1/*  Part of SWI-Prolog
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (c)  2018-2019, VU University Amsterdam
    7			      CWI, Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   28    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   29    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   30    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   32    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(prolog_config,
   37          [ prolog_dump_runtime_variables/0,
   38            apple_bundle_libdir/1
   39          ]).

   47:- multifile
   48    prolog:runtime_config/2.

 prolog_dump_runtime_variables

Dump the current configuration in shell format. This predicate is called when Prolog is started using the commandline option `--dump-runtime-variables`

   56prolog_dump_runtime_variables :-
   57    (   '$cmd_option_val'(config, Format),
   58        Format \== ''
   59    ->  prolog_dump_runtime_variables(Format)
   60    ;   prolog_dump_runtime_variables(sh)
   61    ).
   62
   63prolog_dump_runtime_variables(Format) :-
   64    print_flag(home,                      'PLBASE',    Format),
   65    print_flag(arch,                      'PLARCH',    Format),
   66    print_flag(address_bits,              'PLBITS',    Format),
   67    print_flag(version,                   'PLVERSION', Format),
   68    print_flag(shared_object_extension,   'PLSOEXT',   Format),
   69    print_flag(shared_object_search_path, 'PLSOPATH',  Format),
   70    print_flag(c_libdir,                  'PLLIBDIR',  Format),
   71    print_flag(c_lib,                     'PLLIB',     Format),
   72    print_flag(open_shared_object,        'PLSHARED',  Format),
   73    print_flag(threads,                   'PLTHREADS', Format).
   74
   75print_flag(Flag, Var, Format) :-
   76    (   prolog:runtime_config(Flag, Value)
   77    ->  print_config(Format, Var, Value)
   78    ;   flag_value(Flag, Value)
   79    ->  print_config(Format, Var, Value)
   80    ;   true
   81    ).
   82
   83flag_value(Flag, Value) :-
   84    boolean_flag(Flag),
   85    (   current_prolog_flag(Flag, true)
   86    ->  Value = yes
   87    ;   Value = no
   88    ).
   89flag_value(c_libdir, Value) :-
   90    current_prolog_flag(home, Home),
   91    (   current_prolog_flag(c_libdir, Rel)
   92    ->  atomic_list_concat([Home, Rel], /, Value)
   93    ;   current_prolog_flag(windows, true)
   94    ->  atomic_list_concat([Home, bin], /, Value)
   95    ;   apple_bundle_libdir(LibDir)
   96    ->  Value = LibDir
   97    ;   current_prolog_flag(arch, Arch)
   98    ->  atomic_list_concat([Home, lib, Arch], /, Value)
   99    ).
  100flag_value(c_lib, '-lswipl').
  101flag_value(Flag, Value) :-
  102    current_prolog_flag(Flag, Value).

 apple_bundle_libdir(-LibDir)

If we are part of a MacOS bundle the C libraries are in the bundle Frameworks directory and the executable is in the bundle MacOS directory.

  110apple_bundle_libdir(LibDir) :-
  111    current_prolog_flag(apple, true),
  112    current_prolog_flag(executable, Exe),
  113    file_directory_name(Exe, ExeDir),
  114    file_base_name(ExeDir, 'MacOS'),
  115    file_directory_name(ExeDir, ContentsDir),
  116    file_base_name(ContentsDir, 'Contents'),
  117    atomic_list_concat([ContentsDir, 'Frameworks'], /, LibDir),
  118    exists_directory(LibDir).
  119
  120boolean_flag(threads).
  121boolean_flag(open_shared_object).
  122
  123print_config(sh, Var, Value) :-
  124    format('~w=\"~w\";~n', [Var, Value]).
  125print_config(cmd, Var, Value) :-
  126    (   file_var(Var)
  127    ->  prolog_to_os_filename(Value, OSValue),
  128        format('SET ~w=~w~n', [Var, OSValue])
  129    ;   format('SET ~w=~w~n', [Var, Value])
  130    ).
  131
  132file_var('PLBASE')