Merge changes Iac0f4ca9,I4a56efb2

* changes:
  Support BUILD_HOST_static=1 for musl and linux_bionic builds
  Support building python pars against static or shared musl libc
diff --git a/android/arch.go b/android/arch.go
index a7c62a9..6b81022 100644
--- a/android/arch.go
+++ b/android/arch.go
@@ -909,6 +909,7 @@
 			"Glibc",
 			"Musl",
 			"Linux",
+			"Host_linux",
 			"Not_windows",
 			"Arm_on_x86",
 			"Arm_on_x86_64",
@@ -930,6 +931,12 @@
 						targets = append(targets, target)
 					}
 				}
+				if os.Linux() && os.Class == Host {
+					target := "Host_linux_" + archType.Name
+					if !InList(target, targets) {
+						targets = append(targets, target)
+					}
+				}
 				if os.Bionic() {
 					target := "Bionic_" + archType.Name
 					if !InList(target, targets) {
@@ -1162,6 +1169,14 @@
 				}
 			}
 
+			if os.Linux() && os.Class == Host {
+				field := "Host_linux"
+				prefix := "target.host_linux"
+				if linuxProperties, ok := getChildPropertyStruct(ctx, targetProp, field, prefix); ok {
+					mergePropertyStruct(ctx, genProps, linuxProperties)
+				}
+			}
+
 			if os.Bionic() {
 				field := "Bionic"
 				prefix := "target.bionic"
@@ -2127,6 +2142,7 @@
 	linuxStructs := getTargetStructs(ctx, archProperties, "Linux")
 	bionicStructs := getTargetStructs(ctx, archProperties, "Bionic")
 	hostStructs := getTargetStructs(ctx, archProperties, "Host")
+	hostLinuxStructs := getTargetStructs(ctx, archProperties, "Host_linux")
 	hostNotWindowsStructs := getTargetStructs(ctx, archProperties, "Not_windows")
 
 	// For android, linux, ...
@@ -2147,6 +2163,9 @@
 		if os.Bionic() {
 			osStructs = append(osStructs, bionicStructs...)
 		}
+		if os.Linux() && os.Class == Host {
+			osStructs = append(osStructs, hostLinuxStructs...)
+		}
 
 		if os == LinuxMusl {
 			osStructs = append(osStructs, getTargetStructs(ctx, archProperties, "Musl")...)
diff --git a/android/arch_test.go b/android/arch_test.go
index 7caf837..68dc7f5 100644
--- a/android/arch_test.go
+++ b/android/arch_test.go
@@ -510,6 +510,7 @@
 				musl: { a:  ["musl"] },
 				linux_bionic: { a:  ["linux_bionic"] },
 				linux: { a:  ["linux"] },
+				host_linux: { a: ["host_linux"] },
 				linux_glibc: { a:  ["linux_glibc"] },
 				linux_musl: { a:  ["linux_musl"] },
 				windows: { a:  ["windows"], enabled: true },
@@ -566,12 +567,12 @@
 				{
 					module:   "foo",
 					variant:  "linux_glibc_x86_64",
-					property: []string{"root", "host", "linux", "glibc", "linux_glibc", "not_windows", "x86_64", "lib64", "linux_x86_64", "linux_glibc_x86_64"},
+					property: []string{"root", "host", "linux", "host_linux", "glibc", "linux_glibc", "not_windows", "x86_64", "lib64", "linux_x86_64", "linux_glibc_x86_64"},
 				},
 				{
 					module:   "foo",
 					variant:  "linux_glibc_x86",
-					property: []string{"root", "host", "linux", "glibc", "linux_glibc", "not_windows", "x86", "lib32", "linux_x86", "linux_glibc_x86"},
+					property: []string{"root", "host", "linux", "host_linux", "glibc", "linux_glibc", "not_windows", "x86", "lib32", "linux_x86", "linux_glibc_x86"},
 				},
 			},
 		},
@@ -605,12 +606,12 @@
 				{
 					module:   "foo",
 					variant:  "linux_musl_x86_64",
-					property: []string{"root", "host", "linux", "musl", "linux_glibc", "linux_musl", "not_windows", "x86_64", "lib64", "linux_x86_64", "linux_musl_x86_64", "linux_glibc_x86_64"},
+					property: []string{"root", "host", "linux", "host_linux", "musl", "linux_glibc", "linux_musl", "not_windows", "x86_64", "lib64", "linux_x86_64", "linux_musl_x86_64", "linux_glibc_x86_64"},
 				},
 				{
 					module:   "foo",
 					variant:  "linux_musl_x86",
-					property: []string{"root", "host", "linux", "musl", "linux_glibc", "linux_musl", "not_windows", "x86", "lib32", "linux_x86", "linux_musl_x86", "linux_glibc_x86"},
+					property: []string{"root", "host", "linux", "host_linux", "musl", "linux_glibc", "linux_musl", "not_windows", "x86", "lib32", "linux_x86", "linux_musl_x86", "linux_glibc_x86"},
 				},
 			},
 		},
diff --git a/java/droidstubs.go b/java/droidstubs.go
index 421737b..272cf1e 100644
--- a/java/droidstubs.go
+++ b/java/droidstubs.go
@@ -336,7 +336,9 @@
 			FlagWithArg("--hide ", "SuperfluousPrefix").
 			FlagWithArg("--hide ", "AnnotationExtraction").
 			// b/222738070
-			FlagWithArg("--hide ", "BannedThrow")
+			FlagWithArg("--hide ", "BannedThrow").
+			// b/223382732
+			FlagWithArg("--hide ", "ChangedDefault")
 	}
 }
 
diff --git a/mk2rbc/mk2rbc.go b/mk2rbc/mk2rbc.go
index 74053fe..d108a0d 100644
--- a/mk2rbc/mk2rbc.go
+++ b/mk2rbc/mk2rbc.go
@@ -465,17 +465,17 @@
 	return ctx
 }
 
-func (ctx *parseContext) lastAssignment(name string) *assignmentNode {
+func (ctx *parseContext) lastAssignment(v variable) *assignmentNode {
 	for va := ctx.varAssignments; va != nil; va = va.outer {
-		if v, ok := va.vars[name]; ok {
+		if v, ok := va.vars[v.name()]; ok {
 			return v
 		}
 	}
 	return nil
 }
 
-func (ctx *parseContext) setLastAssignment(name string, asgn *assignmentNode) {
-	ctx.varAssignments.vars[name] = asgn
+func (ctx *parseContext) setLastAssignment(v variable, asgn *assignmentNode) {
+	ctx.varAssignments.vars[v.name()] = asgn
 }
 
 func (ctx *parseContext) pushVarAssignments() {
@@ -532,7 +532,7 @@
 	if lhs == nil {
 		return []starlarkNode{ctx.newBadNode(a, "unknown variable %s", name)}
 	}
-	_, isTraced := ctx.tracedVariables[name]
+	_, isTraced := ctx.tracedVariables[lhs.name()]
 	asgn := &assignmentNode{lhs: lhs, mkValue: a.Value, isTraced: isTraced, location: ctx.errorLocation(a)}
 	if lhs.valueType() == starlarkTypeUnknown {
 		// Try to divine variable type from the RHS
@@ -565,8 +565,8 @@
 		}
 	}
 
-	asgn.previous = ctx.lastAssignment(name)
-	ctx.setLastAssignment(name, asgn)
+	asgn.previous = ctx.lastAssignment(lhs)
+	ctx.setLastAssignment(lhs, asgn)
 	switch a.Type {
 	case "=", ":=":
 		asgn.flavor = asgnSet
@@ -1268,12 +1268,12 @@
 				args: []starlarkExpr{
 					&stringLiteralExpr{literal: substParts[0]},
 					&stringLiteralExpr{literal: substParts[1]},
-					NewVariableRefExpr(v, ctx.lastAssignment(v.name()) != nil),
+					NewVariableRefExpr(v, ctx.lastAssignment(v) != nil),
 				},
 			}
 		}
 		if v := ctx.addVariable(refDump); v != nil {
-			return NewVariableRefExpr(v, ctx.lastAssignment(v.name()) != nil)
+			return NewVariableRefExpr(v, ctx.lastAssignment(v) != nil)
 		}
 		return ctx.newBadExpr(node, "unknown variable %s", refDump)
 	}
diff --git a/mk2rbc/mk2rbc_test.go b/mk2rbc/mk2rbc_test.go
index 55d48ff..556dcaa 100644
--- a/mk2rbc/mk2rbc_test.go
+++ b/mk2rbc/mk2rbc_test.go
@@ -65,6 +65,10 @@
 PRODUCT_NAME := Pixel 3
 PRODUCT_MODEL :=
 local_var = foo
+local-var-with-dashes := bar
+$(warning local-var-with-dashes: $(local-var-with-dashes))
+GLOBAL-VAR-WITH-DASHES := baz
+$(warning GLOBAL-VAR-WITH-DASHES: $(GLOBAL-VAR-WITH-DASHES))
 `,
 		expected: `load("//build/make/core:product_config.rbc", "rblf")
 
@@ -73,6 +77,10 @@
   cfg["PRODUCT_NAME"] = "Pixel 3"
   cfg["PRODUCT_MODEL"] = ""
   _local_var = "foo"
+  _local_var_with_dashes = "bar"
+  rblf.mkwarning("pixel3.mk", "local-var-with-dashes: %s" % _local_var_with_dashes)
+  g["GLOBAL-VAR-WITH-DASHES"] = "baz"
+  rblf.mkwarning("pixel3.mk", "GLOBAL-VAR-WITH-DASHES: %s" % g["GLOBAL-VAR-WITH-DASHES"])
 `,
 	},
 	{
@@ -985,6 +993,7 @@
 def init(g, handle):
   cfg = rblf.cfg(handle)
   if "hwaddress" not in cfg.get("PRODUCT_PACKAGES", []):
+    rblf.setdefault(handle, "PRODUCT_PACKAGES")
     cfg["PRODUCT_PACKAGES"] = (rblf.mkstrip("%s hwaddress" % " ".join(cfg.get("PRODUCT_PACKAGES", [])))).split()
 `,
 	},
diff --git a/mk2rbc/variable.go b/mk2rbc/variable.go
index f7adca5..6805744 100644
--- a/mk2rbc/variable.go
+++ b/mk2rbc/variable.go
@@ -88,20 +88,33 @@
 		}
 		value.emit(gctx)
 	}
-
-	switch asgn.flavor {
-	case asgnSet:
-		emitAssignment()
-	case asgnAppend:
-		emitAppend()
-	case asgnMaybeAppend:
-		// If we are not sure variable has been assigned before, emit setdefault
+	emitSetDefault := func() {
 		if pcv.typ == starlarkTypeList {
 			gctx.writef("%s(handle, %q)", cfnSetListDefault, pcv.name())
 		} else {
 			gctx.writef("cfg.setdefault(%q, %s)", pcv.name(), pcv.defaultValueString())
 		}
 		gctx.newLine()
+	}
+
+	switch asgn.flavor {
+	case asgnSet:
+		isSelfReferential := false
+		asgn.value.transform(func(expr starlarkExpr) starlarkExpr {
+			if ref, ok := expr.(*variableRefExpr); ok && ref.ref.name() == pcv.name() {
+				isSelfReferential = true
+			}
+			return nil
+		})
+		if isSelfReferential {
+			emitSetDefault()
+		}
+		emitAssignment()
+	case asgnAppend:
+		emitAppend()
+	case asgnMaybeAppend:
+		// If we are not sure variable has been assigned before, emit setdefault
+		emitSetDefault()
 		emitAppend()
 	case asgnMaybeSet:
 		gctx.writef("if cfg.get(%q) == None:", pcv.nam)
@@ -278,6 +291,14 @@
 // addVariable returns a variable with a given name. A variable is
 // added if it does not exist yet.
 func (ctx *parseContext) addVariable(name string) variable {
+	// Heuristics: if variable's name is all lowercase, consider it local
+	// string variable.
+	isLocalVariable := name == strings.ToLower(name)
+	// Local variables can't have special characters in them, because they
+	// will be used as starlark identifiers
+	if isLocalVariable {
+		name = strings.ReplaceAll(strings.TrimSpace(name), "-", "_")
+	}
 	v, found := ctx.variables[name]
 	if !found {
 		_, preset := presetVariables[name]
@@ -288,9 +309,7 @@
 			case VarClassSoong:
 				v = &otherGlobalVariable{baseVariable{nam: name, typ: vi.valueType, preset: preset}}
 			}
-		} else if name == strings.ToLower(name) {
-			// Heuristics: if variable's name is all lowercase, consider it local
-			// string variable.
+		} else if isLocalVariable {
 			v = &localVariable{baseVariable{nam: name, typ: starlarkTypeUnknown}}
 		} else {
 			vt := starlarkTypeUnknown