From 61fd8ea5209bc246b956710e4340e419922f5c82 Mon Sep 17 00:00:00 2001
From: Jordan Rose <jordan_rose@apple.com>
Date: Wed, 19 Nov 2014 22:03:21 +0000
Subject: [PATCH] [CMake] Update GetSVN.cmake to use LLVM version control
 helper scripts.

This allows the logic to work with Git, and also uses the variable names
to match what Clang is actually looking for.

This is a re-application of r190556 and r190808. This changes the interface
of GetSVN.cmake. Clang change to follow.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222391 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/modules/GetSVN.cmake | 54 ++++++++++++++++++++++++++------------
 1 file changed, 37 insertions(+), 17 deletions(-)

diff --git a/cmake/modules/GetSVN.cmake b/cmake/modules/GetSVN.cmake
index acccc12a94e..4e32c09061e 100644
--- a/cmake/modules/GetSVN.cmake
+++ b/cmake/modules/GetSVN.cmake
@@ -2,24 +2,44 @@
 #
 # Input variables:
 #   FIRST_SOURCE_DIR  - First source directory
-#   FIRST_REPOSITORY  - The macro to define to the first revision number.
-#   SECOND_SOURCE_DIR - Second source directory
-#   SECOND_REPOSITORY - The macro to define to the second revision number.
+#   FIRST_NAME        - The macro prefix for the first repository's info
+#   SECOND_SOURCE_DIR - Second source directory (opt)
+#   SECOND_NAME       - The macro prefix for the second repository's info (opt)
 #   HEADER_FILE       - The header file to write
-include(FindSubversion)
-if (Subversion_FOUND AND EXISTS "${FIRST_SOURCE_DIR}/.svn")
-  # Repository information for the first repository.
-  Subversion_WC_INFO(${FIRST_SOURCE_DIR} MY)
-  file(WRITE ${HEADER_FILE}.txt "#define ${FIRST_REPOSITORY} \"${MY_WC_REVISION}\"\n")
+#
+# 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.
 
-  # Repository information for the second repository.
-  if (EXISTS "${SECOND_SOURCE_DIR}/.svn")
-    Subversion_WC_INFO(${SECOND_SOURCE_DIR} MY)
-    file(APPEND ${HEADER_FILE}.txt 
-      "#define ${SECOND_REPOSITORY} \"${MY_WC_REVISION}\"\n")
-  endif ()
+# 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)
 
-  # Copy the file only if it has changed.
-  execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
-    ${HEADER_FILE}.txt ${HEADER_FILE})
+# Handle strange terminals
+set(ENV{TERM} "dumb")
+
+function(append_info name path)
+  execute_process(COMMAND "${LLVM_DIR}/utils/GetSourceVersion" "${path}"
+    OUTPUT_VARIABLE revision)
+  string(STRIP "${revision}" revision)
+  execute_process(COMMAND "${LLVM_DIR}/utils/GetRepositoryPath" "${path}"
+    OUTPUT_VARIABLE repository
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  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()
+
+append_info(${FIRST_NAME} "${FIRST_SOURCE_DIR}")
+if(DEFINED SECOND_SOURCE_DIR)
+  append_info(${SECOND_NAME} "${SECOND_SOURCE_DIR}")
 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")
+