Index: llvm/trunk/cmake/modules/CheckCompilerVersion.cmake
===================================================================
--- llvm/trunk/cmake/modules/CheckCompilerVersion.cmake
+++ llvm/trunk/cmake/modules/CheckCompilerVersion.cmake
@@ -4,11 +4,11 @@
 
 include(CheckCXXSourceCompiles)
 
-set(GCC_MIN 4.8)
+set(GCC_MIN 5.1)
 set(GCC_SOFT_ERROR 5.1)
-set(CLANG_MIN 3.1)
+set(CLANG_MIN 3.5)
 set(CLANG_SOFT_ERROR 3.5)
-set(APPLECLANG_MIN 3.1)
+set(APPLECLANG_MIN 6.0)
 set(APPLECLANG_SOFT_ERROR 6.0)
 
 # https://en.wikipedia.org/wiki/Microsoft_Visual_C#Internal_version_numbering
@@ -17,7 +17,7 @@
 set(MSVC_SOFT_ERROR 19.1)
 
 # Map the above GCC versions to dates: https://gcc.gnu.org/develop.html#timeline
-set(GCC_MIN_DATE 20130322)
+set(GCC_MIN_DATE 20150422)
 set(GCC_SOFT_ERROR_DATE 20150422)
 
 
Index: llvm/trunk/docs/GettingStarted.rst
===================================================================
--- llvm/trunk/docs/GettingStarted.rst
+++ llvm/trunk/docs/GettingStarted.rst
@@ -235,15 +235,6 @@
 * GCC 5.1
 * Visual Studio 2017
 
-The below versions currently soft-error as we transition to the new compiler
-versions listed above. The LLVM codebase is currently known to compile correctly
-with the following compilers, though this will change in the near future:
-
-* Clang 3.1
-* Apple Clang 3.1
-* GCC 4.8
-* Visual Studio 2017
-
 Anything older than these toolchains *may* work, but will require forcing the
 build system with a special option and is not really a supported host platform.
 Also note that older versions of these compilers have often crashed or