From f7d9cf813f3bf43d06950f2fb52d749edc46e80c Mon Sep 17 00:00:00 2001
From: Richard Berger <richard.berger@temple.edu>
Date: Mon, 26 Oct 2020 17:21:52 -0400
Subject: [PATCH] Enable gathering of git info with git v1.8.3.1

The -C flag wasn't supported back then. The workaround is to change the
working directory via CMake. This issue was detected while building on
CentOS 7.
---
 cmake/Modules/generate_lmpgitversion.cmake | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/cmake/Modules/generate_lmpgitversion.cmake b/cmake/Modules/generate_lmpgitversion.cmake
index afd4447867..4ff01c7501 100644
--- a/cmake/Modules/generate_lmpgitversion.cmake
+++ b/cmake/Modules/generate_lmpgitversion.cmake
@@ -7,17 +7,20 @@ set(temp_git_info "false")
 message(STATUS "Git Directory: ${LAMMPS_DIR}/.git")
 if(GIT_FOUND AND EXISTS ${LAMMPS_DIR}/.git)
   set(temp_git_info "true")
-  execute_process(COMMAND ${GIT_EXECUTABLE} -C ${LAMMPS_DIR} rev-parse HEAD
+  execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
     OUTPUT_VARIABLE temp_git_commit
     ERROR_QUIET
+    WORKING_DIRECTORY ${LAMMPS_DIR}
     OUTPUT_STRIP_TRAILING_WHITESPACE)
-  execute_process(COMMAND ${GIT_EXECUTABLE} -C ${LAMMPS_DIR} rev-parse --abbrev-ref HEAD
+  execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref HEAD
     OUTPUT_VARIABLE temp_git_branch
     ERROR_QUIET
+    WORKING_DIRECTORY ${LAMMPS_DIR}
     OUTPUT_STRIP_TRAILING_WHITESPACE)
-  execute_process(COMMAND ${GIT_EXECUTABLE} -C ${LAMMPS_DIR} describe --dirty=-modified
+  execute_process(COMMAND ${GIT_EXECUTABLE} describe --dirty=-modified
     OUTPUT_VARIABLE temp_git_describe
     ERROR_QUIET
+    WORKING_DIRECTORY ${LAMMPS_DIR}
     OUTPUT_STRIP_TRAILING_WHITESPACE)
 endif()