[analyzer] Add --force-analyze-debug-code option to scan-build

to force debug build and hopefully enable more precise warnings.

Static Analyzer is much more efficient when built in debug mode
(-UNDEBUG) so we advice users to enable it manually. This may be
inconvenient in case of large complex projects (think about Linux
distros e.g. Android or Tizen). This patch adds a flag to scan-build
which inserts -UNDEBUG automatically.

Differential Revision: http://reviews.llvm.org/D16200

llvm-svn: 261204

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/tools/scan-build-py/tests/unit/test_runner.py b/clang/tools/scan-build-py/tests/unit/test_runner.py
index ea10051d850..de15d236920 100644
--- a/clang/tools/scan-build-py/tests/unit/test_runner.py
+++ b/clang/tools/scan-build-py/tests/unit/test_runner.py
@@ -211,3 +211,14 @@ class RequireDecoratorTest(unittest.TestCase):
 
     def test_method_exception_not_caught(self):
         self.assertRaises(Exception, method_exception_from_inside, dict())
+
+class ForceAnalyzeDebugTest(unittest.TestCase):
+
+    def test_force_analyze_debug_code(self):
+        for a, b in [
+                ([], ['-UNDEBUG']),
+                (['-O2'], ['-O2', '-UNDEBUG']),
+                (['-Dkey=val'], ['-Dkey=val', '-UNDEBUG']),
+                (['-D', 'NDEBUG'], ['-D', 'NDEBUG', '-UNDEBUG']) ]:
+            sut.force_analyze_debug_code(a)
+            self.assertEqual(a, b)