[CMAKE] Move version control macros to AddLLVM.cmake so they can be reused by clang, etc.
Summary:
Move version control macros, find_first_existing_file and
find_first_existing_vc_file to AddLLVM.cmake so they can be reused by sub projects
like clang.
Differential Revision: https://reviews.llvm.org/D36971
llvm-svn: 312419
diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index 6141786..93a5525 100644
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -1499,3 +1499,36 @@
set(sandbox_command "sandbox-exec -p '(version 1) (allow default) ${deny_attributes_gen} ${deny_intrinsics_gen}'")
set_target_properties(${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" "")
+ endif()
+ else()
+ find_first_existing_file(${out_var}
+ "${path}/.svn/wc.db" # SVN 1.7
+ "${path}/.svn/entries" # SVN 1.6
+ )
+ endif()
+endmacro()