linux-kernel - [PATCH 1/3] powerpc/boot: Only use '-mabi=elfv2' with CONFIG_PPC64_BOOT

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Message-Id: <20230118-ppc64-elfv2-llvm-v1-1-b9e2ec9da11d@kernel.org>
Date:   Wed, 15 Feb 2023 11:41:15 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     mpe@...erman.id.au
Cc:     npiggin@...il.com, christophe.leroy@...roup.eu,
        erhard_f@...lbox.org, nathan@...nel.org, ndesaulniers@...gle.com,
        trix@...hat.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        patches@...ts.linux.dev
Subject: [PATCH 1/3] powerpc/boot: Only use '-mabi=elfv2' with
 CONFIG_PPC64_BOOT_WRAPPER

When CONFIG_PPC64_ELF_ABI_V2 is enabled with clang through
CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2, building the powerpc boot wrapper
in 32-bit mode (i.e. with CONFIG_PPC64_BOOT_WRAPPER=n) fails with:

    error: unknown target ABI 'elfv2'

The ABI cannot be changed with '-m32'; GCC silently accepts it but clang
errors out. Only provide '-mabi=elfv2' when CONFIG_PPC64_BOOT_WRAPPER is
enabled, which is the only way '-mabi=elfv2' will be useful.

Tested-by: "Erhard F." <erhard_f@...lbox.org>
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/powerpc/boot/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index d32d95aea5d6..0d4a8e8bdcab 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -44,6 +44,9 @@ BOOTCFLAGS	+= -m64 -mcpu=powerpc64le
 else
 BOOTCFLAGS	+= -m64 -mcpu=powerpc64
 endif
+ifdef CONFIG_PPC64_ELF_ABI_V2
+BOOTCFLAGS	+= $(call cc-option,-mabi=elfv2)
+endif
 else
 BOOTCFLAGS	+= -m32 -mcpu=powerpc
 endif
@@ -55,9 +58,6 @@ BOOTCFLAGS	+= -mbig-endian
 else
 BOOTCFLAGS	+= -mlittle-endian
 endif
-ifdef CONFIG_PPC64_ELF_ABI_V2
-BOOTCFLAGS	+= $(call cc-option,-mabi=elfv2)
-endif
 
 BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -nostdinc
 

-- 
2.39.2