Index: cfe/trunk/docs/LanguageExtensions.rst
===================================================================
--- cfe/trunk/docs/LanguageExtensions.rst
+++ cfe/trunk/docs/LanguageExtensions.rst
@@ -324,6 +324,8 @@
   ...
   #endif
 
+.. _languageextensions-builtin-macros:
+
 Builtin Macros
 ==============
 
Index: cfe/trunk/docs/ReleaseNotes.rst
===================================================================
--- cfe/trunk/docs/ReleaseNotes.rst
+++ cfe/trunk/docs/ReleaseNotes.rst
@@ -56,6 +56,11 @@
 Non-comprehensive list of changes in this release
 -------------------------------------------------
 
+- The ``__VERSION__`` macro has been removed.
+  Previously this macro was set to a string aiming to achieve compatibility with 
+  GCC 4.2.1, but that should no longer be necessary. To get Clang's version,
+  use the :ref:`clang namespaced version macros <languageextensions-builtin-macros>`.
+
 - ...
 
 
@@ -79,6 +84,11 @@
 
 - ...
 
+Removed Compiler Options
+------------------------
+
+- ...
+
 New Pragmas in Clang
 --------------------
 
Index: cfe/trunk/lib/Basic/Version.cpp
===================================================================
--- cfe/trunk/lib/Basic/Version.cpp
+++ cfe/trunk/lib/Basic/Version.cpp
@@ -136,8 +136,6 @@
 }
 
 std::string getClangFullCPPVersion() {
-  // The version string we report in __VERSION__ is just a compacted version of
-  // the one we report on the command line.
   std::string buf;
   llvm::raw_string_ostream OS(buf);
 #ifdef CLANG_VENDOR
Index: cfe/trunk/lib/Frontend/InitPreprocessor.cpp
===================================================================
--- cfe/trunk/lib/Frontend/InitPreprocessor.cpp
+++ cfe/trunk/lib/Frontend/InitPreprocessor.cpp
@@ -604,12 +604,6 @@
   // Support for #pragma redefine_extname (Sun compatibility)
   Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1");
 
-  // As sad as it is, enough software depends on the __VERSION__ for version
-  // checks that it is necessary to report 4.2.1 (the base GCC version we claim
-  // compatibility with) first.
-  Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " +
-                      Twine(getClangFullCPPVersion()) + "\"");
-
   // Initialize language-specific preprocessor defines.
 
   // Standard conforming mode?
Index: cfe/trunk/test/Index/complete-exprs.c
===================================================================
--- cfe/trunk/test/Index/complete-exprs.c
+++ cfe/trunk/test/Index/complete-exprs.c
@@ -27,7 +27,6 @@
 // RUN: c-index-test -code-completion-at=%s:7:10 -Xclang -code-completion-patterns %s | FileCheck -check-prefix=CHECK-CC1 %s
 // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_COMPLETION_CACHING=1 c-index-test -code-completion-at=%s:7:10 -Xclang -code-completion-patterns %s | FileCheck -check-prefix=CHECK-CC1 %s
 // CHECK-CC1: NotImplemented:{TypedText __PRETTY_FUNCTION__} (65)
-// CHECK-CC1: macro definition:{TypedText __VERSION__} (70)
 // CHECK-CC1: FunctionDecl:{ResultType int}{TypedText f}{LeftParen (}{Placeholder int}{RightParen )} (12) (unavailable)
 // CHECK-CC1-NOT: NotImplemented:{TypedText float} (65)
 // CHECK-CC1: ParmDecl:{ResultType int}{TypedText j} (8)
@@ -39,7 +38,6 @@
 // RUN: c-index-test -code-completion-at=%s:7:18 -Xclang -code-completion-patterns %s | FileCheck -check-prefix=CHECK-CC1 %s
 // RUN: c-index-test -code-completion-at=%s:7:22 -Xclang -code-completion-patterns %s | FileCheck -check-prefix=CHECK-CC1 %s
 // RUN: c-index-test -code-completion-at=%s:7:2 -Xclang -code-completion-patterns %s | FileCheck -check-prefix=CHECK-CC2 %s
-// CHECK-CC2: macro definition:{TypedText __VERSION__} (70)
 // CHECK-CC2: FunctionDecl:{ResultType int}{TypedText f}{LeftParen (}{Placeholder int}{RightParen )} (50)
 // CHECK-CC2: NotImplemented:{TypedText float} (50)
 // CHECK-CC2: ParmDecl:{ResultType int}{TypedText j} (34)
Index: cfe/trunk/test/Preprocessor/init.c
===================================================================
--- cfe/trunk/test/Preprocessor/init.c
+++ cfe/trunk/test/Preprocessor/init.c
@@ -101,7 +101,6 @@
 // COMMON:#define __ORDER_PDP_ENDIAN__ 3412
 // COMMON:#define __STDC_HOSTED__ 1
 // COMMON:#define __STDC__ 1
-// COMMON:#define __VERSION__ {{.*}}
 // COMMON:#define __clang__ 1
 // COMMON:#define __clang_major__ {{[0-9]+}}
 // COMMON:#define __clang_minor__ {{[0-9]+}}
@@ -8169,7 +8168,6 @@
 // SPARC:#define __UINT_LEAST8_MAX__ 255
 // SPARC:#define __UINT_LEAST8_TYPE__ unsigned char
 // SPARC:#define __USER_LABEL_PREFIX__
-// SPARC:#define __VERSION__ "4.2.1 Compatible{{.*}}
 // SPARC:#define __WCHAR_MAX__ 2147483647
 // SPARC:#define __WCHAR_TYPE__ int
 // SPARC:#define __WCHAR_WIDTH__ 32
@@ -9041,7 +9039,6 @@
 // X86_64-CLOUDABI:#define __UINT_LEAST8_MAX__ 255
 // X86_64-CLOUDABI:#define __UINT_LEAST8_TYPE__ unsigned char
 // X86_64-CLOUDABI:#define __USER_LABEL_PREFIX__
-// X86_64-CLOUDABI:#define __VERSION__ "4.2.1 Compatible{{.*}}
 // X86_64-CLOUDABI:#define __WCHAR_MAX__ 2147483647
 // X86_64-CLOUDABI:#define __WCHAR_TYPE__ int
 // X86_64-CLOUDABI:#define __WCHAR_WIDTH__ 32
@@ -10043,7 +10040,6 @@
 // WEBASSEMBLY-NEXT:#define __UINT_LEAST8_MAX__ 255
 // WEBASSEMBLY-NEXT:#define __UINT_LEAST8_TYPE__ unsigned char
 // WEBASSEMBLY-NEXT:#define __USER_LABEL_PREFIX__
-// WEBASSEMBLY-NEXT:#define __VERSION__ "{{.*}}"
 // WEBASSEMBLY-NEXT:#define __WCHAR_MAX__ 2147483647
 // WEBASSEMBLY-NEXT:#define __WCHAR_TYPE__ int
 // WEBASSEMBLY-NOT:#define __WCHAR_UNSIGNED__
Index: cfe/trunk/utils/builtin-defines.c
===================================================================
--- cfe/trunk/utils/builtin-defines.c
+++ cfe/trunk/utils/builtin-defines.c
@@ -49,7 +49,6 @@
 #undef __INT8_TYPE__
 #undef __SSP__
 #undef __APPLE_CC__
-#undef __VERSION__
 #undef __clang__
 #undef __llvm__
 #undef __nocona