[v2,6/9] LoongArch: Remove all -G0 switches from CFLAGS

Message ID	20230624184055.3000636-7-kernel@xen0n.name (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-kbuild-owner@vger.kernel.org> From: WANG Xuerui <kernel@xen0n.name> To: Huacai Chen <chenhuacai@kernel.org> Cc: WANG Rui <wangrui@loongson.cn>, Xi Ruoyao <xry111@xry111.site>, loongarch@lists.linux.dev, linux-kbuild@vger.kernel.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org, WANG Xuerui <git@xen0n.name> Subject: [PATCH v2 6/9] LoongArch: Remove all -G0 switches from CFLAGS Date: Sun, 25 Jun 2023 02:40:52 +0800 Message-Id: <20230624184055.3000636-7-kernel@xen0n.name> In-Reply-To: <20230624184055.3000636-1-kernel@xen0n.name> References: <20230624184055.3000636-1-kernel@xen0n.name> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	LoongArch: Preliminary ClangBuiltLinux enablement \| expand [v2,0/9] LoongArch: Preliminary ClangBuiltLinux enablement [v2,1/9] LoongArch: Calculate various sizes in the linker script [v2,2/9] LoongArch: extable: Also recognize ABI names of registers [v2,3/9] LoongArch: Prepare for assemblers with proper FCSR class support [v2,4/9] LoongArch: Make the CPUCFG and CSR ops simple aliases of compiler built-ins [v2,5/9] LoongArch: Simplify the invtlb wrappers [v2,6/9] LoongArch: Remove all -G0 switches from CFLAGS [v2,7/9] LoongArch: Tweak CFLAGS for Clang compatibility [v2,8/9] LoongArch: Mark Clang LTO as working [v2,9/9] Makefile: Add loongarch target flag for Clang compilation

Message ID

20230624184055.3000636-7-kernel@xen0n.name (mailing list archive)

State

New, archived

Headers

From: WANG Xuerui <kernel@xen0n.name>
To: Huacai Chen <chenhuacai@kernel.org>
Cc: WANG Rui <wangrui@loongson.cn>, Xi Ruoyao <xry111@xry111.site>,
        loongarch@lists.linux.dev, linux-kbuild@vger.kernel.org,
        llvm@lists.linux.dev, linux-kernel@vger.kernel.org,
        WANG Xuerui <git@xen0n.name>
Subject: [PATCH v2 6/9] LoongArch: Remove all -G0 switches from CFLAGS
Date: Sun, 25 Jun 2023 02:40:52 +0800
Message-Id: <20230624184055.3000636-7-kernel@xen0n.name>
In-Reply-To: <20230624184055.3000636-1-kernel@xen0n.name>
References: <20230624184055.3000636-1-kernel@xen0n.name>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Series

LoongArch: Preliminary ClangBuiltLinux enablement | expand

Commit Message

WANG Xuerui June 24, 2023, 6:40 p.m. UTC

From: WANG Xuerui <git@xen0n.name>

In GCC, -G stands for "small data threshold", that instructs the
compiler to put data smaller than the specified threshold in a dedicated
"small data" section (called .sdata on LoongArch and several other
arches).

However, benefiting from this would require ABI cooperation, which is
not the case for LoongArch; and current GCC behave the same whether -G0
(equal to disabling this optimization) is given or not. So, remove -G0
from CFLAGS altogether for one less thing to care about. This also
benefits LLVM/Clang compatibility where the -G switch is not supported.

Signed-off-by: WANG Xuerui <git@xen0n.name>
---
 arch/loongarch/Makefile      | 4 ++--
 arch/loongarch/vdso/Makefile | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index a27e264bdaa5..366771016b99 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -46,8 +46,8 @@  ld-emul			= $(64bit-emul)
 cflags-y		+= -mabi=lp64s
 endif
 
-cflags-y			+= -G0 -pipe -msoft-float
-LDFLAGS_vmlinux			+= -G0 -static -n -nostdlib
+cflags-y			+= -pipe -msoft-float
+LDFLAGS_vmlinux			+= -static -n -nostdlib
 
 # When the assembler supports explicit relocation hint, we must use it.
 # GCC may have -mexplicit-relocs off by default if it was built with an old
diff --git a/arch/loongarch/vdso/Makefile b/arch/loongarch/vdso/Makefile
index 4c859a0e4754..ee4abcf5642e 100644
--- a/arch/loongarch/vdso/Makefile
+++ b/arch/loongarch/vdso/Makefile
@@ -25,7 +25,7 @@  endif
 cflags-vdso := $(ccflags-vdso) \
 	-isystem $(shell $(CC) -print-file-name=include) \
 	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
-	-O2 -g -fno-strict-aliasing -fno-common -fno-builtin -G0 \
+	-O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
 	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
 	$(call cc-option, -fno-asynchronous-unwind-tables) \
 	$(call cc-option, -fno-stack-protector)

[v2,6/9] LoongArch: Remove all -G0 switches from CFLAGS

Commit Message

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