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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                               U S A G E                                  --
--                                                                          --
--                                B o d y                                   --
--                                                                          --
--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------
 
--  Warning: the output of this usage for warnings is duplicated in the GNAT
--  reference manual. Be sure to update that if you change the warning list.
 
with Targparm; use Targparm;
with Namet;    use Namet;
with Opt;      use Opt;
with Osint;    use Osint;
with Output;   use Output;
 
with System.WCh_Con; use System.WCh_Con;
 
procedure Usage is
 
   procedure Write_Switch_Char (Sw : String; Prefix : String := "gnat");
   --  Output two spaces followed by the switch character minus followed
   --  Prefix, followed by the string given as the argument, and then enough
   --  blanks to tab to column 13, i.e. assuming Sw is not longer than 5
   --  characters, the maximum allowed, Write_Switch_Char will always output
   --  exactly 12 characters.
 
   -----------------------
   -- Write_Switch_Char --
   -----------------------
 
   procedure Write_Switch_Char (Sw : String; Prefix : String := "gnat") is
   begin
      Write_Str ("  -");
      Write_Str (Prefix);
      Write_Str (Sw);
 
      for J in 1 .. 12 - 3 - Prefix'Length - Sw'Length loop
         Write_Char (' ');
      end loop;
   end Write_Switch_Char;
 
--  Start of processing for Usage
 
begin
   Find_Program_Name;
 
   --  For gnatmake, we are appending this information to the end of
   --  the normal gnatmake output, so generate appropriate header
 
   if Name_Len >= 8
     and then (Name_Buffer (Name_Len - 7 .. Name_Len) = "gnatmake"
                 or else
               Name_Buffer (Name_Len - 7 .. Name_Len) = "GNATMAKE")
   then
      Write_Eol;
      Write_Line ("Compiler switches (passed to the compiler by gnatmake):");
 
   else
      --  Usage line
 
      Write_Str ("Usage: ");
      Write_Program_Name;
      Write_Char (' ');
      Write_Str ("switches sfile");
      Write_Eol;
      Write_Eol;
 
      --  Line for sfile
 
      Write_Line ("  sfile     Source file name");
   end if;
 
   Write_Eol;
 
   --  Common GCC switches not available for JVM, .NET, and AAMP targets
 
   if VM_Target = No_VM and then not AAMP_On_Target then
      Write_Switch_Char ("fstack-check ", "");
      Write_Line ("Generate stack checking code");
 
      Write_Switch_Char ("fno-inline   ", "");
      Write_Line ("Inhibit all inlining (makes executable smaller)");
 
      Write_Switch_Char ("fpreserve-control-flow ", "");
      Write_Line ("Preserve control flow for coverage analysis");
   end if;
 
   --  Common switches available to both GCC and JGNAT
 
   Write_Switch_Char ("g            ", "");
   Write_Line ("Generate debugging information");
 
   Write_Switch_Char ("Idir         ", "");
   Write_Line ("Specify source files search path");
 
   Write_Switch_Char ("I-           ", "");
   Write_Line ("Do not look for sources in current directory");
 
   Write_Switch_Char ("O[0123]      ", "");
   Write_Line ("Control the optimization level");
 
   Write_Eol;
 
   --  Individual lines for switches. Write_Switch_Char outputs fourteen
   --  characters, so the remaining message is allowed to be a maximum
   --  of 65 characters to be comfortable on an 80 character device.
   --  If the Write_Str fits on one line, it is short enough!
 
   --  Line for -gnata switch
 
   Write_Switch_Char ("a");
   Write_Line ("Assertions enabled. Pragma Assert/Debug to be activated");
 
   --  Line for -gnatA switch
 
   Write_Switch_Char ("A");
   Write_Line ("Avoid processing gnat.adc, if present file will be ignored");
 
   --  Line for -gnatb switch
 
   Write_Switch_Char ("b");
   Write_Line ("Generate brief messages to stderr even if verbose mode set");
 
   --  Line for -gnatB switch
 
   Write_Switch_Char ("B");
   Write_Line ("Assume no bad (invalid) values except in 'Valid attribute");
 
   --  Line for -gnatc switch
 
   Write_Switch_Char ("c");
   Write_Line ("Check syntax and semantics only (no code generation)");
 
   --  Line for -gnatC switch
 
   Write_Switch_Char ("C");
   Write_Line ("Generate CodePeer information (no code generation)");
 
   --  Line for -gnatd switch
 
   Write_Switch_Char ("d?");
   Write_Line ("Compiler debug option ? ([.]a-z,A-Z,0-9), see debug.adb");
 
   --  Line for -gnatD switch
 
   Write_Switch_Char ("D");
   Write_Line ("Debug expanded generated code (max line length = 72)");
   Write_Switch_Char ("Dnn");
   Write_Line ("Debug expanded generated code (max line length = nn)");
 
   --  Line for -gnatec switch
 
   Write_Switch_Char ("ec=?");
   Write_Line ("Specify configuration pragmas file, e.g. -gnatec=/x/f.adc");
 
   --  Line for -gnateD switch
 
   Write_Switch_Char ("eD?");
   Write_Line ("Define or redefine preprocessing symbol, e.g. -gnateDsym=val");
 
   --  Line for -gnatef switch
 
   Write_Switch_Char ("ef");
   Write_Line ("Full source path in brief error messages");
 
   --  Line for -gnateG switch
 
   Write_Switch_Char ("eG");
   Write_Line ("Generate preprocessed source");
 
   --  Line for -gnateI switch
 
   Write_Switch_Char ("eInn");
   Write_Line ("Index in multi-unit source, e.g. -gnateI2");
 
   --  Line for -gnatem switch
 
   Write_Switch_Char ("em=?");
   Write_Line ("Specify mapping file, e.g. -gnatem=mapping");
 
   --  Line for -gnatep switch
 
   Write_Switch_Char ("ep=?");
   Write_Line ("Specify preprocessing data file, e.g. -gnatep=prep.data");
 
   --  Line for -gnateS switch
 
   Write_Switch_Char ("eS");
   Write_Line ("Generate SCO (Source Coverage Obligation) information");
 
   --  Line for -gnatE switch
 
   Write_Switch_Char ("E");
   Write_Line ("Dynamic elaboration checking mode enabled");
 
   --  Line for -gnatf switch
 
   Write_Switch_Char ("f");
   Write_Line ("Full errors. Verbose details, all undefined references");
 
   --  Line for -gnatF switch
 
   Write_Switch_Char ("F");
   Write_Line ("Force all import/export external names to all uppercase");
 
   --  Line for -gnatg switch
 
   Write_Switch_Char ("g");
   Write_Line ("GNAT implementation mode (used for compiling GNAT units)");
 
   --  Lines for -gnatG switch
 
   Write_Switch_Char ("G");
   Write_Line ("Output generated expanded code (max line length = 72)");
   Write_Switch_Char ("Gnn");
   Write_Line ("Output generated expanded code (max line length = nn)");
 
   --  Line for -gnath switch
 
   Write_Switch_Char ("h");
   Write_Line ("Output this usage (help) information");
 
   --  Line for -gnati switch
 
   Write_Switch_Char ("i?");
   Write_Line ("Identifier char set (?=1/2/3/4/5/8/9/p/f/n/w)");
 
   --  Line for -gnatI switch
 
   Write_Switch_Char ("I");
   Write_Line ("Ignore all representation clauses");
 
   --  Line for -gnatj switch
 
   Write_Switch_Char ("jnn");
   Write_Line ("Format error and warning messages to fit nn character lines");
 
   --  Line for -gnatk switch
 
   Write_Switch_Char ("k");
   Write_Line ("Limit file names to nn characters (k = krunch)");
 
   --  Lines for -gnatl switch
 
   Write_Switch_Char ("l");
   Write_Line ("Output full source listing with embedded error messages");
   Write_Switch_Char ("l=f");
   Write_Line ("Output full source listing to specified file");
 
   --  Line for -gnatL switch
 
   Write_Switch_Char ("L");
   Write_Line ("List corresponding source text in -gnatG or -gnatD output");
 
   --  Line for -gnatm switch
 
   Write_Switch_Char ("mnn");
   Write_Line ("Limit number of detected errors/warnings to nn (1-999999)");
 
   --  Line for -gnatn switch
 
   Write_Switch_Char ("n");
   Write_Line ("Inlining of subprograms (apply pragma Inline across units)");
 
   --  Line for -gnatN switch
 
   Write_Switch_Char ("N");
   Write_Line ("Full (frontend) inlining of subprograms");
 
   --  Line for -gnato switch
 
   Write_Switch_Char ("o");
   Write_Line ("Enable overflow checking (off by default)");
 
   --  Line for -gnatO switch
 
   Write_Switch_Char ("O nm ");
   Write_Line ("Set name of output ali file (internal switch)");
 
   --  Line for -gnatp switch
 
   Write_Switch_Char ("p");
   Write_Line ("Suppress all checks");
 
   --  Line for -gnatP switch
 
   Write_Switch_Char ("P");
   Write_Line ("Generate periodic calls to System.Polling.Poll");
 
   --  Line for -gnatq switch
 
   Write_Switch_Char ("q");
   Write_Line ("Don't quit, try semantics, even if parse errors");
 
   --  Line for -gnatQ switch
 
   Write_Switch_Char ("Q");
   Write_Line ("Don't quit, write ali/tree file even if compile errors");
 
   --  Line for -gnatr switch
 
   Write_Switch_Char ("r");
   Write_Line ("Treat pragma Restrictions as Restriction_Warnings");
 
   --  Lines for -gnatR switch
 
   Write_Switch_Char ("R?");
   Write_Line ("List rep info (?=0/1/2/3 for none/types/all/variable)");
   Write_Switch_Char ("R?s");
   Write_Line ("List rep info to file.rep instead of standard output");
 
   --  Lines for -gnats switch
 
   Write_Switch_Char ("s");
   Write_Line ("Syntax check only");
 
   --  Lines for -gnatS switch
 
   Write_Switch_Char ("S");
   Write_Line ("Print listing of package Standard");
 
   --  Lines for -gnatt switch
 
   Write_Switch_Char ("t");
   Write_Line ("Tree output file to be generated");
 
   --  Line for -gnatT switch
 
   Write_Switch_Char ("Tnn");
   Write_Line ("All compiler tables start at nn times usual starting size");
 
   --  Line for -gnatu switch
 
   Write_Switch_Char ("u");
   Write_Line ("List units for this compilation");
 
   --  Line for -gnatU switch
 
   Write_Switch_Char ("U");
   Write_Line ("Enable unique tag for error messages");
 
   --  Line for -gnatv switch
 
   Write_Switch_Char ("v");
   Write_Line ("Verbose mode. Full error output with source lines to stdout");
 
   --  Line for -gnatV switch
 
   Write_Switch_Char ("Vxx");
   Write_Line
     ("Enable selected validity checking mode, xx = list of parameters:");
   Write_Line ("        a    turn on all validity checking options");
   Write_Line ("        c    turn on checking for copies");
   Write_Line ("        C    turn off checking for copies");
   Write_Line ("        d    turn on default (RM) checking");
   Write_Line ("        D    turn off default (RM) checking");
   Write_Line ("        e    turn on checking for elementary components");
   Write_Line ("        E    turn off checking for elementary components");
   Write_Line ("        f    turn on checking for floating-point");
   Write_Line ("        F    turn off checking for floating-point");
   Write_Line ("        i    turn on checking for in params");
   Write_Line ("        I    turn off checking for in params");
   Write_Line ("        m    turn on checking for in out params");
   Write_Line ("        M    turn off checking for in out params");
   Write_Line ("        o    turn on checking for operators/attributes");
   Write_Line ("        O    turn off checking for operators/attributes");
   Write_Line ("        p    turn on checking for parameters");
   Write_Line ("        P    turn off checking for parameters");
   Write_Line ("        r    turn on checking for returns");
   Write_Line ("        R    turn off checking for returns");
   Write_Line ("        s    turn on checking for subscripts");
   Write_Line ("        S    turn off checking for subscripts");
   Write_Line ("        t    turn on checking for tests");
   Write_Line ("        T    turn off checking for tests");
   Write_Line ("        n    turn off all validity checks (including RM)");
 
   --  Lines for -gnatw switch
 
   Write_Switch_Char ("wxx");
   Write_Line ("Enable selected warning modes, xx = list of parameters:");
   Write_Line ("        a    turn on all optional info/warnings " &
                                                  "(except dhl.ot.w)");
   Write_Line ("        A    turn off all optional info/warnings");
   Write_Line ("        .a*  turn on warnings for failing assertion");
   Write_Line ("        .A   turn off warnings for failing assertion");
   Write_Line ("        b    turn on warnings for bad fixed value " &
                                                  "(not multiple of small)");
   Write_Line ("        B*   turn off warnings for bad fixed value " &
                                                  "(not multiple of small)");
   Write_Line ("        .b*  turn on warnings for biased representation");
   Write_Line ("        .B   turn off warnings for biased representation");
   Write_Line ("        c    turn on warnings for constant conditional");
   Write_Line ("        C*   turn off warnings for constant conditional");
   Write_Line ("        .c   turn on warnings for unrepped components");
   Write_Line ("        .C*  turn off warnings for unrepped components");
   Write_Line ("        d    turn on warnings for implicit dereference");
   Write_Line ("        D*   turn off warnings for implicit dereference");
   Write_Line ("        e    treat all warnings (but not info) as errors");
   Write_Line ("        .e   turn on every optional info/warning " &
                                                  "(no exceptions)");
   Write_Line ("        f    turn on warnings for unreferenced formal");
   Write_Line ("        F*   turn off warnings for unreferenced formal");
   Write_Line ("        g*   turn on warnings for unrecognized pragma");
   Write_Line ("        G    turn off warnings for unrecognized pragma");
   Write_Line ("        h    turn on warnings for hiding variable");
   Write_Line ("        H*   turn off warnings for hiding variable");
   Write_Line ("        i*   turn on warnings for implementation unit");
   Write_Line ("        I    turn off warnings for implementation unit");
   Write_Line ("        .i   turn on warnings for overlapping actuals");
   Write_Line ("        .I*  turn off warnings for overlapping actuals");
   Write_Line ("        j    turn on warnings for obsolescent " &
                                                  "(annex J) feature");
   Write_Line ("        J*   turn off warnings for obsolescent " &
                                                  "(annex J) feature");
   Write_Line ("        k    turn on warnings on constant variable");
   Write_Line ("        K*   turn off warnings on constant variable");
   Write_Line ("        l    turn on warnings for missing " &
                                                  "elaboration pragma");
   Write_Line ("        L*   turn off warnings for missing " &
                                                  "elaboration pragma");
   Write_Line ("        m    turn on warnings for variable assigned " &
                                                  "but not read");
   Write_Line ("        M*   turn off warnings for variable assigned " &
                                                  "but not read");
   Write_Line ("        .m*  turn on warnings for suspicious modulus value");
   Write_Line ("        .M   turn off warnings for suspicious modulus value");
   Write_Line ("        n*   normal warning mode (cancels -gnatws/-gnatwe)");
   Write_Line ("        o*   turn on warnings for address clause overlay");
   Write_Line ("        O    turn off warnings for address clause overlay");
   Write_Line ("        .o   turn on warnings for out parameters assigned " &
                                                  "but not read");
   Write_Line ("        .O*  turn off warnings for out parameters assigned " &
                                                  "but not read");
   Write_Line ("        p    turn on warnings for ineffective pragma " &
                                                  "Inline in frontend");
   Write_Line ("        P*   turn off warnings for ineffective pragma " &
                                                  "Inline in frontend");
   Write_Line ("        .p   turn on warnings for suspicious parameter " &
                                                  "order");
   Write_Line ("        .P*  turn off warnings for suspicious parameter " &
                                                  "order");
   Write_Line ("        q*   turn on warnings for questionable " &
                                                  "missing parenthesis");
   Write_Line ("        Q    turn off warnings for questionable " &
                                                  "missing parenthesis");
   Write_Line ("        r    turn on warnings for redundant construct");
   Write_Line ("        R*   turn off warnings for redundant construct");
   Write_Line ("        .r   turn on warnings for object renaming function");
   Write_Line ("        .R*  turn off warnings for object renaming function");
   Write_Line ("        s    suppress all info/warnings");
   Write_Line ("        t    turn on warnings for tracking deleted code");
   Write_Line ("        T*   turn off warnings for tracking deleted code");
   Write_Line ("        u    turn on warnings for unused entity");
   Write_Line ("        U*   turn off warnings for unused entity");
   Write_Line ("        v*   turn on warnings for unassigned variable");
   Write_Line ("        V    turn off warnings for unassigned variable");
   Write_Line ("        .v*  turn on info messages for reverse bit order");
   Write_Line ("        .V   turn off info messages for reverse bit order");
   Write_Line ("        w*   turn on warnings for wrong low bound assumption");
   Write_Line ("        W    turn off warnings for wrong low bound " &
                                                  "assumption");
   Write_Line ("        .w   turn on warnings on pragma Warnings Off");
   Write_Line ("        .W*  turn off warnings on pragma Warnings Off");
   Write_Line ("        x*   turn on warnings for export/import");
   Write_Line ("        X    turn off warnings for export/import");
   Write_Line ("        .x   turn on warnings for non-local exception");
   Write_Line ("        .X*  turn off warnings for non-local exception");
   Write_Line ("        y*   turn on warnings for Ada 2005 incompatibility");
   Write_Line ("        Y    turn off warnings for Ada 2005 incompatibility");
   Write_Line ("        z*   turn on warnings for suspicious " &
                                                  "unchecked conversion");
   Write_Line ("        Z    turn off warnings for suspicious " &
                                                  "unchecked conversion");
   Write_Line ("        *    indicates default in above list");
 
   --  Line for -gnatW switch
 
   Write_Switch_Char ("W");
   Write_Str ("Wide character encoding method (");
 
   for J in WC_Encoding_Method loop
      Write_Char (WC_Encoding_Letters (J));
 
      if J = WC_Encoding_Method'Last then
         Write_Char (')');
      else
         Write_Char ('/');
      end if;
   end loop;
 
   Write_Eol;
 
   --  Line for -gnatx switch
 
   Write_Switch_Char ("x");
   Write_Line ("Suppress output of cross-reference information");
 
   --  Line for -gnatX switch
 
   Write_Switch_Char ("X");
   Write_Line ("Language extensions permitted");
 
   --  Lines for -gnaty switch
 
   Write_Switch_Char ("y");
   Write_Line ("Enable default style checks (same as -gnaty3abcefhiklmnprst)");
   Write_Switch_Char ("yxx");
   Write_Line ("Enable selected style checks xx = list of parameters:");
   Write_Line ("        1-9  check indentation");
   Write_Line ("        a    check attribute casing");
   Write_Line ("        A    check array attribute indexes");
   Write_Line ("        b    check no blanks at end of lines");
   Write_Line ("        B    check no use of AND/OR for boolean expressions");
   Write_Line ("        c    check comment format");
   Write_Line ("        d    check no DOS line terminators");
   Write_Line ("        e    check end/exit labels present");
   Write_Line ("        f    check no form feeds/vertical tabs in source");
   Write_Line ("        g    check standard GNAT style rules");
   Write_Line ("        h    check no horizontal tabs in source");
   Write_Line ("        i    check if-then layout");
   Write_Line ("        I    check mode in");
   Write_Line ("        k    check casing rules for keywords");
   Write_Line ("        l    check reference manual layout");
   Write_Line ("        Lnn  check max nest level < nn ");
   Write_Line ("        m    check line length <= 79 characters");
   Write_Line ("        n    check casing of package Standard identifiers");
   Write_Line ("        Mnn  check line length <= nn characters");
   Write_Line ("        N    turn off all checks");
   Write_Line ("        o    check subprogram bodies in alphabetical order");
   Write_Line ("        O    check overriding indicators");
   Write_Line ("        p    check pragma casing");
   Write_Line ("        r    check casing for identifier references");
   Write_Line ("        s    check separate subprogram specs present");
   Write_Line ("        S    check separate lines after THEN or ELSE");
   Write_Line ("        t    check token separation rules");
   Write_Line ("        u    check no unnecessary blank lines");
   Write_Line ("        x    check extra parentheses around conditionals");
   Write_Line ("        y    turn on default style checks");
   Write_Line ("        -    subtract (turn off) subsequent checks");
   Write_Line ("        +    add (turn on) subsequent checks");
 
   --  Lines for -gnatyN switch
 
   Write_Switch_Char ("yN");
   Write_Line ("Cancel all previously set style checks");
 
   --  Lines for -gnatzc switch
 
   Write_Switch_Char ("zc");
   Write_Line ("Distribution stub generation for caller stubs");
 
   --  Lines for -gnatzr switch
 
   Write_Switch_Char ("zr");
   Write_Line ("Distribution stub generation for receiver stubs");
 
   --  Line for -gnat83 switch
 
   Write_Switch_Char ("83");
   Write_Line ("Enforce Ada 83 restrictions");
 
   --  Line for -gnat95 switch
 
   Write_Switch_Char ("95");
 
   if Ada_Version_Default = Ada_95 then
      Write_Line ("Ada 95 mode (default)");
   else
      Write_Line ("Enforce Ada 95 restrictions");
   end if;
 
   --  Line for -gnat05 switch
 
   Write_Switch_Char ("05");
 
   if Ada_Version_Default = Ada_05 then
      Write_Line ("Ada 2005 mode (default)");
   else
      Write_Line ("Allow Ada 2005 extensions");
   end if;
 
end Usage;