[PATCH] kbuild: remove AS variable

[PATCH] kbuild: remove AS variable

[Masahiro Yamada]

As commit 5ef872636ca7 ("kbuild: get rid of misleading $(AS) from
documents") noted, we rarely use $(AS) in the kernel build.

Now that the only/last user of $(AS) in drivers/net/wan/Makefile was
converted to $(CC), $(AS) is no longer used in the build process.

You can still pass in AS=clang, which is just a switch to turn on
the LLVM integrated assembler.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 16d8271192d1..339e8c51a10b 100644
--- a/Makefile
+++ b/Makefile
@@ -405,7 +405,6 @@ KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 
 # Make variables (CC, etc...)
-AS		= $(CROSS_COMPILE)as
 LD		= $(CROSS_COMPILE)ld
 CC		= $(CROSS_COMPILE)gcc
 CPP		= $(CC) -E
@@ -472,7 +471,7 @@ KBUILD_LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
 CLANG_FLAGS :=
 
-export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
+export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
-- 
2.17.1

Re: [PATCH] kbuild: remove AS variable

[Nick Desaulniers]

Just noting that this got rolled up into a 3 patch series:
https://lore.kernel.org/lkml/CAKwvOdkjiyyt8Ju2j2O4cm1sB34rb_FTgjCRzEiXM6KL4muO_w@mail.gmail.com/T/#u

On Tue, Mar 24, 2020 at 9:15 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> As commit 5ef872636ca7 ("kbuild: get rid of misleading $(AS) from
> documents") noted, we rarely use $(AS) in the kernel build.
>
> Now that the only/last user of $(AS) in drivers/net/wan/Makefile was
> converted to $(CC), $(AS) is no longer used in the build process.
>
> You can still pass in AS=clang, which is just a switch to turn on
> the LLVM integrated assembler.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
>  Makefile | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 16d8271192d1..339e8c51a10b 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -405,7 +405,6 @@ KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
>  KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
>
>  # Make variables (CC, etc...)
> -AS             = $(CROSS_COMPILE)as
>  LD             = $(CROSS_COMPILE)ld
>  CC             = $(CROSS_COMPILE)gcc
>  CPP            = $(CC) -E
> @@ -472,7 +471,7 @@ KBUILD_LDFLAGS :=
>  GCC_PLUGINS_CFLAGS :=
>  CLANG_FLAGS :=
>
> -export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
> +export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
>  export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
>  export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
>  export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
> --
> 2.17.1
>
> --
> You received this message because you are subscribed to the Google Groups "Clang Built Linux" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200324161507.7414-1-masahiroy%40kernel.org.



-- 
Thanks,
~Nick Desaulniers

Re: [PATCH] kbuild: remove AS variable

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 2520 bytes --]

Hi Masahiro,

I love your patch! Yet something to improve:

[auto build test ERROR on kbuild/for-next]
[also build test ERROR on v5.6-rc7 next-20200326]
[cannot apply to sparc-next/master ipvs/master]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Masahiro-Yamada/kbuild-remove-AS-variable/20200326-034016
base:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next
config: x86_64-randconfig-d002-20200326 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 4b428e8f18c7006f69b3d4ef0fdf091d998d0941)
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> /bin/bash: --: invalid option
   Usage:	/bin/bash [GNU long option] [option] ...
   	/bin/bash [GNU long option] [option] script-file ...
   GNU long options:
   	--debug
   	--debugger
   	--dump-po-strings
   	--dump-strings
   	--help
   	--init-file
   	--login
   	--noediting
   	--noprofile
   	--norc
   	--posix
   	--pretty-print
   	--rcfile
   	--restricted
   	--verbose
   	--version
   Shell options:
   	-ilrsD or -c command or -O shopt_option		(invocation only)
   	-abefhkmnptuvxBCHP or -o option
   make[1]: *** [Makefile:1697: drivers] Error 2
   make[1]: Target '_all' not remade because of errors.
--
>> /bin/sh: 0: Illegal option --
   4 real  3 user  3 sys  164.71% cpu 	make distclean
--
>> /bin/sh: 0: Illegal option --
   3 real  0 user  1 sys  50.21% cpu 	make INSTALL_HDR_PATH=/tmp/usr/src/linux-headers-x86_64-randconfig-d002-20200326-e8c8c8d0ca995e05ef88ce20decd1c1134cda401 headers_install
--
>> /bin/sh: 0: Illegal option --
   14 real  3 user  9 sys  83.33% cpu 	make modules_prepare
--
>> /bin/sh: 0: Illegal option --
   4 real  3 user  1 sys  122.16% cpu 	make olddefconfig
--
>> /bin/sh: 0: Illegal option --
   21 real  21 user  11 sys  150.21% cpu 	make prepare

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 36677 bytes --]