MIPS: Fix build with binutils 2.24.51+
authorManuel Lauss <manuel.lauss@gmail.com>
Fri, 7 Nov 2014 13:13:54 +0000 (14:13 +0100)
committerRalf Baechle <ralf@linux-mips.org>
Fri, 7 Nov 2014 14:07:36 +0000 (15:07 +0100)
commit842dfc11ea9a21f9825167c8a4f2834b205b0a79
tree9d6d8319328c38f5d259aeecdc7a541cf9f281b5
parent491a48aa52f03b4654edbf8f97c1aa7d2f24f62e
MIPS: Fix build with binutils 2.24.51+

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@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Cc: Markos Chandras <Markos.Chandras@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8355/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
14 files changed:
arch/mips/Makefile
arch/mips/include/asm/asmmacro-32.h
arch/mips/include/asm/asmmacro.h
arch/mips/include/asm/fpregdef.h
arch/mips/include/asm/fpu.h
arch/mips/include/asm/mipsregs.h
arch/mips/kernel/branch.c
arch/mips/kernel/genex.S
arch/mips/kernel/r2300_fpu.S
arch/mips/kernel/r2300_switch.S
arch/mips/kernel/r4k_fpu.S
arch/mips/kernel/r4k_switch.S
arch/mips/kernel/r6000_fpu.S
arch/mips/math-emu/cp1emu.c