std::ofstream tracing_file;
-#define OPT_TRACING_BASIC "tracing/basic"
-#define OPT_TRACING_COMMENT_FILE "tracing/comment-file"
-#define OPT_TRACING_DISABLE_DESTROY "tracing/disable-destroy"
-#define OPT_TRACING_FORMAT_TI_ONEFILE "tracing/smpi/format/ti-one-file"
-#define OPT_TRACING_SMPI_INTERNALS "tracing/smpi/internals"
-#define OPT_TRACING_SMPI "tracing/smpi"
-#define OPT_TRACING_TOPOLOGY "tracing/platform/topology"
+constexpr char OPT_TRACING_BASIC[] = "tracing/basic";
+constexpr char OPT_TRACING_COMMENT_FILE[] = "tracing/comment-file";
+constexpr char OPT_TRACING_DISABLE_DESTROY[] = "tracing/disable-destroy";
+constexpr char OPT_TRACING_FORMAT_TI_ONEFILE[] = "tracing/smpi/format/ti-one-file";
+constexpr char OPT_TRACING_SMPI[] = "tracing/smpi";
+constexpr char OPT_TRACING_TOPOLOGY[] = "tracing/platform/topology";
static simgrid::config::Flag<bool> trace_enabled{
"tracing", "Enable the tracing system. You have to enable this option to use other tracing options.", false};