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| author | Maciej W. Rozycki <macro@linux-mips.org> | 2014-06-29 01:59:35 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-07-30 15:53:49 +0200 |
| commit | b625cd4aa417b979e59359a8ca020cad8e032df1 (patch) | |
| tree | be431c89eb786dde7abf932d9a24367bd3d21467 | |
| parent | MIPS: asm/bitops.h: Guard CLZ with `.set mips32' (diff) | |
| download | linux-b625cd4aa417b979e59359a8ca020cad8e032df1.tar.xz linux-b625cd4aa417b979e59359a8ca020cad8e032df1.zip | |
MIPS: SB1: Check optional compilation flags one by one
This fixes a regression caused by commit
bb6c0bd3fdb67c8a1fceea1d4700b9ee593309f9 [MIPS: SB1: Fix excessive kernel
warnings.], that makes `-march=r5000' selected for compilation flags
rather than supposed `-march=sb1' with compilers that do not support the
ASE selection flags introduced with that change.
For example GCC 4.1.2 supports `-mips3d'/`-mno-mips3d' (and obviously
`-march=sb1'), however it does not support `-mdmx'/`-mno-mdmx'. As a
result the whole selection of flags fails and compilation resorts to using
`-march=r5000', meant for really old compilers indeed only.
It is always best to pick the flags individually unless we are absolutely
sure a set of flags was introduced to the toolchain together (`-march=sb1'
and `-mtune=sb1' would be a good example), and this change makes it happen
for CONFIG_CPU_SB1. Consequently the flags ultimately selected with GCC
4.1.2 are `-march=sb1 -Wa,--trap -mno-mips3d'
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Richard Sandiford <rdsandiford@googlemail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7223/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/Makefile | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile index a8521de14791..9336509f47ad 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -151,8 +151,10 @@ cflags-$(CONFIG_CPU_NEVADA) += $(call cc-option,-march=rm5200,-march=r5000) \ -Wa,--trap cflags-$(CONFIG_CPU_RM7000) += $(call cc-option,-march=rm7000,-march=r5000) \ -Wa,--trap -cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-march=sb1 -mno-mdmx -mno-mips3d,-march=r5000) \ +cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-march=sb1,-march=r5000) \ -Wa,--trap +cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-mno-mdmx) +cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-mno-mips3d) cflags-$(CONFIG_CPU_R8000) += -march=r8000 -Wa,--trap cflags-$(CONFIG_CPU_R10000) += $(call cc-option,-march=r10000,-march=r8000) \ -Wa,--trap |