This is a note to let you know that I've just added the patch titled
kbuild: replace AS=clang with LLVM_IAS=1
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kbuild-replace-as-clang-with-llvm_ias-1.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri 21 Aug 2020 04:30:09 PM CEST
From: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Date: Wed, 8 Apr 2020 10:36:22 +0900
Subject: kbuild: replace AS=clang with LLVM_IAS=1
From: Masahiro Yamada <masahiroy@xxxxxxxxxx>
commit 7e20e47c70f810d678d02941fa3c671209c4ca97 upstream.
The 'AS' variable is unused for building the kernel. Only the remaining
usage is to turn on the integrated assembler. A boolean flag is a better
fit for this purpose.
AS=clang was added for experts. So, I replaced it with LLVM_IAS=1,
breaking the backward compatibility.
Suggested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Documentation/kbuild/llvm.rst | 5 ++++-
Makefile | 2 +-
2 files changed, 5 insertions(+), 2 deletions(-)
--- a/Documentation/kbuild/llvm.rst
+++ b/Documentation/kbuild/llvm.rst
@@ -50,11 +50,14 @@ LLVM Utilities
LLVM has substitutes for GNU binutils utilities. These can be invoked as
additional parameters to `make`.
- make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
+ make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\
OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\
READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\
HOSTLD=ld.lld
+Currently, the integrated assembler is disabled by default. You can pass
+`LLVM_IAS=1` to enable it.
+
Getting Help
------------
--- a/Makefile
+++ b/Makefile
@@ -533,7 +533,7 @@ endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
endif
-ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),)
+ifneq ($(LLVM_IAS),1)
CLANG_FLAGS += -no-integrated-as
endif
CLANG_FLAGS += -Werror=unknown-warning-option
Patches currently in stable-queue which might be from masahiroy@xxxxxxxxxx are
queue-5.4/kbuild-support-llvm-1-to-switch-the-default-tools-to-clang-llvm.patch
queue-5.4/kbuild-remove-python2-variable.patch
queue-5.4/net-wan-wanxl-use-m68kcc-instead-of-m68kas-for-rebuilding-firmware.patch
queue-5.4/kbuild-remove-as-variable.patch
queue-5.4/net-wan-wanxl-use-allow-to-pass-cross_compile_m68k-for-rebuilding-firmware.patch
queue-5.4/kbuild-replace-as-clang-with-llvm_ias-1.patch
queue-5.4/documentation-llvm-fix-the-name-of-llvm-size.patch
queue-5.4/documentation-llvm-add-documentation-on-building-w-clang-llvm.patch
queue-5.4/x86-boot-kbuild-allow-readelf-executable-to-be-specified.patch
