Undefined symbols error when building system image on Julia 1.6.0-beta1

[tomyun]

It was originally posted to JuliaLang/PackageCompiler.jl#456, but I'm reposting here as it might be more relevant to Julia compiler itself.

When trying to build a system image containing Unitful 1.5.0 by using PackageCompiler 1.2.3 on the nightly version of Julia 1.6, I got several "Undefined symbols" errors looking for _jfptr_^_XXXXX. It works fine on Julia 1.5.3.

julia> using PackageCompiler

julia> using Unitful

julia> create_sysimage(:Unitful; sysimage_path="./unitful.so")
[ Info: PackageCompiler: creating system image object file, this might take a while...
Undefined symbols for architecture x86_64:
  "_jfptr_^_35271", referenced from:
      _tojlinvoke54351 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54313 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54297 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54296 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54295 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54294 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54293 in jl_KDXP0Q.o(text.o)
      ...
  "_jfptr_^_35340", referenced from:
      _tojlinvoke54348 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54310 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54292 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35394", referenced from:
      _tojlinvoke54346 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54319 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54309 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54291 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54290 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35427", referenced from:
      _tojlinvoke54354 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35467", referenced from:
      _tojlinvoke54345 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35496", referenced from:
      _tojlinvoke54343 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35546", referenced from:
      _tojlinvoke54355 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54330 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54329 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54328 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54327 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54326 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35584", referenced from:
      _tojlinvoke54352 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54336 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35649", referenced from:
      _tojlinvoke54350 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35689", referenced from:
      _tojlinvoke54353 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54298 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35749", referenced from:
      _tojlinvoke54356 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54305 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54304 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54303 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54302 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54301 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54300 in jl_KDXP0Q.o(text.o)
      ...
  "_jfptr_^_35789", referenced from:
      _tojlinvoke54344 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_35831", referenced from:
      _tojlinvoke54347 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54317 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54316 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54315 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54308 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54289 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_36179", referenced from:
      _tojlinvoke54349 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54334 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54325 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54324 in jl_KDXP0Q.o(text.o)
      _tojlinvoke54318 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_36216", referenced from:
      _tojlinvoke54342 in jl_KDXP0Q.o(text.o)
  "_jfptr_^_36245", referenced from:
      _tojlinvoke54341 in jl_KDXP0Q.o(text.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ERROR: failed process: Process(`gcc -m64 -march=x86-64 -shared -L/Applications/Julia-1.6.app/Contents/Resources/julia/lib -o ./unitful.so -Wl,-all_load /var/folders/1k/60gzj8497f54zr9n48bt37r80000gn/T/jl_KDXP0Q.o -ljulia`, ProcessExited(1)) [1]

Stacktrace:
 [1] pipeline_error
   @ ./process.jl:525 [inlined]
 [2] run(::Cmd; wait::Bool)
   @ Base ./process.jl:440
 [3] run
   @ ./process.jl:438 [inlined]
 [4] run_with_env
   @ ~/.julia/packages/PackageCompiler/AerNj/src/PackageCompiler.jl:93 [inlined]
 [5] create_sysimg_from_object_file(input_object::String, sysimage_path::String)
   @ PackageCompiler ~/.julia/packages/PackageCompiler/AerNj/src/PackageCompiler.jl:465
 [6] create_sysimage(packages::Symbol; sysimage_path::String, project::String, precompile_execution_file::Vector{String}, precompile_statements_file::Vector{String}, incremental::Bool, filter_stdlibs::Bool, replace_default::Bool, cpu_target::String, script::Nothing, base_sysimage::Nothing, isapp::Bool)
   @ PackageCompiler ~/.julia/packages/PackageCompiler/AerNj/src/PackageCompiler.jl:434
 [7] top-level scope
   @ REPL[4]:1

julia> versioninfo()
Julia Version 1.6.0-DEV.1558
Commit e24533d1d1 (2020-11-23 18:27 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin18.7.0)
  CPU: Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.0 (ORCJIT, skylake)

[Roger-luo]

I got similar error when running PackageCompiler tests

Undefined symbols for architecture x86_64:
  "_jl_RTLD_DEFAULT_handle", referenced from:
      _julia_typeinf_ext_toplevel_41459 in jl_6vaubk.o(text.o)
      _julia_typeinf_ext_toplevel_7418 in jl_6vaubk.o(text.o)
      _julia_verify_ir_41644 in jl_6vaubk.o(text.o)
      _julia_verify_ir_11049 in jl_6vaubk.o(text.o)
      _julia_coverage_enabled_12042 in jl_6vaubk.o(text.o)
      _julia_verify_linetable_12835 in jl_6vaubk.o(text.o)
      _julia_inbounds_option_9728 in jl_6vaubk.o(text.o)
      ...
     (maybe you meant: _jl_RTLD_DEFAULT_handle_pointer)
  "_jl_add_int", referenced from:
      _japi1_ssa_substitute_opNOT._9977 in jl_6vaubk.o(text.o)
      _julia_precise_container_type_41632 in jl_6vaubk.o(text.o)
      _julia_precise_container_type_10998 in jl_6vaubk.o(text.o)
  "_jl_apply_generic", referenced from:
      _jl_sysimg_fvars_base in jl_6vaubk.o(text.o)
      _julia_docm_38170 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_maybe_compress_codeinfo_10670 in jl_6vaubk.o(text.o)
      _julia__all_11936 in jl_6vaubk.o(text.o)
      _japi1_anymap_7472 in jl_6vaubk.o(text.o)
      _julia_abstract_call_41435 in jl_6vaubk.o(text.o)
      ...
  "_jl_bounds_error_int", referenced from:
      _japi1_YY.s73YY.169_20059 in jl_6vaubk.o(text.o)
      _julia_totaldays_51896 in jl_6vaubk.o(text.o)
      _japi1_Prompt_14040 in jl_6vaubk.o(text.o)
      _japi1_merge_types_36424 in jl_6vaubk.o(text.o)
      _julia_YY.manifestfile_pathYY.10_46553 in jl_6vaubk.o(text.o)
      _japi1_Downloader_13618 in jl_6vaubk.o(text.o)
  "_jl_bounds_error_ints", referenced from:
      _julia_abstract_call_builtin_11139 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11135 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _japi1_anymap_7472 in jl_6vaubk.o(text.o)
      _julia_abstract_call_41435 in jl_6vaubk.o(text.o)
      _julia_abstract_call_7390 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      ...
  "_jl_bounds_error_tuple_int", referenced from:
      _japi1_apply_type_tfunc_10420 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10407 in jl_6vaubk.o(text.o)
      _japi1_setdiff_8831 in jl_6vaubk.o(text.o)
      _japi1_string_26206 in jl_6vaubk.o(text.o)
      _japi1__nloops_18973 in jl_6vaubk.o(text.o)
      _japi1_println_38040 in jl_6vaubk.o(text.o)
      _japi1_vect_7685 in jl_6vaubk.o(text.o)
      ...
  "_jl_bounds_error_unboxed_int", referenced from:
      _julia_YY.1_46620 in jl_6vaubk.o(text.o)
      _julia__all_26603 in jl_6vaubk.o(text.o)
      _julia_axes_8664 in jl_6vaubk.o(text.o)
      _julia_axes_8666 in jl_6vaubk.o(text.o)
      _julia_axes_8662 in jl_6vaubk.o(text.o)
      _julia_indexed_iterate_7110 in jl_6vaubk.o(text.o)
      _julia_indexed_iterate_7062 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_char", referenced from:
      _julia_invalid_char_22527 in jl_6vaubk.o(text.o)
      _jfptr_read_26364 in jl_6vaubk.o(text.o)
      _japi1_unescape_string_19210 in jl_6vaubk.o(text.o)
      _japi1_unescape_string_19251 in jl_6vaubk.o(text.o)
      _julia_YY.parseYY.398_36197 in jl_6vaubk.o(text.o)
      _jfptr_char_move_left_43407 in jl_6vaubk.o(text.o)
      _julia_YY.with_output_colorYY.807_36657 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_float32", referenced from:
      _julia_isnan_11530 in jl_6vaubk.o(text.o)
      _julia_isnan_11532 in jl_6vaubk.o(text.o)
      _julia_issignleft_11522 in jl_6vaubk.o(text.o)
      _julia_issignleft_11526 in jl_6vaubk.o(text.o)
      _jfptr_Float32_13191 in jl_6vaubk.o(text.o)
      _jfptr_Float32_13183 in jl_6vaubk.o(text.o)
      _jfptr_Float32_13179 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_int16", referenced from:
      _julia__base_20609 in jl_6vaubk.o(text.o)
      _jfptr_read_26305 in jl_6vaubk.o(text.o)
      _julia_throw_inexacterror_12924 in jl_6vaubk.o(text.o)
      _julia_throw_inexacterror_12930 in jl_6vaubk.o(text.o)
      _julia_handle_deserialize_44127 in jl_6vaubk.o(text.o)
      _julia_throw_inexacterror_12894 in jl_6vaubk.o(text.o)
  "_jl_box_int32", referenced from:
      _jfptr_fetchYY.YY.kw_50316 in jl_6vaubk.o(text.o)
      _julia_getfield_nothrow_9828 in jl_6vaubk.o(text.o)
      _julia_sendfile_38861 in jl_6vaubk.o(text.o)
      _julia_open_38803 in jl_6vaubk.o(text.o)
      _jfptr_dsfmt_get_min_array_size_44035 in jl_6vaubk.o(text.o)
      _julia_verify_ir_41644 in jl_6vaubk.o(text.o)
      _julia_verify_ir_11049 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_int64", referenced from:
      _jfptr_lreplaceNOT._19060 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_maybe_compress_codeinfo_10670 in jl_6vaubk.o(text.o)
      _julia__all_11936 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_UnionSplitSignature_5620 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_ssavalue", referenced from:
      _jfptr_insert_nodeNOT._10592 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_late_inline_special_caseNOT._11407 in jl_6vaubk.o(text.o)
      _jfptr_YY.296_10718 in jl_6vaubk.o(text.o)
      _japi1_renumber_ssaNOT._12572 in jl_6vaubk.o(text.o)
      _julia_renumber_ssaNOT._12568 in jl_6vaubk.o(text.o)
      _jfptr_renumber_ssa_8195 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_uint16", referenced from:
      _julia_open_38803 in jl_6vaubk.o(text.o)
      _julia_open_38812 in jl_6vaubk.o(text.o)
      _jfptr_GT.GT._37844 in jl_6vaubk.o(text.o)
      _jfptr_read_26301 in jl_6vaubk.o(text.o)
      _julia_LT._37706 in jl_6vaubk.o(text.o)
      _julia_LT._37708 in jl_6vaubk.o(text.o)
      _julia_handle_deserialize_44127 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_uint32", referenced from:
      _jfptr_pow5invsplit_24868 in jl_6vaubk.o(text.o)
      _japi1_readheader_44103 in jl_6vaubk.o(text.o)
      _julia_YY.787_24706 in jl_6vaubk.o(text.o)
      _julia_load_version_44702 in jl_6vaubk.o(text.o)
      _jlcapi_cfunction_50573 in jl_6vaubk.o(text.o)
      _japi1_MUL._38109 in jl_6vaubk.o(text.o)
      _julia_wrap_string_23975 in jl_6vaubk.o(text.o)
      ...
  "_jl_box_uint64", referenced from:
      _jfptr_YY.160_11589 in jl_6vaubk.o(text.o)
      _japi1__reformat_bt_11890 in jl_6vaubk.o(text.o)
      _julia_compile_39676 in jl_6vaubk.o(text.o)
      _jfptr__unsafe_bitsetindexNOT._8722 in jl_6vaubk.o(text.o)
      _jfptr_TLD._10035 in jl_6vaubk.o(text.o)
      _jfptr_last_12668 in jl_6vaubk.o(text.o)
      _jfptr_first_9991 in jl_6vaubk.o(text.o)
      ...
  "_jl_boxed_int8_cache", referenced from:
      _julia_gen_build_code_45478 in jl_6vaubk.o(text.o)
      _julia__base_20597 in jl_6vaubk.o(text.o)
      _julia_julia_cmd_20549 in jl_6vaubk.o(text.o)
      _julia_throw_inexacterror_12918 in jl_6vaubk.o(text.o)
      _julia_handle_deserialize_44127 in jl_6vaubk.o(text.o)
      _julia_throw_inexacterror_12912 in jl_6vaubk.o(text.o)
      _julia_throw_inexacterror_12896 in jl_6vaubk.o(text.o)
      ...
  "_jl_boxed_uint8_cache", referenced from:
      _jfptr_TLD._10037 in jl_6vaubk.o(text.o)
      _jfptr_AND._8476 in jl_6vaubk.o(text.o)
      _jfptr_OR._8175 in jl_6vaubk.o(text.o)
      _jfptr_read_26309 in jl_6vaubk.o(text.o)
      _japi1_readheader_44103 in jl_6vaubk.o(text.o)
      _julia_event_callback_52111 in jl_6vaubk.o(text.o)
      _julia_read_until_end_15853 in jl_6vaubk.o(text.o)
      ...
  "_jl_checked_assignment", referenced from:
      _julia___init___43961 in jl_6vaubk.o(text.o)
      _julia_reinit_stdio_29588 in jl_6vaubk.o(text.o)
      _julia___init___51848 in jl_6vaubk.o(text.o)
      _julia_get_have_color_27036 in jl_6vaubk.o(text.o)
      _julia_promptf_47874 in jl_6vaubk.o(text.o)
      _julia_YY.867_22801 in jl_6vaubk.o(text.o)
      _julia___init_build_37661 in jl_6vaubk.o(text.o)
      ...
  "_jl_copy_ast", referenced from:
      _japi1__define_range_op_18590 in jl_6vaubk.o(text.o)
      _julia_testset_beginend_41076 in jl_6vaubk.o(text.o)
      _julia_parse_testset_args_41072 in jl_6vaubk.o(text.o)
      _japi1_tuplemerge_7878 in jl_6vaubk.o(text.o)
      _julia_snca_compress_worklistNOT._8457 in jl_6vaubk.o(text.o)
      _julia_lift_leaves_10047 in jl_6vaubk.o(text.o)
      _julia_recompute_type_7602 in jl_6vaubk.o(text.o)
      ...
  "_jl_current_exception", referenced from:
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _julia_print_response_42835 in jl_6vaubk.o(text.o)
      _julia_include_package_for_output_39783 in jl_6vaubk.o(text.o)
      _japi1__const_sizeof_7388 in jl_6vaubk.o(text.o)
      _julia_iterate_28363 in jl_6vaubk.o(text.o)
      _julia_YY.temp_cleanup_purgeYY.15_38850 in jl_6vaubk.o(text.o)
      _japi1_load_package_data_45356 in jl_6vaubk.o(text.o)
      ...
  "_jl_egal", referenced from:
      _julia_abstract_call_builtin_11135 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_41589 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_9806 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11150 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_41668 in jl_6vaubk.o(text.o)
      ...
  "_jl_enter_handler", referenced from:
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10420 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10404 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10407 in jl_6vaubk.o(text.o)
      _julia_print_response_42835 in jl_6vaubk.o(text.o)
      _japi1_print_29052 in jl_6vaubk.o(text.o)
      _julia_open_38803 in jl_6vaubk.o(text.o)
      ...
  "_jl_error", referenced from:
      _julia_print_response_42835 in jl_6vaubk.o(text.o)
      _julia_size_10252 in jl_6vaubk.o(text.o)
      _julia_size_10254 in jl_6vaubk.o(text.o)
      _julia_uv_write_20351 in jl_6vaubk.o(text.o)
      _julia_uv_write_20365 in jl_6vaubk.o(text.o)
      _japi1_flush_33368 in jl_6vaubk.o(text.o)
      _japi1_task_done_hook_19143 in jl_6vaubk.o(text.o)
      ...
  "_jl_excstack_state", referenced from:
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10420 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10404 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10407 in jl_6vaubk.o(text.o)
      _julia_print_response_42835 in jl_6vaubk.o(text.o)
      _japi1_print_29052 in jl_6vaubk.o(text.o)
      _julia_open_38803 in jl_6vaubk.o(text.o)
      ...
  "_jl_f__apply_iterate", referenced from:
      _julia_docm_38170 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_abstract_call_41435 in jl_6vaubk.o(text.o)
      _julia_abstract_call_7390 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia__switchtupleunion_9841 in jl_6vaubk.o(text.o)
      ...
  "_jl_f__apply_latest", referenced from:
      _japi1_include_37840 in jl_6vaubk.o(text.o)
      _julia_print_response_42835 in jl_6vaubk.o(text.o)
      _julia_do_respond_42929 in jl_6vaubk.o(text.o)
      _julia_YY.22_43821 in jl_6vaubk.o(text.o)
      _japi1_include_41141 in jl_6vaubk.o(text.o)
      _japi1_include_41082 in jl_6vaubk.o(text.o)
      _japi1_include_41140 in jl_6vaubk.o(text.o)
      ...
  "_jl_f__apply_pure", referenced from:
      _julia_pure_eval_call_12695 in jl_6vaubk.o(text.o)
  "_jl_f__expr", referenced from:
      _japi1__define_range_op_18590 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_testset_beginend_41076 in jl_6vaubk.o(text.o)
      _julia_parse_testset_args_41072 in jl_6vaubk.o(text.o)
      _julia_late_inline_special_caseNOT._11407 in jl_6vaubk.o(text.o)
      _japi1_lazy_iterpolate_8827 in jl_6vaubk.o(text.o)
      _julia_multidoc_38289 in jl_6vaubk.o(text.o)
      ...
  "_jl_f__typevar", referenced from:
      _japi1_apply_type_tfunc_10407 in jl_6vaubk.o(text.o)
      _julia_show_30026 in jl_6vaubk.o(text.o)
      _julia_show_30015 in jl_6vaubk.o(text.o)
      _julia_show_30003 in jl_6vaubk.o(text.o)
      _julia_show_29990 in jl_6vaubk.o(text.o)
      _japi1_show_29983 in jl_6vaubk.o(text.o)
      _japi1_TypeVar_5739 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_applicable", referenced from:
      _julia_complete_argument_47569 in jl_6vaubk.o(text.o)
      _julia_YY.9_52300 in jl_6vaubk.o(text.o)
      _julia_YY.read_tarballYY.46_16021 in jl_6vaubk.o(text.o)
      _japi1_display_31846 in jl_6vaubk.o(text.o)
  "_jl_f_apply_type", referenced from:
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _japi1_typeof_concrete_vararg_10495 in jl_6vaubk.o(text.o)
      _japi1_typeof_tfunc_8861 in jl_6vaubk.o(text.o)
      _japi1_tuplemerge_7878 in jl_6vaubk.o(text.o)
      _japi1_tuple_tail_elem_10957 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_arraysize", referenced from:
      _julia_showerror_16893 in jl_6vaubk.o(text.o)
  "_jl_f_fieldtype", referenced from:
      _julia_lift_leaves_10047 in jl_6vaubk.o(text.o)
      _julia_show_spec_linfo_37183 in jl_6vaubk.o(text.o)
      _japi1_isdefined_tfunc_7445 in jl_6vaubk.o(text.o)
      _julia_stmt_effect_free_10156 in jl_6vaubk.o(text.o)
      _julia_stmt_effect_free_10144 in jl_6vaubk.o(text.o)
      _julia_YY.252_12591 in jl_6vaubk.o(text.o)
      _japi1_YY.s73YY.169_20059 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_getfield", referenced from:
      _julia_docm_38170 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_abstract_call_41435 in jl_6vaubk.o(text.o)
      _julia_abstract_call_7390 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_41589 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_invoke", referenced from:
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _julia_YY.statusYY.139_44935 in jl_6vaubk.o(text.o)
      _julia_include_package_for_output_39783 in jl_6vaubk.o(text.o)
      _julia_setup_interface_43021 in jl_6vaubk.o(text.o)
      _julia_YY.temp_cleanup_purgeYY.15_38850 in jl_6vaubk.o(text.o)
      _julia_YY.40_32557 in jl_6vaubk.o(text.o)
      _japi1_load_package_data_45356 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_isa", referenced from:
      _julia_abstract_call_gf_by_type_41589 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_9806 in jl_6vaubk.o(text.o)
      _japi1_typeassert_type_instance_8869 in jl_6vaubk.o(text.o)
      _julia_YY.252_12591 in jl_6vaubk.o(text.o)
      _julia_show_type_name_33491 in jl_6vaubk.o(text.o)
      _julia_show_delim_array_16502 in jl_6vaubk.o(text.o)
      _japi1_add_headers_52145 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_isdefined", referenced from:
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_abstract_call_method_12803 in jl_6vaubk.o(text.o)
      _japi1_tuplemerge_7878 in jl_6vaubk.o(text.o)
      _julia_abstract_eval_cfunction_41566 in jl_6vaubk.o(text.o)
      _julia_abstract_eval_cfunction_8843 in jl_6vaubk.o(text.o)
      _julia_abstract_eval_value_7740 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_issubtype", referenced from:
      _julia_abstract_call_gf_by_type_41589 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_9806 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_41668 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11121 in jl_6vaubk.o(text.o)
      _japi1_tuplemerge_7878 in jl_6vaubk.o(text.o)
      _julia_limit_type_size_12704 in jl_6vaubk.o(text.o)
      _julia__limit_type_size_11397 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_setfield", referenced from:
      _julia_inline_applyNOT._7428 in jl_6vaubk.o(text.o)
      _japi1_setpropertyNOT._20777 in jl_6vaubk.o(text.o)
      _julia_setpropertyNOT._21724 in jl_6vaubk.o(text.o)
      _julia_setpropertyNOT._21726 in jl_6vaubk.o(text.o)
      _japi1_setpropertyNOT._20765 in jl_6vaubk.o(text.o)
      _japi1_setpropertyNOT._20771 in jl_6vaubk.o(text.o)
      _julia_setpropertyNOT._20773 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_sizeof", referenced from:
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_finish_11600 in jl_6vaubk.o(text.o)
      _julia_lift_leaves_10047 in jl_6vaubk.o(text.o)
      _julia_find_inferred_9853 in jl_6vaubk.o(text.o)
      _japi1__const_sizeof_7388 in jl_6vaubk.o(text.o)
      _japi1_sizeof_tfunc_7703 in jl_6vaubk.o(text.o)
      _julia_is_valid_type_for_apply_rewrite_8879 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_svec", referenced from:
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_abstract_call_method_12803 in jl_6vaubk.o(text.o)
      _japi1_include_37840 in jl_6vaubk.o(text.o)
      _julia_limit_type_size_12704 in jl_6vaubk.o(text.o)
      _julia_find_inferred_9853 in jl_6vaubk.o(text.o)
      _japi1_include_41141 in jl_6vaubk.o(text.o)
      _japi1_include_41082 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_tuple", referenced from:
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_abstract_call_method_12803 in jl_6vaubk.o(text.o)
      _japi1_typeof_concrete_vararg_10495 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10420 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10404 in jl_6vaubk.o(text.o)
      ...
  "_jl_f_typeassert", referenced from:
      _japi1_compile_29731 in jl_6vaubk.o(text.o)
  "_jl_gc_pool_alloc", referenced from:
      _julia_docm_38170 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11179 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11211 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11239 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11251 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11259 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11215 in jl_6vaubk.o(text.o)
      ...
  "_jl_gc_queue_root", referenced from:
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _japi1_anymap_7472 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_41589 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_9806 in jl_6vaubk.o(text.o)
      _julia__switchtupleunion_9841 in jl_6vaubk.o(text.o)
      ...
  "_jl_get_binding_or_error", referenced from:
      _japi1_copyNOT._9450 in jl_6vaubk.o(text.o)
      _japi1_YY.sortNOT.YY.8_41690 in jl_6vaubk.o(text.o)
      _japi1_YY.sortNOT.YY.8_11549 in jl_6vaubk.o(text.o)
      _julia_isnan_11530 in jl_6vaubk.o(text.o)
      _julia_isnan_11532 in jl_6vaubk.o(text.o)
      _julia_issignleft_11522 in jl_6vaubk.o(text.o)
      _julia_issignleft_11524 in jl_6vaubk.o(text.o)
      ...
  "_jl_get_nth_field_checked", referenced from:
      _japi1_getfield_tfunc_8084 in jl_6vaubk.o(text.o)
  "_jl_invoke", referenced from:
      _japi1_do_test_41068 in jl_6vaubk.o(text.o)
      _japi1_finish_41036 in jl_6vaubk.o(text.o)
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _japi1_read_manifest_47015 in jl_6vaubk.o(text.o)
      _julia_read_manifest_47009 in jl_6vaubk.o(text.o)
      _japi1_YY.77_42493 in jl_6vaubk.o(text.o)
      _julia_include_package_for_output_39783 in jl_6vaubk.o(text.o)
      ...
  "_jl_isa", referenced from:
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_41589 in jl_6vaubk.o(text.o)
      _julia_abstract_call_gf_by_type_9806 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11150 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_41668 in jl_6vaubk.o(text.o)
      ...
  "_jl_load_and_lookup", referenced from:
      _julia_typeinf_ext_toplevel_41459 in jl_6vaubk.o(text.o)
      _julia_typeinf_ext_toplevel_7418 in jl_6vaubk.o(text.o)
      _julia_verify_ir_41644 in jl_6vaubk.o(text.o)
      _julia_verify_ir_11049 in jl_6vaubk.o(text.o)
      _julia_coverage_enabled_12042 in jl_6vaubk.o(text.o)
      _julia_verify_linetable_12835 in jl_6vaubk.o(text.o)
      _julia_inbounds_option_9728 in jl_6vaubk.o(text.o)
      ...
  "_jl_new_structv", referenced from:
      _japi1_display_31845 in jl_6vaubk.o(text.o)
      _julia_history_move_42672 in jl_6vaubk.o(text.o)
      _japi1_match_input_43524 in jl_6vaubk.o(text.o)
      _julia_YY.downloadYY.12_47172 in jl_6vaubk.o(text.o)
      _julia_YY.downloadYY.12_47163 in jl_6vaubk.o(text.o)
      _julia__shrink_32895 in jl_6vaubk.o(text.o)
      _julia_enter_prefix_search_43410 in jl_6vaubk.o(text.o)
      ...
  "_jl_object_id_", referenced from:
      _julia_ht_keyindex_35972 in jl_6vaubk.o(text.o)
      _julia_ht_keyindex_35875 in jl_6vaubk.o(text.o)
      _julia_ht_keyindex_35914 in jl_6vaubk.o(text.o)
      _julia_ht_keyindex_35910 in jl_6vaubk.o(text.o)
      _julia_ht_keyindex_35908 in jl_6vaubk.o(text.o)
      _julia_ht_keyindex_35900 in jl_6vaubk.o(text.o)
      _julia_ht_keyindex_35946 in jl_6vaubk.o(text.o)
      ...
  "_jl_pop_handler", referenced from:
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10420 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10404 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10407 in jl_6vaubk.o(text.o)
      _julia_print_response_42835 in jl_6vaubk.o(text.o)
      _japi1_print_29052 in jl_6vaubk.o(text.o)
      _julia_open_38803 in jl_6vaubk.o(text.o)
      ...
  "_jl_restore_excstack", referenced from:
      _julia_YY.789_32181 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10420 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10404 in jl_6vaubk.o(text.o)
      _japi1_apply_type_tfunc_10407 in jl_6vaubk.o(text.o)
      _julia_print_response_42835 in jl_6vaubk.o(text.o)
      _julia_include_package_for_output_39783 in jl_6vaubk.o(text.o)
      _japi1__const_sizeof_7388 in jl_6vaubk.o(text.o)
      ...
  "_jl_subtype", referenced from:
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      _julia_abstract_eval_cfunction_41566 in jl_6vaubk.o(text.o)
      _julia_abstract_eval_cfunction_8843 in jl_6vaubk.o(text.o)
      _julia_abstract_eval_value_7740 in jl_6vaubk.o(text.o)
      _julia_late_inline_special_caseNOT._11407 in jl_6vaubk.o(text.o)
      ...
  "_jl_throw", referenced from:
      _julia_docm_38170 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11139 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11135 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _japi1_anymap_7472 in jl_6vaubk.o(text.o)
      _julia_abstract_call_41435 in jl_6vaubk.o(text.o)
      _julia_abstract_call_7390 in jl_6vaubk.o(text.o)
      ...
  "_jl_type_error", referenced from:
      _julia_docm_38170 in jl_6vaubk.o(text.o)
      _julia_abstract_call_builtin_11139 in jl_6vaubk.o(text.o)
      _julia_rewrite_apply_exprargsNOT._9166 in jl_6vaubk.o(text.o)
      _julia_cache_resultNOT._11117 in jl_6vaubk.o(text.o)
      _julia__all_11936 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_41504 in jl_6vaubk.o(text.o)
      _julia_abstract_call_known_7750 in jl_6vaubk.o(text.o)
      ...
  "_jl_typeassert", referenced from:
      _japi1__deepcopy_array_t_40090 in jl_6vaubk.o(text.o)
      _julia_typeinfo_prefix_39020 in jl_6vaubk.o(text.o)
      _julia_typeinfo_prefix_39018 in jl_6vaubk.o(text.o)
      _julia_typeinfo_prefix_39015 in jl_6vaubk.o(text.o)
      _julia__builtin_nothrow_11774 in jl_6vaubk.o(text.o)
  "_jl_undefined_var_error", referenced from:
      _japi1_copyNOT._9450 in jl_6vaubk.o(text.o)
      _japi1_YY.sortNOT.YY.8_41690 in jl_6vaubk.o(text.o)
      _japi1_YY.sortNOT.YY.8_11549 in jl_6vaubk.o(text.o)
      _julia_isnan_11530 in jl_6vaubk.o(text.o)
      _julia_isnan_11532 in jl_6vaubk.o(text.o)
      _julia_issignleft_11522 in jl_6vaubk.o(text.o)
      _julia_issignleft_11524 in jl_6vaubk.o(text.o)
      ...
  "_jl_world_counter", referenced from:
      _jlcapi_timer_callback_52176 in jl_6vaubk.o(text.o)
      _jlcapi_socket_callback_52180 in jl_6vaubk.o(text.o)
      _jlcapi_timeout_callback_52154 in jl_6vaubk.o(text.o)
      _jlcapi_event_callback_52163 in jl_6vaubk.o(text.o)
      _jlcapi_uv_timercb_40424 in jl_6vaubk.o(text.o)
      _jlcapi_cfunction_44383 in jl_6vaubk.o(text.o)
      _jlcapi_cfunction_44420 in jl_6vaubk.o(text.o)
      ...
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
PackageCompiler.jl: Error During Test at /Users/roger/.julia/packages/PackageCompiler/AerNj/test/runtests.jl:21
  Got exception outside of a @test
  failed process: Process(`gcc -m64 -march=x86-64 -shared -L/Users/roger/.ion/packages/Julia-1.6.app/Contents/Resources/julia/lib -o /var/folders/bn/z7nxwwgj6mg41t_rtyc0f5h00000gn/T/jl_UBpK0A/sys.dylib -Wl,-all_load /var/folders/bn/z7nxwwgj6mg41t_rtyc0f5h00000gn/T/jl_6vaubk.o -ljulia`, ProcessExited(1)) [1]

  Stacktrace:
    [1] pipeline_error
      @ ./process.jl:525 [inlined]
    [2] run(::Cmd; wait::Bool)
      @ Base ./process.jl:440
    [3] run
      @ ./process.jl:438 [inlined]
    [4] run_with_env
      @ ~/.julia/packages/PackageCompiler/AerNj/src/PackageCompiler.jl:93 [inlined]
    [5] create_sysimg_from_object_file(input_object::String, sysimage_path::String)
      @ PackageCompiler ~/.julia/packages/PackageCompiler/AerNj/src/PackageCompiler.jl:465
    [6] create_sysimage(packages::Symbol; sysimage_path::String, project::String, precompile_execution_file::String, precompile_statements_file::Vector{String}, incremental::Bool, filter_stdlibs::Bool, replace_default::Bool, cpu_target::String, script::String, base_sysimage::Nothing, isapp::Bool)
      @ PackageCompiler ~/.julia/packages/PackageCompiler/AerNj/src/PackageCompiler.jl:434
    [7] macro expansion
      @ ~/.julia/packages/PackageCompiler/AerNj/test/runtests.jl:34 [inlined]
    [8] macro expansion
      @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1147 [inlined]
    [9] top-level scope
      @ ~/.julia/packages/PackageCompiler/AerNj/test/runtests.jl:22
   [10] include(fname::String)
      @ Base.MainInclude ./client.jl:444
   [11] top-level scope
      @ none:6
   [12] eval(m::Module, e::Any)
      @ Core ./boot.jl:360
   [13] exec_options(opts::Base.JLOptions)
      @ Base ./client.jl:261
   [14] _start()
      @ Base ./client.jl:485

[tomyun]

The issue reported by @Roger-luo sounds like JuliaLang/PackageCompiler.jl#471 which seems to have been resolved since then.

In the meantime, my original issue with missing ^ symbols for Unitful still exists on the latest Julia 1.7.0-DEV.239 and Julia 1.6.0-beta1 released today. I'm on macOS and not sure if other platforms have the same issue.

FYI, ASM output indicates that _tojlinvoke... which looks for _jsysw_^_... are most exclusively referred by _j_POW... symbols.

julia> create_sysimage(:Unitful; sysimage_path="./unitful.so")
[ Info: PackageCompiler: creating system image object file, this might take a while...
Undefined symbols for architecture x86_64:
  "_jsysw_^_173", referenced from:
      _tojlinvoke56065 in jl_mKdFP3.o(text.o)
      _tojlinvoke56035 in jl_mKdFP3.o(text.o)
      _tojlinvoke56034 in jl_mKdFP3.o(text.o)
      _tojlinvoke56033 in jl_mKdFP3.o(text.o)
      _tojlinvoke56026 in jl_mKdFP3.o(text.o)
      _tojlinvoke56007 in jl_mKdFP3.o(text.o)
  "_jsysw_^_174", referenced from:
      _tojlinvoke56064 in jl_mKdFP3.o(text.o)
      _tojlinvoke56037 in jl_mKdFP3.o(text.o)
      _tojlinvoke56027 in jl_mKdFP3.o(text.o)
      _tojlinvoke56009 in jl_mKdFP3.o(text.o)
      _tojlinvoke56008 in jl_mKdFP3.o(text.o)
  "_jsysw_^_175", referenced from:
      _tojlinvoke56066 in jl_mKdFP3.o(text.o)
      _tojlinvoke56028 in jl_mKdFP3.o(text.o)
      _tojlinvoke56010 in jl_mKdFP3.o(text.o)
  "_jsysw_^_176", referenced from:
      _tojlinvoke56069 in jl_mKdFP3.o(text.o)
      _tojlinvoke56031 in jl_mKdFP3.o(text.o)
      _tojlinvoke56015 in jl_mKdFP3.o(text.o)
      _tojlinvoke56014 in jl_mKdFP3.o(text.o)
      _tojlinvoke56013 in jl_mKdFP3.o(text.o)
      _tojlinvoke56012 in jl_mKdFP3.o(text.o)
      _tojlinvoke56011 in jl_mKdFP3.o(text.o)
      ...
  "_jsysw_^_177", referenced from:
      _tojlinvoke56071 in jl_mKdFP3.o(text.o)
      _tojlinvoke56016 in jl_mKdFP3.o(text.o)
  "_jsysw_^_178", referenced from:
      _tojlinvoke56074 in jl_mKdFP3.o(text.o)
      _tojlinvoke56023 in jl_mKdFP3.o(text.o)
      _tojlinvoke56022 in jl_mKdFP3.o(text.o)
      _tojlinvoke56021 in jl_mKdFP3.o(text.o)
      _tojlinvoke56020 in jl_mKdFP3.o(text.o)
      _tojlinvoke56019 in jl_mKdFP3.o(text.o)
      _tojlinvoke56018 in jl_mKdFP3.o(text.o)
      ...
  "_jsysw_^_179", referenced from:
      _tojlinvoke56067 in jl_mKdFP3.o(text.o)
      _tojlinvoke56052 in jl_mKdFP3.o(text.o)
      _tojlinvoke56043 in jl_mKdFP3.o(text.o)
      _tojlinvoke56042 in jl_mKdFP3.o(text.o)
      _tojlinvoke56036 in jl_mKdFP3.o(text.o)
  "_jsysw_^_180", referenced from:
      _tojlinvoke56073 in jl_mKdFP3.o(text.o)
      _tojlinvoke56048 in jl_mKdFP3.o(text.o)
      _tojlinvoke56047 in jl_mKdFP3.o(text.o)
      _tojlinvoke56046 in jl_mKdFP3.o(text.o)
      _tojlinvoke56045 in jl_mKdFP3.o(text.o)
      _tojlinvoke56044 in jl_mKdFP3.o(text.o)
  "_jsysw_^_181", referenced from:
      _tojlinvoke56070 in jl_mKdFP3.o(text.o)
      _tojlinvoke56054 in jl_mKdFP3.o(text.o)
  "_jsysw_^_182", referenced from:
      _tojlinvoke56059 in jl_mKdFP3.o(text.o)
  "_jsysw_^_183", referenced from:
      _tojlinvoke56060 in jl_mKdFP3.o(text.o)
  "_jsysw_^_184", referenced from:
      _tojlinvoke56061 in jl_mKdFP3.o(text.o)
  "_jsysw_^_185", referenced from:
      _tojlinvoke56062 in jl_mKdFP3.o(text.o)
  "_jsysw_^_186", referenced from:
      _tojlinvoke56063 in jl_mKdFP3.o(text.o)
  "_jsysw_^_187", referenced from:
      _tojlinvoke56068 in jl_mKdFP3.o(text.o)
  "_jsysw_^_188", referenced from:
      _tojlinvoke56072 in jl_mKdFP3.o(text.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ERROR: failed process: Process(`gcc -m64 -march=x86-64 -shared -L/Applications/Julia-1.6.app/Contents/Resources/julia/lib -L/Applications/Julia-1.6.app/Contents/Resources/julia/lib/julia -o ./unitful.so -Wl,-all_load /var/folders/1k/60gzj8497f54zr9n48bt37r80000gn/T/jl_mKdFP3.o -ljulia-internal -ljulia`, ProcessExited(1)) [1]

Stacktrace:
 [1] pipeline_error
   @ ./process.jl:525 [inlined]
 [2] run(::Cmd; wait::Bool)
   @ Base ./process.jl:440
 [3] run
   @ ./process.jl:438 [inlined]
 [4] run_with_env
   @ ~/.julia/packages/PackageCompiler/KeZOk/src/PackageCompiler.jl:101 [inlined]
 [5] create_sysimg_from_object_file(input_object::String, sysimage_path::String)
   @ PackageCompiler ~/.julia/packages/PackageCompiler/KeZOk/src/PackageCompiler.jl:497
 [6] create_sysimage(packages::Symbol; sysimage_path::String, project::String, precompile_execution_file::Vector{String}, precompile_statements_file::Vector{String}, incremental::Bool, filter_stdlibs::Bool, replace_default::Bool, cpu_target::String, script::Nothing, base_sysimage::Nothing, isapp::Bool)
   @ PackageCompiler ~/.julia/packages/PackageCompiler/KeZOk/src/PackageCompiler.jl:451
 [7] top-level scope
   @ REPL[11]:1

[tomyun]

Testing on the recently released julia:1.6.0-beta1 docker image (with apt install build-essential to get gcc) shows that the issue doesn't happen on Linux. Perhaps this issue is specific to macOS then.

Interestingly, jsysw_^_... symbols were still undefined there, but didn't raise an error during link (create_sysimage).

# nm unitful.so | grep "jsysw"
                 U jsysw_^_170
                 U jsysw_^_171
                 U jsysw_^_172
                 U jsysw_^_173
                 U jsysw_^_174
                 U jsysw_^_175
                 U jsysw_^_176
                 U jsysw_^_177
                 U jsysw_^_178
                 U jsysw_^_179
                 U jsysw_^_180
                 U jsysw_^_181
                 U jsysw_^_182
                 U jsysw_^_183
                 U jsysw_^_184
                 U jsysw_^_185

[alhirzel]

I see an error with jsysw_^_* on Arch Linux, Julia 1.6.0beta1, when precompiling a sysimage for every-day use. I think it has to do with one of the packages that I am compiling. I can narrow this down if desired.

[alhirzel]

For what it's worth, MNWE is the Unitful package:

#!/bin/sh
# run from within a newly unpacked Julia 1.6.0beta1
JULIA_BINDIR=bin bin/julia -e 'using Pkg; Pkg.add("PackageCompiler")'
JULIA_BINDIR=bin bin/julia -e 'using Pkg; Pkg.add("Unitful")'
JULIA_BINDIR=bin bin/julia -e 'using PackageCompiler; create_sysimage([:Unitful], sysimage_path="sysimage.so")'
JULIA_BINDIR=bin bin/julia --sysimage sysimage.so

ERROR: could not load library "xxx/julia-1.6.0-beta1/sysimage.so"
xxx/julia-1.6.0-beta1/sysimage.so: undefined symbol: jsysw_^_169

[KristofferC]

The first line in Unitful where the error happens (if you comment out everything below the line above it, it works fine) is:

https://github.com/PainterQubits/Unitful.jl/blob/3449a5b34f755cb02b1894fe33c4d366296d51af/src/pkgdefaults.jl#L77

I don't really understand it though... Other @unit calls are performed a few lines above.

[alhirzel]

I just want to put it out there, that's some deep magic.