diff --git a/source/Makefile.mk b/source/Makefile.mk
index 2d1988576..5dc7140d7 100644
--- a/source/Makefile.mk
+++ b/source/Makefile.mk
@@ -180,7 +180,9 @@ BASE_FLAGS += -Wmissing-declarations -Wredundant-decls
 BASE_FLAGS += -Wshadow  -Wundef -Wuninitialized -Wunused
 BASE_FLAGS += -Wstrict-aliasing -fstrict-aliasing
 BASE_FLAGS += -Wstrict-overflow -fstrict-overflow
-BASE_FLAGS += -Wduplicated-branches -Wduplicated-cond  -Wnull-dereference
+BASE_FLAGS += -Wduplicated-branches -Wduplicated-cond -Wnull-dereference
+BASE_FLAGS += -Wformat-truncation=2 -Wformat-overflow=2
+BASE_FLAGS += -Wstringop-overflow=4 -Wstringop-truncation
 CFLAGS     += -Winit-self -Wjump-misses-init -Wmissing-prototypes -Wnested-externs -Wstrict-prototypes -Wwrite-strings
 CXXFLAGS   += -Wc++0x-compat -Wc++11-compat
 CXXFLAGS   += -Wnon-virtual-dtor -Woverloaded-virtual
diff --git a/source/backend/engine/CarlaEngineNative.cpp b/source/backend/engine/CarlaEngineNative.cpp
index 473449c76..72ce4a1af 100644
--- a/source/backend/engine/CarlaEngineNative.cpp
+++ b/source/backend/engine/CarlaEngineNative.cpp
@@ -427,7 +427,7 @@ protected:
 
                 {
                     const CarlaScopedLocale csl;
-                    std::snprintf(tmpBuf, STR_MAX, "%f\n", newSampleRate);
+                    std::snprintf(tmpBuf, STR_MAX, "%.12g\n", newSampleRate);
                 }
 
                 if (fUiServer.writeMessage(tmpBuf))
@@ -537,7 +537,7 @@ protected:
             std::snprintf(tmpBuf, STR_MAX, "PARAMVAL_%u:%i\n", pluginId, i);
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
-            std::snprintf(tmpBuf, STR_MAX, "%f\n", static_cast<double>(plugin->getInternalParameterValue(i)));
+            std::snprintf(tmpBuf, STR_MAX, "%.12g\n", static_cast<double>(plugin->getInternalParameterValue(i)));
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
             fUiServer.flushMessages();
@@ -589,7 +589,7 @@ protected:
             std::snprintf(tmpBuf, STR_MAX, "PARAMETER_RANGES_%i:%i\n", pluginId, i);
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
-            std::snprintf(tmpBuf, STR_MAX, "%f:%f:%f:%f:%f:%f\n",
+            std::snprintf(tmpBuf, STR_MAX, "%.12g:%.12g:%.12g:%.12g:%.12g:%.12g\n",
                           static_cast<double>(paramRanges.def),
                           static_cast<double>(paramRanges.min),
                           static_cast<double>(paramRanges.max),
@@ -601,7 +601,7 @@ protected:
             std::snprintf(tmpBuf, STR_MAX, "PARAMVAL_%u:%u\n", pluginId, i);
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
-            std::snprintf(tmpBuf, STR_MAX, "%f\n", static_cast<double>(plugin->getParameterValue(i)));
+            std::snprintf(tmpBuf, STR_MAX, "%.12g\n", static_cast<double>(plugin->getParameterValue(i)));
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
         }
 
@@ -780,7 +780,7 @@ protected:
 
         {
             const CarlaScopedLocale csl;
-            std::snprintf(tmpBuf, STR_MAX, "%f\n", static_cast<double>(valuef));
+            std::snprintf(tmpBuf, STR_MAX, "%.12g\n", static_cast<double>(valuef));
         }
         CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
@@ -837,7 +837,7 @@ protected:
         CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage("sample-rate\n"),);
         {
             const CarlaScopedLocale csl;
-            std::snprintf(tmpBuf, STR_MAX, "%f\n", pData->sampleRate);
+            std::snprintf(tmpBuf, STR_MAX, "%.12g\n", pData->sampleRate);
         }
         CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
@@ -1380,7 +1380,7 @@ protected:
         // send engine info
 
         CARLA_SAFE_ASSERT_RETURN(fUiServer.writeAndFixMessage("runtime-info"),);
-        std::snprintf(tmpBuf, STR_MAX, "%f:0\n", static_cast<double>(getDSPLoad()));
+        std::snprintf(tmpBuf, STR_MAX, "%.12g:0\n", static_cast<double>(getDSPLoad()));
         CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
         fUiServer.flushMessages();
@@ -1398,7 +1398,7 @@ protected:
                                                                    timeInfo.bbt.beat,
                                                                    static_cast<int>(timeInfo.bbt.tick + 0.5));
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
-            std::snprintf(tmpBuf, STR_MAX, "%f\n", timeInfo.bbt.beatsPerMinute);
+            std::snprintf(tmpBuf, STR_MAX, "%.12g\n", timeInfo.bbt.beatsPerMinute);
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
         }
         else
@@ -1420,7 +1420,7 @@ protected:
 
             std::snprintf(tmpBuf, STR_MAX, "PEAKS_%i\n", i);
             CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
-            std::snprintf(tmpBuf, STR_MAX, "%f:%f:%f:%f\n",
+            std::snprintf(tmpBuf, STR_MAX, "%.12g:%.12g:%.12g:%.12g\n",
                           static_cast<double>(plugData.peaks[0]),
                           static_cast<double>(plugData.peaks[1]),
                           static_cast<double>(plugData.peaks[2]),
@@ -1436,7 +1436,7 @@ protected:
 
                 std::snprintf(tmpBuf, STR_MAX, "PARAMVAL_%u:%u\n", i, j);
                 CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
-                std::snprintf(tmpBuf, STR_MAX, "%f\n", static_cast<double>(plugin->getParameterValue(j)));
+                std::snprintf(tmpBuf, STR_MAX, "%.12g\n", static_cast<double>(plugin->getParameterValue(j)));
                 CARLA_SAFE_ASSERT_RETURN(fUiServer.writeMessage(tmpBuf),);
 
                 fUiServer.flushMessages();
diff --git a/source/backend/engine/CarlaEnginePorts.cpp b/source/backend/engine/CarlaEnginePorts.cpp
index 5ba103d64..a4e971ffd 100644
--- a/source/backend/engine/CarlaEnginePorts.cpp
+++ b/source/backend/engine/CarlaEnginePorts.cpp
@@ -102,8 +102,8 @@ void CarlaEngineCVPort::setRange(const float min, const float max) noexcept
 
     {
         const CarlaScopedLocale csl;
-        std::snprintf(strBufMin, STR_MAX-1, "%f", static_cast<double>(min));
-        std::snprintf(strBufMax, STR_MAX-1, "%f", static_cast<double>(max));
+        std::snprintf(strBufMin, STR_MAX-1, "%.12g", static_cast<double>(min));
+        std::snprintf(strBufMax, STR_MAX-1, "%.12g", static_cast<double>(max));
     }
 
     setMetaData(LV2_CORE__minimum, strBufMin, "");
diff --git a/source/backend/plugin/CarlaPlugin.cpp b/source/backend/plugin/CarlaPlugin.cpp
index fd12f8fb9..97c93b5ad 100644
--- a/source/backend/plugin/CarlaPlugin.cpp
+++ b/source/backend/plugin/CarlaPlugin.cpp
@@ -1771,7 +1771,7 @@ void CarlaPlugin::setParameterMappedRange(const uint32_t parameterId, const floa
 
     char strBuf[STR_MAX+1];
     carla_zeroChars(strBuf, STR_MAX+1);
-    std::snprintf(strBuf, STR_MAX, "%f:%f", static_cast<double>(minimum), static_cast<double>(maximum));
+    std::snprintf(strBuf, STR_MAX, "%.12g:%.12g", static_cast<double>(minimum), static_cast<double>(maximum));
 
 #ifndef BUILD_BRIDGE_ALTERNATIVE_ARCH
     pData->engine->callback(sendCallback, sendOsc,
diff --git a/source/backend/plugin/CarlaPluginBridge.cpp b/source/backend/plugin/CarlaPluginBridge.cpp
index 9f4377f9c..380710909 100644
--- a/source/backend/plugin/CarlaPluginBridge.cpp
+++ b/source/backend/plugin/CarlaPluginBridge.cpp
@@ -583,7 +583,7 @@ public:
         if (waitForParameterText())
             return true;
 
-        std::snprintf(strBuf, STR_MAX, "%f", static_cast<double>(fParams[parameterId].value));
+        std::snprintf(strBuf, STR_MAX, "%.12g", static_cast<double>(fParams[parameterId].value));
         return false;
     }
 
diff --git a/source/backend/plugin/CarlaPluginLADSPADSSI.cpp b/source/backend/plugin/CarlaPluginLADSPADSSI.cpp
index 01781474f..b2833133b 100644
--- a/source/backend/plugin/CarlaPluginLADSPADSSI.cpp
+++ b/source/backend/plugin/CarlaPluginLADSPADSSI.cpp
@@ -3111,25 +3111,25 @@ private:
     static bool _getSeparatedParameterNameOrUnitImpl(const char* const paramName, char* const strBuf,
                                                      const bool wantName, const bool useBracket) noexcept
     {
-        const char* const sepBracketStart(std::strstr(paramName, useBracket ? " [" : " ("));
+        const char* const sepBracketStart = std::strstr(paramName, useBracket ? " [" : " (");
 
         if (sepBracketStart == nullptr)
             return false;
 
-        const char* const sepBracketEnd(std::strstr(sepBracketStart, useBracket ? "]" : ")"));
+        const char* const sepBracketEnd = std::strstr(sepBracketStart, useBracket ? "]" : ")");
 
         if (sepBracketEnd == nullptr)
             return false;
 
-        const std::size_t unitSize(static_cast<std::size_t>(sepBracketEnd-sepBracketStart-2));
+        const std::size_t unitSize = static_cast<std::size_t>(sepBracketEnd-sepBracketStart-2);
 
         if (unitSize > 7) // very unlikely to have such big unit
             return false;
 
-        const std::size_t sepIndex(std::strlen(paramName)-unitSize-3);
+        const std::size_t sepIndex = std::strlen(paramName)-unitSize-3;
 
         // just in case
-        if (sepIndex+2 >= STR_MAX)
+        if (sepIndex > STR_MAX-3)
             return false;
 
         if (wantName)
diff --git a/source/backend/plugin/CarlaPluginLV2.cpp b/source/backend/plugin/CarlaPluginLV2.cpp
index afd635af9..54f40c47e 100644
--- a/source/backend/plugin/CarlaPluginLV2.cpp
+++ b/source/backend/plugin/CarlaPluginLV2.cpp
@@ -478,7 +478,7 @@ public:
         char sampleRateStr[32];
         {
             const CarlaScopedLocale csl;
-            std::snprintf(sampleRateStr, 31, "%f", kEngine->getSampleRate());
+            std::snprintf(sampleRateStr, 31, "%.12g", kEngine->getSampleRate());
         }
         sampleRateStr[31] = '\0';
 
@@ -1580,7 +1580,7 @@ public:
                     if (! fPipeServer.writeMessage(tmpBuf))
                         return;
 
-                    std::snprintf(tmpBuf, 0xff, "%f\n", static_cast<double>(pData->engine->getOptions().uiScale));
+                    std::snprintf(tmpBuf, 0xff, "%.12g\n", static_cast<double>(pData->engine->getOptions().uiScale));
                     if (! fPipeServer.writeMessage(tmpBuf))
                         return;
 
@@ -1611,7 +1611,7 @@ public:
                         if (! fPipeServer.writeMessage(tmpBuf))
                             return;
 
-                        std::snprintf(tmpBuf, 0xff, "%f\n", static_cast<double>(getParameterValue(i)));
+                        std::snprintf(tmpBuf, 0xff, "%.12g\n", static_cast<double>(getParameterValue(i)));
                         if (! fPipeServer.writeMessage(tmpBuf))
                             return;
                     }
diff --git a/source/backend/plugin/CarlaPluginVST2.cpp b/source/backend/plugin/CarlaPluginVST2.cpp
index 2e6379e05..e13ef0dd4 100644
--- a/source/backend/plugin/CarlaPluginVST2.cpp
+++ b/source/backend/plugin/CarlaPluginVST2.cpp
@@ -339,7 +339,7 @@ public:
         dispatcher(effGetParamDisplay, static_cast<int32_t>(parameterId), 0, strBuf);
 
         if (strBuf[0] == '\0')
-            std::snprintf(strBuf, STR_MAX, "%f", static_cast<double>(getParameterValue(parameterId)));
+            std::snprintf(strBuf, STR_MAX, "%.12g", static_cast<double>(getParameterValue(parameterId)));
 
         return true;
     }
diff --git a/source/modules/rtaudio/RtAudio.h b/source/modules/rtaudio/RtAudio.h
index 289e254c1..4f323b01d 100644
--- a/source/modules/rtaudio/RtAudio.h
+++ b/source/modules/rtaudio/RtAudio.h
@@ -113,7 +113,7 @@ static const RtAudioFormat RTAUDIO_FLOAT64 = 0x20; // Normalized between plus/mi
     open the input and/or output stream device(s) for exclusive use.
     Note that this is not possible with all supported audio APIs.
 
-    If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt 
+    If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
     to select realtime scheduling (round-robin) for the callback thread.
 
     If the RTAUDIO_ALSA_USE_DEFAULT flag is set, RtAudio will attempt to
@@ -347,7 +347,7 @@ class RTAUDIO_DLL_PUBLIC RtAudio
     open the input and/or output stream device(s) for exclusive use.
     Note that this is not possible with all supported audio APIs.
 
-    If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt 
+    If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
     to select realtime scheduling (round-robin) for the callback thread.
     The \c priority parameter will only be used if the RTAUDIO_SCHEDULE_REALTIME
     flag is set. It defines the thread's realtime priority.
@@ -416,7 +416,7 @@ class RTAUDIO_DLL_PUBLIC RtAudio
   /*!
     This function performs a system query of available devices each time it
     is called, thus supporting devices connected \e after instantiation. If
-    a system error occurs during processing, a warning will be issued. 
+    a system error occurs during processing, a warning will be issued.
   */
   unsigned int getDeviceCount( void );
 
@@ -483,7 +483,7 @@ class RTAUDIO_DLL_PUBLIC RtAudio
            from within the callback function.
     \param options An optional pointer to a structure containing various
            global stream options, including a list of OR'ed RtAudioStreamFlags
-           and a suggested number of stream buffers that can be used to 
+           and a suggested number of stream buffers that can be used to
            control stream latency.  More buffers typically result in more
            robust performance, though at a cost of greater latency.  If a
            value of zero is specified, a system-specific median value is
@@ -658,7 +658,9 @@ class S24 {
     return *this;
   }
 
+#if defined(__GNUC__) && __GNUC__ < 8
   S24( const S24& v ) { *this = v; }
+#endif
   S24( const double& d ) { *this = (int) d; }
   S24( const float& f ) { *this = (int) f; }
   S24( const signed short& s ) { *this = (int) s; }
@@ -792,7 +794,7 @@ protected:
     "warning" message is reported and FAILURE is returned. A
     successful probe is indicated by a return value of SUCCESS.
   */
-  virtual bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels, 
+  virtual bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int *bufferSize,
                                 RtAudio::StreamOptions *options );
@@ -884,7 +886,7 @@ public:
 
   private:
 
-  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels, 
+  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                         unsigned int firstChannel, unsigned int sampleRate,
                         RtAudioFormat format, unsigned int *bufferSize,
                         RtAudio::StreamOptions *options );
@@ -921,7 +923,7 @@ public:
 
   private:
 
-  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels, 
+  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                         unsigned int firstChannel, unsigned int sampleRate,
                         RtAudioFormat format, unsigned int *bufferSize,
                         RtAudio::StreamOptions *options );
@@ -959,7 +961,7 @@ public:
   std::vector<RtAudio::DeviceInfo> devices_;
   void saveDeviceInfo( void );
   bool coInitialized_;
-  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels, 
+  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                         unsigned int firstChannel, unsigned int sampleRate,
                         RtAudioFormat format, unsigned int *bufferSize,
                         RtAudio::StreamOptions *options );
@@ -998,7 +1000,7 @@ public:
   bool buffersRolling;
   long duplexPrerollBytes;
   std::vector<struct DsDevice> dsDevices;
-  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels, 
+  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                         unsigned int firstChannel, unsigned int sampleRate,
                         RtAudioFormat format, unsigned int *bufferSize,
                         RtAudio::StreamOptions *options );
@@ -1069,7 +1071,7 @@ public:
 
   std::vector<RtAudio::DeviceInfo> devices_;
   void saveDeviceInfo( void );
-  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels, 
+  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                         unsigned int firstChannel, unsigned int sampleRate,
                         RtAudioFormat format, unsigned int *bufferSize,
                         RtAudio::StreamOptions *options );
@@ -1133,7 +1135,7 @@ public:
 
   private:
 
-  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels, 
+  bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                         unsigned int firstChannel, unsigned int sampleRate,
                         RtAudioFormat format, unsigned int *bufferSize,
                         RtAudio::StreamOptions *options );
@@ -1158,7 +1160,7 @@ public:
 
   private:
 
-  bool probeDeviceOpen( unsigned int /*device*/, StreamMode /*mode*/, unsigned int /*channels*/, 
+  bool probeDeviceOpen( unsigned int /*device*/, StreamMode /*mode*/, unsigned int /*channels*/,
                         unsigned int /*firstChannel*/, unsigned int /*sampleRate*/,
                         RtAudioFormat /*format*/, unsigned int * /*bufferSize*/,
                         RtAudio::StreamOptions * /*options*/ ) { return false; }
diff --git a/source/native-plugins/midi-base.hpp b/source/native-plugins/midi-base.hpp
index 165601252..444189cce 100644
--- a/source/native-plugins/midi-base.hpp
+++ b/source/native-plugins/midi-base.hpp
@@ -302,7 +302,7 @@ public:
             const RawMidiEvent* const rawMidiEvent(it.getValue(nullptr));
             CARLA_SAFE_ASSERT_CONTINUE(rawMidiEvent != nullptr);
 
-            wrtn = std::snprintf(dataWrtn, maxTimeSize+4, P_INT64 ":%i:", rawMidiEvent->time, rawMidiEvent->size);
+            wrtn = std::snprintf(dataWrtn, maxTimeSize+6, P_UINT64 ":%u:", rawMidiEvent->time, rawMidiEvent->size);
             CARLA_SAFE_ASSERT_BREAK(wrtn > 0);
             dataWrtn += wrtn;
 
diff --git a/source/native-plugins/midi-pattern.cpp b/source/native-plugins/midi-pattern.cpp
index 2731ac2bd..d5a3677a6 100644
--- a/source/native-plugins/midi-pattern.cpp
+++ b/source/native-plugins/midi-pattern.cpp
@@ -312,7 +312,7 @@ protected:
 
             {
                 const CarlaScopedLocale csl;
-                std::snprintf(strBuf, 0xff, "%f\n", beatsPerMinute);
+                std::snprintf(strBuf, 0xff, "%.12g\n", beatsPerMinute);
             }
 
             CARLA_SAFE_ASSERT_RETURN(writeMessage(strBuf),);
diff --git a/source/plugin/carla-lv2-ui.cpp b/source/plugin/carla-lv2-ui.cpp
index d7e3c52c2..f3d9dc29a 100644
--- a/source/plugin/carla-lv2-ui.cpp
+++ b/source/plugin/carla-lv2-ui.cpp
@@ -139,7 +139,7 @@ public:
 
             {
                 const CarlaScopedLocale csl;
-                std::snprintf(msg, 127, "control %u %f", portIndex, static_cast<double>(*valuePtr));
+                std::snprintf(msg, 127, "control %u %.12g", portIndex, static_cast<double>(*valuePtr));
             }
 
             msg[127] = '\0';
diff --git a/source/utils/CarlaPipeUtils.cpp b/source/utils/CarlaPipeUtils.cpp
index 5334100d3..a9a1d24ed 100644
--- a/source/utils/CarlaPipeUtils.cpp
+++ b/source/utils/CarlaPipeUtils.cpp
@@ -984,7 +984,7 @@ void CarlaPipeCommon::writeControlMessage(const uint32_t index, const float valu
 
     {
         const CarlaScopedLocale csl;
-        std::snprintf(tmpBuf, 0xff, "%f\n", static_cast<double>(value));
+        std::snprintf(tmpBuf, 0xff, "%.12g\n", static_cast<double>(value));
     }
 
     if (! _writeMsgBuffer(tmpBuf, std::strlen(tmpBuf)))
diff --git a/source/utils/CarlaString.hpp b/source/utils/CarlaString.hpp
index 16bb14ec4..b39d28d68 100644
--- a/source/utils/CarlaString.hpp
+++ b/source/utils/CarlaString.hpp
@@ -179,7 +179,7 @@ public:
 
         {
             const CarlaScopedLocale csl;
-            std::snprintf(strBuf, 0xff, "%f", static_cast<double>(value));
+            std::snprintf(strBuf, 0xff, "%.12g", static_cast<double>(value));
         }
 
         strBuf[0xff] = '\0';
@@ -199,7 +199,7 @@ public:
 
         {
             const CarlaScopedLocale csl;
-            std::snprintf(strBuf, 0xff, "%f", value);
+            std::snprintf(strBuf, 0xff, "%.24g", value);
         }
 
         strBuf[0xff] = '\0';