From b7b7fd1ee724b8831bb9a870efa76a26a8d080a8 Mon Sep 17 00:00:00 2001
From: Jacob Alexander <haata@kiibohd.com>
Date: Wed, 31 Aug 2016 02:41:55 +0000
Subject: [PATCH] Adding support for ancient git (1.7.1) found on CentOS 6.8

- Recently added the BCD_VERSION which uses git rev-list --count HEAD command
- Unfortunately git 1.7.1 doesn't have this, so I've added a fallback to manually counting the commits using some CMake magic
---
 Lib/CMake/buildinfo.cmake | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Lib/CMake/buildinfo.cmake b/Lib/CMake/buildinfo.cmake
index 3a115c2..7eee884 100644
--- a/Lib/CMake/buildinfo.cmake
+++ b/Lib/CMake/buildinfo.cmake
@@ -80,8 +80,28 @@ execute_process ( COMMAND ${GIT_EXECUTABLE} rev-list --count HEAD
 	OUTPUT_VARIABLE Git_Commit_Number
 	ERROR_QUIET
 	OUTPUT_STRIP_TRAILING_WHITESPACE
+	RESULT_VARIABLE res_var
 )
 
+#| Older versions of git (e.g. 1.7.1) dont' like rev-list --count
+#| If there's an error, try again with a less efficient version
+if ( NOT "${res_var}" STREQUAL "0" )
+	execute_process ( COMMAND ${GIT_EXECUTABLE} log --pretty=oneline
+		WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+		OUTPUT_VARIABLE Git_Log_Lines
+		OUTPUT_STRIP_TRAILING_WHITESPACE
+		RESULT_VARIABLE res_var
+	)
+
+	# Now we do some CMake wizardry to split lines in the variable so we have a list called contents
+	string ( REGEX REPLACE ";" "\\\\;" contents "${Git_Log_Lines}" )
+	string ( REGEX REPLACE "\n" ";" contents "${contents}" )
+
+	# Now we just have to measure the length of the list
+	list ( LENGTH contents Git_Commit_Number )
+endif ()
+
+
 #| Origin URL
 execute_process ( COMMAND ${GIT_EXECUTABLE} config --get remote.origin.url
 	WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}