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(libswipl,                  'PLLIBSWIPL', Format),
   73    print_flag(open_shared_object,        'PLSHARED',   Format),
   74    print_flag(threads,                   'PLTHREADS',  Format).
   75
   76print_flag(Flag, Var, Format) :-
   77    (   prolog:runtime_config(Flag, Value)
   78    ->  print_config(Format, Var, Value)
   79    ;   flag_value(Flag, Value)
   80    ->  print_config(Format, Var, Value)
   81    ;   true
   82    ).
   83
   84flag_value(Flag, Value) :-
   85    boolean_flag(Flag),
   86    (   current_prolog_flag(Flag, true)
   87    ->  Value = yes
   88    ;   Value = no
   89    ).
   90flag_value(c_libdir, Value) :-
   91    current_prolog_flag(home, Home),
   92    (   current_prolog_flag(c_libdir, Rel)
   93    ->  atomic_list_concat([Home, Rel], /, Value)
   94    ;   current_prolog_flag(windows, true)
   95    ->  atomic_list_concat([Home, bin], /, Value)
   96    ;   apple_bundle_libdir(LibDir)
   97    ->  Value = LibDir
   98    ;   current_prolog_flag(arch, Arch)
   99    ->  atomic_list_concat([Home, lib, Arch], /, Value)
  100    ).
  101flag_value(c_lib, '-lswipl').
  102flag_value(Flag, Value) :-
  103    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.

  111apple_bundle_libdir(LibDir) :-
  112    current_prolog_flag(apple, true),
  113    current_prolog_flag(executable, Exe),
  114    file_directory_name(Exe, ExeDir),
  115    file_base_name(ExeDir, 'MacOS'),
  116    file_directory_name(ExeDir, ContentsDir),
  117    file_base_name(ContentsDir, 'Contents'),
  118    atomic_list_concat([ContentsDir, 'Frameworks'], /, LibDir),
  119    exists_directory(LibDir).
  120
  121boolean_flag(threads).
  122boolean_flag(open_shared_object).
  123
  124print_config(sh, Var, Value) :-
  125    format('~w=\"~w\";~n', [Var, Value]).
  126print_config(cmd, Var, Value) :-
  127    (   file_var(Var)
  128    ->  prolog_to_os_filename(Value, OSValue),
  129	format('SET ~w=~w~n', [Var, OSValue])
  130    ;   format('SET ~w=~w~n', [Var, Value])
  131    ).
  132
  133file_var('PLBASE')