When building mips tinyconifg the following warning show up
make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang
/srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit
.pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3:
^
/srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit
.section .mips_abiflags, "a"
^
Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless
LLVM_IAS is defined.
Link: https://github.com/ClangBuiltLinux/linux/issues/1256
Cc: [email protected] # v4.19+
Suggested-by: Nick Desaulniers <[email protected]>
Signed-off-by: Anders Roxell <[email protected]>
---
arch/mips/vdso/Makefile | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index 5810cc12bc1d..83e8cf216ac8 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -26,6 +26,10 @@ ifdef CONFIG_CC_IS_CLANG
ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
endif
+ifneq ($(LLVM_IAS),1)
+ccflags-vdso += -no-integrated-as
+endif
+
#
# The -fno-jump-tables flag only prevents the compiler from generating
# jump tables but does not prevent the compiler from emitting absolute
--
2.29.2
On Fri, Jan 15, 2021 at 08:13:30PM +0100, Anders Roxell wrote:
> When building mips tinyconifg the following warning show up
>
> make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang
> /srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit
> .pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3:
> ^
> /srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit
> .section .mips_abiflags, "a"
> ^
>
> Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless
> LLVM_IAS is defined.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1256
> Cc: [email protected] # v4.19+
> Suggested-by: Nick Desaulniers <[email protected]>
> Signed-off-by: Anders Roxell <[email protected]>
I believe this is the better solution:
https://lore.kernel.org/r/[email protected]/
Cheers,
Nathan
On Fri, 15 Jan 2021 at 20:28, Nathan Chancellor
<[email protected]> wrote:
>
> On Fri, Jan 15, 2021 at 08:13:30PM +0100, Anders Roxell wrote:
> > When building mips tinyconifg the following warning show up
> >
> > make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang
> > /srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit
> > .pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3:
> > ^
> > /srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit
> > .section .mips_abiflags, "a"
> > ^
> >
> > Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless
> > LLVM_IAS is defined.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/1256
> > Cc: [email protected] # v4.19+
> > Suggested-by: Nick Desaulniers <[email protected]>
> > Signed-off-by: Anders Roxell <[email protected]>
>
> I believe this is the better solution:
>
> https://lore.kernel.org/r/[email protected]/
Yes, I agree.
Cheers,
Anders
On 2021-01-15, Anders Roxell wrote:
>On Fri, 15 Jan 2021 at 20:28, Nathan Chancellor
><[email protected]> wrote:
>>
>> On Fri, Jan 15, 2021 at 08:13:30PM +0100, Anders Roxell wrote:
>> > When building mips tinyconifg the following warning show up
>> >
>> > make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang
>> > /srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit
>> > .pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3:
>> > ^
>> > /srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit
>> > .section .mips_abiflags, "a"
>> > ^
>> >
>> > Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless
>> > LLVM_IAS is defined.
>> >
>> > Link: https://github.com/ClangBuiltLinux/linux/issues/1256
>> > Cc: [email protected] # v4.19+
>> > Suggested-by: Nick Desaulniers <[email protected]>
>> > Signed-off-by: Anders Roxell <[email protected]>
>>
>> I believe this is the better solution:
>>
>> https://lore.kernel.org/r/[email protected]/
>
>Yes, I agree.
>
>Cheers,
>Anders
http://lore.kernel.org/r/[email protected]
Personally I'd drop DWARF v2 as an option.
On Fri, Jan 15, 2021 at 12:13 PM Fangrui Song <[email protected]> wrote:
>
> http://lore.kernel.org/r/[email protected]
> Personally I'd drop DWARF v2 as an option.
WIP :P
--
Thanks,
~Nick Desaulniers
Hi Anders,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v5.11-rc3 next-20210115]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Anders-Roxell/mips-vdso-fix-DWARF2-warning/20210116-031903
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5ee88057889bbca5f5bb96031b62b3756b33e164
config: mips-cavium_octeon_defconfig (attached as .config)
compiler: mips64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/242da1138d05b84d92be2e0a06d6e3fb40c752de
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Anders-Roxell/mips-vdso-fix-DWARF2-warning/20210116-031903
git checkout 242da1138d05b84d92be2e0a06d6e3fb40c752de
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All errors (new ones prefixed by >>):
>> mips64-linux-gcc: error: unrecognized command line option '-no-integrated-as'; did you mean '-no-integrated-cpp'?
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
Hi Anders,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v5.11-rc3 next-20210115]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Anders-Roxell/mips-vdso-fix-DWARF2-warning/20210116-031903
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5ee88057889bbca5f5bb96031b62b3756b33e164
config: mips-randconfig-p001-20210115 (attached as .config)
compiler: mips-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/242da1138d05b84d92be2e0a06d6e3fb40c752de
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Anders-Roxell/mips-vdso-fix-DWARF2-warning/20210116-031903
git checkout 242da1138d05b84d92be2e0a06d6e3fb40c752de
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All errors (new ones prefixed by >>):
>> mips-linux-gcc: error: unrecognized command line option '-no-integrated-as'; did you mean '-no-integrated-cpp'?
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]