The same thing happens to me when I'm trying to rebuild Linux 5.7 kernel
on debian testing.


gcc -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wall 
-Wdate-time -D_FORTIFY_SOURCE=2 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/perf 
-I/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf 
-isystem /home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/include 
-Wbad-function-cast -Wdeclaration-after-statement -Wformat-security 
-Wformat-y2k -Winit-self -Wmissing-declarations -Wmissing-prototypes 
-Wnested-externs -Wno-system-headers -Wold-style-definition -Wpacked 
-Wredundant-decls -Wstrict-prototypes -Wswitch-default -Wswitch-enum -Wundef 
-Wwrite-strings -Wformat -Wstrict-aliasing=3 -Wshadow 
-DHAVE_ARCH_X86_64_SUPPORT 
-I/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/arch/x86/include/generated
 -DHAVE_SYSCALL_TABLE_SUPPORT -DHAVE_PERF_REGS_SUPPORT 
-DHAVE_ARCH_REGS_QUERY_REGISTER_OFFSET -O6 -fno-omit-frame-pointer -ggdb3 
-funwind-tables -Wall -Wextra -std=gnu99 -fstack-protector-all 
-D_FORTIFY_SOURCE=2 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/lib/perf/include 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/perf/util/include 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/perf/arch/x86/include 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/include/ 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/arch/x86/include/uapi 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/include/uapi 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/arch/x86/include/ 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/arch/x86/ 
-I/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf//util
 -I/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/ 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/perf/util 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/perf 
-I/home/zanyrain/r7000-dev/linux-5.7.6/tools/lib/ 
-DHAVE_SYNC_COMPARE_AND_SWAP_SUPPORT -DHAVE_PTHREAD_ATTR_SETAFFINITY_NP 
-DHAVE_PTHREAD_BARRIER -DHAVE_EVENTFD -DHAVE_GET_CURRENT_DIR_NAME -DHAVE_GETTID 
-DHAVE_FILE_HANDLE -DHAVE_DWARF_GETLOCATIONS_SUPPORT -DHAVE_GLIBC_SUPPORT 
-DHAVE_AIO_SUPPORT -DHAVE_SCHED_GETCPU_SUPPORT -DHAVE_SETNS_SUPPORT 
-DHAVE_CSTRACE_SUPPORT  -DHAVE_LIBELF_SUPPORT -DHAVE_LIBELF_MMAP_SUPPORT 
-DHAVE_ELF_GETPHDRNUM_SUPPORT -DHAVE_GELF_GETNOTE_SUPPORT 
-DHAVE_ELF_GETSHDRSTRNDX_SUPPORT -DHAVE_DWARF_SUPPORT  -DHAVE_LIBBPF_SUPPORT 
-DHAVE_BPF_PROLOGUE -DHAVE_JITDUMP -DHAVE_DWARF_UNWIND_SUPPORT 
-DNO_LIBUNWIND_DEBUG_FRAME -DHAVE_LIBUNWIND_SUPPORT  -DHAVE_SLANG_SUPPORT 
-DHAVE_LIBPERL_SUPPORT -DHAVE_TIMERFD_SUPPORT -DHAVE_LIBPYTHON_SUPPORT 
-DHAVE_CPLUS_DEMANGLE_SUPPORT -DHAVE_ZLIB_SUPPORT -DHAVE_LZMA_SUPPORT 
-DHAVE_LIBCAP_SUPPORT -DHAVE_BACKTRACE_SUPPORT -DHAVE_LIBNUMA_SUPPORT 
-DHAVE_KVM_STAT_SUPPORT -DHAVE_PERF_READ_VDSO32 -DHAVE_PERF_READ_VDSOX32 
-DHAVE_LIBBABELTRACE_SUPPORT  -DHAVE_AUXTRACE_SUPPORT 
-I/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/ 
-Wl,-z,relro -Xlinker 
--dynamic-list=/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/plugins/libtraceevent-dynamic-list
 \
        
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/perf-in.o
 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/pmu-events/pmu-events-in.o
 -Wl,--whole-archive 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/libapi.a
 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/libtraceevent.a
 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/libsubcmd.a
 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/libperf.a
 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/libbpf.a
  -Wl,--no-whole-archive -Wl,--start-group -lpthread -lrt -lm -ldl 
-lopencsd_c_api -lopencsd -lelf -ldw -lunwind-x86_64 -lunwind -llzma -lslang 
-lperl -ldl -lm -lpthread -lc -lcrypt -lpython3.8 -lcrypt -lpthread -ldl -lutil 
-lm -lm -lutil -liberty -lz -llzma -lcap -lnuma -lbabeltrace-ctf 
-Wl,--end-group -o 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/perf
/usr/bin/ld:/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/plugins/libtraceevent-dynamic-list:2:
 ignoring invalid character `@' in script
/usr/bin/ld:/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/plugins/libtraceevent-dynamic-list:2:
 ignoring invalid character `@' in script
/usr/bin/ld:/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/plugins/libtraceevent-dynamic-list:2:
 syntax error in dynamic list
collect2: error: ld returned 1 exit status
make[5]: *** [Makefile.perf:629: 
/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf/perf] 
Error 1
make[5]: Leaving directory '/home/zanyrain/r7000-dev/linux-5.7.6/tools/perf'
make[4]: *** [Makefile.perf:225: sub-make] Error 2
make[4]: Leaving directory '/home/zanyrain/r7000-dev/linux-5.7.6/tools/perf'
make[3]: *** 
[/home/zanyrain/r7000-dev/linux-5.7.6/debian/rules.d/tools/perf/Makefile:41: 
all] Error 2
make[3]: Leaving directory 
'/home/zanyrain/r7000-dev/linux-5.7.6/debian/build/build-tools/tools/perf'
make[2]: *** [debian/rules.real:692: build-perf] Error 2
make[2]: Leaving directory '/home/zanyrain/r7000-dev/linux-5.7.6'
make[1]: *** [debian/rules.gen:417: build-arch_amd64_real] Error 2
make[1]: Leaving directory '/home/zanyrain/r7000-dev/linux-5.7.6'
make: *** [debian/rules:33: build-arch] Error 2

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https://bugs.launchpad.net/bugs/1887397

Title:
  perf build broken after updating to bintuils 2.34.90.20200706-1ubuntu1

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Groovy:
  Incomplete

Bug description:
  After updating to binutils 2.34.90.20200706-1ubuntu1 Linux' perf build
  is failing with the following error:

  
/usr/bin/ld:/tmp/autopkgtest.440kEd/build.N7g/src/debian/build/tools-perarch/tools/lib/traceevent/plugins/libtraceevent-dynamic-list:2:
 ignoring invalid character `@' in script
  
/usr/bin/ld:/tmp/autopkgtest.440kEd/build.N7g/src/debian/build/tools-perarch/tools/lib/traceevent/plugins/libtraceevent-dynamic-list:2:
 ignoring invalid character `@' in script
  
/usr/bin/ld:/tmp/autopkgtest.440kEd/build.N7g/src/debian/build/tools-perarch/tools/lib/traceevent/plugins/libtraceevent-dynamic-list:2:
 syntax error in dynamic list
  collect2: error: ld returned 1 exit status

  The file mentioned in the error (libtraceevent-dynamic-list) contains
  some '@' that ld doesn't seem to like:

  $ cat lib/traceevent/plugins/libtraceevent-dynamic-list
  {
          __stack_chk_fail@@GLIBC_2.4;
          free@@GLIBC_2.2.5;
          memset@@GLIBC_2.2.5;
          realloc@@GLIBC_2.2.5;
          sprintf@@GLIBC_2.2.5;
          strcmp@@GLIBC_2.2.5;
          strdup@@GLIBC_2.2.5;
          strncmp@@GLIBC_2.2.5;
          tep_find_any_field;
          tep_find_field;
          tep_find_function;
          tep_find_function_address;
          tep_get_field_raw;
          tep_get_field_val;
          tep_is_file_bigendian;
          tep_is_local_bigendian;
          tep_plugin_add_options;
          tep_plugin_remove_options;
          tep_print_func_field;
          tep_print_num_field;
          tep_read_number_field;
          tep_register_comm;
          tep_register_event_handler;
          tep_register_print_function;
          tep_unregister_event_handler;
          tep_unregister_print_function;
          trace_seq_printf;
          trace_seq_putc;
          trace_seq_puts;
          trace_seq_terminate;
          warning;
  };

  The same file generated in a Focal environment (w/ binutils
  2.34-6ubuntu1) looks as following:

  $ cat lib/traceevent/plugins/libtraceevent-dynamic-list
  {
          __stack_chk_fail;
          free;
          memset;
          realloc;
          sprintf;
          strcmp;
          strdup;
          strncmp;
          tep_find_any_field;
          tep_find_field;
          tep_find_function;
          tep_find_function_address;
          tep_get_field_raw;
          tep_get_field_val;
          tep_is_file_bigendian;
          tep_is_local_bigendian;
          tep_plugin_add_options;
          tep_plugin_remove_options;
          tep_print_func_field;
          tep_print_num_field;
          tep_read_number_field;
          tep_register_comm;
          tep_register_event_handler;
          tep_register_print_function;
          tep_unregister_event_handler;
          tep_unregister_print_function;
          trace_seq_printf;
          trace_seq_putc;
          trace_seq_puts;
          trace_seq_terminate;
          warning;
  };

  And here is the chunk of Makefile that is generating this file:

  define do_generate_dynamic_list_file
          symbol_type=`$(NM) -u -D $1 | awk 'NF>1 {print $$1}' | \
          xargs echo "U w W" | tr 'w ' 'W\n' | sort -u | xargs echo`;\
          if [ "$$symbol_type" = "U W" ];then                             \
                  (echo '{';                                              \
                  $(NM) -u -D $1 | awk 'NF>1 {print "\t"$$2";"}' | sort -u;\
                  echo '};';                                              \
                  ) > $2;                                                 \
          else                                                            \
                  (echo Either missing one of [$1] or bad version of $(NM)) 
1>&2;\
                  fi

  My guess is that something changed in the output of `nm` to show the @
  charaters that ld does not like.

  This problem is currently breaking all kernel builds in Groovy.

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