1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 2001-2009, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package scans front end switches. Note that the body of Usage must be
27 -- coordinated with the switches that are recognized by this package.
28 -- The Usage package also acts as the official documentation for the
29 -- switches that are recognized. In addition, package Debug documents
30 -- the otherwise undocumented debug switches that are also recognized.
34 procedure Scan_Front_End_Switches
35 (Switch_Chars : String;
37 -- Procedures to scan out front end switches stored in the given string.
38 -- The first character is known to be a valid switch character, and there
39 -- are no blanks or other switch terminator characters in the string, so
40 -- the entire string should consist of valid switch characters, except that
41 -- an optional terminating NUL character is allowed. A bad switch causes
42 -- a fatal error exit and control does not return. The call also sets
43 -- Usage_Requested to True if a switch -gnath is encountered.
45 -- Arg_Rank is the position of the switch in the command line arguments.
46 -- It is used for certain switches -gnatx to check if a subsequent switch
47 -- -gnat-x cancels the switch -gnatx.