Guys,
I've been trying to debug a linker error (which I thought was a bug in
my optimization.) Well it turns out it occurs in a brand new virgin
version of the compiler running with binutils 2.36 which is the latest
version. I'm posting this on both the binutils list and gcc list
because people of either list are just as likely to have an idea about
what's going on. Note, I tried to walk though the ld code in gdb but
it's nontrivial trying figure out why an error occured. I can't just
set a watch point on a flag because, at least in some places it seems
like the default state of the flag is failure and the code then
proceeds to try various things to see if they'll work.
Regarding the compiler that I built:
$ git status
On branch master
Your branch is up to date with 'origin/master'.
nothing to commit, working tree clean
Now here is how I built it:
./my_dual_build_script gcc_virgin_build 2>build_log_virgin 1>&2
where my_dual_build_script is:
cd $1
BASE=`pwd`
echo BASE = $BASE
touch BU_objdir objdir install
rm -rf BU_objdir objdir install
mkdir BU_objdir objdir install
cd BU_objdir
echo BUILDING BINUTILS IN `pwd`
../binutils-2.36/configure --prefix=$BASE/install
make CFLAGS='-O2 -g' CXXFLAGS='-O2 -g' -j 12
##make CFLAGS='-O0 -g' CXXFLAGS='-O2 -g' -j 12
make install
cd ../objdir
echo BUILDING GCC IN `pwd`
../sources/configure --prefix=$BASE/install --disable-bootstrap
-enable-language=c,c++,lto --disable-multilib --enable-valgrind-annotations
##make CFLAGS='-O0 -g' CXXFLAGS='-O0 -g' -j 12
make CFLAGS='-O2 -g' CXXFLAGS='-O2 -g' -j 12
make install
My installed gcc is:
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.5.0-3ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --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 --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
My istalled binutils are:
$ ld -v
GNU ld (GNU Binutils for Ubuntu) 2.30
Now the application that failing during testing is 505.x264_5 which is
from SPEC17. Note, please don't try to duplicate this bug unless you
have access to SPEC17 and are running an identical system because
Martin Liska tried to do this on a different system but but he
couldn't get it to duplicate.
Now for any SPEC heads out there here's the germane parts
from its confige file.
define gcc_dir /home/gary/gcc_virgin_build/install
preENV_LD_LIBRARY_PATH = %{gcc_dir}/lib64/:%{gcc_dir}/lib/:/lib64
SPECLANG = %{gcc_dir}/bin/
CC = $(SPECLANG)gcc --verbose -std=c99 %{model}
CXX = $(SPECLANG)g++ -std=c++03 %{model}
FC = $(SPECLANG)gfortran %{model}
OPTIMIZE = -O2 -v -Wl,--verbose=11111 -Wl,-debug
COPTIMIZE = -save-temps
Finally here linker's part of the x264 build output:
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../x86_64-pc-linux-gnu/bin/ld
-plugin
/home/gary/gcc_virgin_build/install/libexec/gcc/x86_64-pc-linux-gnu/11.0.1/liblto_plugin.so
-plugin-opt=/home/gary/gcc_virgin_build/install/libexec/gcc/x86_64-pc-linux-gnu/11.0.1/lto-wrapper
-plugin-opt=-fresolution=ldecod_r.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
--eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o
ldecod_r /usr/lib/x86_64-linux-gnu/crt1.o /usr/lib/x86_64-linux-gnu/crti.o
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/crtbegin.o
-L/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1
-L/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../lib64
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../x86_64-pc-linux-gnu/lib
-L/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../..
--verbose=11111 ldecod_src/nal.o ldecod_src/mbuffer_mvc.o ldecod_src/image.o
ldecod_src/mb_access.o ldecod_src/memalloc.o ldecod_src/mc_prediction.o
ldecod_src/mb_prediction.o ldecod_src/intra4x4_pred_mbaff.o
ldecod_src/loop_filter_mbaff.o ldecod_src/context_ini.o ldecod_src/configfile.o
ldecod_src/cabac.o ldecod_src/sei.o ldecod_src/leaky_bucket.o
ldecod_src/filehandle.o ldecod_src/errorconcealment.o ldecod_src/decoder_test.o
ldecod_src/img_process.o ldecod_src/mv_prediction.o ldecod_src/fmo.o
ldecod_src/output.o ldecod_src/mc_direct.o ldecod_src/rtp.o
ldecod_src/nalucommon.o ldecod_src/config_common.o
ldecod_src/intra_chroma_pred.o ldecod_src/transform8x8.o
ldecod_src/blk_prediction.o ldecod_src/intra8x8_pred_mbaff.o
ldecod_src/erc_do_i.o ldecod_src/io_tiff.o ldecod_src/mbuffer.o
ldecod_src/block.o ldecod_src/intra4x4_pred.o ldecod_src/transform.o
ldecod_src/annexb.o ldecod_src/ldecod.o ldecod_src/macroblock.o
ldecod_src/vlc.o ldecod_src/parset.o ldecod_src/loop_filter_normal.o
ldecod_src/parsetcommon.o ldecod_src/erc_do_p.o ldecod_src/loopFilter.o
ldecod_src/intra16x16_pred_mbaff.o ldecod_src/intra4x4_pred_normal.o
ldecod_src/intra16x16_pred_normal.o ldecod_src/win32.o
ldecod_src/intra16x16_pred.o ldecod_src/intra8x8_pred_normal.o
ldecod_src/io_raw.o ldecod_src/img_io.o ldecod_src/nalu.o ldecod_src/quant.o
ldecod_src/intra8x8_pred.o ldecod_src/erc_api.o ldecod_src/header.o
ldecod_src/biaridecod.o ldecod_src/input.o -lm -lgcc --push-state --as-needed
-lgcc_s --pop-state -lc -lgcc --push-state --as-needed -lgcc_s --pop-state
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/crtend.o
/usr/lib/x86_64-linux-gnu/crtn.o
GNU ld (GNU Binutils) 2.36
Supported emulations:
elf_x86_64
elf32_x86_64
elf_i386
elf_iamcu
elf_l1om
elf_k1om
using internal linker script:
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/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../x86_64-pc-linux-gnu/bin/ld:
mode elf_x86_64
attempt to open /usr/lib/x86_64-linux-gnu/crt1.o succeeded
/usr/lib/x86_64-linux-gnu/crt1.o
attempt to open /usr/lib/x86_64-linux-gnu/crti.o succeeded
/usr/lib/x86_64-linux-gnu/crti.o
attempt to open
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/crtbegin.o
succeeded
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/crtbegin.o
attempt to open ldecod_src/nal.o succeeded
ldecod_src/nal.o
attempt to open ldecod_src/mbuffer_mvc.o succeeded
ldecod_src/mbuffer_mvc.o
attempt to open ldecod_src/image.o succeeded
ldecod_src/image.o
attempt to open ldecod_src/mb_access.o succeeded
ldecod_src/mb_access.o
attempt to open ldecod_src/memalloc.o succeeded
ldecod_src/memalloc.o
attempt to open ldecod_src/mc_prediction.o succeeded
ldecod_src/mc_prediction.o
attempt to open ldecod_src/mb_prediction.o succeeded
ldecod_src/mb_prediction.o
attempt to open ldecod_src/intra4x4_pred_mbaff.o succeeded
ldecod_src/intra4x4_pred_mbaff.o
attempt to open ldecod_src/loop_filter_mbaff.o succeeded
ldecod_src/loop_filter_mbaff.o
attempt to open ldecod_src/context_ini.o succeeded
ldecod_src/context_ini.o
attempt to open ldecod_src/configfile.o succeeded
ldecod_src/configfile.o
attempt to open ldecod_src/cabac.o succeeded
ldecod_src/cabac.o
attempt to open ldecod_src/sei.o succeeded
ldecod_src/sei.o
attempt to open ldecod_src/leaky_bucket.o succeeded
ldecod_src/leaky_bucket.o
attempt to open ldecod_src/filehandle.o succeeded
ldecod_src/filehandle.o
attempt to open ldecod_src/errorconcealment.o succeeded
ldecod_src/errorconcealment.o
attempt to open ldecod_src/decoder_test.o succeeded
ldecod_src/decoder_test.o
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../x86_64-pc-linux-gnu/bin/ld:
ldecod_src/decoder_test.o:(.bss+0x0): multiple definition of `cfgparams';
ldecod_src/configfile.o:(.bss+0x0): first defined here
attempt to open ldecod_src/img_process.o succeeded
ldecod_src/img_process.o
attempt to open ldecod_src/mv_prediction.o succeeded
ldecod_src/mv_prediction.o
attempt to open ldecod_src/fmo.o succeeded
ldecod_src/fmo.o
attempt to open ldecod_src/output.o succeeded
ldecod_src/output.o
attempt to open ldecod_src/mc_direct.o succeeded
ldecod_src/mc_direct.o
attempt to open ldecod_src/rtp.o succeeded
ldecod_src/rtp.o
attempt to open ldecod_src/nalucommon.o succeeded
ldecod_src/nalucommon.o
attempt to open ldecod_src/config_common.o succeeded
ldecod_src/config_common.o
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../x86_64-pc-linux-gnu/bin/ld:
ldecod_src/config_common.o:(.bss+0x0): multiple definition of `cfgparams';
ldecod_src/configfile.o:(.bss+0x0): first defined here
attempt to open ldecod_src/intra_chroma_pred.o succeeded
ldecod_src/intra_chroma_pred.o
attempt to open ldecod_src/transform8x8.o succeeded
ldecod_src/transform8x8.o
attempt to open ldecod_src/blk_prediction.o succeeded
ldecod_src/blk_prediction.o
attempt to open ldecod_src/intra8x8_pred_mbaff.o succeeded
ldecod_src/intra8x8_pred_mbaff.o
attempt to open ldecod_src/erc_do_i.o succeeded
ldecod_src/erc_do_i.o
attempt to open ldecod_src/io_tiff.o succeeded
ldecod_src/io_tiff.o
attempt to open ldecod_src/mbuffer.o succeeded
ldecod_src/mbuffer.o
attempt to open ldecod_src/block.o succeeded
ldecod_src/block.o
attempt to open ldecod_src/intra4x4_pred.o succeeded
ldecod_src/intra4x4_pred.o
attempt to open ldecod_src/transform.o succeeded
ldecod_src/transform.o
attempt to open ldecod_src/annexb.o succeeded
ldecod_src/annexb.o
attempt to open ldecod_src/ldecod.o succeeded
ldecod_src/ldecod.o
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ldecod_src/macroblock.o
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ldecod_src/vlc.o
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ldecod_src/parset.o
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ldecod_src/loop_filter_normal.o
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ldecod_src/parsetcommon.o
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ldecod_src/erc_do_p.o
attempt to open ldecod_src/loopFilter.o succeeded
ldecod_src/loopFilter.o
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ldecod_src/intra16x16_pred_mbaff.o
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ldecod_src/intra4x4_pred_normal.o
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ldecod_src/intra16x16_pred_normal.o
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ldecod_src/win32.o
attempt to open ldecod_src/intra16x16_pred.o succeeded
ldecod_src/intra16x16_pred.o
attempt to open ldecod_src/intra8x8_pred_normal.o succeeded
ldecod_src/intra8x8_pred_normal.o
attempt to open ldecod_src/io_raw.o succeeded
ldecod_src/io_raw.o
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ldecod_src/img_io.o
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ldecod_src/nalu.o
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ldecod_src/quant.o
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ldecod_src/intra8x8_pred.o
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ldecod_src/header.o
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ldecod_src/input.o
attempt to open
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/libm.so
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opened script file /usr/lib/x86_64-linux-gnu/libm.so
/usr/lib/x86_64-linux-gnu/libm.so
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opened script file
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(/usr/lib/x86_64-linux-gnu/libc_nonshared.a)elf-init.oS
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/usr/lib/x86_64-linux-gnu/libc_nonshared.a
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opened script file
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../lib64/libgcc_s.so
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../lib64/libgcc_s.so
opened script file
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succeeded
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attempt to open
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failed
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/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/libgcc.a
succeeded
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/libgcc.a
attempt to open
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/crtend.o
succeeded
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/crtend.o
attempt to open /usr/lib/x86_64-linux-gnu/crtn.o succeeded
/usr/lib/x86_64-linux-gnu/crtn.o
ld-linux-x86-64.so.2 needed by /lib/x86_64-linux-gnu/libm.so.6
found ld-linux-x86-64.so.2 at /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
/home/gary/gcc_virgin_build/install/lib/gcc/x86_64-pc-linux-gnu/11.0.1/../../../../x86_64-pc-linux-gnu/bin/ld:
link errors found, deleting executable `ldecod_r'
collect2: error: ld returned 1 exit status
specmake: *** [/home/gary/spec/cpu2017/benchspec/Makefile.defaults:337:
ldecod_r] Error 1
Thanks
Gary
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