some cleanup in logger

bench/latency.cpp

@@ -38,6 +38,7 @@ void prepare_logdir()
 
 void bench_c_string(benchmark::State &state, std::shared_ptr<spdlog::logger> logger)
 {
+    logger->enable_backtrace(64);
     const char *msg = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum pharetra metus cursus "
                       "lacus placerat congue. Nulla egestas, mauris a tincidunt tempus, enim lectus volutpat mi, eu consequat sem "
                       "libero nec massa. In dapibus ipsum a diam rhoncus gravida. Etiam non dapibus eros. Donec fringilla dui sed "
@@ -52,6 +53,7 @@ void bench_c_string(benchmark::State &state, std::shared_ptr<spdlog::logger> log
 
 void bench_logger(benchmark::State &state, std::shared_ptr<spdlog::logger> logger)
 {
+    logger->enable_backtrace(64);
     int i = 0;
     for (auto _ : state)
     {
@@ -61,6 +63,7 @@ void bench_logger(benchmark::State &state, std::shared_ptr<spdlog::logger> logge
 
 void bench_disabled_macro(benchmark::State &state, std::shared_ptr<spdlog::logger> logger)
 {
+    logger->enable_backtrace(64);
     int i = 0;
     benchmark::DoNotOptimize(i);      // prevent unused warnings
     benchmark::DoNotOptimize(logger); // prevent unused warnings

include/spdlog/logger-inl.h

@@ -138,7 +138,7 @@ SPDLOG_INLINE void logger::enable_backtrace(size_t n_messages)
 {
     if (!backtrace_sink_)
     {
-        backtrace_sink_ = std::make_shared<sinks::backtrace_sink_mt>((std::move(sinks_), level(), n_messages));
+        backtrace_sink_ = std::make_shared<sinks::backtrace_sink_mt>(std::move(sinks_), level(), n_messages);
         sinks().push_back(backtrace_sink_);
         level_.store(level::trace); // pass all messages to the backtrace sink.
     }