Merge topic 'objective-c-cxx'

dd0f304613 Objective C/C++: Add compiler standard detection
b515af782b Help: Add release note for Objective-C/C++ language support
9e66397c28 Languages: Add support for Objective-C++
80f120a85f Languages: Add support for Objective-C

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3811

6 files changed, 158 insertions, 0 deletions

diff --git a/Modules/Compiler/AppleClang-OBJC.cmake b/Modules/Compiler/AppleClang-OBJC.cmake
new file mode 100644
index 0000000..d1f3706
--- /dev/null
+++ b/Modules/Compiler/AppleClang-OBJC.cmake
@@ -0,0 +1,17 @@
+include(Compiler/Clang-OBJC)
+
+if(NOT CMAKE_OBJC_COMPILER_VERSION VERSION_LESS 4.0)
+  set(CMAKE_OBJC90_STANDARD_COMPILE_OPTION "-std=c90")
+  set(CMAKE_OBJC90_EXTENSION_COMPILE_OPTION "-std=gnu90")
+  set(CMAKE_OBJC90_STANDARD__HAS_FULL_SUPPORT ON)
+
+  set(CMAKE_OBJC99_STANDARD_COMPILE_OPTION "-std=c99")
+  set(CMAKE_OBJC99_EXTENSION_COMPILE_OPTION "-std=gnu99")
+  set(CMAKE_OBJC99_STANDARD__HAS_FULL_SUPPORT ON)
+
+  set(CMAKE_OBJC11_STANDARD_COMPILE_OPTION "-std=c11")
+  set(CMAKE_OBJC11_EXTENSION_COMPILE_OPTION "-std=gnu11")
+  set(CMAKE_OBJC11_STANDARD__HAS_FULL_SUPPORT ON)
+endif()
+
+__compiler_check_default_language_standard(OBJC 4.0 99)
diff --git a/Modules/Compiler/AppleClang-OBJCXX.cmake b/Modules/Compiler/AppleClang-OBJCXX.cmake
new file mode 100644
index 0000000..7c6f763
--- /dev/null
+++ b/Modules/Compiler/AppleClang-OBJCXX.cmake
@@ -0,0 +1,37 @@
+include(Compiler/Clang-OBJCXX)
+
+if(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 4.0)
+  set(CMAKE_OBJCXX98_STANDARD_COMPILE_OPTION "-std=c++98")
+  set(CMAKE_OBJCXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
+  set(CMAKE_OBJCXX98_STANDARD__HAS_FULL_SUPPORT ON)
+
+  set(CMAKE_OBJCXX11_STANDARD_COMPILE_OPTION "-std=c++11")
+  set(CMAKE_OBJCXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
+endif()
+
+if(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 6.1)
+  set(CMAKE_OBJCXX14_STANDARD_COMPILE_OPTION "-std=c++14")
+  set(CMAKE_OBJCXX14_EXTENSION_COMPILE_OPTION "-std=gnu++14")
+  set(CMAKE_OBJCXX14_STANDARD__HAS_FULL_SUPPORT ON)
+elseif(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 5.1)
+  # AppleClang 5.0 knows this flag, but does not set a __cplusplus macro greater than 201103L
+  set(CMAKE_OBJCXX14_STANDARD_COMPILE_OPTION "-std=c++1y")
+  set(CMAKE_OBJCXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
+  set(CMAKE_OBJCXX14_STANDARD__HAS_FULL_SUPPORT ON)
+endif()
+
+if (NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 6.1)
+  set(CMAKE_OBJCXX17_STANDARD_COMPILE_OPTION "-std=c++1z")
+  set(CMAKE_OBJCXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
+endif()
+
+if (NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 8.0)
+    set(CMAKE_OBJCXX11_STANDARD__HAS_FULL_SUPPORT ON)
+endif()
+
+if (NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 10.0)
+  set(CMAKE_OBJCXX20_STANDARD_COMPILE_OPTION "-std=c++2a")
+  set(CMAKE_OBJCXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
+endif()
+
+__compiler_check_default_language_standard(OBJCXX 4.0 98)
diff --git a/Modules/Compiler/Clang-OBJC.cmake b/Modules/Compiler/Clang-OBJC.cmake
new file mode 100644
index 0000000..c61c497
--- /dev/null
+++ b/Modules/Compiler/Clang-OBJC.cmake
@@ -0,0 +1,18 @@
+include(Compiler/Clang)
+__compiler_clang(OBJC)
+
+if(NOT CMAKE_OBJC_COMPILER_VERSION VERSION_LESS 3.4)
+  set(CMAKE_OBJC90_STANDARD_COMPILE_OPTION "-std=c90")
+  set(CMAKE_OBJC90_EXTENSION_COMPILE_OPTION "-std=gnu90")
+  set(CMAKE_OBJC90_STANDARD__HAS_FULL_SUPPORT ON)
+
+  set(CMAKE_OBJC99_STANDARD_COMPILE_OPTION "-std=c99")
+  set(CMAKE_OBJC99_EXTENSION_COMPILE_OPTION "-std=gnu99")
+  set(CMAKE_OBJC99_STANDARD__HAS_FULL_SUPPORT ON)
+
+  set(CMAKE_OBJC11_STANDARD_COMPILE_OPTION "-std=c11")
+  set(CMAKE_OBJC11_EXTENSION_COMPILE_OPTION "-std=gnu11")
+  set(CMAKE_OBJC11_STANDARD__HAS_FULL_SUPPORT ON)
+endif()
+
+__compiler_check_default_language_standard(OBJC 3.4 99 3.6 11)
diff --git a/Modules/Compiler/Clang-OBJCXX.cmake b/Modules/Compiler/Clang-OBJCXX.cmake
new file mode 100644
index 0000000..b01ce64
--- /dev/null
+++ b/Modules/Compiler/Clang-OBJCXX.cmake
@@ -0,0 +1,70 @@
+include(Compiler/Clang)
+__compiler_clang(OBJCXX)
+
+if("x${CMAKE_OBJCXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
+  if(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 2.1)
+    set(CMAKE_OBJCXX98_STANDARD_COMPILE_OPTION "-std=c++98")
+    set(CMAKE_OBJCXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
+  endif()
+
+  if(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 3.1)
+    set(CMAKE_OBJCXX98_STANDARD__HAS_FULL_SUPPORT ON)
+    set(CMAKE_OBJCXX11_STANDARD_COMPILE_OPTION "-std=c++11")
+    set(CMAKE_OBJCXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
+    set(CMAKE_OBJCXX11_STANDARD__HAS_FULL_SUPPORT ON)
+  elseif(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 2.1)
+    set(CMAKE_OBJCXX11_STANDARD_COMPILE_OPTION "-std=c++0x")
+    set(CMAKE_OBJCXX11_EXTENSION_COMPILE_OPTION "-std=gnu++0x")
+  endif()
+
+  if(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 3.5)
+    set(CMAKE_OBJCXX14_STANDARD_COMPILE_OPTION "-std=c++14")
+    set(CMAKE_OBJCXX14_EXTENSION_COMPILE_OPTION "-std=gnu++14")
+    set(CMAKE_OBJCXX14_STANDARD__HAS_FULL_SUPPORT ON)
+  elseif(NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 3.4)
+    set(CMAKE_OBJCXX14_STANDARD_COMPILE_OPTION "-std=c++1y")
+    set(CMAKE_OBJCXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
+    set(CMAKE_OBJCXX14_STANDARD__HAS_FULL_SUPPORT ON)
+  endif()
+
+  set(_clang_version_std17 5.0)
+
+  if (NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS "${_clang_version_std17}")
+    set(CMAKE_OBJCXX17_STANDARD_COMPILE_OPTION "-std=c++17")
+    set(CMAKE_OBJCXX17_EXTENSION_COMPILE_OPTION "-std=gnu++17")
+  elseif (NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS 3.5)
+    set(CMAKE_OBJCXX17_STANDARD_COMPILE_OPTION "-std=c++1z")
+    set(CMAKE_OBJCXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
+  endif()
+
+  if (NOT CMAKE_OBJCXX_COMPILER_VERSION VERSION_LESS "${_clang_version_std17}")
+    set(CMAKE_OBJCXX20_STANDARD_COMPILE_OPTION "-std=c++2a")
+    set(CMAKE_OBJCXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
+  endif()
+
+  unset(_clang_version_std17)
+
+  __compiler_check_default_language_standard(OBJCXX 2.1 98)
+elseif(CMAKE_OBJCXX_COMPILER_VERSION VERSION_GREATER_EQUAL 3.9
+    AND CMAKE_OBJCXX_SIMULATE_VERSION VERSION_GREATER_EQUAL 19.0)
+  # This version of clang-cl and the MSVC version it simulates have
+  # support for -std: flags.
+  set(CMAKE_OBJCXX98_STANDARD_COMPILE_OPTION "")
+  set(CMAKE_OBJCXX98_EXTENSION_COMPILE_OPTION "")
+  set(CMAKE_OBJCXX98_STANDARD__HAS_FULL_SUPPORT ON)
+  set(CMAKE_OBJCXX11_STANDARD_COMPILE_OPTION "")
+  set(CMAKE_OBJCXX11_EXTENSION_COMPILE_OPTION "")
+  set(CMAKE_OBJCXX14_STANDARD_COMPILE_OPTION "-std:c++14")
+  set(CMAKE_OBJCXX14_EXTENSION_COMPILE_OPTION "-std:c++14")
+  if (CMAKE_OBJCXX_COMPILER_VERSION VERSION_GREATER_EQUAL 6.0)
+    set(CMAKE_OBJCXX17_STANDARD_COMPILE_OPTION "-std:c++17")
+    set(CMAKE_OBJCXX17_EXTENSION_COMPILE_OPTION "-std:c++17")
+    set(CMAKE_OBJCXX20_STANDARD_COMPILE_OPTION "-std:c++latest")
+    set(CMAKE_OBJCXX20_EXTENSION_COMPILE_OPTION "-std:c++latest")
+  else()
+    set(CMAKE_OBJCXX17_STANDARD_COMPILE_OPTION "-std:c++latest")
+    set(CMAKE_OBJCXX17_EXTENSION_COMPILE_OPTION "-std:c++latest")
+  endif()
+
+  __compiler_check_default_language_standard(OBJCXX 3.9 14)
+endif()
diff --git a/Modules/Compiler/GNU-OBJC.cmake b/Modules/Compiler/GNU-OBJC.cmake
new file mode 100644
index 0000000..5fba801
--- /dev/null
+++ b/Modules/Compiler/GNU-OBJC.cmake
@@ -0,0 +1,6 @@
+include(Compiler/GNU)
+__compiler_gnu(OBJC)
+
+if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.2)
+  set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
+endif()
diff --git a/Modules/Compiler/GNU-OBJCXX.cmake b/Modules/Compiler/GNU-OBJCXX.cmake
new file mode 100644
index 0000000..66a547e
--- /dev/null
+++ b/Modules/Compiler/GNU-OBJCXX.cmake
@@ -0,0 +1,10 @@
+include(Compiler/GNU)
+__compiler_gnu(OBJC)
+
+if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.2)
+  set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
+endif()
+
+if(NOT CMAKE_OBJCXX_LINK_FLAGS)
+  set(CMAKE_OBCXX_LINK_FLAGS "-lstdc++")
+endif()