Features: Add cxx_lambdas.

Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst

@@ -57,6 +57,11 @@ The features known to this version of CMake are:
 
   .. _N2540: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm
 
+``cxx_lambdas``
+  Lambda functions, as defined in N2927_.
+
+  .. _N2927: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2927.pdf
+
 ``cxx_override``
   Override control ``override`` keyword, as defined in N2928_.
 

Modules/Compiler/GNU-CXX-FeatureTests.cmake

@@ -20,6 +20,7 @@ set(_cmake_feature_test_cxx_constexpr "${GNU46_CXX11}")
 # TODO: Should be supported by GNU 4.5
 set(GNU45_CXX11 "${_oldestSupported} && __cplusplus >= 201103L")
 set(_cmake_feature_test_cxx_explicit_conversions "${GNU45_CXX11}")
+set(_cmake_feature_test_cxx_lambdas "${GNU45_CXX11}")
 # TODO: Should be supported by GNU 4.4
 set(GNU44_CXX11 "${_oldestSupported} && __cplusplus >= 201103L")
 set(_cmake_feature_test_cxx_auto_type "${GNU44_CXX11}")

Source/cmMakefile.cxx

@@ -51,6 +51,7 @@
   F(cxx_explicit_conversions) \
   F(cxx_final) \
   F(cxx_inheriting_constructors) \
+  F(cxx_lambdas) \
   F(cxx_override) \
   F(cxx_static_assert) \
   F(cxx_strong_enums) \

Tests/CompileFeatures/cxx_lambdas.cpp

@@ -0,0 +1,5 @@
+
+void someFunc()
+{
+  [](){}();
+}