Add '-W/--warnings-as-errors' flag to GNATcheck

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

@@ -466,6 +466,12 @@ 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

@@ -543,9 +543,14 @@ package body Gnatcheck.Output is
 
    procedure Warning (Message : String) is
    begin
-      if Warning_Mode /= Quiet then
+      if Arg.Warnings_As_Errors.Get or else Warning_Mode /= Quiet then
          Error (Message);
       end if;
+
+      --  Force a non-zero return code when "warnings as errors" is enabled
+      if Arg.Warnings_As_Errors.Get then
+         Error_From_Warning := True;
+      end if;
    end Warning;
 
    ----------------
@@ -593,11 +598,12 @@ package body Gnatcheck.Output is
          Put_Line (" --target=targetname - specify a target for cross platforms");
          Put_Line (" --RTS=<runtime>     - use runtime <runtime>");
          Put_Line ("");
-         Put_Line (" -h   - print out the list of the available kp detectors");
-         Put_Line (" -jn  - n is the maximal number of processes");
-         Put_Line (" -q   - quiet mode (do not report detections in Stderr)");
-         Put_Line (" -v   - verbose mode");
-         Put_Line (" -l   - full pathname for file locations");
+         Put_Line (" -h                       - print out the list of the available kp detectors");
+         Put_Line (" -jn                      - n is the maximal number of processes");
+         Put_Line (" -q                       - quiet mode (do not report detections in Stderr)");
+         Put_Line (" -v                       - verbose mode");
+         Put_Line (" -W, --warnings-as-errors - treat warning messages as errors");
+         Put_Line (" -l                       - full pathname for file locations");
          Put_Line ("");
          Put_Line (" --brief                - brief mode, only report detections in Stderr");
          Put_Line (" --check-semantic       - check semantic validity of the source files");
@@ -636,18 +642,19 @@ package body Gnatcheck.Output is
       Put_Line (" --RTS=<runtime>           - use runtime <runtime>");
       Put_Line (" --config=<cgpr>           - use configuration project <cgpr>");
       Put_Line ("");
-      Put_Line (" -h   - print out the list of the currently implemented rules");
-      Put_Line (" -mn  - n is the maximal number of diagnoses in Stderr");
-      Put_Line ("        (n in 0 .. 1000, 0 means no limit); default is 0");
-      Put_Line (" -jn  - n is the maximal number of processes");
-      Put_Line (" -q   - quiet mode (do not report detections in Stderr)");
-      Put_Line (" -t   - report execution time in Stderr");
-      Put_Line (" -v   - verbose mode");
-      Put_Line (" -l   - full pathname for file locations");
-      Put_Line (" -log - duplicate all the messages sent to Stderr in gnatcheck.log");
-      Put_Line (" -s   - short form of the report file");
-      Put_Line (" -xml - generate report in XML format");
-      Put_Line (" -nt  - do not generate text report (enforces '-xml')");
+      Put_Line (" -h                       - print out the list of the currently implemented rules");
+      Put_Line (" -mn                      - n is the maximal number of diagnoses in Stderr");
+      Put_Line ("                            (n in 0 .. 1000, 0 means no limit); default is 0");
+      Put_Line (" -jn                      - n is the maximal number of processes");
+      Put_Line (" -q                       - quiet mode (do not report detections in Stderr)");
+      Put_Line (" -t                       - report execution time in Stderr");
+      Put_Line (" -v                       - verbose mode");
+      Put_Line (" -W, --warnings-as-errors - treat warning messages as errors");
+      Put_Line (" -l                       - full pathname for file locations");
+      Put_Line (" -log                     - duplicate all the messages sent to Stderr in gnatcheck.log");
+      Put_Line (" -s                       - short form of the report file");
+      Put_Line (" -xml                     - generate report in XML format");
+      Put_Line (" -nt                      - do not generate text report (enforces '-xml')");
       Put_Line ("");
       Put_Line (" --show-rule                - append rule names to diagnoses generated");
       Put_Line (" --show-instantiation-chain - show instantiation chain for reported generic construct");
@@ -668,9 +675,9 @@ package body Gnatcheck.Output is
       Put_Line (" -ox filename  - specify the name of the XML report file (enforces '-xml')");
       Put_Line ("");
       Put_Line (" filename                 - the name of the Ada source file to be analyzed.");
-      Put_Line ("                           Wildcards are allowed");
+      Put_Line ("                            Wildcards are allowed");
       Put_Line (" -files=filename          - the name of the text file containing a list of Ada");
-      Put_Line ("                           source files to analyze");
+      Put_Line ("                            source files to analyze");
       Put_Line (" --ignore=filename        - do not process sources listed in filename");
       Put_Line (" --rule-file=filename     - read rule configuration from the given LKQL file");
       Put_Line (" -r, --rule [rule_name]   - enable the given rule during the GNATcheck run (this option is cumulative)");

lkql_checker/src/gnatcheck-output.ads

@@ -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:
    --

lkql_checker/src/gnatcheck_main.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 =>

testsuite/tests/gnatcheck/warnings_as_errors/main.adb

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

testsuite/tests/gnatcheck/warnings_as_errors/rules.lkql

@@ -0,0 +1,4 @@
+val rules = @{
+    goto_statements,
+    restrictions: {arg: ["No_Recursion"]}
+}

testsuite/tests/gnatcheck/warnings_as_errors/test.out

@@ -0,0 +1,12 @@
+Without "warnings as errors"
+============================
+
+gnatcheck: restriction No_Recursion ignored (cannot be checked statically), use rule Recursive_Subprograms instead
+main.adb:3:04: goto statement
+
+With "warnings as errors"
+=========================
+
+gnatcheck: restriction No_Recursion ignored (cannot be checked statically), use rule Recursive_Subprograms instead
+main.adb:3:04: goto statement
+>>>program returned status code 2

testsuite/tests/gnatcheck/warnings_as_errors/test.yaml

@@ -0,0 +1,10 @@
+driver: gnatcheck
+format: brief
+input_sources:
+  - main.adb
+lkql_rule_file: rules.lkql
+tests:
+  - label: Without "warnings as errors"
+  - label: With "warnings as errors"
+    extra_args:
+      - -W