[mc] Make mc_diff_info static

diff --git a/src/mc/mc_diff.cpp b/src/mc/mc_diff.cpp
index 2abb326..782cf23 100644 (file)
--- a/src/mc/mc_diff.cpp
+++ b/src/mc/mc_diff.cpp
@@ -50,7 +50,7 @@ struct XBT_PRIVATE s_mc_diff {
 #define types1_(i,j) types1[ MAX_FRAGMENT_PER_BLOCK*(i) + (j)]
 #define types2_(i,j) types2[ MAX_FRAGMENT_PER_BLOCK*(i) + (j)]
 
-__thread struct s_mc_diff *mc_diff_info = NULL;
+static __thread struct s_mc_diff *mc_diff_info = nullptr;
 
 /*********************************** Free functions ************************************/