C++: Port to new just-based language test definition

Add justfiles for C++ following the pattern of other ported languages
(go, rust, swift). Move consistency queries from semmle-code's
semmlecode-cpp-consistency-queries/ to ql/cpp/ql/consistency-queries/.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

cpp/justfile

@@ -0,0 +1,7 @@
+import '../lib.just'
+
+[group('build')]
+build: (_build_dist "cpp")
+
+[group('test')]
+language-tests *EXTRA_ARGS: (_language_tests EXTRA_ARGS source_dir() 'ql/test' '../../semmlecode-cpp-tests')

cpp/ql/consistency-queries/badLocations.ql

@@ -0,0 +1,9 @@
+import cpp
+
+// Locations should either be :0:0:0:0 locations (UnknownLocation, or
+// a whole file), or all 4 fields should be positive.
+from Location l
+where
+  [l.getStartLine(), l.getEndLine(), l.getStartColumn(), l.getEndColumn()] != 0 and
+  [l.getStartLine(), l.getEndLine(), l.getStartColumn(), l.getEndColumn()] < 1
+select l

cpp/ql/consistency-queries/nullInToString.ql

@@ -0,0 +1,5 @@
+import cpp
+
+from Element e
+where e.toString().matches("%(null)%")
+select e

cpp/ql/consistency-queries/qlpack.yml

@@ -0,0 +1,5 @@
+name: codeql/cpp-consistency-queries
+groups: [cpp, test, consistency-queries]
+dependencies:
+  codeql/cpp-all: ${workspace}
+extractor: cpp

cpp/ql/consistency-queries/unusedLocations.ql

@@ -0,0 +1,10 @@
+import cpp
+
+from Location l
+where
+  not any(Element e).getLocation() = l and
+  not any(LambdaCapture lc).getLocation() = l and
+  not any(MacroAccess ma).getActualLocation() = l and
+  not any(NamespaceDeclarationEntry nde).getBodyLocation() = l and
+  not any(XmlLocatable xml).getLocation() = l
+select l

cpp/ql/consistency-queries/variableDeclarationsWithoutTypes.ql

@@ -0,0 +1,5 @@
+import cpp
+
+from VariableDeclarationEntry i
+where not exists(i.getType())
+select i

cpp/ql/consistency-queries/variablesWithoutTypes.ql

@@ -0,0 +1,5 @@
+import cpp
+
+from Variable i
+where not exists(i.getType())
+select i

cpp/ql/justfile

@@ -0,0 +1,6 @@
+import "../../lib.just"
+
+[no-cd]
+format *ARGS=".": (_format_ql ARGS)
+
+consistency_queries := source_dir() / "consistency-queries"

cpp/ql/test/justfile

@@ -0,0 +1,11 @@
+import "../justfile"
+
+base_flags := "--include-location-in-star"
+
+all_checks := default_db_checks + """\
+    --check-undefined-labels \
+    --check-unused-labels \
+    --consistency-queries=""" + consistency_queries
+
+[no-cd]
+test *ARGS=".": (_codeql_test "cpp" base_flags all_checks ARGS)