toolchain: select sensible floating point mode by default

Introduce BR2_PREFER_SOFT_FLOAT and enable it for arm, avr32 and mips,
and use it to enable soft float support by default for those archs.

This way people automatically get the correct floating point mode when
running make menuconfig for the first time (E.G. without a .config) and
changing the arch from i386 to arm/avr32/mips.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

diff --git a/toolchain/Config.in.2 b/toolchain/Config.in.2
index 2da5670a228976f2d3330cb8d7fb723111f6e4d1..2f7de75b66850b980f87659622ba52ebe3db7115 100644 (file)
--- a/toolchain/Config.in.2
+++ b/toolchain/Config.in.2
@@ -74,17 +74,20 @@ config BR2_USE_WCHAR
          If you have an external binary toolchain that has been built 
          with WCHAR support then enable this option.
 
+config BR2_PREFER_SOFT_FLOAT
+       bool
+       default y if BR2_arm || BR2_armeb || BR2_avr32 || BR2_mips || BR2_mipsel || BR2_nios2
+
 config BR2_SOFT_FLOAT
        bool "Use software floating point by default"
        depends on BR2_arm || BR2_armeb || BR2_avr32 || BR2_mips || BR2_mipsel || BR2_powerpc || BR2_nios2
+       default $(BR2_PREFER_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).
 
-         Most people will answer N.
-
 config BR2_USE_SSP
        bool "Enable stack protection support"
        help