[vcpkg] Fix iOS toolchain detection when using the iOS community triplets (#12361)

* [vcpkg ios] Fix detection of iOS toolchain (#6003)

Added mapping of CMAKE_SYSTEM_NAME == iOS to the bundled iOS toolchain
file.

This fixes the "Unable to determine toolchain to use for
triplet arm64-ios with CMAKE_SYSTEM_NAME iOS" error.

* [vcpkg ios] Set the CMake system processor for the simulator arches (#6003)

So it's consistent for all architectures.

scripts/toolchains/ios.cmake

@@ -16,9 +16,11 @@ if(NOT _VCPKG_IOS_TOOLCHAIN)
             set(_vcpkg_ios_system_processor "arm")
             set(_vcpkg_ios_target_architecture "armv7")
         elseif("${arch}" STREQUAL "x64")
+            set(_vcpkg_ios_system_processor "x86_64")
             set(_vcpkg_ios_sysroot "iphonesimulator")
             set(_vcpkg_ios_target_architecture "x86_64")
         elseif("${arch}" STREQUAL "x86")
+            set(_vcpkg_ios_system_processor "i386")
             set(_vcpkg_ios_sysroot "iphonesimulator")
             set(_vcpkg_ios_target_architecture "i386")
         else()

toolsrc/src/vcpkg/build.cpp

@@ -612,6 +612,10 @@ namespace vcpkg::Build
         {
             return m_paths.scripts / fs::u8path("toolchains/android.cmake");
         }
+        else if (cmake_system_name == "iOS")
+        {
+            return m_paths.scripts / fs::u8path("toolchains/ios.cmake");
+        }
         else if (cmake_system_name.empty() || cmake_system_name == "Windows" || cmake_system_name == "WindowsStore")
         {
             return m_paths.scripts / fs::u8path("toolchains/windows.cmake");