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Subject: Re: [kbuild-all] Re: gcc-5: error: -gz is not supported in this
 configuration
To:     Fangrui Song <maskray@google.com>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        kernel test robot <lkp@intel.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        kbuild-all@lists.01.org, LKML <linux-kernel@vger.kernel.org>
References: <202006092115.nevT7m8D%lkp@intel.com>
 <CAKwvOd=jjFS7XOWyYMZgLTYJtZ7uc=4dP-S4VhuyjNmT=2EcPw@mail.gmail.com>
 <20200609174954.cckelwl6etwztmhv@google.com>
 <05c88916-7d91-ad1a-1ea6-15167a994a0b@intel.com>
 <20200610005830.s6gus7r3umwgzozk@google.com>
From:   Rong Chen <rong.a.chen@intel.com>
Message-ID: <c2c2c2db-439f-5c60-068d-e53adbe960c1@intel.com>
Date:   Wed, 10 Jun 2020 09:49:01 +0800
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On 6/10/20 8:58 AM, Fangrui Song wrote:
> On 2020-06-10, Rong Chen wrote:
>>
>>
>> On 6/10/20 1:49 AM, Fangrui Song wrote:
>>> On 2020-06-09, Nick Desaulniers wrote:
>>>> On Tue, Jun 9, 2020 at 6:12 AM kernel test robot <lkp@intel.com> 
>>>> wrote:
>>>>>
>>>>> tree: 
>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
>>>>> master
>>>>> head:   abfbb29297c27e3f101f348dc9e467b0fe70f919
>>>>> commit: 10e68b02c861ccf2b3adb59d3f0c10dc6b5e3ace Makefile: support 
>>>>> compressed debug info
>>>>> date:   12 days ago
>>>>> config: x86_64-randconfig-r032-20200609 (attached as .config)
>>>>> compiler: gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010
>>>>> reproduce (this is a W=1 build):
>>>>>         git checkout 10e68b02c861ccf2b3adb59d3f0c10dc6b5e3ace
>>>>>         # save the attached .config to linux build tree
>>>>>         make W=1 ARCH=x86_64
>>>>>
>>>>> If you fix the issue, kindly add following tag as appropriate
>>>>> Reported-by: kernel test robot <lkp@intel.com>
>>>>>
>>>>> All errors (new ones prefixed by >>, old ones prefixed by <<):
>>>>>
>>>>>>> gcc-5: error: -gz is not supported in this configuration
>>>>
>>>> Hmm...I wonder if the feature detection is incomplete?  I suspect it's
>>>> possible to not depend on zlib.
>>>>
>>>>> make[2]: *** [scripts/Makefile.build:277: scripts/mod/empty.o] 
>>>>> Error 1
>>>>> make[2]: Target '__build' not remade because of errors.
>>>>> make[1]: *** [Makefile:1169: prepare0] Error 2
>>>>> make[1]: Target 'prepare' not remade because of errors.
>>>>> make: *** [Makefile:185: __sub-make] Error 2
>>>
>>> The output of gcc-5 -v --version on that machine may help. The
>>> convoluted gcc_cv_ld_compress_de logic in gcc/configure.ac may be
>>> related, but I can't find any mistake that our
>>> CONFIG_DEBUG_INFO_COMPRESSED conditions may make.
>>
>> Hi Fangrui,
>>
>> Here is the output:
>>
>> $gcc-5 -v --version
>> Using built-in specs.
>> COLLECT_GCC=gcc-5
>> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
>> gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010
>> Copyright (C) 2015 Free Software Foundation, Inc.
>> This is free software; see the source for copying conditions. There 
>> is NO
>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
>> PURPOSE.
>>
>>
>> Target: x86_64-linux-gnu
>> Configured with: ../src/configure -v --with-pkgversion='Ubuntu 
>> 5.5.0-12ubuntu1' 
>> --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs 
>> --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr 
>> --program-suffix=-5 --enable-shared --enable-linker-build-id 
>> --libexecdir=/usr/lib --without-included-gettext 
>> --enable-threads=posix --libdir=/usr/lib --enable-nls 
>> --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug 
>> --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new 
>> --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx 
>> --enable-plugin --enable-default-pie --with-system-zlib 
>> --enable-objc-gc --enable-multiarch --disable-werror 
>> --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 
>> --enable-multilib --with-tune=generic --enable-checking=release 
>> --build=x86_64-linux-gnu --host=x86_64-linux-gnu 
>> --target=x86_64-linux-gnu
>> Thread model: posix
>> gcc version 5.5.0 20171010 (Ubuntu 5.5.0-12ubuntu1)
>> COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
>>  /usr/lib/gcc/x86_64-linux-gnu/5/cc1 -quiet -v -imultiarch 
>> x86_64-linux-gnu help-dummy -quiet -dumpbase help-dummy 
>> -mtune=generic -march=x86-64 -auxbase help-dummy -version --version 
>> -fstack-protector-strong -Wformat -Wformat-security -o /tmp/ccqnZumV.s
>> GNU C11 (Ubuntu 5.5.0-12ubuntu1) version 5.5.0 20171010 
>> (x86_64-linux-gnu)
>>         compiled by GNU C version 5.5.0 20171010, GMP version 6.1.2, 
>> MPFR version 4.0.1, MPC version 1.1.0
>> warning: MPFR header version 4.0.1 differs from library version 4.0.2.
>> GGC heuristics: --param ggc-min-expand=100 --param 
>> ggc-min-heapsize=131072
>> COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
>>  as -v --64 --version -o /tmp/ccRPgs9J.o /tmp/ccqnZumV.s
>> GNU assembler version 2.34 (x86_64-linux-gnu) using BFD version (GNU 
>> Binutils for Ubuntu) 2.34
>> GNU assembler (GNU Binutils for Ubuntu) 2.34
>> Copyright (C) 2020 Free Software Foundation, Inc.
>> This program is free software; you may redistribute it under the 
>> terms of
>> the GNU General Public License version 3 or later.
>> This program has absolutely no warranty.
>> This assembler was configured for a target of `x86_64-linux-gnu'.
>> COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/ 
>>
>> LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../:/lib/:/usr/lib/ 
>>
>> COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
>>  /usr/lib/gcc/x86_64-linux-gnu/5/collect2 -plugin 
>> /usr/lib/gcc/x86_64-linux-gnu/5/liblto_plugin.so 
>> -plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper 
>> -plugin-opt=-fresolution=/tmp/ccJLhs3y.res 
>> -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s 
>> -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc 
>> -plugin-opt=-pass-through=-lgcc_s --sysroot=/ --build-id 
>> --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed 
>> -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -z now -z relro 
>> --version 
>> /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/Scrt1.o 
>> /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o 
>> /usr/lib/gcc/x86_64-linux-gnu/5/crtbeginS.o 
>> -L/usr/lib/gcc/x86_64-linux-gnu/5 
>> -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu 
>> -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib 
>> -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu 
>> -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/5/../../.. 
>> /tmp/ccRPgs9J.o -lgcc --push-state --as-needed -lgcc_s --pop-state 
>> -lc -lgcc --push-state --as-needed -lgcc_s --pop-state 
>> /usr/lib/gcc/x86_64-linux-gnu/5/crtend.o 
>> /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crtn.o
>> collect2 version 5.5.0 20171010
>> /usr/bin/ld -plugin /usr/lib/gcc/x86_64-linux-gnu/5/liblto_plugin.so 
>> -plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper 
>> -plugin-opt=-fresolution=/tmp/ccJLhs3y.res 
>> -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s 
>> -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc 
>> -plugin-opt=-pass-through=-lgcc_s --sysroot=/ --build-id 
>> --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed 
>> -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -z now -z relro 
>> --version 
>> /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/Scrt1.o 
>> /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o 
>> /usr/lib/gcc/x86_64-linux-gnu/5/crtbeginS.o 
>> -L/usr/lib/gcc/x86_64-linux-gnu/5 
>> -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu 
>> -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib 
>> -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu 
>> -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/5/../../.. 
>> /tmp/ccRPgs9J.o -lgcc --push-state --as-needed -lgcc_s --pop-state 
>> -lc -lgcc --push-state --as-needed -lgcc_s --pop-state 
>> /usr/lib/gcc/x86_64-linux-gnu/5/crtend.o 
>> /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crtn.o
>> GNU ld (GNU Binutils for Ubuntu) 2.34
>> Copyright (C) 2020 Free Software Foundation, Inc.
>> This program is free software; you may redistribute it under the 
>> terms of
>> the GNU General Public License version 3 or (at your option) a later 
>> version.
>> This program has absolutely no warranty.
>>
>> Best Regards,
>> Rong Chen
>
> Hi Rong,
>
> binutils (both GNU as and GNU ld) is new. It oughts to support
> --compress-debug-sections=zlib . The failure looks strange to me.
>
> Can you extract the gcc-5 command line building scripts/mod/empty.o
> and run it manually? 

$ gcc-5 -Wp,-MMD,scripts/mod/.empty.o.d  -nostdinc -isystem 
/usr/lib/gcc/x86_64-linux-gnu/5/include -I./arch/x86/include 
-I./arch/x86/include/generated  -I./include -I./arch/x86/include/uapi 
-I./arch/x86/include/generated/uapi -I./include/uapi 
-I./include/generated/uapi -include ./include/linux/kconfig.h -include 
./include/linux/compiler_types.h -D__KERNEL__ -Wall -Wundef 
-Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing 
-fno-common -fshort-wchar -fno-PIE -Werror=implicit-function-declaration 
-Werror=implicit-int -Wno-format-security -std=gnu89 -mno-sse -mno-mmx 
-mno-sse2 -mno-3dnow -mno-avx -m64 -falign-jumps=1 -falign-loops=1 
-mno-80387 -mno-fp-ret-in-387 -mpreferred-stack-boundary=3 
-mskip-rax-setup -mtune=generic -mno-red-zone -mcmodel=kernel 
-DCONFIG_X86_X32_ABI -Wno-sign-compare -fno-asynchronous-unwind-tables 
-mindirect-branch=thunk-extern -mindirect-branch-register 
-fno-jump-tables -fno-delete-null-pointer-checks -Os 
--param=allow-store-data-races=0 -Wframe-larger-than=2048 
-fstack-protector-strong -Wno-unused-but-set-variable 
-fno-omit-frame-pointer -fno-optimize-sibling-calls 
-fno-var-tracking-assignments -g -gdwarf-4 -femit-struct-debug-baseonly 
-fno-var-tracking -gz=zlib -Wdeclaration-after-statement -Wvla 
-Wno-pointer-sign -DKBUILD_MODFILE='"scripts/mod/empty"' 
-DKBUILD_BASENAME='"empty"' -DKBUILD_MODNAME='"empty"' -c -o 
scripts/mod/empty.o scripts/mod/empty.c
gcc-5: error: -gz is not supported in this configuration

> Also run gcc-5 -g -gz=zlib a.c -c on a trivial file and check whether 
> `readelf -WS a.o`
> has the section flag C ("compressed").

$ gcc-5 -g -gz=zlib a.c -c
gcc-5: error: -gz is not supported in this configuration

and no a.o generated.

Best Regards,
Rong Chen