arch/mips: add support for MIPS32 FP mode

MIPS32 support different FP modes (32,xx,64), so give the user the
opportunity to choose between them. That will cause host-gcc to be built
using the --with-fp-32=[32|xx|64] configure option. Also the
-mfp[32|xx|64] gcc option will be added to TARGET_CFLAGS and to the
toolchain wrapper.

FP mode option shouldn't be used for soft-float, so we add logic in the
toolchain wrapper if -msoft-float is among the arguments in order to not
append the -fp[[32|xx|64] option, otherwise the compilation may fail.

Information about FP modes here:

- https://sourceware.org/binutils/docs/as/MIPS-Options.html
- https://dmz-portal.imgtec.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking#5._Generating_modeless_code

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

arch/Config.in

@@ -267,6 +267,9 @@ config BR2_GCC_TARGET_ABI
 config BR2_GCC_TARGET_NAN
 	string
 
+config BR2_GCC_TARGET_FP32_MODE
+	string
+
 config BR2_GCC_TARGET_CPU
 	string
 

arch/Config.in.mips

@@ -134,6 +134,30 @@ config BR2_MIPS_SOFT_FLOAT
 	  floating point functions, then everything will need to be
 	  compiled with soft floating point support (-msoft-float).
 
+choice
+	prompt "FP mode"
+	depends on !BR2_ARCH_IS_64 && !BR2_MIPS_SOFT_FLOAT
+	default BR2_MIPS_FP32_MODE_XX
+	help
+	  FP mode to be used
+
+config BR2_MIPS_FP32_MODE_32
+	bool "32"
+	depends on !BR2_MIPS_CPU_MIPS32R6
+
+config BR2_MIPS_FP32_MODE_XX
+	bool "xx"
+
+config BR2_MIPS_FP32_MODE_64
+	bool "64"
+	depends on !BR2_MIPS_CPU_MIPS32
+endchoice
+
+config BR2_GCC_TARGET_FP32_MODE
+	default "32"	if BR2_MIPS_FP32_MODE_32
+	default "xx"	if BR2_MIPS_FP32_MODE_XX
+	default "64"	if BR2_MIPS_FP32_MODE_64
+
 config BR2_MIPS_NAN_LEGACY
 	bool