Merge branch 'topic/448' into 'master'

Properly exit GNATCheck for wrong combination of parameters

Closes #448

See merge request eng/libadalang/langkit-query-language!496

Author: thvnx

lkql_checker/src/gnatcheck-rules-rule_table.adb

@@ -1786,6 +1786,13 @@ package body Gnatcheck.Rules.Rule_Table is
 
    procedure Turn_All_Rules_On is
    begin
+      if Arg.Emit_LKQL_Rule_File.Get then
+         Error
+           ("cannot turn on all rules when --emit-lkql-rule-file"
+            & " option is enabled");
+         raise Gnatcheck.Options.Parameter_Error;
+      end if;
+
       for Rule_Cursor in All_Rules.Iterate loop
          declare
             Rule          : constant Rule_Info := All_Rules (Rule_Cursor);

testsuite/tests/gnatcheck_errors/emit_lkql_rule_file_all/test.out

@@ -0,0 +1,4 @@
+testsuite_driver: No output file generated by gnatcheck
+gnatcheck: error: cannot turn on all rules when --emit-lkql-rule-file option is enabled
+try "gnatcheck --help" for more information.
+>>>program returned status code 2

testsuite/tests/gnatcheck_errors/emit_lkql_rule_file_all/test.yaml

@@ -0,0 +1,6 @@
+driver: gnatcheck
+description: Test the error message when using '--emit-lkql-rule-file' with `+ALL` in the `-rules` section
+rules:
+  - +ALL
+extra_args:
+  - --emit-lkql-rule-file