7 files changed, 7 insertions, 7 deletions
diff --git a/host/lib/rfnoc/async_msg_handler.cpp b/host/lib/rfnoc/async_msg_handler.cpp
index 6b7d7d057..0f325b450 100644
--- a/host/lib/rfnoc/async_msg_handler.cpp
+++ b/host/lib/rfnoc/async_msg_handler.cpp
@@ -56,7 +56,7 @@ public:
     {
         std::lock_guard<std::mutex> lock(_mutex);
 
-        for (auto const event_handler : _event_handlers) {
+        for (const auto& event_handler : _event_handlers) {
             // If the event code in the message matches the event code used at
             // registration time, call the event handler
             if ((metadata.event_code & event_handler.first) == event_handler.first) {
diff --git a/host/lib/rfnoc/sink_block_ctrl_base.cpp b/host/lib/rfnoc/sink_block_ctrl_base.cpp
index f1d65350a..fcd95636c 100644
--- a/host/lib/rfnoc/sink_block_ctrl_base.cpp
+++ b/host/lib/rfnoc/sink_block_ctrl_base.cpp
@@ -32,7 +32,7 @@ std::vector<size_t> sink_block_ctrl_base::get_input_ports() const
 {
     std::vector<size_t> input_ports;
     input_ports.reserve(_tree->list(_root_path / "ports" / "in").size());
-    for (const std::string port : _tree->list(_root_path / "ports" / "in")) {
+    for (const std::string& port : _tree->list(_root_path / "ports" / "in")) {
         input_ports.push_back(boost::lexical_cast<size_t>(port));
     }
     return input_ports;
diff --git a/host/lib/rfnoc/source_block_ctrl_base.cpp b/host/lib/rfnoc/source_block_ctrl_base.cpp
index 91fe705b2..4a5547379 100644
--- a/host/lib/rfnoc/source_block_ctrl_base.cpp
+++ b/host/lib/rfnoc/source_block_ctrl_base.cpp
@@ -64,7 +64,7 @@ std::vector<size_t> source_block_ctrl_base::get_output_ports() const
 {
     std::vector<size_t> output_ports;
     output_ports.reserve(_tree->list(_root_path / "ports" / "out").size());
-    for (const std::string port : _tree->list(_root_path / "ports" / "out")) {
+    for (const std::string& port : _tree->list(_root_path / "ports" / "out")) {
         output_ports.push_back(boost::lexical_cast<size_t>(port));
     }
     return output_ports;
diff --git a/host/lib/usrp/b200/b200_impl.cpp b/host/lib/usrp/b200/b200_impl.cpp
index 7cffae0ff..7c062732a 100644
--- a/host/lib/usrp/b200/b200_impl.cpp
+++ b/host/lib/usrp/b200/b200_impl.cpp
@@ -742,7 +742,7 @@ b200_impl::b200_impl(
     ////////////////////////////////////////////////////////////////////
     _radio_perifs[0].fp_gpio =
         gpio_atr_3000::make(_radio_perifs[0].ctrl, TOREG(SR_FP_GPIO), RB32_FP_GPIO);
-    for (const gpio_attr_map_t::value_type attr : gpio_attr_map) {
+    for (const gpio_attr_map_t::value_type& attr : gpio_attr_map) {
         switch (attr.first) {
             case usrp::gpio_atr::GPIO_SRC:
                 _tree
diff --git a/host/lib/usrp/dboard/db_tvrx.cpp b/host/lib/usrp/dboard/db_tvrx.cpp
index f2c795eee..fbad595f6 100644
--- a/host/lib/usrp/dboard/db_tvrx.cpp
+++ b/host/lib/usrp/dboard/db_tvrx.cpp
@@ -156,7 +156,7 @@ static const boost::array<double, 17> tvrx_gains_volts = {{0.8,
 static uhd::dict<std::string, gain_range_t> get_tvrx_gain_ranges(void)
 {
     double rfmax = 0.0, rfmin = FLT_MAX;
-    for (const std::string range : tvrx_rf_gains_db.keys()) {
+    for (const std::string& range : tvrx_rf_gains_db.keys()) {
         double my_max = tvrx_rf_gains_db[range].back(); // we're assuming it's monotonic
         double my_min =
             tvrx_rf_gains_db[range].front(); // if it's not this is wrong wrong wrong
diff --git a/host/lib/usrp/n230/n230_impl.cpp b/host/lib/usrp/n230/n230_impl.cpp
index 55aa917e0..9e4050648 100644
--- a/host/lib/usrp/n230/n230_impl.cpp
+++ b/host/lib/usrp/n230/n230_impl.cpp
@@ -426,7 +426,7 @@ void n230_impl::_initialize_property_tree(const fs_path& mb_path)
     //------------------------------------------------------------------
     // MiniSAS GPIO
     //------------------------------------------------------------------
-    for (const usrp::gpio_atr::gpio_attr_map_t::value_type attr :
+    for (const usrp::gpio_atr::gpio_attr_map_t::value_type& attr :
         usrp::gpio_atr::gpio_attr_map) {
         switch (attr.first) {
             case usrp::gpio_atr::GPIO_SRC:
diff --git a/host/lib/usrp/x300/x300_radio_ctrl_impl.cpp b/host/lib/usrp/x300/x300_radio_ctrl_impl.cpp
index 8cb80282b..93dd830b9 100644
--- a/host/lib/usrp/x300/x300_radio_ctrl_impl.cpp
+++ b/host/lib/usrp/x300/x300_radio_ctrl_impl.cpp
@@ -93,7 +93,7 @@ UHD_RFNOC_RADIO_BLOCK_CONSTRUCTOR(x300_radio_ctrl)
     if (_radio_type == PRIMARY) {
         _fp_gpio = gpio_atr::gpio_atr_3000::make(
             ctrl, regs::sr_addr(regs::FP_GPIO), regs::rb_addr(regs::RB_FP_GPIO));
-        for (const gpio_atr::gpio_attr_map_t::value_type attr : gpio_atr::gpio_attr_map) {
+        for (const gpio_atr::gpio_attr_map_t::value_type& attr : gpio_atr::gpio_attr_map) {
             switch (attr.first) {
                 case usrp::gpio_atr::GPIO_SRC:
                     _tree