Apple: Introduce separate system name for iOS, tvOS, and watchOS

- Remove code signing requirements for non-macOS
- Do not set deployment target for non-macOS
- Build static library for compiler feature detection for non-macOS
- Use framework to run CompilerId tests for watchOS
- Port tests to new SDK handling
- Add new Apple cross-compiling section to toolchain documentation

Closes: #17870

7 files changed, 38 insertions, 64 deletions

diff --git a/Tests/RunCMake/XcodeProject/DeploymentTarget.cmake b/Tests/RunCMake/XcodeProject/DeploymentTarget.cmake
index 6281352..288735e 100644
--- a/Tests/RunCMake/XcodeProject/DeploymentTarget.cmake
+++ b/Tests/RunCMake/XcodeProject/DeploymentTarget.cmake
@@ -3,28 +3,21 @@ project(DeploymentTarget C)
 
 # using Xcode 7.1 SDK versions for deployment targets
 
-if(SDK MATCHES iphone)
-  set(CMAKE_OSX_SYSROOT ${SDK})
-  set(CMAKE_OSX_ARCHITECTURES "armv7;x86_64")
+if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
   set(CMAKE_OSX_DEPLOYMENT_TARGET "9.1")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
   set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "NO")
-elseif(SDK MATCHES watch)
-  set(CMAKE_OSX_SYSROOT ${SDK})
-  set(CMAKE_OSX_ARCHITECTURES "armv7k;i386")
+elseif(CMAKE_SYSTEM_NAME STREQUAL "watchOS")
   set(CMAKE_OSX_DEPLOYMENT_TARGET "2.0")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
   set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "YES")
-elseif(SDK MATCHES appletv)
-  set(CMAKE_OSX_SYSROOT ${SDK})
+elseif(CMAKE_SYSTEM_NAME STREQUAL "tvOS")
   set(CMAKE_OSX_DEPLOYMENT_TARGET "9.0")
-  set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
   set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "YES")
 else()
-  set(CMAKE_OSX_SYSROOT ${SDK})
   set(CMAKE_OSX_DEPLOYMENT_TARGET "10.11")
 endif()
 
diff --git a/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake b/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake
index 6ea0c0c..4918f7c 100644
--- a/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake
+++ b/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake
@@ -1,9 +1,5 @@
 include(RunCMake)
 
-if(XCODE_VERSION VERSION_GREATER_EQUAL 9)
-  set(IOS_DEPLOYMENT_TARGET "-DCMAKE_XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET=10")
-endif()
-
 run_cmake(ExplicitCMakeLists)
 
 run_cmake(XcodeFileType)
@@ -65,8 +61,8 @@ if(NOT XCODE_VERSION VERSION_LESS 5)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeInstallIOS-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_BINARY_DIR}/ios_install"
-    "${IOS_DEPLOYMENT_TARGET}")
+    "-DCMAKE_SYSTEM_NAME=iOS"
+    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_BINARY_DIR}/ios_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
@@ -81,7 +77,7 @@ if(NOT XCODE_VERSION VERSION_LESS 5)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeBundlesOSX-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DTEST_IOS=OFF"
+    "-DCMAKE_SYSTEM_NAME=Darwin"
     "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
@@ -98,9 +94,8 @@ if(NOT XCODE_VERSION VERSION_LESS 5)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeBundlesIOS-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DTEST_IOS=ON"
-    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install"
-    "${IOS_DEPLOYMENT_TARGET}")
+    "-DCMAKE_SYSTEM_NAME=iOS"
+    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
@@ -118,7 +113,7 @@ if(NOT XCODE_VERSION VERSION_LESS 7)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeBundlesWatchOS-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DTEST_WATCHOS=ON"
+    "-DCMAKE_SYSTEM_NAME=watchOS"
     "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
@@ -137,7 +132,7 @@ if(NOT XCODE_VERSION VERSION_LESS 7.1)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeBundlesTvOS-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DTEST_TVOS=ON"
+    "-DCMAKE_SYSTEM_NAME=tvOS"
     "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
@@ -163,9 +158,9 @@ if(NOT XCODE_VERSION VERSION_LESS 6)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeIOSInstallCombined-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install"
+    "-DCMAKE_SYSTEM_NAME=iOS"
     "-DCMAKE_IOS_INSTALL_COMBINED=YES"
-    "${IOS_DEPLOYMENT_TARGET}")
+    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
@@ -182,9 +177,9 @@ if(NOT XCODE_VERSION VERSION_LESS 6)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeIOSInstallCombinedPrune-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install"
+    "-DCMAKE_SYSTEM_NAME=iOS"
     "-DCMAKE_IOS_INSTALL_COMBINED=YES"
-    "${IOS_DEPLOYMENT_TARGET}")
+    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
@@ -201,9 +196,9 @@ if(NOT XCODE_VERSION VERSION_LESS 6)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeIOSInstallCombinedSingleArch-build)
   set(RunCMake_TEST_NO_CLEAN 1)
   set(RunCMake_TEST_OPTIONS
-    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install"
+    "-DCMAKE_SYSTEM_NAME=iOS"
     "-DCMAKE_IOS_INSTALL_COMBINED=YES"
-    "${IOS_DEPLOYMENT_TARGET}")
+    "-DCMAKE_INSTALL_PREFIX:PATH=${RunCMake_TEST_BINARY_DIR}/_install")
 
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
@@ -240,10 +235,10 @@ if(NOT XCODE_VERSION VERSION_LESS 5)
 endif()
 
 if(XCODE_VERSION VERSION_GREATER_EQUAL 8)
-  function(deploymeny_target_test SDK)
+  function(deployment_target_test SystemName SDK)
     set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/DeploymentTarget-${SDK}-build)
     set(RunCMake_TEST_NO_CLEAN 1)
-    set(RunCMake_TEST_OPTIONS "-DSDK=${SDK}")
+    set(RunCMake_TEST_OPTIONS "-DCMAKE_SYSTEM_NAME=${SystemName}" "-DCMAKE_OSX_SYSROOT=${SDK}")
 
     file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
     file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
@@ -252,9 +247,13 @@ if(XCODE_VERSION VERSION_GREATER_EQUAL 8)
     run_cmake_command(DeploymentTarget-${SDK} ${CMAKE_COMMAND} --build .)
   endfunction()
 
-  foreach(SDK macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator)
-    deploymeny_target_test(${SDK})
-  endforeach()
+  deployment_target_test(Darwin macosx)
+  deployment_target_test(iOS iphoneos)
+  deployment_target_test(iOS iphonesimulator)
+  deployment_target_test(tvOS appletvos)
+  deployment_target_test(tvOS appletvsimulator)
+  deployment_target_test(watchOS watchos)
+  deployment_target_test(watchOS watchsimulator)
 endif()
 
 # Please add macOS-only tests above before the device-specific tests.
diff --git a/Tests/RunCMake/XcodeProject/XcodeBundles.cmake b/Tests/RunCMake/XcodeProject/XcodeBundles.cmake
index 5d19ee8..ef772ea 100644
--- a/Tests/RunCMake/XcodeProject/XcodeBundles.cmake
+++ b/Tests/RunCMake/XcodeProject/XcodeBundles.cmake
@@ -3,27 +3,12 @@
 cmake_minimum_required(VERSION 3.3)
 enable_language(C)
 
-# due to lack of toolchain file it might point to running macOS version
-unset(CMAKE_OSX_DEPLOYMENT_TARGET CACHE)
-
-if(TEST_IOS)
-  set(CMAKE_OSX_SYSROOT iphoneos)
-  set(CMAKE_OSX_ARCHITECTURES "armv7")
+if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
   set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "NO")
-endif(TEST_IOS)
-
-if(TEST_WATCHOS)
-  set(CMAKE_OSX_SYSROOT watchos)
-  set(CMAKE_OSX_ARCHITECTURES "armv7k")
-  set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
-  set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
-  set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "YES")
 endif()
 
-if(TEST_TVOS)
-  set(CMAKE_OSX_SYSROOT appletvos)
-  set(CMAKE_OSX_ARCHITECTURES "arm64")
+if(CMAKE_SYSTEM_NAME STREQUAL "tvOS" OR CMAKE_SYSTEM_NAME STREQUAL "watchOS")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
   set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
   set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "YES")
@@ -41,7 +26,7 @@ add_dependencies(AppBundleTest AppBundle)
 
 # with custom extension
 
-if (NOT TEST_IOS AND NOT TEST_WATCHOS AND NOT TEST_TVOS)
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   add_executable(AppBundleExt MACOSX_BUNDLE main.m)
   set_target_properties(AppBundleExt PROPERTIES BUNDLE_EXTENSION "foo")
   install(TARGETS AppBundleExt BUNDLE DESTINATION FooExtension)
@@ -55,7 +40,7 @@ endif()
 
 # Shared Framework (not supported for iOS on Xcode < 6)
 
-if(NOT TEST_IOS OR NOT XCODE_VERSION VERSION_LESS 6)
+if(NOT CMAKE_SYSTEM_NAME STREQUAL "iOS" OR NOT XCODE_VERSION VERSION_LESS 6)
   add_library(SharedFramework SHARED main.c)
   set_target_properties(SharedFramework PROPERTIES FRAMEWORK TRUE)
 
diff --git a/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombined.cmake b/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombined.cmake
index d7f3920..7f31d94 100644
--- a/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombined.cmake
+++ b/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombined.cmake
@@ -2,10 +2,10 @@ cmake_minimum_required(VERSION 3.3)
 
 project(IOSInstallCombined CXX)
 
-# due to lack of toolchain file it might point to running macOS version
-unset(CMAKE_OSX_DEPLOYMENT_TARGET CACHE)
+if(XCODE_VERSION VERSION_GREATER_EQUAL 9)
+  set(CMAKE_OSX_DEPLOYMENT_TARGET 10)
+endif()
 
-set(CMAKE_OSX_SYSROOT iphoneos)
 set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
 set(CMAKE_XCODE_ATTRIBUTE_DEBUG_INFORMATION_FORMAT "dwarf")
 set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "NO")
diff --git a/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedPrune.cmake b/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedPrune.cmake
index 28ab883..ec11dbb 100644
--- a/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedPrune.cmake
+++ b/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedPrune.cmake
@@ -2,10 +2,10 @@ cmake_minimum_required(VERSION 3.3)
 
 project(XcodeIOSInstallCombinedPrune CXX)
 
-# due to lack of toolchain file it might point to running macOS version
-unset(CMAKE_OSX_DEPLOYMENT_TARGET CACHE)
+if(XCODE_VERSION VERSION_GREATER_EQUAL 9)
+  set(CMAKE_OSX_DEPLOYMENT_TARGET 10)
+endif()
 
-set(CMAKE_OSX_SYSROOT iphoneos)
 set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
 set(CMAKE_XCODE_ATTRIBUTE_DEBUG_INFORMATION_FORMAT "dwarf")
 
diff --git a/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedSingleArch.cmake b/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedSingleArch.cmake
index 5e7961a..58e96b4 100644
--- a/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedSingleArch.cmake
+++ b/Tests/RunCMake/XcodeProject/XcodeIOSInstallCombinedSingleArch.cmake
@@ -2,10 +2,10 @@ cmake_minimum_required(VERSION 3.3)
 
 project(XcodeIOSInstallCombinedSingleArch CXX)
 
-# due to lack of toolchain file it might point to running macOS version
-unset(CMAKE_OSX_DEPLOYMENT_TARGET CACHE)
+if(XCODE_VERSION VERSION_GREATER_EQUAL 9)
+  set(CMAKE_OSX_DEPLOYMENT_TARGET 10)
+endif()
 
-set(CMAKE_OSX_SYSROOT iphoneos)
 set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
 set(CMAKE_XCODE_ATTRIBUTE_DEBUG_INFORMATION_FORMAT "dwarf")
 
diff --git a/Tests/RunCMake/XcodeProject/XcodeInstallIOS.cmake b/Tests/RunCMake/XcodeProject/XcodeInstallIOS.cmake
index a797410..ab31387 100644
--- a/Tests/RunCMake/XcodeProject/XcodeInstallIOS.cmake
+++ b/Tests/RunCMake/XcodeProject/XcodeInstallIOS.cmake
@@ -2,11 +2,8 @@ cmake_minimum_required(VERSION 2.8.5)
 
 project(XcodeInstallIOS)
 
-set(CMAKE_OSX_SYSROOT iphoneos)
 set(XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
 set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "NO")
 
-set(CMAKE_OSX_ARCHITECTURES "armv7;i386")
-
 add_library(foo STATIC foo.cpp)
 install(TARGETS foo ARCHIVE DESTINATION lib)