From d7c954ac2188c5f40fa06830badc763a7260b8b6 Mon Sep 17 00:00:00 2001
From: Ian Cullen <ian.james.cullen@gmail.com>
Date: Sun, 6 May 2018 14:42:28 +0100
Subject: [PATCH] Run git from the source directory (#589)

Git was being executed in the current directory, so could not get the
latest tag if cmake was run from a build directory. Force git to be
run from with the source directory.
---
 cmake/GetGitVersion.cmake | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cmake/GetGitVersion.cmake b/cmake/GetGitVersion.cmake
index 8dd9480045..88cebe3a1c 100644
--- a/cmake/GetGitVersion.cmake
+++ b/cmake/GetGitVersion.cmake
@@ -21,6 +21,7 @@ set(__get_git_version INCLUDED)
 function(get_git_version var)
   if(GIT_EXECUTABLE)
       execute_process(COMMAND ${GIT_EXECUTABLE} describe --match "v[0-9]*.[0-9]*.[0-9]*" --abbrev=8
+          WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
           RESULT_VARIABLE status
           OUTPUT_VARIABLE GIT_VERSION
           ERROR_QUIET)
@@ -33,9 +34,11 @@ function(get_git_version var)
 
       # Work out if the repository is dirty
       execute_process(COMMAND ${GIT_EXECUTABLE} update-index -q --refresh
+          WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
           OUTPUT_QUIET
           ERROR_QUIET)
       execute_process(COMMAND ${GIT_EXECUTABLE} diff-index --name-only HEAD --
+          WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
           OUTPUT_VARIABLE GIT_DIFF_INDEX
           ERROR_QUIET)
       string(COMPARE NOTEQUAL "${GIT_DIFF_INDEX}" "" GIT_DIRTY)