From c1800d25241922f95e9aff8f72126e569d5134bf 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.

llvm-svn: 222391
---
 llvm/cmake/modules/GetSVN.cmake | 54 ++++++++++++++++++++++++++++-------------
 1 file changed, 37 insertions(+), 17 deletions(-)

diff --git a/llvm/cmake/modules/GetSVN.cmake b/llvm/cmake/modules/GetSVN.cmake
index acccc12..4e32c09 100644
--- a/llvm/cmake/modules/GetSVN.cmake
+++ b/llvm/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.
+
+# 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")
 
-  # 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 ()
+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()
 
-  # Copy the file only if it has changed.
-  execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
-    ${HEADER_FILE}.txt ${HEADER_FILE})
+append_info(${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")
+
-- 
2.7.4