[CMake] Adding experimental support for tvOS and watchOS

[beanz]

Summary

• Refactored the iOS config-ix.cmake code to be a more compact loop over supported embedded platforms.
• Added watchOS and tvOS as experimental platforms, they don't currently build so they are disabled by default

[samsonov]

LGTM

cmake/config-ix.cmake

if(NOT EXISTS /usr/include)
     execute_process(COMMAND xcodebuild -version -sdk macosx Path
        OUTPUT_VARIABLE OSX_SYSROOT
        ERROR_QUIET
        OUTPUT_STRIP_TRAILING_WHITESPACE)
     set(OSX_SYSROOT_FLAG "-isysroot${OSX_SYSROOT}")
   endif()
 
   option(COMPILER_RT_ENABLE_IOS "Enable building for iOS - Experimental" Off)
+  option(COMPILER_RT_ENABLE_WATCHOS "Enable building for watchOS - Experimental" Off)
+  option(COMPILER_RT_ENABLE_TVOS "Enable building for tvOS - Experimental" Off)
 
   find_darwin_sdk_dir(DARWIN_osx_SYSROOT macosx)
   find_darwin_sdk_dir(DARWIN_iossim_SYSROOT iphonesimulator)
   find_darwin_sdk_dir(DARWIN_ios_SYSROOT iphoneos)
+  find_darwin_sdk_dir(DARWIN_watchossim_SYSROOT watchsimulator)
+  find_darwin_sdk_dir(DARWIN_watchos_SYSROOT watchos)
+  find_darwin_sdk_dir(DARWIN_tvossim_SYSROOT appletvsimulator)
+  find_darwin_sdk_dir(DARWIN_tvos_SYSROOT appletvos)
+
+  if(COMPILER_RT_ENABLE_IOS)
+    list(APPEND DARWIN_EMBEDDED_PLATFORMS ios)
+    set(DARWIN_ios_MIN_VER_FLAG -miphoneos-version-min)
+    set(DARWIN_ios_SANITIZER_MIN_VER_FLAG
+      ${DARWIN_ios_MIN_VER_FLAG}=7.0)
+    set(DARWIN_ios_BUILTIN_MIN_VER 6.0)
+    set(DARWIN_ios_BUILTIN_MIN_VER_FLAG
+      ${DARWIN_ios_MIN_VER_FLAG}=${DARWIN_ios_BUILTIN_MIN_VER})
+  endif()
+  if(COMPILER_RT_ENABLE_WATCHOS)
+    list(APPEND DARWIN_EMBEDDED_PLATFORMS watchos)
+    set(DARWIN_watchos_MIN_VER_FLAG -mwatchos-version-min)
+    set(DARWIN_watchos_SANITIZER_MIN_VER_FLAG
+      ${DARWIN_watchos_MIN_VER_FLAG}=2.0)
+    set(DARWIN_watchos_BUILTIN_MIN_VER 2.0)
+    set(DARWIN_watchos_BUILTIN_MIN_VER_FLAG
+      ${DARWIN_watchos_MIN_VER_FLAG}=${DARWIN_watchos_BUILTIN_MIN_VER})
+  endif()
+  if(COMPILER_RT_ENABLE_TVOS)
+    list(APPEND DARWIN_EMBEDDED_PLATFORMS tvos)
+    set(DARWIN_tvos_MIN_VER_FLAG -mtvos-version-min)
+    set(DARWIN_tvos_SANITIZER_MIN_VER_FLAG
+      ${DARWIN_tvos_MIN_VER_FLAG}=9.0)
+    set(DARWIN_tvos_BUILTIN_MIN_VER 9.0)
+    set(DARWIN_tvos_BUILTIN_MIN_VER_FLAG
+      ${DARWIN_tvos_MIN_VER_FLAG}=${DARWIN_tvos_BUILTIN_MIN_VER})
+  endif()
 
   # Note: In order to target x86_64h on OS X the minimum deployment target must
   # be 10.8 or higher.
   set(SANITIZER_COMMON_SUPPORTED_OS osx)
   set(BUILTIN_SUPPORTED_OS osx)
   set(PROFILE_SUPPORTED_OS osx)
   set(TSAN_SUPPORTED_OS osx)
   if(NOT SANITIZER_MIN_OSX_VERSION)
darwin_test_archs(10.4
       ${toolchain_arches})
     message(STATUS "OSX 10.4 supported arches: ${DARWIN_10.4_ARCHS}")
     if(DARWIN_10.4_ARCHS)
       # don't include the Haswell slice in the 10.4 compatibility library
       list(REMOVE_ITEM DARWIN_10.4_ARCHS x86_64h)
       list(APPEND BUILTIN_SUPPORTED_OS 10.4)
     endif()
 
-    if(DARWIN_iossim_SYSROOT)
-      set(DARWIN_iossim_CFLAGS
+    foreach(platform ${DARWIN_EMBEDDED_PLATFORMS})
+      if(DARWIN_${platform}sim_SYSROOT)
+        set(DARWIN_${platform}sim_CFLAGS
           ${DARWIN_COMMON_CFLAGS}
-        -mios-simulator-version-min=7.0
+          ${DARWIN_${platform}_SANITIZER_MIN_VER_FLAG}
           -isysroot ${DARWIN_iossim_SYSROOT})
-      set(DARWIN_iossim_LINKFLAGS
+        set(DARWIN_${platform}sim_LINKFLAGS
           ${DARWIN_COMMON_LINKFLAGS}
-        -mios-simulator-version-min=7.0
-        -isysroot ${DARWIN_iossim_SYSROOT})
-      set(DARWIN_iossim_BUILTIN_MIN_VER 6.0)
-      set(DARWIN_iossim_BUILTIN_MIN_VER_FLAG
-        -mios-simulator-version-min=${DARWIN_iossim_BUILTIN_MIN_VER})
-
-      set(DARWIN_iossim_SKIP_CC_KEXT On)
-      darwin_test_archs(iossim
-        DARWIN_iossim_ARCHS
+          ${DARWIN_${platform}_SANITIZER_MIN_VER_FLAG}
+          -isysroot ${DARWIN_${platform}sim_SYSROOT})
+        set(DARWIN_${platform}sim_BUILTIN_MIN_VER
+          ${DARWIN_${platform}_BUILTIN_MIN_VER})
+        set(DARWIN_${platform}sim_BUILTIN_MIN_VER_FLAG
+          ${DARWIN_${platform}_BUILTIN_MIN_VER_FLAG})
+
+        set(DARWIN_${platform}sim_SKIP_CC_KEXT On)
+        darwin_test_archs(${platform}sim
+          DARWIN_${platform}sim_ARCHS
           ${toolchain_arches})
-      message(STATUS "iOS Simulator supported arches: ${DARWIN_iossim_ARCHS}")
+        message(STATUS "${platform} Simulator supported arches: ${DARWIN_${platform}sim_ARCHS}")
         if(DARWIN_iossim_ARCHS)
-        list(APPEND SANITIZER_COMMON_SUPPORTED_OS iossim)
-        list(APPEND BUILTIN_SUPPORTED_OS iossim)
-        list(APPEND PROFILE_SUPPORTED_OS iossim)
+          list(APPEND SANITIZER_COMMON_SUPPORTED_OS ${platform}sim)
+          list(APPEND BUILTIN_SUPPORTED_OS ${platform}sim)
+          list(APPEND PROFILE_SUPPORTED_OS ${platform}sim)
         endif()
-      foreach(arch ${DARWIN_iossim_ARCHS})
+        foreach(arch ${DARWIN_${platform}sim_ARCHS})
           list(APPEND COMPILER_RT_SUPPORTED_ARCH ${arch})
           set(CAN_TARGET_${arch} 1)
         endforeach()
       endif()
 
-    if(DARWIN_ios_SYSROOT AND COMPILER_RT_ENABLE_IOS)
-      set(DARWIN_ios_CFLAGS
+      if(DARWIN_${platform}_SYSROOT)
+        set(DARWIN_${platform}_CFLAGS
           ${DARWIN_COMMON_CFLAGS}
-        -miphoneos-version-min=7.0
-        -isysroot ${DARWIN_ios_SYSROOT})
-      set(DARWIN_ios_LINKFLAGS
+          ${DARWIN_${platform}_SANITIZER_MIN_VER_FLAG}
+          -isysroot ${DARWIN_${platform}_SYSROOT})
+        set(DARWIN_${platform}_LINKFLAGS
           ${DARWIN_COMMON_LINKFLAGS}
-        -miphoneos-version-min=7.0
-        -isysroot ${DARWIN_ios_SYSROOT})
-      set(DARWIN_ios_BUILTIN_MIN_VER 6.0)
-      set(DARWIN_ios_BUILTIN_MIN_VER_FLAG
-        -miphoneos-version-min=${DARWIN_ios_BUILTIN_MIN_VER})
+          ${DARWIN_${platform}_SANITIZER_MIN_VER_FLAG}
+          -isysroot ${DARWIN_${platform}_SYSROOT})
 
-      darwin_test_archs(ios
-        DARWIN_ios_ARCHS
+        darwin_test_archs(${platform}
+          DARWIN_${platform}_ARCHS
           ${toolchain_arches})
-      message(STATUS "iOS supported arches: ${DARWIN_ios_ARCHS}")
-      if(DARWIN_ios_ARCHS)
-        list(APPEND SANITIZER_COMMON_SUPPORTED_OS ios)
-        list(APPEND BUILTIN_SUPPORTED_OS ios)
-        list(APPEND PROFILE_SUPPORTED_OS ios)
+        message(STATUS "${platform} supported arches: ${DARWIN_${platform}_ARCHS}")
+        if(DARWIN_${platform}_ARCHS)
+          list(APPEND SANITIZER_COMMON_SUPPORTED_OS ${platform})
+          list(APPEND BUILTIN_SUPPORTED_OS ${platform})
+          list(APPEND PROFILE_SUPPORTED_OS ${platform})
         endif()
-      foreach(arch ${DARWIN_ios_ARCHS})
+        foreach(arch ${DARWIN_${platform}_ARCHS})
           list(APPEND COMPILER_RT_SUPPORTED_ARCH ${arch})
           set(CAN_TARGET_${arch} 1)
         endforeach()
       endif()
+    endforeach()
   endif()
 
   # for list_union
   include(CompilerRTUtils)
 
   list_union(BUILTIN_SUPPORTED_ARCH ALL_BUILTIN_SUPPORTED_ARCH toolchain_arches)
 
   list_union(SANITIZER_COMMON_SUPPORTED_ARCH