Hello! Should you find that this is a real bug and want to file it, I have created you a bugzilla account! You will receive an email with information on how to reset your default password and access your account! Please read through https://www.gnu.org/software/gcc/bugs/ before commenting so that you can provide the developers with all the information they need to help resolve the problem as quickly as possible. Most importantly, thank you for contributing to GCC! Thanks, Will On Thu, Oct 15, 2020 at 5:43 AM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: > > Compared to good ones(without -flto option), the reason for this issue seems debug-dump of ELF file is missing File Name Table and Line Number Statements, which addr2line will read. With -flto, doesn't have these fields in so. Without flto, they are there. > > > The File Name Table (offset 0xb2): > Entry Dir Time Size Name > 1 1 0 0 test.c > 2 2 0 0 stddef.h > 3 3 0 0 types.h > 4 3 0 0 libio.h > 5 4 0 0 stdio.h > 6 3 0 0 sys_errlist.h > > Line Number Statements: > [0x000000fb] Extended opcode 2: set Address to 0x65a > [0x00000106] Special opcode 7: advance Address by 0 to 0x65a and Line by 2 to 3 > [0x00000107] Special opcode 62: advance Address by 4 to 0x65e and Line by 1 to 4 > [0x00000108] Special opcode 174: advance Address by 12 to 0x66a and Line by 1 to 5 > [0x00000109] Special opcode 49: advance Address by 3 to 0x66d and Line by 2 to 7 > [0x0000010a] Special opcode 62: advance Address by 4 to 0x671 and Line by 1 to 8 > [0x0000010b] Special opcode 146: advance Address by 10 to 0x67b and Line by 1 to 9 > [0x0000010c] Advance PC by 2 to 0x67d > [0x0000010e] Extended opcode 1: End of Sequence > > > > On Thu, Oct 15, 2020 at 5:06 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >> >> # /usr/bin/addr2line -e libtime_opt.so -f 0x65a >> foo >> ??:? >> >> # readelf -a libtime_opt.so | grep foo >> 000000201020 000700000007 R_X86_64_JUMP_SLO 000000000000065a foo + 0 >> 7: 000000000000065a 18 FUNC GLOBAL DEFAULT 12 foo >> 46: 000000000000065a 18 FUNC GLOBAL DEFAULT 12 foo >> >> # objdump -dlSC libtime_opt.so --start-address=0x650 --stop-address=0x65f >> >> libtime_opt.so: file format elf64-x86-64 >> >> >> Disassembly of section .text: >> >> 0000000000000650 <frame_dummy>: >> frame_dummy(): >> 650: 55 push %rbp >> 651: 48 89 e5 mov %rsp,%rbp >> 654: 5d pop %rbp >> 655: e9 66 ff ff ff jmpq 5c0 <register_tm_clones> >> >> 000000000000065a <foo>: >> foo(): >> 65a: 55 push %rbp >> 65b: 48 89 e5 mov %rsp,%rbp >> 65e: 48 rex.W >> >> On Thu, Oct 15, 2020 at 4:55 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>> >>> Is it a bug? Can I create an account in bugzilla? Thanks in advance:) >>> >>> readelf and objdump works fine, only addr2line is not working. >>> >>> On Thu, Oct 15, 2020 at 4:53 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>> >>>> symbol will appear when I remove flto in CMakeLists.txt. But I have to enable flto.. >>>> >>>> On Thu, Oct 15, 2020 at 4:40 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>> >>>>> I tried to reproduce with ubuntu, with this zip. >>>>> >>>>> Could you please give a hand about this issue? thanks indeed, seems no matter what gcc version above 9.1.0, will also have this issue. >>>>> >>>>> ## Reproduce step >>>>> cd build >>>>> cmake .. >>>>> make >>>>> readelf -a libtime_opt.so | grep foo >>>>> >>>>> output is: >>>>> 00000201020 000a00000007 R_X86_64_JUMP_SLO 000000000000066a _Z3foov + 0 >>>>> 10: 000000000000066a 18 FUNC GLOBAL DEFAULT 12 _Z3foov >>>>> 49: 000000000000066a 18 FUNC GLOBAL DEFAULT 12 _Z3foov >>>>> >>>>> addr2line -e libtime_opt.so -f 0x66a >>>>> >>>>> output is: >>>>> _Z3foov >>>>> ??:? >>>>> >>>>> ./Jianyue >>>>> >>>>> On Wed, Oct 14, 2020 at 5:24 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>> >>>>>> Seems gcc help is missing, add back gcc help >>>>>> >>>>>> On Wed, Oct 14, 2020 at 5:22 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>>> >>>>>>> When try to check Line Table, seems there are many errors saying There is a hole. I checked the OK version, seems also has holes, but not so many holes;-) >>>>>>> >>>>>>> # readelf --debug-dump=loc libfoo.so | head >>>>>>> readelf: libfoo.so: Warning: Location lists in .debug_loc section start at 0x6 >>>>>>> readelf: libfoo.so: Warning: There is a hole [0x52 - 0x54] in .debug_loc section. >>>>>>> readelf: libfoo.so: Warning: There is a hole [0x77 - 0x7d] in .debug_loc section. >>>>>>> readelf: libfoo.so: Warning: There is a hole [0xc6 - 0xd2] in .debug_loc section. >>>>>>> Contents of the .debug_loc section: >>>>>>> readelf: libfoo.so: Warning: >>>>>>> There is a hole [0x157 - 0x163] in .debug_loc section. >>>>>>> Offset Begin End Expression >>>>>>> 00000006 0000000000257a70 0000000000257a81 (DW_OP_reg5 (rdi)) >>>>>>> 00000019 0000000000257a81 0000000000257aae (DW_OP_reg6 (rbp)) >>>>>>> 0000002c 0000000000257aae 0000000000257aaf (DW_OP_GNU_entry_value: (DW_OP_reg5 (rdi)); DW_OP_stack_value) >>>>>>> 00000042 <End of list> >>>>>>> readelf: libfoo.so: Warning: There is a hole [0x1fa - 0x202] in .debug_loc section. >>>>>>> 00000054 0000000000257a8e 0000000000257a98 (DW_OP_reg3 (rbx)) >>>>>>> 00000067 <End of list> >>>>>>> 0000007d 0000000000257a7c 0000000000257a8e (DW_OP_reg3 (rbx)) >>>>>>> readelf: libfoo.so: Warning: There is a hole [0x25e - 0x260] in .debug_loc section. >>>>>>> >>>>>>> On Wed, Oct 14, 2020 at 4:30 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>>>> >>>>>>>> Also tried -flto=thin -ffat-lto-objects, result seems same, still can't find file and line. >>>>>>>> >>>>>>>> On Wed, Oct 14, 2020 at 2:58 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>>>>> >>>>>>>>> x86_64-pc-linux-gnu-gcc *.a(many internal .a, checked, they all built with gcc 9.1.0) -ldpdk -Wl,--no-whole-archive -lz -llzma -lcurl -lssl -lcrypto -lcrypt -lcap -lpthread -lrt -lstdc++ -ldl -lm -lsctp -lpcap -lminizip -o libfoo.so >>>>>>>>> >>>>>>>>> >>>>>>>>> On Wed, Oct 14, 2020 at 2:56 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>>>>>> >>>>>>>>>> It has different static libraries, shared libraries, so different GCC used, like 6.4.1(assume from other shared libraries), project itself is using 9.1.0. >>>>>>>>>> >>>>>>>>>> On Wed, Oct 14, 2020 at 2:54 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>>>>>>> >>>>>>>>>>> I also tried to use -flto -fno-fat-lto-objects, but seems still not working. >>>>>>>>>>> >>>>>>>>>>> strings -a libfoo.so | grep GNU.*march >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=corei7 -g -O2 -O3 -feliminate-unused-debug-types -fPIC >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=corei7 -mavx2 -g -O2 -O3 -feliminate-unused-debug-types -fPIC >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=corei7 -g -O2 -feliminate-unused-debug-types -fPIC >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=corei7 -g -O2 -O3 -feliminate-unused-debug-types -fno-strict-aliasing -fPIC >>>>>>>>>>> GNU C99 9.1.0 -m64 -march=corei7 -g -O2 -O3 -std=gnu99 -feliminate-unused-debug-types -fPIC >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=corei7 -g -O2 -O3 -feliminate-unused-debug-types -flax-vector-conversions -fPIC >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=corei7 -g -O2 -Ofast -feliminate-unused-debug-types -fno-prefetch-loop-arrays -fPIC >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=corei7 -g -g -O2 -O3 -feliminate-unused-debug-types -fPIC >>>>>>>>>>> GNU C17 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -ftree-vectorize -fno-dwarf2-cfi-asm -funwind-tables -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C++11 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -std=c++11 -fno-exceptions -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C++98 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -std=c++98 -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C17 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -fvisibility=hidden -ftree-vectorize -fno-dwarf2-cfi-asm -funwind-tables -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C++14 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -fvisibility=hidden -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C++14 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C17 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -O0 -ftree-vectorize -fno-dwarf2-cfi-asm -funwind-tables -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C17 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -fdefer-pop -fmerge-constants -fthread-jumps -fif-conversion -fif-conversion2 -fguess-branch-probability -fcprop-registers -foptimize-sibling-calls -fcse-follow-jumps -frerun-cse-after-loop -fgcse -fgcse-lm -fgcse-sm -fgcse-las -fdelete-null-pointer-checks -fexpensive-optimizations -fsched-interblock -fsched-spec -fcaller-saves -fpeephole2 -freorder-blocks -freorder-functions -funit-at-a-time -falign-functions -falign-jumps -falign-loops -falign-labels -fcrossjumping -finline-functions -ftree-vectorize -fno-dwarf2-cfi-asm -funwind-tables -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C11 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -std=gnu11 -ftree-vectorize -fno-dwarf2-cfi-asm -funwind-tables -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C++11 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -std=c++11 -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C++14 9.1.0 -P -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -g3 -O3 -std=c++14 -fpermissive -fPIC -ftls-model=initial-exec -flto -fno-fat-lto-objects -fno-strict-aliasing -fasynchronous-unwind-tables -fmessage-length=0 >>>>>>>>>>> GNU C++14 9.1.0 -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -O3 -std=c++14 -fPIC -flto -fno-fat-lto-objects -ftls-model=initial-exec -fvisibility=hidden >>>>>>>>>>> GNU C17 9.1.0 -m64 -march=tremont -mtune=tremont -mfpmath=sse -msse4.2 -ggdb3 -O3 -fPIC -flto -fno-fat-lto-objects -ftls-model=initial-exec -fvisibility=hidden >>>>>>>>>>> GNU C11 6.4.1 20180518 -mtune=generic -march=x86-64 -g -O2 -std=gnu11 -fgnu89-inline -feliminate-unused-debug-types -fmerge-all-constants -fno-stack-protector -frounding-math -fno-math-errno -fPIC -ftls-model=initial-exec >>>>>>>>>>> >>>>>>>>>>> On Wed, Oct 14, 2020 at 2:53 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>>>>>>>> >>>>>>>>>>>> Hi Dan >>>>>>>>>>>> >>>>>>>>>>>> Sorry, I put the command wrongly. >>>>>>>>>>>> I abbreviated ths steps, actually I'm using libfoo.optdebug, which is copied from original file, without flto option, same file, same build, addr2line has file and line. >>>>>>>>>>>> >>>>>>>>>>>> objcopy --only-keep-debug libfoo.so libfoo.optdebug >>>>>>>>>>>> >>>>>>>>>>>> x86_64-pc-linux-gnu-addr2line -e libfoo.optdebug 0x6a1e20 -f >>>>>>>>>>>> foo >>>>>>>>>>>> ??:? >>>>>>>>>>>> >>>>>>>>>>>> ./Jianyue >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On Wed, Oct 14, 2020 at 2:16 PM Dan Kegel <dank@xxxxxxxxx> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>> Did you want to run addr2line on libfoo.so instead of the default a.out? If so, you may need to add -e libfoo.so or the like. >>>>>>>>>>>>> >>>>>>>>>>>>> Jiany Wu via Gcc-help <gcc-help@xxxxxxxxxxx> schrieb am Di., 13. Okt. 2020, 22:53: >>>>>>>>>>>>>> >>>>>>>>>>>>>> BTW, I used gcc-ar, and only -flto is used for lto optimization, without >>>>>>>>>>>>>> -fuse-linker-plugin, I had tried to add it, but seems the same. >>>>>>>>>>>>>> >>>>>>>>>>>>>> On Wed, Oct 14, 2020 at 1:47 PM Jiany Wu <wujianyue000@xxxxxxxxx> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>> > Hi, >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Could you help give a hand about this issue? Or any suggestions? >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Can find function but can't find file and line. >>>>>>>>>>>>>> > Thanks indeed in advance. >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > $ readelf -a libfoo.so | grep foo >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > 9374: 0000000000783080 179 FUNC GLOBAL DEFAULT 12 foo >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > 30182: 0000000000783080 179 FUNC GLOBAL DEFAULT 12 foo >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > $ addr2line 0x783080 -f >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > foo >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > ??:? >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Gcc version: >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Target: x86_64-poky-linux >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Configured with: >>>>>>>>>>>>>> > ../../../../../../work-shared/gcc-9.1.0-r0/gcc-9.1.0/configure >>>>>>>>>>>>>> > --build=x86_64-linux --host=x86_64-pokysdk-linux --target=x86_64-poky-linux >>>>>>>>>>>>>> > --prefix=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr >>>>>>>>>>>>>> > --exec_prefix=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr >>>>>>>>>>>>>> > --bindir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux >>>>>>>>>>>>>> > --sbindir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux >>>>>>>>>>>>>> > --libexecdir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/libexec/x86_64-poky-linux >>>>>>>>>>>>>> > --datadir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/share >>>>>>>>>>>>>> > --sysconfdir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/etc >>>>>>>>>>>>>> > --sharedstatedir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/com >>>>>>>>>>>>>> > --localstatedir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/var >>>>>>>>>>>>>> > --libdir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/lib/x86_64-poky-linux >>>>>>>>>>>>>> > --includedir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/include >>>>>>>>>>>>>> > --oldincludedir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/include >>>>>>>>>>>>>> > --infodir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/share/info >>>>>>>>>>>>>> > --mandir=/opt/poky/2.1.1/sysroots/x86_64-pokysdk-linux/usr/share/man >>>>>>>>>>>>>> > --disable-silent-rules >>>>>>>>>>>>>> > --disable-dependency-tracking--enable-clocale=generic --with-gnu-ld >>>>>>>>>>>>>> > --enable-shared --enable-languages=c,c++ --enable-threads=posix >>>>>>>>>>>>>> > --enable-multilib --enable-c99 --enable-long-long --enable-symvers=gnu >>>>>>>>>>>>>> > --program-prefix=x86_64-poky-linux- --without-local-prefix --enable-lto >>>>>>>>>>>>>> > --disable-libssp --enable-libitm --disable-bootstrap --disable-libmudflap >>>>>>>>>>>>>> > --with-system-zlib --with-linker-hash-style=gnu --enable-linker-build-id >>>>>>>>>>>>>> > --with-ppl=no --with-cloog=no --enable-checking=release >>>>>>>>>>>>>> > --enable-cheaders=c_global --without-isl >>>>>>>>>>>>>> > --with-gxx-include-dir=/not/exist/usr/include/c++/9.1.0 >>>>>>>>>>>>>> > --with-sysroot=/not/exist --enable-poison-system-directories >>>>>>>>>>>>>> > --disable-static --with-glibc-version=2.28 --enable-__cxa_atexit >>>>>>>>>>>>>> > --disable-plugin --enable-fix-cortex-a53-835769 --enable-__cxa_atexit >>>>>>>>>>>>>> > --enable-libmudflap --enable-libgomp --disable-libstdcxx-pch >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Thread model: posix >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > gcc version 9.1.0 (GCC) >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Addr2line version: >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > GNU addr2line (GNU Binutils) 2.31.0.20180718 >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > Copyright (C) 2018 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) any later >>>>>>>>>>>>>> > version. >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > This program has absolutely no warranty. >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > ./Jianyue >>>>>>>>>>>>>> > >>>>>>>>>>>>>>
