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arch: Refactor BR2_SOFT_FLOAT into per-architecture options

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As we are going to introduced a more advanced support of floating
point options for the ARM architecture, we need to adjust how the
soft-float option is handled. We replace the current hidden option
BR2_PREFER_SOFT_FLOAT option and the visible BR2_SOFT_FLOAT option by:

 * A global hidden BR2_SOFT_FLOAT option, defined in arch/Config.in,
   that tells whether the architecture-specific code is using software
   emulated floating point. This hidden option can be used throughout
   Buildroot to determine whether soft float is used or not.

 * Per-architecture visible BR2_<arch>_SOFT_FLOAT options, for the
   architecture for which it makes sense, which allows users to select
   soft float emulation when needed.

This change will allow each architecture to have a different way of
presenting its floating point capabilities.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni
2013-07-16 10:03:13 +02:00
committed by Peter Korsgaard
parent d774551787
commit 9b3e72b4fd
5 changed files with 32 additions and 21 deletions
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10
arch/Config.in.arm
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@@ -79,6 +79,16 @@ endchoice
config BR2_ARM_EABI
def_bool y
config BR2_ARM_SOFT_FLOAT
bool "Use soft-float"
default y
select BR2_SOFT_FLOAT
help
If your target CPU does not have a Floating Point Unit (FPU)
or a kernel FPU emulator, but you still wish to support
floating point functions, then everything will need to be
compiled with soft floating point support (-msoft-float).
config BR2_ARM_ENABLE_NEON
bool "Enable NEON SIMD extension support"
depends on BR2_ARM_CPU_MAYBE_HAS_NEON