I didn't encounter this error with what will be gcc-4.9.3.
Manuel
On Fri, Oct 31, 2014 at 5:13 PM, Markos Chandras
<Markos.Chandras@xxxxxxxxxx> wrote:
> On 10/31/2014 04:03 PM, Manuel Lauss wrote:
>> Starting with version 2.24.51.20140728 MIPS binutils complain loudly
>> about mixing soft-float and hard-float object files, leading to this
>> build failure since GCC is invoked with "-msoft-float" on MIPS:
>>
>> {standard input}: Warning: .gnu_attribute 4,3 requires `softfloat'
>> LD arch/mips/alchemy/common/built-in.o
>> mipsel-softfloat-linux-gnu-ld: Warning: arch/mips/alchemy/common/built-in.o
>> uses -msoft-float (set by arch/mips/alchemy/common/prom.o),
>> arch/mips/alchemy/common/sleeper.o uses -mhard-float
>>
>> To fix this, we detect if GAS is new enough to support "-msoft-float" command
>> option, and if it does, we can let GCC pass it to GAS; but then we also need
>> to sprinkle the files which make use of floating point registers with the
>> necessary ".set hardfloat" directives.
>>
>> Signed-off-by: Manuel Lauss <manuel.lauss@xxxxxxxxx>
>> ---
>> Compiles with binutils 2.23 and current git head, tested with alchemy (mips32r1)
>> and maltasmvp_defconfig (64bit)
>>
>> Tests with MSA and other extensions also appreciated!
>>
>> v6: #undef fp so that the preprocessor does not replace the fp in
>> .set fp=64 with $30... Fixes 64bit build.
>
> Technically speaking, a maltasmvp_defconfig selects CONFIG_32BIT=y so
> it's still a 32-bit build.
>> [...]
>
> Ok the fp problem went away but I still have the even/odd errors with my
> tools
>
> arch/mips/kernel/r4k_switch.S: Assembler messages:
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 1
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 3
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 5
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 7
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 9
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 11
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 13
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 15
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 17
> arch/mips/kernel/r4k_switch.S:81: Error: float register should be even,
> was 19
>
> The following patch did not help either:
>
> diff --git a/arch/mips/Makefile b/arch/mips/Makefile
> index 58076472bdd8..b8bb7e170fee 100644
> --- a/arch/mips/Makefile
> +++ b/arch/mips/Makefile
> @@ -56,7 +56,7 @@ ifdef CONFIG_FUNCTION_GRAPH_TRACER
> endif
> endif
> cflags-y += $(call cc-option, -mno-check-zero-division)
> -
> +cflags-y += -mno-odd-spreg
>
> This is with a regular maltasmvp_defconfig
>
> I guess my gcc version is newer than yours. Matthew?
>
> --
> markos
