Check for lambda support before using it.

CMakeLists.txt

@@ -25,8 +25,15 @@ check_cxx_source_compiles(
      }
     "
     USE_STD_UNORDERED_MAP)
+check_cxx_source_compiles(
+    "int main() {
+       [](){}();
+     }
+    "
+    HAVE_LAMBDAS)
 unset(CMAKE_REQUIRED_FLAGS)
 
+
 if (UNIX AND NOT APPLE)
   set(LINUX 1)
 endif (UNIX AND NOT APPLE)

src/config.h.in

@@ -44,5 +44,6 @@
 #cmakedefine USE_INSTALL_PREFIX
 #cmakedefine USE_SYSTEM_PROJECTM
 #cmakedefine USE_STD_UNORDERED_MAP
+#cmakedefine HAVE_LAMBDAS
 
 #endif // CONFIG_H_IN

tests/closure_test.cpp

@@ -5,6 +5,7 @@
 #include <QSharedPointer>
 #include <QSignalSpy>
 
+#include "config.h"
 #include "core/closure.h"
 #include "test_utils.h"
 
@@ -63,6 +64,7 @@ TEST(ClosureTest, ClosureDoesNotCrashWithSharedPointerSender) {
   EXPECT_TRUE(closure.isNull());
 }
 
+#ifdef HAVE_LAMBDAS
 TEST(ClosureTest, ClosureCallsLambda) {
   TestQObject sender;
   bool called = false;
@@ -73,3 +75,4 @@ TEST(ClosureTest, ClosureCallsLambda) {
   sender.Emit();
   EXPECT_TRUE(called);
 }
+#endif  // HAVE_LAMBDAS