1 files changed, 43 insertions, 25 deletions
diff --git a/clang/lib/Basic/CMakeLists.txt b/clang/lib/Basic/CMakeLists.txt
index 3bcbc89f8ca..62748a08e51 100644
--- a/clang/lib/Basic/CMakeLists.txt
+++ b/clang/lib/Basic/CMakeLists.txt
@@ -4,6 +4,48 @@ set(LLVM_LINK_COMPONENTS
   Support
   )
 
+# 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()
+
+find_first_existing_file(llvm_vc
+  "${LLVM_MAIN_SRC_DIR}/.git/logs/HEAD"
+  "${LLVM_MAIN_SRC_DIR}/.svn/entries")
+find_first_existing_file(clang_vc
+  "${CLANG_SOURCE_DIR}/.git/logs/HEAD"
+  "${CLANG_SOURCE_DIR}/.svn/entries")
+
+if(DEFINED llvm_vc AND DEFINED clang_vc)
+  # Create custom target to generate the VC revision include.
+  add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc"
+    DEPENDS "${llvm_vc}" "${clang_vc}"
+    COMMAND
+    ${CMAKE_COMMAND} "-DFIRST_SOURCE_DIR=${LLVM_MAIN_SRC_DIR}"
+                     "-DFIRST_NAME=LLVM"
+                     "-DSECOND_SOURCE_DIR=${CLANG_SOURCE_DIR}"
+                     "-DSECOND_NAME=SVN"
+                     "-DHEADER_FILE=${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc"
+                     -P "${LLVM_MAIN_SRC_DIR}/cmake/modules/GetSVN.cmake")
+
+  # Mark the generated header as being generated.
+  set_source_files_properties("${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc"
+    PROPERTIES GENERATED TRUE
+               HEADER_FILE_ONLY TRUE)
+
+  # 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")
+  set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc")
+else()
+  set(version_inc)
+endif()
+
 add_clang_library(clangBasic
   Attributes.cpp
   Builtins.cpp
@@ -29,30 +71,6 @@ add_clang_library(clangBasic
   VersionTuple.cpp
   VirtualFileSystem.cpp
   Warnings.cpp
+  ${version_inc}
   )
 
-# Determine Subversion revision.
-# FIXME: This only gets updated when CMake is run, so this revision number
-# may be out-of-date!
-if( NOT IS_SYMLINK "${CLANG_SOURCE_DIR}" )  # See PR 8437
-  find_package(Subversion)
-endif()
-if (Subversion_FOUND AND EXISTS "${CLANG_SOURCE_DIR}/.svn")
-  set(FIRST_SOURCE_DIR ${LLVM_MAIN_SRC_DIR})
-  set(FIRST_REPOSITORY LLVM_REPOSITORY)
-  set(SECOND_SOURCE_DIR ${CLANG_SOURCE_DIR})
-  set(SECOND_REPOSITORY SVN_REPOSITORY)
-  set(HEADER_FILE ${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc)
-  include(GetSVN)
-
-  # Mark the generated header as being generated.
-  message(STATUS "Expecting header to go in ${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc")
-  set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/SVNVersion.inc
-    PROPERTIES GENERATED TRUE
-               HEADER_FILE_ONLY TRUE)
-
-  # 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")
-
-endif()