Add an UNSPEC_PROLOGUE_USE to prevent the link register from being considered dead.
[official-gcc.git] / gcc / ada / switch-c.ads
blobe6f9d7f84bf7c01726f7fc3dad62819b9a4f1a26
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S W I T C H - C --
6 -- --
7 -- S p e c --
8 -- --
9 -- --
10 -- Copyright (C) 2001 Free Software Foundation, Inc. --
11 -- --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
22 -- --
23 -- GNAT was originally developed by the GNAT team at New York University. --
24 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 -- --
26 ------------------------------------------------------------------------------
28 -- This package scans front end switches. Note that the body of Usage must be
29 -- coordinated with the switches that are recognized by this package.
30 -- The Usage package also acts as the official documentation for the
31 -- switches that are recognized. In addition, package Debug documents
32 -- the otherwise undocumented debug switches that are also recognized.
34 package Switch.C is
36 procedure Scan_Front_End_Switches (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 is encountered.
45 end Switch.C;