Merge branch 'topic/warnings_as_errors' into 'master'

Add the "-W/--warnings-as-errors" flag to GNATcheck

Closes #232

See merge request eng/libadalang/langkit-query-language!328

Author: HugoGGuerrier

lkql_checker/doc/gnatcheck_rm/using_gnatcheck.rst

@@ -270,6 +270,12 @@ The following switches control the general ``gnatcheck`` behavior
   Verbose mode; ``gnatcheck`` generates version information and then
   a trace of sources being processed.
 
+  .. index:: -W
+
+``-W, --warnings-as-errors``
+  Treat warnings raised by GNATcheck as errors, ensuring an erroneous return
+  code.
+
   .. index:: -o
 
 ``-o report_file``

lkql_checker/src/gnatcheck-options.ads

@@ -94,16 +94,6 @@ package Gnatcheck.Options is
    KP_Version : GNAT.OS_Lib.String_Access;
    --  If set, the relevant GNAT version to check when running gnatkp.
 
-   type Warning_Modes is
-     (Quiet,  --  all warnings are suppressed
-      Short,
-      Normal,
-      Full);
-
-   Warning_Mode : Warning_Modes := Normal;
-   --  Specifies the warning message level
-   --  '-w(q|s|n|f)
-
    Log_Mode : Boolean := False;
    --  Create the log file and duplicate in this file all the messages
    --  generated by a tool.
@@ -466,6 +456,12 @@ package Gnatcheck.Options is
          Help   => "emit a 'rules.lkql' file containing the rules "
                    & "configuration");
 
+      package Warnings_As_Errors is new Parse_Flag
+        (Parser => Parser,
+         Long   => "--warnings-as-errors",
+         Short  => "-W",
+         Help   => "Treat warning messages as errors");
+
       function Quiet_Mode return Boolean is (Quiet.Get or else Brief.Get);
 
       function Short_Report return Boolean is (Brief.Get or else Short.Get);

lkql_checker/src/gnatcheck-output.adb

@@ -18,6 +18,10 @@ package Gnatcheck.Output is
    Custom_XML_Report_File  : Boolean := False;
    --  Undicate if custom name is specified for text or XML output file
 
+   Error_From_Warning : Boolean;
+   --  Whether a warning message has been emitted while "warnings as errors"
+   --  mode is enabled. This ensure the return code of GNATcheck is not 0.
+
    procedure Print_Version_Info (Released_At : Positive);
    --  Prints into Stderr the tool version information in the following format:
    --
@@ -43,39 +47,19 @@ package Gnatcheck.Output is
    procedure Error_No_Tool_Name (Message : String);
    --  Sends into Stderr the error message with no tool name prefix
 
-   procedure Error_In_Tty (Message : String);
-   --  Same as ``Error`` but send the message only if Stderr is a TTY. Also,
-   --  ``Message`` is not added to the stderr log file.
+   procedure Warning (Message : String);
+   --  Same as ``Error``
+
+   procedure Info (Message : String);
+   --  Sends Message into Stderr (with no tool name prefix).
 
-   procedure SLOC_Error
-     (Message : String;
-      SLOC    : String);
-   --  Sends to Stderr the error message in the following format:
-   --  'SLOC:Tool_Name:Message', where SLOC is the GNAT-style source location.
+   procedure Info_No_EOL (Message : String);
+   --  The same as ``Info``, but does not output a (platform-specific) EOL
+   --  character(s) after ``Message``.
 
-   procedure Warning (Message : String);
-   --  Same as Error, but do nothing if Warning_Mode = Quiet.
-
-   procedure Info
-     (Message  : String;
-      Line_Len : Natural := 0;
-      Spacing  : Natural := 0);
-   --  Sends Message as a separate line(s) into Stderr (with no tool name
-   --  prefix). If Line_Len is set to some positive value, it is treated as a
-   --  maximal length of the text to be placed into one output line, and if the
-   --  length of Message exceeds Line_Len, this procedure tries to split
-   --  Message treating spaces as word separators and prints the rest of the
-   --  Message on the next line(s). Each continuation line starts from Spacing
-   --  number of space characters. Message can be split only on borders of
-   --  words.
-
-   procedure Info_No_EOL
-     (Message  : String;
-      Line_Len : Natural := 0;
-      Spacing  : Natural := 0);
-   --  The same as Info, but does not "close" the last line being printed out,
-   --  that is, the last line does not contain a (platform-specific) EOL
-   --  character(s).
+   procedure Info_In_Tty (Message : String);
+   --  Same as ``Info`` but send the message only if Stderr is a TTY. Also,
+   --  ``Message`` is not added to the current ``Log_File``.
 
    Indent_String : constant String := "   ";
    --  Used as indentation element in various output

lkql_checker/src/gnatcheck-output.ads

@@ -1212,13 +1212,14 @@ package body Gnatcheck.Projects is
                   Individual_Rules_Set := True;
             end case;
             if not Rules_Depreciation_Emitted then
-               Error_In_Tty
+               Info_In_Tty
                  ("The '-rules' section is now deprecated. You should only " &
                   "use the '--rule' and '--rule-file' command-line options.");
-               Error_In_Tty
+               Info_In_Tty
                  ("You can use the '--emit-lkql-rule-file' flag to " &
                   "automatically translate your rule configuration to the " &
                   "new LKQL format.");
+               Rules_Depreciation_Emitted := True;
             end if;
          end loop;
       end Process_Sections;

lkql_checker/src/gnatcheck-projects.adb

@@ -1052,9 +1052,9 @@ package body Gnatcheck.Rules.Rule_Table is
                 then To_String (Instance.Defined_At)
                 else "command line") & Diag_Defined_At);
             if not Instance_Help_Emitted then
-               Warning
+               Info
                  ("if you want to pass multiple parameters to a rule you " &
-                  "should use the comma separated notation: e.g. " &
+                  "should use the comma separated notation: e.g. "         &
                   "+RMy_Rule:Param1,Param2");
                Instance_Help_Emitted := True;
             end if;

lkql_checker/src/gnatcheck-rules-rule_table.adb

@@ -2804,11 +2804,9 @@ package body Gnatcheck.Rules is
    procedure Print_Rule_Help (Rule : Rule_Info) is
    begin
       Info
-        (Message  =>
-           " " & Rule_Name (Rule) & " - " &
-           To_String (Rule.Help_Info) & " - " &
-           Rule.Remediation_Level'Img,
-         Line_Len => 0, Spacing => 0);
+        (" " & Rule_Name (Rule) & " - " &
+         To_String (Rule.Help_Info) & " - " &
+         Rule.Remediation_Level'Img);
    end Print_Rule_Help;
 
    ---------------------------------------

lkql_checker/src/gnatcheck-rules.adb

@@ -604,22 +604,25 @@ begin
    Gnatcheck.Rules.Rule_Table.Clean_Up;
    Close_Log_File;
 
-   OS_Exit (if Tool_Failures /= 0 or else Detected_Internal_Error /= 0
-            then                                    E_Error
-            elsif Missing_Rule_File_Detected   then E_Missing_Rule_File
-            elsif Bad_Rule_Detected            then E_Missing_Rule
-            elsif Rule_Option_Problem_Detected then E_Bad_Rules
-            elsif Missing_File_Detected        then E_Missing_Source
-
-            --  If we are here, no problem with gnatcheck execution or rule
-            --  option or missing file definition is detected, so we can trust
-            --  gnatcheck results.
-
-            elsif (Detected_Non_Exempted_Violations > 0
-                or else Detected_Compiler_Error > 0)
-                 and then not Arg.Brief_Mode
-            then E_Violation
-            else E_Success);
+   OS_Exit
+     (if Tool_Failures /= 0
+        or else Detected_Internal_Error /= 0
+        or else Error_From_Warning
+      then                                    E_Error
+      elsif Missing_Rule_File_Detected   then E_Missing_Rule_File
+      elsif Bad_Rule_Detected            then E_Missing_Rule
+      elsif Rule_Option_Problem_Detected then E_Bad_Rules
+      elsif Missing_File_Detected        then E_Missing_Source
+
+      --  If we are here, no problem with gnatcheck execution or rule
+      --  option or missing file definition is detected, so we can trust
+      --  gnatcheck results.
+
+      elsif (Detected_Non_Exempted_Violations > 0
+      or else Detected_Compiler_Error > 0)
+      and then not Arg.Brief_Mode
+      then E_Violation
+      else E_Success);
 
 exception
    when Parameter_Error =>

lkql_checker/src/gnatcheck_main.adb

@@ -1,3 +1,3 @@
-gnatcheck: The '-rules' section is now deprecated. You should only use the '--rule' and '--rule-file' command-line options.
-gnatcheck: You can use the '--emit-lkql-rule-file' flag to automatically translate your rule configuration to the new LKQL format.
+The '-rules' section is now deprecated. You should only use the '--rule' and '--rule-file' command-line options.
+You can use the '--emit-lkql-rule-file' flag to automatically translate your rule configuration to the new LKQL format.
 main.adb:3:04: goto statement

testsuite/tests/gnatcheck/rules_depreciation_message/test.out

@@ -0,0 +1,5 @@
+procedure Main is
+begin
+   goto lbl;  --  FLAG (2)
+   <<lbl>>
+end Main;