[Basic] Update CMakeLists.txt to handle repo

Summary:
The find_first_existing_file and find_first_existing_vc_file macros in
lib/Basic/CMakeLists.txt are removed. The macros are also defined in
{LLVM}/cmake/modules/AddLLVM.cmake for the same purpose. This change
serves the following 2 objectives:

    1. To remove the redundant code in clang to use the same
       macros in llvm,
    2. The macros in AddLLVM.cmake can also handle repo for
       displaying correct version information.

Reviewers: jordan_rose, cfe-commits, modocache, hintonda

Reviewed By: hintonda

Subscribers: mgorny

Differential Revision: https://reviews.llvm.org/D35533

llvm-svn: 312865

1 files changed, 0 insertions, 33 deletions

diff --git a/clang/lib/Basic/CMakeLists.txt b/clang/lib/Basic/CMakeLists.txt
index c9f8898cec0..2bec0e83ae9 100644
--- a/clang/lib/Basic/CMakeLists.txt
+++ b/clang/lib/Basic/CMakeLists.txt
@@ -4,39 +4,6 @@ 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()
-
-macro(find_first_existing_vc_file out_var path)
-  set(git_path "${path}/.git")
-
-  # Normally '.git' is a directory that contains a 'logs/HEAD' file that
-  # is updated as modifications are made to the repository. In case the
-  # repository is a Git submodule, '.git' is a file that contains text that
-  # indicates where the repository's Git directory exists.
-  if (EXISTS "${git_path}" AND NOT IS_DIRECTORY "${git_path}")
-    FILE(READ "${git_path}" file_contents)
-    if("${file_contents}" MATCHES "^gitdir: ([^\n]+)")
-      # '.git' is indeed a link to the submodule's Git directory.
-      # Use the path to that Git directory.
-      set(git_path "${path}/${CMAKE_MATCH_1}")
-    endif()
-  endif()
-
-  find_first_existing_file(${out_var}
-    "${git_path}/logs/HEAD"  # Git or Git submodule
-    "${path}/.svn/wc.db"     # SVN 1.7
-    "${path}/.svn/entries"   # SVN 1.6
-    )
-endmacro()
-
 find_first_existing_vc_file(llvm_vc "${LLVM_MAIN_SRC_DIR}")
 find_first_existing_vc_file(clang_vc "${CLANG_SOURCE_DIR}")