Features: Record for AppleClang 5.1

Apple's Clang 5.1 already supports most of the C and C++ features CMake
enumerates.

Modules/Compiler/AppleClang-C-FeatureTests.cmake

@@ -0,0 +1,11 @@
+
+set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 501")
+
+set(AppleClang_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")
+set(_cmake_feature_test_c_static_assert "${AppleClang_C11}")
+set(AppleClang_C99 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
+set(_cmake_feature_test_c_restrict "${AppleClang_C99}")
+set(_cmake_feature_test_c_variadic_macros "${AppleClang_C99}")
+
+set(AppleClang_C90 "${_cmake_oldestSupported} && !defined(__STDC_VERSION__)")
+set(_cmake_feature_test_c_function_prototypes "${AppleClang_C90}")

Modules/Compiler/AppleClang-C.cmake

@@ -1,2 +1,33 @@
 include(Compiler/Clang)
 __compiler_clang(C)
+
+if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.1)
+  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 99)
+
+macro(cmake_record_c_compile_features)
+  macro(_get_appleclang_features std_version list)
+    record_compiler_features(C "${std_version}" ${list})
+  endmacro()
+
+  if (UNIX AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.1)
+    _get_appleclang_features(${CMAKE_C11_STANDARD_COMPILE_OPTION} CMAKE_C11_COMPILE_FEATURES)
+    if (_result EQUAL 0)
+      _get_appleclang_features(${CMAKE_C99_STANDARD_COMPILE_OPTION} CMAKE_C99_COMPILE_FEATURES)
+    endif()
+    if (_result EQUAL 0)
+      _get_appleclang_features(${CMAKE_C90_STANDARD_COMPILE_OPTION} CMAKE_C90_COMPILE_FEATURES)
+    endif()
+  else()
+    set(_result 0)
+  endif()
+endmacro()

Modules/Compiler/AppleClang-CXX-FeatureTests.cmake

@@ -0,0 +1,31 @@
+
+# No known reference for AppleClang versions.
+# Generic reference: http://clang.llvm.org/cxx_status.html
+# http://clang.llvm.org/docs/LanguageExtensions.html
+
+set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 501")
+
+include("${CMAKE_CURRENT_LIST_DIR}/Clang-CXX-TestableFeatures.cmake")
+
+set(AppleClang51_CXX14 "((__clang_major__ * 100) + __clang_minor__) >= 501 && __cplusplus > 201103L")
+# http://llvm.org/bugs/show_bug.cgi?id=19242
+set(_cmake_feature_test_cxx_attribute_deprecated "${AppleClang51_CXX14}")
+# http://llvm.org/bugs/show_bug.cgi?id=19698
+set(_cmake_feature_test_cxx_decltype_auto "${AppleClang51_CXX14}")
+set(_cmake_feature_test_cxx_digit_separators "${AppleClang51_CXX14}")
+# http://llvm.org/bugs/show_bug.cgi?id=19674
+set(_cmake_feature_test_cxx_generic_lambdas "${AppleClang51_CXX14}")
+
+set(AppleClang51_CXX11 "${_cmake_oldestSupported} && __cplusplus >= 201103L")
+set(_cmake_feature_test_cxx_enum_forward_declarations "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_sizeof_member "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_extended_friend_declarations "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_extern_templates "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_func_identifier "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_inline_namespaces "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_long_long_type "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_right_angle_brackets "${AppleClang51_CXX11}")
+set(_cmake_feature_test_cxx_variadic_macros "${AppleClang51_CXX11}")
+
+set(AppleClang_CXX98 "${_cmake_oldestSupported} && __cplusplus >= 199711L")
+set(_cmake_feature_test_cxx_template_template_parameters "${AppleClang_CXX98}")

Modules/Compiler/AppleClang-CXX.cmake

@@ -4,3 +4,34 @@ __compiler_clang(CXX)
 if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
   set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
 endif()
+
+if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
+  set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-std=c++98")
+  set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
+
+  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++11")
+  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
+
+  set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std=c++1y")
+  set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
+endif()
+
+set(CMAKE_CXX_STANDARD_DEFAULT 98)
+
+macro(cmake_record_cxx_compile_features)
+  macro(_get_appleclang_features std_version list)
+    record_compiler_features(CXX "${std_version}" ${list})
+  endmacro()
+
+  if (UNIX AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
+    _get_appleclang_features(${CMAKE_CXX14_STANDARD_COMPILE_OPTION} CMAKE_CXX14_COMPILE_FEATURES)
+    if (_result EQUAL 0)
+      _get_appleclang_features(${CMAKE_CXX11_STANDARD_COMPILE_OPTION} CMAKE_CXX11_COMPILE_FEATURES)
+    endif()
+    if (_result EQUAL 0)
+      _get_appleclang_features(${CMAKE_CXX98_STANDARD_COMPILE_OPTION} CMAKE_CXX98_COMPILE_FEATURES)
+    endif()
+  else()
+    set(_result 0)
+  endif()
+endmacro()

Modules/WriteCompilerDetectionHeader.cmake

@@ -100,7 +100,7 @@
 #    write_compiler_detection_header(
 #      FILE climbingstats_compiler_detection.h
 #      PREFIX ClimbingStats
-#      COMPILERS GNU Clang
+#      COMPILERS GNU Clang AppleClang
 #      FEATURES cxx_variadic_templates
 #    )
 #
@@ -315,6 +315,7 @@ function(write_compiler_detection_header
   set(compilers
     GNU
     Clang
+    AppleClang
   )
 
   set(_hex_compilers ADSP Borland Embarcadero SunPro)
@@ -513,7 +514,7 @@ function(write_compiler_detection_header
         set(file_content "${file_content}
 #  if ${def_name}
 #    define ${def_value} alignas(X)
-#  elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang
+#  elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang || ${prefix_arg}_COMPILER_IS_AppleClang
 #    define ${def_value} __attribute__ ((__aligned__(X)))
 #  else
 #    define ${def_value}
@@ -525,7 +526,7 @@ function(write_compiler_detection_header
         set(file_content "${file_content}
 #  if ${def_name}
 #    define ${def_value} alignof(X)
-#  elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang
+#  elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang || ${prefix_arg}_COMPILER_IS_AppleClang
 #    define ${def_value} __alignof__(X)
 #  endif
 \n")

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 Clang
+  COMPILERS GNU Clang AppleClang
   VERSION 3.1
   PROLOG "// something"
   EPILOG "// more"
@@ -57,14 +57,16 @@ macro(set_defines target true_defs false_defs)
 endmacro()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL GNU
-    OR CMAKE_CXX_COMPILER_ID STREQUAL Clang)
+    OR CMAKE_CXX_COMPILER_ID STREQUAL Clang
+    OR CMAKE_CXX_COMPILER_ID STREQUAL AppleClang)
   # False for C++98 mode.
   list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
   list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
 endif()
 
 if (CMAKE_C_COMPILER_ID STREQUAL GNU
-    OR CMAKE_C_COMPILER_ID STREQUAL Clang)
+    OR CMAKE_C_COMPILER_ID STREQUAL Clang
+    OR CMAKE_C_COMPILER_ID STREQUAL AppleClang)
   add_executable(C_undefined c_undefined.c)
   set_property(TARGET C_undefined PROPERTY CXX_STANDARD 90)
   target_compile_options(C_undefined PRIVATE -Werror=undef)
@@ -79,7 +81,7 @@ write_compiler_detection_header(
   PREFIX MULTI
   OUTPUT_FILES_VAR multi_files
   OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files/compiler_support"
-  COMPILERS GNU Clang
+  COMPILERS GNU Clang AppleClang
   VERSION 3.1
   FEATURES
     ${cxx_known_features} ${c_known_features}