Index: clang/lib/Basic/CMakeLists.txt
===================================================================
--- clang/lib/Basic/CMakeLists.txt
+++ clang/lib/Basic/CMakeLists.txt
@@ -4,45 +4,37 @@
   Support
   )
 
-find_first_existing_vc_file(llvm_vc "${LLVM_MAIN_SRC_DIR}")
-find_first_existing_vc_file(clang_vc "${CLANG_SOURCE_DIR}")
+find_first_existing_vc_file("${LLVM_MAIN_SRC_DIR}" llvm_vc)
+find_first_existing_vc_file("${CLANG_SOURCE_DIR}" clang_vc)
 
 # The VC revision include that we want to generate.
-set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc")
+set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSVersion.inc")
 
-set(get_svn_script "${LLVM_CMAKE_PATH}/GetSVN.cmake")
+set(generate_vcs_version_script "${LLVM_CMAKE_PATH}/GenerateVersionFromVCS.cmake")
 
-if(DEFINED llvm_vc AND DEFINED clang_vc)
-  # Create custom target to generate the VC revision include.
-  add_custom_command(OUTPUT "${version_inc}"
-    DEPENDS "${llvm_vc}" "${clang_vc}" "${get_svn_script}"
-    COMMAND
-    ${CMAKE_COMMAND} "-DFIRST_SOURCE_DIR=${LLVM_MAIN_SRC_DIR}"
-                     "-DFIRST_NAME=LLVM"
-                     "-DSECOND_SOURCE_DIR=${CLANG_SOURCE_DIR}"
-                     "-DSECOND_NAME=SVN"
-                     "-DHEADER_FILE=${version_inc}"
-                     -P "${get_svn_script}")
+if(llvm_vc)
+  set(llvm_source_dir ${LLVM_MAIN_SRC_DIR})
+endif()
+if(clang_vc)
+  set(clang_source_dir ${CLANG_SOURCE_DIR})
+endif()
 
-  # Mark the generated header as being generated.
-  set_source_files_properties("${version_inc}"
-    PROPERTIES GENERATED TRUE
-               HEADER_FILE_ONLY TRUE)
+# Create custom target to generate the VC revision include.
+add_custom_command(OUTPUT "${version_inc}"
+  DEPENDS "${llvm_vc}" "${clang_vc}" "${generate_vcs_version_script}"
+  COMMAND ${CMAKE_COMMAND} "-DNAMES=\"LLVM;CLANG\""
+                           "-DLLVM_SOURCE_DIR=${llvm_source_dir}"
+                           "-DCLANG_SOURCE_DIR=${clang_source_dir}"
+                           "-DHEADER_FILE=${version_inc}"
+                           -P "${generate_vcs_version_script}")
 
-  # Tell Version.cpp that it needs to build with -DHAVE_SVN_VERSION_INC.
-  set_source_files_properties(Version.cpp
-    PROPERTIES COMPILE_DEFINITIONS "HAVE_SVN_VERSION_INC")
-else()
-  # Not producing a VC revision include.
-  set(version_inc)
+# Mark the generated header as being generated.
+set_source_files_properties("${version_inc}"
+  PROPERTIES GENERATED TRUE
+             HEADER_FILE_ONLY TRUE)
 
-  # Being able to force-set the SVN revision in cases where it isn't available
-  # is useful for performance tracking, and matches compatibility from autoconf.
-  if(SVN_REVISION)
-    set_source_files_properties(Version.cpp
-      PROPERTIES COMPILE_DEFINITIONS "SVN_REVISION=\"${SVN_REVISION}\"")
-  endif()
-endif()
+set_property(SOURCE Version.cpp APPEND PROPERTY
+             COMPILE_DEFINITIONS "HAVE_VCS_VERSION_INC")
 
 add_clang_library(clangBasic
   Attributes.cpp
Index: clang/lib/Basic/Version.cpp
===================================================================
--- clang/lib/Basic/Version.cpp
+++ clang/lib/Basic/Version.cpp
@@ -17,8 +17,8 @@
 #include <cstdlib>
 #include <cstring>
 
-#ifdef HAVE_SVN_VERSION_INC
-#  include "SVNVersion.inc"
+#ifdef HAVE_VCS_VERSION_INC
+#include "VCSVersion.inc"
 #endif
 
 namespace clang {
@@ -27,13 +27,13 @@
 #if defined(CLANG_REPOSITORY_STRING)
   return CLANG_REPOSITORY_STRING;
 #else
-#ifdef SVN_REPOSITORY
-  StringRef URL(SVN_REPOSITORY);
+#ifdef CLANG_REPOSITORY
+  StringRef URL(CLANG_REPOSITORY);
 #else
   StringRef URL("");
 #endif
 
-  // If the SVN_REPOSITORY is empty, try to use the SVN keyword. This helps us
+  // If the CLANG_REPOSITORY is empty, try to use the SVN keyword. This helps us
   // pick up a tag in an SVN export, for example.
   StringRef SVNRepository("$URL$");
   if (URL.empty()) {
@@ -71,8 +71,8 @@
 }
 
 std::string getClangRevision() {
-#ifdef SVN_REVISION
-  return SVN_REVISION;
+#ifdef CLANG_REVISION
+  return CLANG_REVISION;
 #else
   return "";
 #endif
Index: lldb/source/CMakeLists.txt
===================================================================
--- lldb/source/CMakeLists.txt
+++ lldb/source/CMakeLists.txt
@@ -15,29 +15,29 @@
   endif()
 endforeach()
 
-if(DEFINED lldb_vc)
-  set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc")
-  set(get_svn_script "${LLVM_CMAKE_PATH}/GetSVN.cmake")
+set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSVersion.inc")
+set(generate_vcs_version_script "${LLVM_CMAKE_PATH}/GenerateVersionFromVCS.cmake")
 
-  # Create custom target to generate the VC revision include.
-  add_custom_command(OUTPUT "${version_inc}"
-    DEPENDS "${lldb_vc}" "${get_svn_script}"
-    COMMAND
-    ${CMAKE_COMMAND} "-DFIRST_SOURCE_DIR=${LLDB_SOURCE_DIR}"
-                     "-DFIRST_NAME=LLDB"
-                     "-DHEADER_FILE=${version_inc}"
-                     -P "${get_svn_script}")
+if(lldb_vc)
+  set(lldb_source_dir ${LLDB_SOURCE_DIR})
+endif()
 
-  # Mark the generated header as being generated.
-  set_source_files_properties("${version_inc}"
-    PROPERTIES GENERATED TRUE
-               HEADER_FILE_ONLY TRUE)
+add_custom_command(OUTPUT "${version_inc}"
+  DEPENDS "${lldb_vc}" "${generate_vcs_version_script}"
+  COMMAND ${CMAKE_COMMAND} "-DNAMES=LLDB"
+                           "-DLLDB_SOURCE_DIR=${LLDB_SOURCE_DIR}"
+                           "-DHEADER_FILE=${version_inc}"
+                           -P "${generate_vcs_version_script}")
 
-  # Tell Version.cpp that it needs to build with -DHAVE_SVN_VERSION_INC.
-  set_property(SOURCE lldb.cpp APPEND PROPERTY 
-               COMPILE_DEFINITIONS "HAVE_SVN_VERSION_INC")
-  list(APPEND lldbBase_SOURCES ${version_inc})
-endif()
+# Mark the generated header as being generated.
+set_source_files_properties("${version_inc}"
+  PROPERTIES GENERATED TRUE
+             HEADER_FILE_ONLY TRUE)
+
+set_property(SOURCE lldb.cpp APPEND PROPERTY
+             COMPILE_DEFINITIONS "HAVE_VCS_VERSION_INC")
+
+list(APPEND lldbBase_SOURCES ${version_inc})
 
 if(APPLE)
   set(apple_version_inc "${CMAKE_CURRENT_BINARY_DIR}/AppleVersion.inc")
Index: lldb/source/lldb.cpp
===================================================================
--- lldb/source/lldb.cpp
+++ lldb/source/lldb.cpp
@@ -13,8 +13,8 @@
 
 #include "clang/Basic/Version.h"
 
-#ifdef HAVE_SVN_VERSION_INC
-#include "SVNVersion.inc"
+#ifdef HAVE_VCS_VERSION_INC
+#include "VCSVersion.inc"
 #endif
 
 #ifdef HAVE_APPLE_VERSION_INC
Index: llvm/CMakeLists.txt
===================================================================
--- llvm/CMakeLists.txt
+++ llvm/CMakeLists.txt
@@ -239,7 +239,7 @@
 include(VersionFromVCS)
 
 option(LLVM_APPEND_VC_REV
-  "Embed the version control system revision id in LLVM" ON)
+  "Embed the version control system revision in LLVM" ON)
 
 set(PACKAGE_NAME LLVM)
 set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
@@ -791,13 +791,12 @@
 set(LLVM_SRPM_BINARY_SPECFILE ${CMAKE_CURRENT_BINARY_DIR}/llvm.spec)
 set(LLVM_SRPM_DIR "${CMAKE_CURRENT_BINARY_DIR}/srpm")
 
-# SVN_REVISION and GIT_COMMIT get set by the call to add_version_info_from_vcs.
-# DUMMY_VAR contains a version string which we don't care about.
-add_version_info_from_vcs(DUMMY_VAR)
-if ( SVN_REVISION )
-  set(LLVM_RPM_SPEC_REVISION "r${SVN_REVISION}")
-elseif ( GIT_COMMIT )
-  set (LLVM_RPM_SPEC_REVISION "g${GIT_COMMIT}")
+get_source_info(${CMAKE_CURRENT_SOURCE_DIR} revision repository)
+string(LENGTH "${revision}" revision_length)
+if(revision MATCHES "^[0-9]+$" AND revision_length LESS 40)
+  set(LLVM_RPM_SPEC_REVISION "r${revision}")
+else()
+  set(LLVM_RPM_SPEC_REVISION "${revision}")
 endif()
 
 configure_file(
Index: llvm/cmake/modules/AddLLVM.cmake
===================================================================
--- llvm/cmake/modules/AddLLVM.cmake
+++ llvm/cmake/modules/AddLLVM.cmake
@@ -1717,35 +1717,35 @@
   set_target_properties(${name} PROPERTIES RULE_LAUNCH_COMPILE ${sandbox_command})
 endfunction()
 
-# Figure out if we can track VC revisions.
-function(find_first_existing_file out_var)
-  foreach(file ${ARGN})
-    if(EXISTS "${file}")
-      set(${out_var} "${file}" PARENT_SCOPE)
-      return()
-    endif()
-  endforeach()
-endfunction()
-
-macro(find_first_existing_vc_file out_var path)
-    find_program(git_executable NAMES git git.exe git.cmd)
-    # Run from a subdirectory to force git to print an absolute path.
-    execute_process(COMMAND ${git_executable} rev-parse --git-dir
-      WORKING_DIRECTORY ${path}/cmake
-      RESULT_VARIABLE git_result
-      OUTPUT_VARIABLE git_dir
-      ERROR_QUIET)
-    if(git_result EQUAL 0)
-      string(STRIP "${git_dir}" git_dir)
-      set(${out_var} "${git_dir}/logs/HEAD")
-      # some branchless cases (e.g. 'repo') may not yet have .git/logs/HEAD
-      if (NOT EXISTS "${git_dir}/logs/HEAD")
-        file(WRITE "${git_dir}/logs/HEAD" "")
+function(find_first_existing_vc_file path out_var)
+  if(EXISTS "${path}/.svn")
+    set(svn_files
+      "${path}/.svn/wc.db"   # SVN 1.7
+      "${path}/.svn/entries" # SVN 1.6
+    )
+    foreach(file IN LISTS svn_files)
+      if(EXISTS "${file}")
+        set(${out_var} "${file}" PARENT_SCOPE)
+        return()
+      endif()
+    endforeach()
+  else()
+    find_package(Git)
+    if(GIT_FOUND)
+      execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --git-dir
+        WORKING_DIRECTORY ${path}
+        RESULT_VARIABLE git_result
+        OUTPUT_VARIABLE git_output
+        ERROR_QUIET)
+      if(git_result EQUAL 0)
+        string(STRIP "${git_output}" git_output)
+        get_filename_component(git_dir ${git_output} ABSOLUTE BASE_DIR ${path})
+        # Some branchless cases (e.g. 'repo') may not yet have .git/logs/HEAD
+        if (NOT EXISTS "${git_dir}/logs/HEAD")
+          file(WRITE "${git_dir}/logs/HEAD" "")
+        endif()
+        set(${out_var} "${git_dir}/logs/HEAD" PARENT_SCOPE)
       endif()
-    else()
-      find_first_existing_file(${out_var}
-        "${path}/.svn/wc.db"   # SVN 1.7
-        "${path}/.svn/entries" # SVN 1.6
-      )
     endif()
-endmacro()
+  endif()
+endfunction()
Index: llvm/cmake/modules/GenerateVersionFromCVS.cmake
===================================================================
--- llvm/cmake/modules/GenerateVersionFromCVS.cmake
+++ /dev/null
@@ -1,39 +0,0 @@
-# CMake project that writes Subversion revision information to a header.
-#
-# Input variables:
-#   SRC               - Source directory
-#   HEADER_FILE       - The header file to write
-#
-# The output header will contain macros FIRST_REPOSITORY and FIRST_REVISION,
-# and SECOND_REPOSITORY and SECOND_REVISION if requested, where "FIRST" and
-# "SECOND" are substituted with the names specified in the input variables.
-
-
-
-# Chop off cmake/modules/GetSVN.cmake
-get_filename_component(LLVM_DIR "${CMAKE_SCRIPT_MODE_FILE}" PATH)
-get_filename_component(LLVM_DIR "${LLVM_DIR}" PATH)
-get_filename_component(LLVM_DIR "${LLVM_DIR}" PATH)
-
-set(CMAKE_MODULE_PATH
-  ${CMAKE_MODULE_PATH}
-  "${LLVM_DIR}/cmake/modules")
-include(VersionFromVCS)
-
-# Handle strange terminals
-set(ENV{TERM} "dumb")
-
-function(append_info name path)
-  add_version_info_from_vcs(REVISION ${path})
-  string(STRIP "${REVISION}" REVISION)
-  file(APPEND "${HEADER_FILE}.txt"
-    "#define ${name} \"${REVISION}\"\n")
-endfunction()
-
-append_info(${NAME} "${SOURCE_DIR}")
-
-# Copy the file only if it has changed.
-execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
-  "${HEADER_FILE}.txt" "${HEADER_FILE}")
-file(REMOVE "${HEADER_FILE}.txt")
-
Index: llvm/cmake/modules/GenerateVersionFromVCS.cmake
===================================================================
--- /dev/null
+++ llvm/cmake/modules/GenerateVersionFromVCS.cmake
@@ -0,0 +1,53 @@
+# CMake script that writes version control information to a header.
+#
+# Input variables:
+#   NAMES             - A list of names for each of the source directories.
+#   <NAME>_SOURCE_DIR - A path to source directory for each name in NAMES.
+#   HEADER_FILE       - The header file to write
+#
+# The output header will contain macros <NAME>_REPOSITORY and <NAME>_REVISION,
+# where "<NAME>" is substituted with the names specified in the input variables,
+# for each of the <NAME>_SOURCE_DIR given.
+
+get_filename_component(LLVM_DIR "${CMAKE_SCRIPT_MODE_FILE}" PATH)
+get_filename_component(LLVM_DIR "${LLVM_DIR}" PATH)
+get_filename_component(LLVM_DIR "${LLVM_DIR}" PATH)
+
+list(APPEND CMAKE_MODULE_PATH "${LLVM_DIR}/cmake/modules")
+
+include(VersionFromVCS)
+
+# Handle strange terminals
+set(ENV{TERM} "dumb")
+
+function(append_info name path)
+  if(path)
+    get_source_info("${path}" revision repository)
+  endif()
+  if(revision)
+    file(APPEND "${HEADER_FILE}.tmp"
+      "#define ${name}_REVISION \"${revision}\"\n")
+  else()
+    file(APPEND "${HEADER_FILE}.tmp"
+      "#undef ${name}_REVISION\n")
+  endif()
+  if(repository)
+    file(APPEND "${HEADER_FILE}.tmp"
+      "#define ${name}_REPOSITORY \"${repository}\"\n")
+  else()
+    file(APPEND "${HEADER_FILE}.tmp"
+      "#undef ${name}_REPOSITORY\n")
+  endif()
+endfunction()
+
+foreach(name IN LISTS NAMES)
+  if(NOT DEFINED ${name}_SOURCE_DIR)
+    message(FATAL_ERROR "${name}_SOURCE_DIR is not defined")
+  endif()
+  append_info(${name} "${${name}_SOURCE_DIR}")
+endforeach()
+
+# Copy the file only if it has changed.
+execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
+  "${HEADER_FILE}.tmp" "${HEADER_FILE}")
+file(REMOVE "${HEADER_FILE}.tmp")
Index: llvm/cmake/modules/GetSVN.cmake
===================================================================
--- llvm/cmake/modules/GetSVN.cmake
+++ /dev/null
@@ -1,141 +0,0 @@
-# CMake project that writes Subversion revision information to a header.
-#
-# Input variables:
-#   SOURCE_DIRS - A list of source directories.
-#   NAMES       - A list of macro prefixes for each of the source directories.
-#   HEADER_FILE - The header file to write
-#
-# The output header will contain macros <NAME>_REPOSITORY and <NAME>_REVISION,
-# where "<NAME>" and is substituted with the names specified in the input
-# variables, for each of the SOURCE_DIRS given.
-
-# Chop off cmake/modules/GetSVN.cmake
-get_filename_component(LLVM_DIR "${CMAKE_SCRIPT_MODE_FILE}" PATH)
-get_filename_component(LLVM_DIR "${LLVM_DIR}" PATH)
-get_filename_component(LLVM_DIR "${LLVM_DIR}" PATH)
-
-# Handle strange terminals
-set(ENV{TERM} "dumb")
-
-macro(get_source_info_svn path revision repository)
-  # If svn is a bat file, find_program(Subversion) doesn't find it.
-  # Explicitly search for that here; Subversion_SVN_EXECUTABLE will override
-  # the find_program call in FindSubversion.cmake.
-  find_program(Subversion_SVN_EXECUTABLE NAMES svn svn.bat)
-
-  # FindSubversion does not work with symlinks. See PR 8437
-  if (NOT IS_SYMLINK "${path}")
-    find_package(Subversion)
-  endif()
-  if (Subversion_FOUND)
-    subversion_wc_info( ${path} Project )
-    if (Project_WC_REVISION)
-      set(${revision} ${Project_WC_REVISION} PARENT_SCOPE)
-    endif()
-    if (Project_WC_URL)
-      set(${repository} ${Project_WC_URL} PARENT_SCOPE)
-    endif()
-  endif()
-endmacro()
-
-macro(get_source_info_git_svn path revision repository)
-  find_program(git_executable NAMES git git.exe git.cmd)
-  if (git_executable)
-    execute_process(COMMAND ${git_executable} svn info
-      WORKING_DIRECTORY ${path}
-      TIMEOUT 5
-      RESULT_VARIABLE git_result
-      OUTPUT_VARIABLE git_output)
-    if (git_result EQUAL 0)
-      string(REGEX REPLACE "^(.*\n)?Revision: ([^\n]+).*"
-        "\\2" git_svn_rev "${git_output}")
-      set(${revision} ${git_svn_rev} PARENT_SCOPE)
-      string(REGEX REPLACE "^(.*\n)?URL: ([^\n]+).*"
-        "\\2" git_url "${git_output}")
-      set(${repository} ${git_url} PARENT_SCOPE)
-    endif()
-  endif()
-endmacro()
-
-macro(get_source_info_git path revision repository)
-  find_program(git_executable NAMES git git.exe git.cmd)
-  if (git_executable)
-    execute_process(COMMAND ${git_executable} log -1 --pretty=format:%H
-      WORKING_DIRECTORY ${path}
-      TIMEOUT 5
-      RESULT_VARIABLE git_result
-      OUTPUT_VARIABLE git_output)
-    if (git_result EQUAL 0)
-      set(${revision} ${git_output} PARENT_SCOPE)
-    endif()
-    execute_process(COMMAND ${git_executable} remote -v
-      WORKING_DIRECTORY ${path}
-      TIMEOUT 5
-      RESULT_VARIABLE git_result
-      OUTPUT_VARIABLE git_output)
-    if (git_result EQUAL 0)
-      string(REGEX REPLACE "^(.*\n)?[^ \t]+[ \t]+([^ \t\n]+)[ \t]+\\(fetch\\).*"
-        "\\2" git_url "${git_output}")
-      set(${repository} "${git_url}" PARENT_SCOPE)
-    endif()
-  endif()
-endmacro()
-
-function(get_source_info path revision repository)
-  if (EXISTS "${path}/.svn")
-    get_source_info_svn("${path}" revision repository)
-  elseif (EXISTS "${path}/.git/svn/refs")
-    get_source_info_git_svn("${path}" revision repository)
-  elseif (EXISTS "${path}/.git")
-    get_source_info_git("${path}" revision repository)
-  endif()
-endfunction()
-
-function(append_info name path)
-  get_source_info("${path}" revision repository)
-  string(STRIP "${revision}" revision)
-  string(STRIP "${repository}" repository)
-  file(APPEND "${HEADER_FILE}.txt"
-    "#define ${name}_REVISION \"${revision}\"\n")
-  file(APPEND "${HEADER_FILE}.txt"
-    "#define ${name}_REPOSITORY \"${repository}\"\n")
-endfunction()
-
-function(validate_inputs source_dirs names)
-  list(LENGTH source_dirs source_dirs_length)
-  list(LENGTH names names_length)
-  if (NOT source_dirs_length EQUAL names_length)
-    message(FATAL_ERROR
-            "GetSVN.cmake takes two arguments: a list of source directories, "
-            "and a list of names. Expected two lists must be of equal length, "
-            "but got ${source_dirs_length} source directories and "
-            "${names_length} names.")
-  endif()
-endfunction()
-
-if (DEFINED SOURCE_DIRS AND DEFINED NAMES)
-  validate_inputs("${SOURCE_DIRS}" "${NAMES}")
-
-  list(LENGTH SOURCE_DIRS source_dirs_length)
-  math(EXPR source_dirs_max_index ${source_dirs_length}-1)
-  foreach(index RANGE ${source_dirs_max_index})
-    list(GET SOURCE_DIRS ${index} source_dir)
-    list(GET NAMES ${index} name)
-    append_info(${name} ${source_dir})
-  endforeach()
-endif()
-
-# Allow -DFIRST_SOURCE_DIR arguments until Clang migrates to the new
-# -DSOURCE_DIRS argument.
-if(DEFINED FIRST_SOURCE_DIR)
-  append_info(${FIRST_NAME} "${FIRST_SOURCE_DIR}")
-  if(DEFINED SECOND_SOURCE_DIR)
-    append_info(${SECOND_NAME} "${SECOND_SOURCE_DIR}")
-  endif()
-endif()
-
-# Copy the file only if it has changed.
-execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
-  "${HEADER_FILE}.txt" "${HEADER_FILE}")
-file(REMOVE "${HEADER_FILE}.txt")
-
Index: llvm/cmake/modules/VersionFromVCS.cmake
===================================================================
--- llvm/cmake/modules/VersionFromVCS.cmake
+++ llvm/cmake/modules/VersionFromVCS.cmake
@@ -3,90 +3,92 @@
 # existence of certain subdirectories under SOURCE_DIR (if provided as an
 # extra argument, otherwise uses CMAKE_CURRENT_SOURCE_DIR).
 
-function(add_version_info_from_vcs VERS)
-  SET(SOURCE_DIR ${ARGV1})
-  if("${SOURCE_DIR}" STREQUAL "")
-      SET(SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
-  endif()
-  string(REPLACE "svn" "" result "${${VERS}}")
-  if( EXISTS "${SOURCE_DIR}/.svn" )
-    set(result "${result}svn")
-    # FindSubversion does not work with symlinks. See PR 8437
-    if( NOT IS_SYMLINK "${SOURCE_DIR}" )
-      find_package(Subversion)
+function(get_source_info_svn path revision repository)
+  # If svn is a bat file, find_program(Subversion) doesn't find it.
+  # Explicitly search for that here; Subversion_SVN_EXECUTABLE will override
+  # the find_program call in FindSubversion.cmake.
+  find_program(Subversion_SVN_EXECUTABLE NAMES svn svn.bat)
+  find_package(Subversion)
+
+  # Subversion module does not work with symlinks, see PR8437.
+  get_filename_component(realpath ${path} REALPATH)
+  if(Subversion_FOUND)
+    subversion_wc_info(${realpath} Project)
+    if(Project_WC_REVISION)
+      set(${revision} ${Project_WC_REVISION} PARENT_SCOPE)
     endif()
-    if( Subversion_FOUND )
-      subversion_wc_info( ${SOURCE_DIR} Project )
-      if( Project_WC_REVISION )
-        set(SVN_REVISION ${Project_WC_REVISION} PARENT_SCOPE)
-        set(result "${result}-r${Project_WC_REVISION}")
-      endif()
-      if( Project_WC_URL )
-        set(LLVM_REPOSITORY ${Project_WC_URL} PARENT_SCOPE)
-      endif()
+    if(Project_WC_URL)
+      set(${repository} ${Project_WC_URL} PARENT_SCOPE)
     endif()
-  else()
-    find_program(git_executable NAMES git git.exe git.cmd)
-
-    if( git_executable )
-      # Run from a subdirectory to force git to print an absoute path.
-      execute_process(COMMAND ${git_executable} rev-parse --git-dir
-        WORKING_DIRECTORY ${SOURCE_DIR}/cmake
-        RESULT_VARIABLE git_result
-        OUTPUT_VARIABLE git_dir
-        ERROR_QUIET)
-      if(git_result EQUAL 0)
-        # Try to get a ref-id
-        string(STRIP "${git_dir}" git_dir)
-        set(result "${result}git")
-        if( EXISTS ${git_dir}/svn )
-          # Get the repository URL
-          execute_process(COMMAND
-            ${git_executable} svn info
-            WORKING_DIRECTORY ${SOURCE_DIR}
-            TIMEOUT 5
-            RESULT_VARIABLE git_result
-            OUTPUT_VARIABLE git_output
-            ERROR_QUIET)
-          if( git_result EQUAL 0 )
-            string(REGEX MATCH "URL: ([^ \n]*)" svn_url ${git_output})
-            if(svn_url)
-              set(LLVM_REPOSITORY ${CMAKE_MATCH_1} PARENT_SCOPE)
-            endif()
-          endif()
+  endif()
+endfunction()
 
-          # Get the svn revision number for this git commit if one exists.
-          execute_process(COMMAND ${git_executable} svn find-rev HEAD
-            WORKING_DIRECTORY ${SOURCE_DIR}
-            TIMEOUT 5
-            RESULT_VARIABLE git_result
-            OUTPUT_VARIABLE git_head_svn_rev_number
-            OUTPUT_STRIP_TRAILING_WHITESPACE)
-          if( git_result EQUAL 0 AND git_output)
-            set(SVN_REVISION ${git_head_svn_rev_number} PARENT_SCOPE)
-            set(git_svn_rev "-svn-${git_head_svn_rev_number}")
-          else()
-            set(git_svn_rev "")
-          endif()
+function(get_source_info_git path revision repository)
+  find_package(Git)
+  if(GIT_FOUND)
+    execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --git-dir
+      WORKING_DIRECTORY ${path}
+      RESULT_VARIABLE git_result
+      OUTPUT_VARIABLE git_output
+      ERROR_QUIET)
+    if(git_result EQUAL 0)
+      string(STRIP "${git_output}" git_output)
+      get_filename_component(git_dir ${git_output} ABSOLUTE BASE_DIR ${path})
+      if(EXISTS "${git_dir}/svn/refs")
+        execute_process(COMMAND ${GIT_EXECUTABLE} svn info
+          WORKING_DIRECTORY ${path}
+          RESULT_VARIABLE git_result
+          OUTPUT_VARIABLE git_output)
+        if(git_result EQUAL 0)
+          string(REGEX REPLACE "^(.*\n)?Revision: ([^\n]+).*"
+            "\\2" git_svn_rev "${git_output}")
+          set(${revision} ${git_svn_rev} PARENT_SCOPE)
+          string(REGEX REPLACE "^(.*\n)?URL: ([^\n]+).*"
+            "\\2" git_url "${git_output}")
+          set(${repository} ${git_url} PARENT_SCOPE)
         endif()
-
-        # Get the git ref id
-        execute_process(COMMAND
-          ${git_executable} rev-parse --short HEAD
-          WORKING_DIRECTORY ${SOURCE_DIR}
-          TIMEOUT 5
+      else()
+        execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
+          WORKING_DIRECTORY ${path}
           RESULT_VARIABLE git_result
-          OUTPUT_VARIABLE git_ref_id
-          OUTPUT_STRIP_TRAILING_WHITESPACE)
-
-        if( git_result EQUAL 0 )
-          set(GIT_COMMIT ${git_ref_id} PARENT_SCOPE)
-          set(result "${result}${git_svn_rev}-${git_ref_id}")
+          OUTPUT_VARIABLE git_output)
+        if(git_result EQUAL 0)
+          string(STRIP "${git_output}" git_output)
+          set(${revision} ${git_output} PARENT_SCOPE)
+        endif()
+        execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref --symbolic-full-name @{upstream}
+          WORKING_DIRECTORY ${path}
+          RESULT_VARIABLE git_result
+          OUTPUT_VARIABLE git_output
+          ERROR_QUIET)
+        if(git_result EQUAL 0)
+          string(REPLACE "/" ";" branch ${git_output})
+          list(GET branch 0 remote)
         else()
-          set(result "${result}${git_svn_rev}")
+          set(remote "origin")
+        endif()
+        execute_process(COMMAND ${GIT_EXECUTABLE} remote get-url ${remote}
+          WORKING_DIRECTORY ${path}
+          RESULT_VARIABLE git_result
+          OUTPUT_VARIABLE git_output
+          ERROR_QUIET)
+        if(git_result EQUAL 0)
+          string(STRIP "${git_output}" git_output)
+          set(${repository} ${git_output} PARENT_SCOPE)
+        else()
+          set(${repository} ${path} PARENT_SCOPE)
         endif()
       endif()
     endif()
   endif()
-  set(${VERS} ${result} PARENT_SCOPE)
-endfunction(add_version_info_from_vcs)
+endfunction()
+
+function(get_source_info path revision repository)
+  if(EXISTS "${path}/.svn")
+    get_source_info_svn("${path}" revision_info repository_info)
+  else()
+    get_source_info_git("${path}" revision_info repository_info)
+  endif()
+  set(${repository} "${repository_info}" PARENT_SCOPE)
+  set(${revision} "${revision_info}" PARENT_SCOPE)
+endfunction()
Index: llvm/include/llvm/Support/CMakeLists.txt
===================================================================
--- llvm/include/llvm/Support/CMakeLists.txt
+++ llvm/include/llvm/Support/CMakeLists.txt
@@ -1,38 +1,21 @@
-find_first_existing_vc_file(llvm_vc "${LLVM_MAIN_SRC_DIR}")
+find_first_existing_vc_file("${LLVM_MAIN_SRC_DIR}" llvm_vc)
 
 # The VC revision include that we want to generate.
 set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSRevision.h")
 
-set(get_svn_script "${LLVM_CMAKE_PATH}/GenerateVersionFromCVS.cmake")
+set(generate_vcs_version_script "${LLVM_CMAKE_PATH}/GenerateVersionFromVCS.cmake")
 
-file(WRITE "${version_inc}.undef" "#undef LLVM_REVISION\n")
-if((DEFINED llvm_vc) AND LLVM_APPEND_VC_REV)
-
-  execute_process(COMMAND ${CMAKE_COMMAND} -E compare_files
-      "${version_inc}.undef" "${version_inc}"
-      RESULT_VARIABLE files_not_equal
-      OUTPUT_QUIET
-      ERROR_QUIET)
-  # Remove ${version_inc} if it doesn't define a revision. This will force it
-  # to be regenerated when toggling LLVM_APPEND_VC_REV from OFF to ON.
-  if(NOT files_not_equal)
-    file(REMOVE "${version_inc}")
-  endif()
-
-  # Create custom target to generate the VC revision include.
-  add_custom_command(OUTPUT "${version_inc}"
-    DEPENDS "${llvm_vc}" "${get_svn_script}"
-    COMMAND
-    ${CMAKE_COMMAND} "-DSOURCE_DIR=${LLVM_MAIN_SRC_DIR}"
-                     "-DNAME=LLVM_REVISION"
-                     "-DHEADER_FILE=${version_inc}"
-                     -P "${get_svn_script}")
-else()
-  # Make sure ${version_inc} doesn't define a revision
-  execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
-    "${version_inc}.undef" "${version_inc}")
+if(llvm_vc AND LLVM_APPEND_VC_REV)
+  set(llvm_source_dir ${LLVM_MAIN_SRC_DIR})
 endif()
-file(REMOVE "${version_inc}.undef")
+
+# Create custom target to generate the VC revision include.
+add_custom_command(OUTPUT "${version_inc}"
+  DEPENDS "${llvm_vc}" "${generate_vcs_version_script}"
+  COMMAND ${CMAKE_COMMAND} "-DNAMES=LLVM"
+                           "-DLLVM_SOURCE_DIR=${llvm_source_dir}"
+                           "-DHEADER_FILE=${version_inc}"
+                           -P "${generate_vcs_version_script}")
 
 # Mark the generated header as being generated.
 set_source_files_properties("${version_inc}"