Testing for unused objects - whole program analysis and configurations

test/cli/whole-program/configs_unused.c

@@ -0,0 +1,18 @@
+// cppcheck-suppress misra-c2012-2.3
+typedef struct {
+    int x; // cppcheck-suppress unusedStructMember
+} X;
+
+static void func(void) {};
+
+int main(void) {
+    #ifdef A
+    X x = {5};
+    func();
+    return x.x;
+
+    #elif defined(B)
+    return 0;
+    #endif
+
+}

test/cli/whole-program_test.py

@@ -11,15 +11,17 @@
 # TODO: test CheckBufferOverrun
 
 
-def __create_compile_commands(dir, entries):
+def __create_compile_commands(dir, filePaths, definesList=[[None]]):
     j = []
-    for e in entries:
-        f = os.path.basename(e)
-        obj = {
-            'directory': os.path.dirname(os.path.abspath(e)),
-            'command': 'gcc -c {}'.format(f),
-            'file': f
-        }
+    for i, fp in enumerate(filePaths):
+        f = os.path.basename(fp)
+
+        for defines in (definesList[i] if len(definesList) > i else [None]):
+            obj = {
+                'directory': os.path.dirname(os.path.abspath(fp)),
+                'command': 'gcc -c {} {}'.format(f, ' '.join('-D{}'.format(define) for define in defines) if defines is not None else ''),
+                'file': f
+            }
         j.append(obj)
     compile_commands = os.path.join(dir, 'compile_commmands.json')
     with open(compile_commands, 'wt') as f:
@@ -295,3 +297,88 @@ def test_checkclass_project_builddir(tmpdir):
     build_dir = os.path.join(tmpdir, 'b1')
     os.mkdir(build_dir)
     __test_checkclass_project(tmpdir, ['-j1', '--cppcheck-build-dir={}'.format(build_dir)])
+
+def test_unused_A_B():
+    args = [
+        '-q',
+        '--addon=misra',
+        '--template=simple',
+        '--enable=all',
+        '--error-exitcode=1',
+        'whole-program/configs_unused.c'
+    ]
+
+    ret, stdout, stderr = cppcheck(args, cwd=__script_dir)
+    lines = stderr.splitlines()
+    assert lines == [
+        "whole-program/configs_unused.c:3:9: style: struct member 'X::x' is never used. [unusedStructMember]",
+        "whole-program/configs_unused.c:2:1: style: misra violation (use --rule-texts=<file> to get proper output) [misra-c2012-2.3]",
+    ]
+    assert stdout == ''
+    assert ret == 1, stdout
+
+@pytest.mark.xfail(strict=True)
+def test_unused_with_project_A_and_B(tmpdir):
+    # A and B config
+    configs_unused_file = os.path.join(__script_dir, 'whole-program', 'configs_unused.c')
+    compile_db = __create_compile_commands(tmpdir, [configs_unused_file],
+        [["A", "B"]]
+    )
+    args = [
+        '-q',
+        '--addon=misra',
+        '--template=simple',
+        '--enable=all',
+        '--error-exitcode=1',
+        '--project={}'.format(compile_db)
+    ]
+    ret, stdout, stderr = cppcheck(args, cwd=__script_dir)
+    lines = stderr.splitlines()
+    assert lines == [
+    ]
+    # assert stdout == ''
+    # assert ret == 0, stdout
+
+
+def test_unused_with_project_A_or_B(tmpdir):
+    # A or B configs
+    configs_unused_file = os.path.join(__script_dir, 'whole-program', 'configs_unused.c')
+    compile_db = __create_compile_commands(tmpdir, [configs_unused_file],
+        [["A"], ["B"]]
+    )
+    args = [
+        '-q',
+        '--addon=misra',
+        '--template=simple',
+        '--enable=all',
+        '--error-exitcode=1',
+        '--project={}'.format(compile_db)
+    ]
+    ret, stdout, stderr = cppcheck(args, cwd=__script_dir)
+    lines = stderr.splitlines()
+    assert lines == [
+    ]
+    assert stdout == ''
+    assert ret == 0, stdout
+
+@pytest.mark.xfail(strict=True)
+def test_unused_with_project_B_or_A(tmpdir):
+    # A or B configs
+    configs_unused_file = os.path.join(__script_dir, 'whole-program', 'configs_unused.c')
+    compile_db = __create_compile_commands(tmpdir, [configs_unused_file],
+        [["B"], ["A"]]
+    )
+    args = [
+        '-q',
+        '--addon=misra',
+        '--template=simple',
+        '--enable=all',
+        '--error-exitcode=1',
+        '--project={}'.format(compile_db)
+    ]
+    ret, stdout, stderr = cppcheck(args, cwd=__script_dir)
+    lines = stderr.splitlines()
+    assert lines == [
+    ]
+    assert stdout == ''
+    assert ret == 0, stdout