From: "tip-bot2 for Nathan Chancellor" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Nathan Chancellor <nathan@kernel.org>,
Borislav Petkov <bp@suse.de>, Ard Biesheuvel <ardb@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: x86/build] x86/boot: Add $(CLANG_FLAGS) to compressed KBUILD_CFLAGS
Date: Fri, 26 Mar 2021 13:13:30 -0000 [thread overview]
Message-ID: <161676441048.398.6354341807267354566.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210326000435.4785-3-nathan@kernel.org>
The following commit has been merged into the x86/build branch of tip:
Commit-ID: d5cbd80e302dfea59726c44c56ab7957f822409f
Gitweb: https://git.kernel.org/tip/d5cbd80e302dfea59726c44c56ab7957f822409f
Author: Nathan Chancellor <nathan@kernel.org>
AuthorDate: Thu, 25 Mar 2021 17:04:34 -07:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Fri, 26 Mar 2021 11:32:55 +01:00
x86/boot: Add $(CLANG_FLAGS) to compressed KBUILD_CFLAGS
When cross compiling x86 on an ARM machine with clang, there are several
errors along the lines of:
arch/x86/include/asm/string_64.h:27:10: error: invalid output constraint '=&c' in asm
This happens because the compressed boot Makefile reassigns KBUILD_CFLAGS
and drops the clang flags that set the target architecture ('--target=')
and the path to the GNU cross tools ('--prefix='), meaning that the host
architecture is targeted.
These flags are available as $(CLANG_FLAGS) from the main Makefile so
add them to the compressed boot folder's KBUILD_CFLAGS so that cross
compiling works as expected.
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lkml.kernel.org/r/20210326000435.4785-3-nathan@kernel.org
---
arch/x86/boot/compressed/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index e0bc398..6e5522a 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -46,6 +46,7 @@ KBUILD_CFLAGS += -D__DISABLE_EXPORTS
# Disable relocation relaxation in case the link is not PIE.
KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no)
KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
+KBUILD_CFLAGS += $(CLANG_FLAGS)
# sev-es.c indirectly inludes inat-table.h which is generated during
# compilation and stored in $(objtree). Add the directory to the includes so
next prev parent reply other threads:[~2021-03-26 13:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-26 0:04 [PATCH 0/3] Fix cross compiling x86 with clang Nathan Chancellor
2021-03-26 0:04 ` [PATCH 1/3] x86: Propagate $(CLANG_FLAGS) to $(REALMODE_FLAGS) Nathan Chancellor
2021-03-26 8:42 ` Sedat Dilek
2021-03-26 13:13 ` [tip: x86/build] x86/build: " tip-bot2 for John Millikin
2021-03-26 13:38 ` [PATCH 1/3] x86: " John Millikin
2021-03-26 0:04 ` [PATCH 2/3] x86/boot: Add $(CLANG_FLAGS) to compressed KBUILD_CFLAGS Nathan Chancellor
2021-03-26 13:13 ` tip-bot2 for Nathan Chancellor [this message]
2021-03-26 0:04 ` [PATCH 3/3] efi/libstub: Add $(CLANG_FLAGS) to x86 flags Nathan Chancellor
2021-03-26 13:13 ` [tip: x86/build] " tip-bot2 for Nathan Chancellor
2021-03-26 8:43 ` [PATCH 0/3] Fix cross compiling x86 with clang Ard Biesheuvel
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