diff --git a/CMakeLists.txt b/CMakeLists.txt
index d79bbbc..9e5aa9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -140,7 +140,17 @@ find_package (Qt5Test 5.6 QUIET)
 if (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
    #
    # Uncomment to compile everything with aggressively pedantic options
-   # (not recommended -- only for testing -- also not portable)
+   # (not recommended -- only for testing)
+   #
+   #add_compile_options("-Wall" "-Wextra" "-Wpedantic" "-Wno-unused-parameter" "-Werror")
+
+   # Uncomment to always compile with debug symbols
+   add_compile_options("-g")
+endif ()
+if (${CMAKE_CXX_COMPILER_ID} MATCHES "^.*Clang$")  # "Clang", "AppleClang", etc.
+   #
+   # Uncomment to compile everything with aggressively pedantic options
+   # (not recommended -- only for testing)
    #
    #add_compile_options("-Wall" "-Wextra" "-Wpedantic" "-Wno-unused-parameter" "-Werror")
 
diff --git a/backends/barcode/Zint.cpp b/backends/barcode/Zint.cpp
index bcfc62d..c6f8b31 100644
--- a/backends/barcode/Zint.cpp
+++ b/backends/barcode/Zint.cpp
@@ -28,9 +28,6 @@
 
 namespace
 {
-	const double FONT_SCALE = 0.9;
-	const int W_PTS_DEFAULT = 144;
-	const int H_PTS_DEFAULT = 72;
 	const double TWO_DIVIDED_BY_SQRT3 = 1.15470053837925152902;
 }
 
diff --git a/glabels/ColorPaletteItem.cpp b/glabels/ColorPaletteItem.cpp
index 7b4e4f8..e62c8df 100644
--- a/glabels/ColorPaletteItem.cpp
+++ b/glabels/ColorPaletteItem.cpp
@@ -36,8 +36,6 @@ namespace glabels
 		const int     wSwatch = 25;
 		const int     hSwatch = 25;
 
-		const int     hoverBgOutlineWidthPixels = 1;
-
 		const int     outlineWidthPixels = 1;
 	}
 
diff --git a/glabels/LabelEditor.cpp b/glabels/LabelEditor.cpp
index 8c8db9d..34e8ad1 100644
--- a/glabels/LabelEditor.cpp
+++ b/glabels/LabelEditor.cpp
@@ -823,7 +823,8 @@ namespace glabels
 		/*
 		 * Calculate new size
 		 */
-		double w, h;
+		double w = 0.0;
+		double h = 0.0;
 		switch ( mResizeHandleLocation )
 		{
 		case model::Handle::NW:
diff --git a/glabels/TemplatePicker.cpp b/glabels/TemplatePicker.cpp
index bc90f96..4fa3791 100644
--- a/glabels/TemplatePicker.cpp
+++ b/glabels/TemplatePicker.cpp
@@ -130,7 +130,7 @@ namespace glabels
 	{
 		model::Settings::setTemplatePickerMode( mode );
 		
-		for ( unsigned int i = 0; i < count(); i++ )
+		for ( int i = 0; i < count(); i++ )
 		{
 			if (auto* tItem = dynamic_cast<TemplatePickerItem *>(item(i)))
 			{
@@ -182,7 +182,7 @@ namespace glabels
 	                                  bool isoMask, bool usMask, bool otherMask,
 	                                  bool anyCategory, const QStringList& categoryIds )
 	{
-		for ( unsigned int i = 0; i < count(); i++ )
+		for ( int i = 0; i < count(); i++ )
 		{
 			if (auto* tItem = dynamic_cast<TemplatePickerItem *>(item(i)))
 			{
@@ -232,7 +232,7 @@ namespace glabels
 	///
 	void TemplatePicker::applyFilter( const QStringList& names )
 	{
-		for ( unsigned int i = 0; i < count(); i++ )
+		for ( int i = 0; i < count(); i++ )
 		{
 			if (auto *tItem = dynamic_cast<TemplatePickerItem *>(item(i)))
 			{
diff --git a/model/Distance.cpp b/model/Distance.cpp
index aa46073..e7c631e 100644
--- a/model/Distance.cpp
+++ b/model/Distance.cpp
@@ -149,6 +149,9 @@ namespace glabels
 			case Units::PC:
 				d = pc();
 				break;
+			default:
+				d = mDPts;
+				break;
 			}
 
 			return d;
@@ -176,6 +179,9 @@ namespace glabels
 			case Units::PC:
 				d = pc();
 				break;
+			default:
+				d = mDPts;
+				break;
 			}
 
 			return d;
diff --git a/model/ParserState.cpp b/model/ParserState.cpp
index 725eef0..2e3dbe4 100644
--- a/model/ParserState.cpp
+++ b/model/ParserState.cpp
@@ -30,7 +30,7 @@ namespace glabels
 	{
 
 		ParserState::ParserState( const QString& string,
-		                          unsigned int   pos )
+		                          qsizetype      pos )
 			: mString(&string),
 			  mPos( pos )
 		{
@@ -38,7 +38,7 @@ namespace glabels
 
 
 		QChar
-		ParserState::operator[]( unsigned int i ) const
+		ParserState::operator[]( qsizetype i ) const
 		{
 			auto ii = mPos + i;
 			if ( ii < mString->size() )
@@ -55,7 +55,7 @@ namespace glabels
 		bool
 		ParserState::isNextSubString( const QString& s ) const
 		{
-			for ( unsigned int i = 0; i < s.size(); i++ )
+			for ( qsizetype i = 0; i < s.size(); i++ )
 			{
 				if ( operator[](i) != s[i] ) return false;
 			}
@@ -78,7 +78,7 @@ namespace glabels
 
 
 		void
-		ParserState::advanceChars( unsigned int i )
+		ParserState::advanceChars( qsizetype i )
 		{
 			mPos = std::min( mPos + i, mString->size() );
 		}
diff --git a/model/ParserState.h b/model/ParserState.h
index d1c15d5..c74a0df 100644
--- a/model/ParserState.h
+++ b/model/ParserState.h
@@ -35,15 +35,15 @@ namespace glabels
 		public:
 			ParserState() = default;
 			ParserState( const QString& string,
-			             unsigned int   pos = 0 );
+			             qsizetype      pos = 0 );
 			~ParserState() = default;
 
-			QChar operator[]( unsigned int i ) const;
+			QChar operator[]( qsizetype i ) const;
 			bool isNextSubString( const QString& s ) const;
 			qsizetype pos() const;
 			qsizetype charsLeft() const;
 
-			void advanceChars( unsigned int i );
+			void advanceChars( qsizetype i );
 
 
 		private:
diff --git a/model/Units.cpp b/model/Units.cpp
index 2085f30..fb4cc76 100644
--- a/model/Units.cpp
+++ b/model/Units.cpp
@@ -142,6 +142,8 @@ namespace glabels
 			case Units::PC:
 				idString = "pc";
 				break;
+			default:
+				idString = "pt";
 			}
 
 			return idString;
@@ -169,6 +171,8 @@ namespace glabels
 			case Units::PC:
 				nameString = tr("picas");
 				break;
+			default:
+				nameString = tr("points");
 			}
 
 			return nameString;
@@ -196,6 +200,9 @@ namespace glabels
 			case Units::PC:
 				value = 0.01;
 				break;
+			default:
+				value = 0.01;
+				break;
 			}
 
 			return value;
@@ -223,6 +230,9 @@ namespace glabels
 			case Units::PC:
 				digits = 2;
 				break;
+			default:
+				digits = 2;
+				break;
 			}
 
 			return digits;
diff --git a/model/Variables.cpp b/model/Variables.cpp
index 401da56..3bfdf93 100644
--- a/model/Variables.cpp
+++ b/model/Variables.cpp
@@ -31,7 +31,8 @@ namespace glabels
 		/// Copy constructor
 		///
 		Variables::Variables( const Variables& other )
-			: QMap<QString,Variable>(other)
+			: QObject(),
+			  QMap<QString,Variable>(other)
 		{
 		}