Failure to build iso_varying_string

[everythingfunctional]

I wanted to see how well the Fortran version was doing (I haven't really used it at all yet). I tried building my iso_varying_string package and got the following error.

 + gfortran  build/gfortran_debug/test/unit_test_main.f90.o build/gfortran_debug/test/unit_test_adjustl_test.f90.o build/gfortran_debug/test/unit_test_adjustr_test.f90.o build/gfortran_debug/test/unit_test_assignment_test.f90.o build/gfortran_debug/test/unit_test_char_test.f90.o build/gfortran_debug/test/unit_test_concat_test.f90.o build/gfortran_debug/test/unit_test_equal_test.f90.o build/gfortran_debug/test/unit_test_extract_test.f90.o build/gfortran_debug/test/unit_test_greater_than_equal_test.f90.o build/gfortran_debug/test/unit_test_greater_than_test.f90.o build/gfortran_debug/test/unit_test_iachar_test.f90.o build/gfortran_debug/test/unit_test_ichar_test.f90.o build/gfortran_debug/test/unit_test_index_test.f90.o build/gfortran_debug/test/unit_test_insert_test.f90.o build/gfortran_debug/test/unit_test_len_test.f90.o build/gfortran_debug/test/unit_test_len_trim_test.f90.o build/gfortran_debug/test/unit_test_less_than_equal_test.f90.o build/gfortran_debug/test/unit_test_less_than_test.f90.o build/gfortran_debug/test/unit_test_lge_test.f90.o build/gfortran_debug/test/unit_test_lgt_test.f90.o build/gfortran_debug/test/unit_test_lle_test.f90.o build/gfortran_debug/test/unit_test_llt_test.f90.o build/gfortran_debug/test/unit_test_not_equal_test.f90.o build/gfortran_debug/test/unit_test_remove_test.f90.o build/gfortran_debug/test/unit_test_repeat_test.f90.o build/gfortran_debug/test/unit_test_replace_range_test.f90.o build/gfortran_debug/test/unit_test_replace_start_test.f90.o build/gfortran_debug/test/unit_test_replace_target_test.f90.o build/gfortran_debug/test/unit_test_scan_test.f90.o build/gfortran_debug/test/unit_test_split_character_set_test.f90.o build/gfortran_debug/test/unit_test_split_string_set_test.f90.o build/gfortran_debug/test/unit_test_trim_test.f90.o build/gfortran_debug/test/unit_test_var_str_test.f90.o build/gfortran_debug/test/unit_test_verify_test.f90.o -Wall -Wextra -Wimplicit-interface  -fPIC -fmax-errors=1 -g -fbounds-check -fcheck-array-temporaries -fbacktrace -Jbuild/gfortran_debug/iso_varying_string build/gfortran_debug/iso_varying_string/libiso_varying_string.a  -o build/gfortran_debug/test/unit_test
Undefined symbols for architecture x86_64:
  "___custom_generator_MOD___vtab_3126CD9", referenced from:
      ___repeat_test_MOD_test_repeat in unit_test_repeat_test.f90.o
  "___custom_generator_MOD___vtab_custom_generator_Ascii_character_generator_t", referenced from:
      ___iachar_test_MOD_test_iachar in unit_test_iachar_test.f90.o
      ___ichar_test_MOD_test_ichar in unit_test_ichar_test.f90.o
  "___custom_generator_MOD___vtab_custom_generator_Ascii_string_pair_generator_t", referenced from:
      ___concat_test_MOD_test_concat in unit_test_concat_test.f90.o
      ___equal_test_MOD_test_equals in unit_test_equal_test.f90.o
      ___greater_than_equal_test_MOD_test_greater_than_equals in unit_test_greater_than_equal_test.f90.o
      ___greater_than_test_MOD_test_greater_than in unit_test_greater_than_test.f90.o
      ___index_test_MOD_test_index in unit_test_index_test.f90.o
      ___less_than_equal_test_MOD_test_less_than_equals in unit_test_less_than_equal_test.f90.o
      ___less_than_test_MOD_test_less_than in unit_test_less_than_test.f90.o
      ...
  "___custom_generator_MOD___vtab_custom_generator_Character_input_t", referenced from:
      ___iachar_test_MOD_check_iachar in unit_test_iachar_test.f90.o
      ___ichar_test_MOD_check_ichar in unit_test_ichar_test.f90.o
  "___custom_generator_MOD___vtab_custom_generator_String_and_integer_input_t", referenced from:
      ___repeat_test_MOD_check_repeat in unit_test_repeat_test.f90.o
  "___custom_generator_MOD___vtab_custom_generator_String_pair_input_t", referenced from:
      ___concat_test_MOD_check_concat_character_and_string in unit_test_concat_test.f90.o
      ___concat_test_MOD_check_concat_string_and_character in unit_test_concat_test.f90.o
      ___concat_test_MOD_check_concat_strings in unit_test_concat_test.f90.o
      ___equal_test_MOD_check_string_equal_character in unit_test_equal_test.f90.o
      ___equal_test_MOD_check_character_equal_string in unit_test_equal_test.f90.o
      ___equal_test_MOD_check_string_equal_string in unit_test_equal_test.f90.o
      ___greater_than_equal_test_MOD_check_string_greater_than_equal_character in unit_test_greater_than_equal_test.f90.o
      ...
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
 Command failed
ERROR STOP 

Error termination. Backtrace:
#0  0x106e70ebd
#1  0x106e71b75
#2  0x106e72f03
#3  0x106dbb9f8
#4  0x106da8810
#5  0x106da90b2
#6  0x106da7a0f
#7  0x106e3d894

This error is from MacOS, but a similar one is emitted on Linux. I suspect an issue with ordering of things in the link command, but I'm not sure.

[LKedward]

Thanks for trying it out @everythingfunctional and reporting these. It appears there's a bug where tests and executables are only linked to non-library modules that they use directly. Non-library modules that are used via other modules are not added to the link list. Since this relates to the refactoring in #248, I will prepare a fix and tests for after that is merged.