CXX-807 Enforce compiler minima

Author: acmorrow

CMakeLists.txt

@@ -1,6 +1,30 @@
+cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
+
+if(POLICY CMP0025)
+  cmake_policy(SET CMP0025 NEW)
+endif()
+
 project(MONGO_CXX_DRIVER LANGUAGES CXX)
 
-cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.9")
+    message(FATAL_ERROR "Insufficient GCC version - GCC 4.9+ required")
+  endif()
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "19.0.23506")
+    message(FATAL_ERROR "Insufficient Microsoft Visual C++ version - MSVC 2015U1+ required")
+  endif()
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6.2")
+    message(FATAL_ERROR "Insufficient Apple clang version - XCode 6.2+ required")
+  endif()
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "3.5")
+    message(FATAL_ERROR "Insufficient clang version - clang 3.5+ required")
+  endif()
+else()
+  message(WARNING "Unknown compiler... recklessly proceeding without a version check")
+endif()
 
 set (CMAKE_SKIP_BUILD_RPATH false)
 set (CMAKE_BUILD_WITH_INSTALL_RPATH false)