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MIPS: Fix build with binutils 2.24.51+

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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>
This commit is contained in:
Manuel Lauss
2014-11-07 14:13:54 +01:00
committed by Ralf Baechle
parent 491a48aa52
commit 842dfc11ea
14 changed files with 118 additions and 17 deletions
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5
arch/mips/kernel/r6000_fpu.S
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@@ -18,6 +18,9 @@
.set noreorder
.set mips2
.set push
SET_HARDFLOAT
/* Save floating point context */
LEAF(_save_fp_context)
mfc0 t0,CP0_STATUS
@@ -85,3 +88,5 @@
1: jr ra
nop
END(_restore_fp_context)
.set pop /* SET_HARDFLOAT */