diff --git a/uppsrc/Core/Core.h b/uppsrc/Core/Core.h
index 6408cccd9..5cc6bace1 100644
--- a/uppsrc/Core/Core.h
+++ b/uppsrc/Core/Core.h
@@ -231,7 +231,9 @@
 enum
 {
 	INVALID_SOCKET = -1,
+#ifndef TCP_NODELAY // macos defines it as macro, with the same value 1
 	TCP_NODELAY    = 1,
+#endif
 	SD_RECEIVE     = 0,
 	SD_SEND        = 1,
 	SD_BOTH        = 2,
diff --git a/uppsrc/Core/CvFlt.cpp b/uppsrc/Core/CvFlt.cpp
index ee5a9adcf..188411d9b 100644
--- a/uppsrc/Core/CvFlt.cpp
+++ b/uppsrc/Core/CvFlt.cpp
@@ -85,9 +85,9 @@ void sF128::MulPow10(int powi)
 	LTIMING("MulPow10");
 	ASSERT(l == 0); // we can only do F64xF128 multiplication
 	const auto& pow10 = ipow10table[powi + 350];
-	uint64 hh, midh, midl;
+	uint64 hh, midh;
 	l = mul64(h, pow10.h, hh);
-	midl = mul64(h, pow10.l, midh);
+	mul64(h, pow10.l, midh);
 	h = hh + addc64(l, midh, 0);
 	exponent += pow10.exponent;
 	if((h & ((uint64)1 << 63)) == 0) { // renormalize
diff --git a/uppsrc/CtrlLib/Cocoa.mm b/uppsrc/CtrlLib/Cocoa.mm
index 7c0d3c59e..048f7e5d8 100644
--- a/uppsrc/CtrlLib/Cocoa.mm
+++ b/uppsrc/CtrlLib/Cocoa.mm
@@ -20,18 +20,13 @@ FileSelNative& FileSelNative::AllFilesType()
 }
 
 bool FileSelNative::Execute0(int open, const char *title)
-{	
+{
 	path.Clear();
 	Ctrl::ReleaseCtrlCapture();
 	if(!title)
 		title = open ? t_("Open") : t_("Save as");
 	CFRef<CFStringRef> mmtitle = CFStringCreateWithCString(NULL, title, kCFStringEncodingUTF8);
 
-	NSWindow *window = nil;
-	Ctrl *win = Ctrl::GetActiveWindow();
-	if(win)
-		window = (NSWindow *)win->GetNSWindow();
-	
 	if(open) {
 		NSOpenPanel *panel = [NSOpenPanel openPanel];
 		[panel setAllowsMultipleSelection: multi ? YES : NO];
diff --git a/uppsrc/RichText/TablePaint.cpp b/uppsrc/RichText/TablePaint.cpp
index 5344d8708..3d61a852e 100644
--- a/uppsrc/RichText/TablePaint.cpp
+++ b/uppsrc/RichText/TablePaint.cpp
@@ -240,7 +240,6 @@ RichCaret RichTable::GetCaret(int pos, RichContext rc) const
 	ASSERT(pos >= 0);
 	int nx = format.column.GetCount();
 	int ny = cell.GetCount();
-	int ti = 0;
 	const TabLayout& tab = Realize(rc);
 	for(int i = 0; i < ny; i++) {
 		const PaintRow& pr = tab[i];
@@ -252,7 +251,6 @@ RichCaret RichTable::GetCaret(int pos, RichContext rc) const
 				int l = cl.text.GetLength() + 1;
 				if(pos < l)
 					return cl.GetCaret(pos, pr[j].MakeRichContext(MakeRichContext(rc, pr.py)), pyy);
-				ti += cl.text.GetTableCount();
 				pos -= l;
 			}
 		}
diff --git a/uppsrc/RichText/TxtPaint.cpp b/uppsrc/RichText/TxtPaint.cpp
index 72dd501ac..39129c85d 100644
--- a/uppsrc/RichText/TxtPaint.cpp
+++ b/uppsrc/RichText/TxtPaint.cpp
@@ -162,7 +162,6 @@ void RichTxt::Paint(PageDraw& pw, RichContext& rc, const PaintInfo& _pi) const
 {
 	PaintInfo pi = _pi;
 	int parti = 0;
-	int pos = 0;
 	RichPara::Number n;
 	while(rc.py < pi.bottom && parti < part.GetCount()) {
 		if(part[parti].Is<RichTable>()) {
@@ -202,7 +201,6 @@ void RichTxt::Paint(PageDraw& pw, RichContext& rc, const PaintInfo& _pi) const
 		pi.highlightpara -= l;
 		pi.sell -= l;
 		pi.selh -= l;
-		pos += l;
 		++parti;
 	}
 }
diff --git a/uppsrc/TextDiffCtrl/TextCtrl.cpp b/uppsrc/TextDiffCtrl/TextCtrl.cpp
index c4fa7af47..bf1b9f39d 100644
--- a/uppsrc/TextDiffCtrl/TextCtrl.cpp
+++ b/uppsrc/TextDiffCtrl/TextCtrl.cpp
@@ -47,7 +47,6 @@ void TextCompareCtrl::DoSelection(int y, bool shift)
 
 void TextCompareCtrl::LeftDown(Point pt, dword keyflags)
 {
-	Size sz = GetSize();
 	DoSelection(pt.y, keyflags & K_SHIFT);
 	SetCapture();
 	SetWantFocus();
diff --git a/uppsrc/ide/Assist.cpp b/uppsrc/ide/Assist.cpp
index 5f17c510e..051052469 100644
--- a/uppsrc/ide/Assist.cpp
+++ b/uppsrc/ide/Assist.cpp
@@ -670,7 +670,6 @@ int  AssistEditor::ToUtf8x(int line, int pos)
 int AssistEditor::FromUtf8x(int line, int pos)
 { // libclang treats utf-8 bytes as whole characters
 	if(line < GetLineCount() && GetLineLength(line) < 1000) {
-		bool isutf8 = false;
 		const String& h = GetUtf8Line(line);
 		if(pos <= h.GetCount())
 			for(const char ch : h)
@@ -684,7 +683,6 @@ void AssistEditor::Assist(bool macros)
 {
 	LTIMING("Assist");
 	CloseAssist();
-	int q = GetCursor32();
 	assist_type.Clear();
 	assist_item.Clear();
 	include_assist = false;
@@ -965,7 +963,7 @@ void AssistEditor::AssistInsert()
 				ch++;
 			Remove(cl, ch - cl);
 			SetCursor(cl);
-			int n = Paste(ToUnicode(txt, CHARSET_WIN1250));
+			Paste(ToUnicode(txt, CHARSET_WIN1250));
 			if(param_count > 0) {
 				SetCursor(GetCursor32() - 1);
 				StartParamInfo(f, cl);
diff --git a/uppsrc/ide/FormatCode.cpp b/uppsrc/ide/FormatCode.cpp
index c05212d8f..a22dda922 100644
--- a/uppsrc/ide/FormatCode.cpp
+++ b/uppsrc/ide/FormatCode.cpp
@@ -518,7 +518,6 @@ void ReformatDlg::Set(Stream& in)
 	int ii = 0;
 	String master_id;
 	for(const ClangFormat& f : clang_format) {
-		int x = 0;
 		String id = f.id;
 		if(*id == ' ')
 			id = master_id + ":" + TrimBoth(id);
diff --git a/uppsrc/ide/InsertImage.cpp b/uppsrc/ide/InsertImage.cpp
index 69420b803..3e535f137 100644
--- a/uppsrc/ide/InsertImage.cpp
+++ b/uppsrc/ide/InsertImage.cpp
@@ -15,6 +15,7 @@ struct InsertImageDlg : WithInsertImageLayout<TopWindow>, Display {
 	bool warning = false;
 
 	void Paint(Draw& w, const Rect& r, const Value& q, Color ink, Color paper, dword style) const override;
+	void Paint(Draw& w) override { return TopWindow::Paint(w); } // silence clang warning
 	void Layout() override;
 	void Serialize(Stream& s) override { SerializePlacement(s); s % noupp % index; }
 	
diff --git a/uppsrc/ide/Navigator.cpp b/uppsrc/ide/Navigator.cpp
index bcb74484d..0d6dfb769 100644
--- a/uppsrc/ide/Navigator.cpp
+++ b/uppsrc/ide/Navigator.cpp
@@ -142,7 +142,6 @@ void Navigator::Navigate()
 	navigating = true;
 	int ii = list.GetCursor();
 	if(theide && ii >= 0 && ii < litem.GetCount()) {
-		int ln = GetCurrentLine() + 1;
 		const NavItem& m = *litem[ii];
 		if(m.kind == KIND_NEST) {
 			String h = m.pretty;
@@ -311,8 +310,6 @@ void Navigator::Search()
 	sortitems.Check(sorting);
 	String s = TrimBoth(~search);
 	String search_name, search_nest;
-	bool wholeclass = false;
-	bool both = false;
 	navigator_global = false;
 	if(s.Find('.') >= 0) {
 		Vector<String> h = Split((String)~search, '.');
@@ -323,12 +320,9 @@ void Navigator::Search()
 			if(h.GetCount())
 				search_nest = Join(h, "::");
 		}
-		wholeclass = *s == '.' && search_nest.GetCount();
 	}
-	else {
+	else
 		search_name = ~search;
-		both = true;
-	}
 	s = Join(Split(s, '.'), "::") + (s.EndsWith(".") ? "::" : "");
 	int lineno = StrInt(s);
 	nitem.Clear();
@@ -348,7 +342,6 @@ void Navigator::Search()
 	}
 	else
 	if(IsNull(s) && !sorting) {
-		bool sch = GetFileExt(theide->editfile) == ".sch";
 		Ide *theide = TheIde();
 		if(theide)
 			for(const AnnotationItem& m : theide->editor.annotations) {
diff --git a/uppsrc/ide/clang/Indexer.cpp b/uppsrc/ide/clang/Indexer.cpp
index bb27c3b81..b450481d8 100644
--- a/uppsrc/ide/clang/Indexer.cpp
+++ b/uppsrc/ide/clang/Indexer.cpp
@@ -179,7 +179,6 @@ void Indexer::IndexerThread()
 		Clang clang;
 		clang_CXIndex_setGlobalOptions(clang.index, CXGlobalOpt_ThreadBackgroundPriorityForIndexing);
 		int tm0 = msecs();
-		bool was_job = false; // for diagnostics
 		++running_indexers;
 		while(!Thread::IsShutdownThreads()) {
 			Job job;
@@ -190,7 +189,6 @@ void Indexer::IndexerThread()
 					job = jobs[jobi++];
 				else
 					break;
-				was_job = true;
 			}
 			
 			if(Thread::IsShutdownThreads())
diff --git a/uppsrc/ide/clang/macros.cpp b/uppsrc/ide/clang/macros.cpp
index fecc87c21..8f60c268e 100644
--- a/uppsrc/ide/clang/macros.cpp
+++ b/uppsrc/ide/clang/macros.cpp
@@ -5,6 +5,7 @@
 
 //#BLITZ_PROHIBIT
 
+#ifdef PLATFORM_WIN32
 const char umacros[] =
 R"(#define CHECK_GRID(g) 
 #define CHECK_MATRIX(g) 
@@ -816,6 +817,8 @@ R"(#define CHECK_GRID(g)
 #define _stdcall __attribute__((__stdcall__))
 #define _thiscall __attribute__((__thiscall__)))";
 
+#endif
+
 String RedefineMacros()
 {
 	String cmdline;
diff --git a/uppsrc/ide/ide.cpp b/uppsrc/ide/ide.cpp
index 36924e7de..3dbebb498 100644
--- a/uppsrc/ide/ide.cpp
+++ b/uppsrc/ide/ide.cpp
@@ -633,7 +633,6 @@ struct IndexerProgress : ImageMaker {
 void Ide::SyncClang()
 {
 	Vector<Color> a;
-	Color display_ink = Null;
 	int phase = msecs() / 30; // TODO: Use phase
 	auto AnimColor = [](int animator) {
 		return Blend(IsDarkTheme() ? GrayColor(70) : SColorLtFace(), Color(198, 170, 0), animator);