linux-kernel - [PATCH 1/2] MIPS: Loongson64: Clean up use of cc-ifversion

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Date:   Thu, 20 Jan 2022 14:40:00 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 1/2] MIPS: Loongson64: Clean up use of cc-ifversion

This Makefile checks that GCC is 4.9 or newer, which is redundant after
commit 76ae847497bc ("Documentation: raise minimum supported version of
GCC to 5.1"), so cc-option can be removed.

Clang does not support -march=loongson3a so it needs to continue to use
-march=mips64r2, along with binutils less than 2.25, so check that both
GCC and binutils 2.25 or newer are being used before using
-march=loongson3a. These flags do not need to be checked with cc-option
anymore because all GCC versions support -march=loongson3a and
-march=mips64r2 and all clang versions support -march=mips64r2.

Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/mips/loongson64/Platform | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/mips/loongson64/Platform b/arch/mips/loongson64/Platform
index 3e660d6d3c2b..981d3abc150e 100644
--- a/arch/mips/loongson64/Platform
+++ b/arch/mips/loongson64/Platform
@@ -12,17 +12,10 @@ cflags-$(CONFIG_CPU_LOONGSON64)	+= -Wa,--trap
 # by GAS.  The cc-option can't probe for this behaviour so -march=loongson3a
 # can't easily be used safely within the kbuild framework.
 #
-ifeq ($(call cc-ifversion, -ge, 0409, y), y)
-  ifeq ($(call ld-ifversion, -ge, 22500, y), y)
-    cflags-$(CONFIG_CPU_LOONGSON64)  += \
-      $(call cc-option,-march=loongson3a -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
-  else
-    cflags-$(CONFIG_CPU_LOONGSON64)  += \
-      $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
-  endif
+ifeq ($(CONFIG_CC_IS_GCC)$(call ld-ifversion, -ge, 22500, y), yy)
+  cflags-$(CONFIG_CPU_LOONGSON64) += -march=loongson3a -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64
 else
-    cflags-$(CONFIG_CPU_LOONGSON64)  += \
-      $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
+  cflags-$(CONFIG_CPU_LOONGSON64) += -march=mips64r2
 endif
 
 # Some -march= flags enable MMI instructions, and GCC complains about that

base-commit: 2c271fe77d52a0555161926c232cd5bc07178b39
-- 
2.34.1