[llvm] r199145 - Add a check that the host compiler is modern to CMake, take 1. This is

[Chandler Carruth]

Author: chandlerc
Date: Mon Jan 13 15:47:35 2014
New Revision: 199145

URL: http://llvm.org/viewvc/llvm-project?rev=199145&view=rev
Log:
Add a check that the host compiler is modern to CMake, take 1. This is
likely to be reverted and re-applied a few times. The minimum versions
we're aiming at:

  GCC 4.7
  Clang 3.1
  MSVC 17.0 (Visual Studio 2012)

Let me know if something breaks!

Modified:
    llvm/trunk/cmake/config-ix.cmake

Modified: llvm/trunk/cmake/config-ix.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/config-ix.cmake?rev=199145&r1=199144&r2=199145&view=diff
==============================================================================
--- llvm/trunk/cmake/config-ix.cmake (original)
+++ llvm/trunk/cmake/config-ix.cmake Mon Jan 13 15:47:35 2014
@@ -316,6 +316,25 @@ if (LIBXML2_FOUND)
   endif ()
 endif ()
 
+option(LLVM_FORCE_USE_OLD_TOOLCHAIN
+       "Set to ON if you want to force CMake to use a toolchain older than those supported by LLVM."
+       OFF)
+if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
+  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
+      message(FATAL_ERROR "Host GCC version must be at least 4.7!")
+    endif()
+  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
+      message(FATAL_ERROR "Host Clang version must be at least 3.1!")
+    endif()
+  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 17.0)
+      message(FATAL_ERROR "Host Visual Studio must be at least 2012 (MSVC 17.0)")
+    endif()
+  endif()
+endif()
+
 include(CheckCXXCompilerFlag)
 
 check_cxx_compiler_flag("-Wno-variadic-macros" SUPPORTS_NO_VARIADIC_MACROS_FLAG)