From 6c5856ce093819bfcfc34ab308a63349aaa54dc4 Mon Sep 17 00:00:00 2001
From: Dominik Thoennes <dominik.thoennes@fau.de>
Date: Sun, 28 Jan 2018 20:12:11 +0100
Subject: [PATCH] change back to String but use Force

---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index acfc2e964..583c5bb4e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -815,7 +815,7 @@ endif ( )
 # OpenMPI 3.0 and higher checks the number of processes against the number of CPUs
 execute_process(COMMAND ${MPIEXEC} --version RESULT_VARIABLE mpi_version_result OUTPUT_VARIABLE mpi_version_output)
 if (mpi_version_result EQUAL 0 AND mpi_version_output MATCHES "\\(Open(RTE| MPI)\\) ([3-9]\\.|1[0-9])")
-   list ( APPEND MPIEXEC_PREFLAGS "-oversubscribe" )
+    set ( MPIEXEC_PREFLAGS "${MPIEXEC_PREFLAGS}" "-oversubscribe" CACHE STRING "" FORCE)
 endif()
 ############################################################################################################################
 
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