Subzero: Include commit count in revision string.

CMakeLists.txt

Index: CMakeLists.txt
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 542171d0a1e72d23aaa6cf8994e1a8fbc9ea2991..3c7b3afe98d354c237ce46c70553514b99703c51 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,9 +52,14 @@ endif()
 
 execute_process(COMMAND git rev-parse HEAD
   WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-  OUTPUT_VARIABLE SUBZERO_REVISION
+  OUTPUT_VARIABLE SZ_GIT_HASH
   OUTPUT_STRIP_TRAILING_WHITESPACE
   )
-add_definitions(-DSUBZERO_REVISION=${SUBZERO_REVISION})
+execute_process(COMMAND git rev-list --count HEAD
+  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  OUTPUT_VARIABLE SZ_COMMIT_COUNT
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+add_definitions(-DSUBZERO_REVISION=${SZ_COMMIT_COUNT}_${SZ_GIT_HASH})
 
 target_link_libraries(pnacl-sz pthread)