Features: Record for Clang 3.4

Clang 3.4 supports all features currently known to CMake.

Modules/Compiler/Clang-C-FeatureTests.cmake

@@ -0,0 +1,11 @@
+
+set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 304")
+
+set(Clang_C11 "${_cmake_oldestSupported} && __STDC_VERSION__ >= 201112L")
+set(_cmake_feature_test_c_static_assert "${Clang_C11}")
+set(Clang_C99 "${_cmake_oldestSupported} && __STDC_VERSION__ >= 199901L")
+set(_cmake_feature_test_c_restrict "${Clang_C99}")
+set(_cmake_feature_test_c_variadic_macros "${Clang_C99}")
+
+set(Clang_C90 "${_cmake_oldestSupported} && !defined(__STDC_VERSION__)")
+set(_cmake_feature_test_c_function_prototypes "${Clang_C90}")

Modules/Compiler/Clang-C.cmake

@@ -1,2 +1,38 @@
 include(Compiler/Clang)
 __compiler_clang(C)
+
+cmake_policy(GET CMP0025 appleClangPolicy)
+if(WIN32 OR (APPLE AND NOT appleClangPolicy STREQUAL NEW))
+  return()
+endif()
+
+if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.4)
+  set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
+  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
+
+  set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
+  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
+
+  set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
+  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
+endif()
+
+set(CMAKE_C_STANDARD_DEFAULT 90)
+
+macro(cmake_record_c_compile_features)
+  macro(_get_clang_features std_version list)
+    record_compiler_features(C "-std=${std_version}" ${list})
+  endmacro()
+
+  if (UNIX AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.4)
+    _get_clang_features(c11 CMAKE_C11_COMPILE_FEATURES)
+    if (_result EQUAL 0)
+      _get_clang_features(c99 CMAKE_C99_COMPILE_FEATURES)
+    endif()
+    if (_result EQUAL 0)
+      _get_clang_features(c90 CMAKE_C90_COMPILE_FEATURES)
+    endif()
+  else()
+    set(_result 0)
+  endif()
+endmacro()

Modules/Compiler/Clang-CXX-FeatureTests.cmake

@@ -0,0 +1,69 @@
+
+# Reference: http://clang.llvm.org/cxx_status.html
+# http://clang.llvm.org/docs/LanguageExtensions.html
+
+set(testable_features
+  cxx_alias_templates
+  cxx_alignas
+  cxx_attributes
+  cxx_auto_type
+  cxx_constexpr
+  cxx_decltype
+  cxx_decltype_incomplete_return_types
+  cxx_default_function_template_args
+  cxx_defaulted_functions
+  cxx_delegating_constructors
+  cxx_deleted_functions
+  cxx_explicit_conversions
+  cxx_generalized_initializers
+  cxx_inheriting_constructors
+  cxx_lambdas
+  cxx_local_type_template_args
+  cxx_noexcept
+  cxx_nonstatic_member_init
+  cxx_nullptr
+  cxx_range_for
+  cxx_raw_string_literals
+  cxx_reference_qualified_functions
+  cxx_rvalue_references
+  cxx_static_assert
+  cxx_strong_enums
+  cxx_thread_local
+  cxx_unicode_literals
+  cxx_unrestricted_unions
+  cxx_user_literals
+  cxx_variadic_templates
+)
+
+set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 304")
+
+foreach(feature ${testable_features})
+  set(_cmake_feature_test_${feature} "${_cmake_oldestSupported} && __has_feature(${feature})")
+endforeach()
+
+unset(testable_features)
+
+set(_cmake_feature_test_cxx_trailing_return_types "${_cmake_oldestSupported} && __has_feature(cxx_trailing_return)")
+set(_cmake_feature_test_cxx_alignof "${_cmake_oldestSupported} && __has_feature(cxx_alignas)")
+set(_cmake_feature_test_cxx_final "${_cmake_oldestSupported} && __has_feature(cxx_override_control)")
+set(_cmake_feature_test_cxx_override "${_cmake_oldestSupported} && __has_feature(cxx_override_control)")
+set(_cmake_feature_test_cxx_uniform_initialization "${_cmake_oldestSupported} && __has_feature(cxx_generalized_initializers)")
+set(_cmake_feature_test_cxx_defaulted_move_initializers "${_cmake_oldestSupported} && __has_feature(cxx_defaulted_functions)")
+
+# TODO: Should be supported by Clang 3.1
+set(Clang31_CXX11 "${_cmake_oldestSupported} && __cplusplus >= 201103L")
+set(_cmake_feature_test_cxx_enum_forward_declarations "${Clang31_CXX11}")
+set(_cmake_feature_test_cxx_sizeof_member "${Clang31_CXX11}")
+# TODO: Should be supported by Clang 2.9
+set(Clang29_CXX11 "${_cmake_oldestSupported} && __cplusplus >= 201103L")
+set(_cmake_feature_test_cxx_extended_friend_declarations "${Clang29_CXX11}")
+set(_cmake_feature_test_cxx_extern_templates "${Clang29_CXX11}")
+set(_cmake_feature_test_cxx_func_identifier "${Clang29_CXX11}")
+set(_cmake_feature_test_cxx_inline_namespaces "${Clang29_CXX11}")
+set(_cmake_feature_test_cxx_long_long_type "${Clang29_CXX11}")
+set(_cmake_feature_test_cxx_right_angle_brackets "${Clang29_CXX11}")
+set(_cmake_feature_test_cxx_variadic_macros "${Clang29_CXX11}")
+
+# TODO: Should be supported forever?
+set(Clang_CXX98 "${_cmake_oldestSupported} && __cplusplus >= 199711L")
+set(_cmake_feature_test_cxx_template_template_parameters "${Clang_CXX98}")

Modules/Compiler/Clang-CXX.cmake

@@ -6,7 +6,7 @@ if(NOT CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC")
 endif()
 
 cmake_policy(GET CMP0025 appleClangPolicy)
-if(APPLE AND NOT appleClangPolicy STREQUAL NEW)
+if(WIN32 OR (APPLE AND NOT appleClangPolicy STREQUAL NEW))
   return()
 endif()
 
@@ -22,3 +22,28 @@ elseif(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 2.1)
   set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++0x")
   set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++0x")
 endif()
+
+if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.4)
+  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++1y")
+  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
+endif()
+
+set(CMAKE_CXX_STANDARD_DEFAULT 98)
+
+macro(cmake_record_cxx_compile_features)
+  macro(_get_clang_features std_version list)
+    record_compiler_features(CXX "-std=${std_version}" ${list})
+  endmacro()
+
+  if (UNIX AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.4)
+    _get_clang_features(c++1y CMAKE_CXX14_COMPILE_FEATURES)
+    if (_result EQUAL 0)
+      _get_clang_features(c++11 CMAKE_CXX11_COMPILE_FEATURES)
+    endif()
+    if (_result EQUAL 0)
+      _get_clang_features(c++98 CMAKE_CXX98_COMPILE_FEATURES)
+    endif()
+  else()
+    set(_result 0)
+  endif()
+endmacro()

Modules/WriteCompilerDetectionHeader.cmake

@@ -200,6 +200,7 @@ function(write_compiler_detection_header
 
   set(compilers
     GNU
+    Clang
   )
   foreach(_comp ${_WCD_COMPILERS})
     list(FIND compilers ${_comp} idx)

Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt

@@ -11,7 +11,7 @@ get_property(c_known_features GLOBAL PROPERTY CMAKE_C_KNOWN_FEATURES)
 write_compiler_detection_header(
   FILE "${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h"
   PREFIX TEST
-  COMPILERS GNU
+  COMPILERS GNU Clang
   VERSION 3.1
   PROLOG "// something"
   EPILOG "// more"
@@ -49,7 +49,8 @@ macro(set_defines target true_defs false_defs)
   )
 endmacro()
 
-if (CMAKE_CXX_COMPILER_ID STREQUAL GNU)
+if (CMAKE_CXX_COMPILER_ID STREQUAL GNU
+    OR CMAKE_CXX_COMPILER_ID STREQUAL Clang)
   # False for C++98 mode.
   list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
   list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)