[llvm] r229598 - Downgrade build system error message to a warning

[Filipe Cabecinhas]

Author: filcab
Date: Tue Feb 17 19:12:38 2015
New Revision: 229598

URL: http://llvm.org/viewvc/llvm-project?rev=229598&view=rev
Log:
Downgrade build system error message to a warning

Instead of requiring MSVC 2013 U4, we simply warn users, since some might
not bt able to immediately upgrade.

Modified:
    llvm/trunk/cmake/modules/HandleLLVMOptions.cmake

Modified: llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/HandleLLVMOptions.cmake?rev=229598&r1=229597&r2=229598&view=diff
==============================================================================
--- llvm/trunk/cmake/modules/HandleLLVMOptions.cmake (original)
+++ llvm/trunk/cmake/modules/HandleLLVMOptions.cmake Tue Feb 17 19:12:38 2015
@@ -41,8 +41,11 @@ int main() { return (float)x; }"
       set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
     endif()
   elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
-    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101)
-      message(FATAL_ERROR "Host Visual Studio must be at least 2013 Update 4 (MSVC 18.0.31101)")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
+      message(FATAL_ERROR "Host Visual Studio must be at least 2013")
+    elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101)
+      message(WARNING "Host Visual Studio should at least be 2013 Update 4 (MSVC 18.0.31101)"
+        "  due to miscompiles from earlier versions")
     endif()
   endif()
 endif()