1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This package defines some system dependent parameters for GNAT. These
33 -- are parameters that are relevant to the host machine on which the
34 -- compiler is running, and thus this package is part of the compiler.
45 pragma Import (C, Gnat_VMSp, "__gnat_vmsp");
47 OpenVMS : Boolean := Gnat_VMSp /= 0;
48 -- Set True for OpenVMS host. See also OpenVMS target boolean in
49 -- system-vms.ads and system-vms_64.ads and OpenVMS_On_Target boolean in
50 -- Targparm. This is not a constant, because it can be modified by -gnatdm.
52 Direct_Separator : constant Character;
53 pragma Import (C, Direct_Separator, "__gnat_dir_separator");
54 Normalized_CWD : constant String := "." & Direct_Separator;
55 -- Normalized string to access current directory
57 Max_Line_Length : constant := Types.Column_Number'Pred
58 (Types.Column_Number'Last);
59 -- Maximum source line length. By default we set it to the maximum
60 -- value that can be supported, which is given by the range of the
61 -- Column_Number type. We subtract 1 because need to be able to
62 -- have a valid Column_Number equal to Max_Line_Length to represent
63 -- the location of a "line too long" error.
64 -- 200 is the minimum value required (RM 2.2(15)). The value set here
65 -- can be reduced by the explicit use of the -gnatyM style switch.
67 Max_Name_Length : constant := 1024;
68 -- Maximum length of unit name (including all dots, and " (spec)") and
69 -- of file names in the library, must be at least Max_Line_Length, but
72 Max_Instantiations : constant := 8000;
73 -- Maximum number of instantiations permitted (to stop runaway cases
74 -- of nested instantiations). These situations probably only occur in
75 -- specially concocted test cases.
77 Tag_Errors : constant Boolean := False;
78 -- If set to true, then brief form error messages will be prefaced by
79 -- the string "error:". Used as default for Opt.Unique_Error_Tag.
81 Exclude_Missing_Objects : constant Boolean := True;
82 -- If set to true, gnatbind will exclude from consideration all
83 -- non-existent .o files.
85 Max_Debug_Name_Length : constant := 256;
86 -- If a generated qualified debug name exceeds this length, then it
87 -- is automatically compressed, regardless of the setting of the
88 -- Compress_Debug_Names switch controlled by -gnatC.