From ba7b8e6d7336fd4529cfe1de50b224a98d6ff496 Mon Sep 17 00:00:00 2001
From: Alexander Karatarakis <alkarata@microsoft.com>
Date: Thu, 29 Mar 2018 15:29:16 -0700
Subject: Add message for appleclang versions that don't support
 std::filesystem

---
 toolsrc/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/toolsrc/CMakeLists.txt b/toolsrc/CMakeLists.txt
index da0f41631..2a1304526 100644
--- a/toolsrc/CMakeLists.txt
+++ b/toolsrc/CMakeLists.txt
@@ -3,6 +3,12 @@ project(vcpkg C CXX)
 
 if(CMAKE_COMPILER_IS_GNUXX OR CMAKE_CXX_COMPILER_ID MATCHES "GNU")
     set(GCC 1)
+elseif(CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS_EQUAL 9.0.0)
+        message(FATAL_ERROR "Apple clang versions 9 and below do not have support for the C++ Filesystem TS. Please install gcc6 or newer from homebrew (brew install gcc6).")
+    else()
+        set(CLANG 1)
+    endif()
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "[Cc]lang")
     set(CLANG 1)
 elseif(MSVC)
-- 
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