |
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yann@1
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201 |
Pick a value from the gcc manual for your choosen gcc version and your
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yann@1
|
202 |
target CPU.
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yann@1
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203 |
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yann@1
|
204 |
Leave blank if you don't know, or if your target architecture does not
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yann@1
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205 |
offer this option.
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yann@1
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206 |
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yann@1
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207 |
config ARCH_TUNE
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yann@1
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208 |
string
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yann@1
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209 |
prompt "Tune for CPU"
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yann@631
|
210 |
depends on ARCH_SUPPORT_TUNE
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yann@1
|
211 |
default ""
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yann@1
|
212 |
help
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yann@1
|
213 |
This option is very similar to the ARCH_CPU option (above), except
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yann@1
|
214 |
that instead of specifying the actual target processor type, and hence
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yann@1
|
215 |
restricting which instructions can be used, it specifies that GCC should
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yann@1
|
216 |
tune the performance of the code as if the target were of the type
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yann@1
|
217 |
specified in this option, but still choosing the instructions that it
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yann@1
|
218 |
will generate based on the cpu specified by the ARCH_CPU option
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yann@1
|
219 |
(above), or a (command-line) -mcpu= option.
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yann@1
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220 |
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yann@47
|
221 |
This is the configuration flag --with-tune=XXXX, and the runtime flag
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yann@47
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222 |
-mtune=XXX.
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yann@1
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223 |
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yann@1
|
224 |
Pick a value from the gcc manual for your choosen gcc version and your
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yann@1
|
225 |
target CPU.
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yann@1
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226 |
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yann@1
|
227 |
Leave blank if you don't know, or if your target architecture does not
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yann@1
|
228 |
offer this option.
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yann@1
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229 |
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yann@1
|
230 |
config ARCH_FPU
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yann@1
|
231 |
string
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yann@47
|
232 |
prompt "Use specific FPU"
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yann@631
|
233 |
depends on ARCH_SUPPORT_FPU
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yann@1
|
234 |
default ""
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yann@1
|
235 |
help
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yann@1
|
236 |
On some targets (eg. ARM), you can specify the kind of FPU to emit
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yann@1
|
237 |
code for.
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yann@47
|
238 |
|
yann@47
|
239 |
This is the configuration flag --with-fpu=XXX, and the runtime flag
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yann@47
|
240 |
-mfpu=XXX.
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yann@1
|
241 |
|
yann@1
|
242 |
See below wether to actually emit FP opcodes, or to emulate them.
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yann@1
|
243 |
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yann@1
|
244 |
Pick a value from the gcc manual for your choosen gcc version and your
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yann@1
|
245 |
target CPU.
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yann@1
|
246 |
|
yann@1
|
247 |
Leave blank if you don't know, or if your target architecture does not
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yann@1
|
248 |
offer this option.
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yann@1
|
249 |
|
yann@1
|
250 |
choice
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yann@1
|
251 |
bool
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yann@1
|
252 |
prompt "Floating point:"
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yann@1
|
253 |
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yann@1
|
254 |
config ARCH_FLOAT_HW
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yann@1
|
255 |
bool
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yann@1
|
256 |
prompt "hardware (FPU)"
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yann@1
|
257 |
help
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yann@1
|
258 |
Emit hardware floating point opcodes.
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yann@1
|
259 |
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yann@1
|
260 |
If you've got a processor with a FPU, then you want that.
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yann@1
|
261 |
If your hardware has no FPU, you still can use HW floating point, but
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yann@1
|
262 |
need to compile support for FPU emulation in your kernel. Needless to
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yann@1
|
263 |
say that emulating the FPU is /slooowwwww/...
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yann@1
|
264 |
|
yann@1
|
265 |
One situation you'd want HW floating point without a FPU is if you get
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yann@1
|
266 |
binary blobs from different vendors that are compiling this way and
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yann@1
|
267 |
can't (don't wan't to) change.
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yann@1
|
268 |
|
yann@1
|
269 |
config ARCH_FLOAT_SW
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yann@1
|
270 |
bool
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yann@1
|
271 |
prompt "software"
|
yann@1
|
272 |
help
|
yann@1
|
273 |
Do not emit any hardware floating point opcode.
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yann@1
|
274 |
|
yann@1
|
275 |
If your processor has no FPU, then you most probably want this, as it
|
yann@1
|
276 |
is faster than emulating the FPU in the kernel.
|
yann@1
|
277 |
|
michael@2739
|
278 |
config ARCH_FLOAT_SOFTFP
|
michael@2739
|
279 |
bool
|
michael@2739
|
280 |
prompt "softfp"
|
michael@2739
|
281 |
depends on ARCH_SUPPORT_SOFTFP
|
michael@2739
|
282 |
help
|
michael@2739
|
283 |
Emit hardware floating point opcodes but use the software
|
michael@2739
|
284 |
floating point calling convention.
|
michael@2739
|
285 |
|
michael@2739
|
286 |
Architectures such as ARM use different registers for passing
|
michael@2739
|
287 |
floating point values depending on if they're in software mode
|
michael@2739
|
288 |
or hardware mode. softfp emits FPU instructions but uses the
|
michael@2739
|
289 |
software FP calling convention allowing softfp code to
|
michael@2739
|
290 |
interoperate with legacy software only code.
|
michael@2739
|
291 |
|
michael@2739
|
292 |
If in doubt, use 'software' or 'hardware' mode instead.
|
michael@2739
|
293 |
|
yann@1
|
294 |
endchoice
|
yann@1
|
295 |
|
yann@1
|
296 |
config TARGET_CFLAGS
|
yann@1
|
297 |
string
|
yann@41
|
298 |
prompt "Target CFLAGS"
|
yann@1
|
299 |
default ""
|
yann@1
|
300 |
help
|
yann@1
|
301 |
Used to add specific options when compiling libraries of the toolchain,
|
yann@1
|
302 |
that will run on the target (eg. libc.so).
|
yann@1
|
303 |
|
yann@531
|
304 |
Note that the options above for ARCH, ABI, CPU, TUNE and FPU will be
|
antony@2564
|
305 |
automatically used. You don't need to specify them here.
|
yann@1
|
306 |
|
yann@1
|
307 |
Leave blank if you don't know better.
|
yann@1
|
308 |
|
yann@767
|
309 |
config TARGET_LDFLAGS
|
yann@767
|
310 |
string
|
yann@767
|
311 |
prompt "Target LDFLAGS"
|
yann@767
|
312 |
default ""
|
yann@767
|
313 |
help
|
yann@767
|
314 |
Used to add specific options when linking libraries of the toolchain,
|
yann@767
|
315 |
that will run on your target.
|
yann@767
|
316 |
|
yann@767
|
317 |
Leave blank if you don't know better.
|
yann@767
|
318 |
|
michael@2737
|
319 |
config ARCH_FLOAT
|
michael@2737
|
320 |
string
|
michael@2737
|
321 |
default "hard" if ARCH_FLOAT_HW
|
michael@2737
|
322 |
default "soft" if ARCH_FLOAT_SW
|
michael@2739
|
323 |
default "softfp" if ARCH_FLOAT_SOFTFP
|
michael@2737
|
324 |
|
yann@2413
|
325 |
source "config.gen/arch.in.2"
|
yann@2413
|
326 |
|
yann@1
|
327 |
endmenu
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