[x265] [PATCH] cmake: use CMAKE_CURRENT_SOURCE_DIR as location to run hg commands find a version

[gopu at multicorewareinc.com]

# HG changeset patch
# User Gopu Govindaswamy <gopu at multicorewareinc.com>
# Date 1427272103 -19800
#      Wed Mar 25 13:58:23 2015 +0530
# Node ID 3a68c8aa4bb993032a5ad5dc765c6ceac46ce507
# Parent  e637273e2ae6391d43a037d9a4298a8be8e178ad
cmake: use CMAKE_CURRENT_SOURCE_DIR as location to run hg commands find a version

diff -r e637273e2ae6 -r 3a68c8aa4bb9 source/cmake/version.cmake
--- a/source/cmake/version.cmake	Tue Mar 24 15:31:05 2015 -0500
+++ b/source/cmake/version.cmake	Wed Mar 25 13:58:23 2015 +0530
@@ -10,9 +10,9 @@
 set(X265_LATEST_TAG "0.0")
 set(X265_TAG_DISTANCE "0")
 
-if(EXISTS ${CMAKE_SOURCE_DIR}/../.hg_archival.txt)
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../.hg_archival.txt)
     # read the lines of the archive summary file to extract the version
-    file(READ ${CMAKE_SOURCE_DIR}/../.hg_archival.txt archive)
+    file(READ ${CMAKE_CURRENT_SOURCE_DIR}/../.hg_archival.txt archive)
     STRING(REGEX REPLACE "\n" ";" archive "${archive}")
     foreach(f ${archive})
         string(FIND "${f}" ": " pos)
@@ -29,7 +29,7 @@
         string(SUBSTRING "${hg_node}" 0 16 hg_id)
         set(X265_VERSION "${hg_latesttag}+${hg_latesttagdistance}-${hg_id}")
     endif()
-elseif(HG_EXECUTABLE AND EXISTS ${CMAKE_SOURCE_DIR}/../.hg)
+elseif(HG_EXECUTABLE AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../.hg)
     if(EXISTS "${HG_EXECUTABLE}.bat")
         # mercurial source installs on Windows require .bat extension
         set(HG_EXECUTABLE "${HG_EXECUTABLE}.bat")
@@ -38,14 +38,14 @@
 
     execute_process(COMMAND
         ${HG_EXECUTABLE} log -r. --template "{latesttag}"
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
         OUTPUT_VARIABLE X265_LATEST_TAG
         ERROR_QUIET
         OUTPUT_STRIP_TRAILING_WHITESPACE
         )
     execute_process(COMMAND
         ${HG_EXECUTABLE} log -r. --template "{latesttagdistance}"
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
         OUTPUT_VARIABLE X265_TAG_DISTANCE
         ERROR_QUIET
         OUTPUT_STRIP_TRAILING_WHITESPACE
@@ -53,7 +53,7 @@
     execute_process(
         COMMAND
         ${HG_EXECUTABLE} log -r. --template "{node|short}"
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
         OUTPUT_VARIABLE HG_REVISION_ID
         ERROR_QUIET
         OUTPUT_STRIP_TRAILING_WHITESPACE
@@ -67,11 +67,11 @@
     else()
         set(X265_VERSION "${X265_LATEST_TAG}+${X265_TAG_DISTANCE}-${HG_REVISION_ID}")
     endif()
-elseif(GIT_EXECUTABLE AND EXISTS ${CMAKE_SOURCE_DIR}/../.git)
+elseif(GIT_EXECUTABLE AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../.git)
     execute_process(
         COMMAND
         ${GIT_EXECUTABLE} describe --tags --abbrev=0
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
         OUTPUT_VARIABLE X265_LATEST_TAG
         ERROR_QUIET
         OUTPUT_STRIP_TRAILING_WHITESPACE
@@ -80,7 +80,7 @@
     execute_process(
         COMMAND
         ${GIT_EXECUTABLE} describe --tags
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
         OUTPUT_VARIABLE X265_VERSION
         ERROR_QUIET
         OUTPUT_STRIP_TRAILING_WHITESPACE