Switch to clang-r346389.

* Add -fno-sanitize=implicit-integer-sign-change when
  there is any integer related sanitizer, and this check
  is not explicitly specified.
  Android core does not boot with this new sanitizer yet.
* Filter out -fno-sanitize=implicit-integer-sign-change
  from tooling flags.

Bug: 119329758
Bug: 119557795
Test: make checkbuild, boot, go/clang-r346389-testing
Change-Id: I709de569cb73d070fc4958e2b4387f4041bc5438

cc/config/clang.go

@@ -91,7 +91,9 @@ var ClangUnknownLldflags = sorted([]string{
 	"-Wl,-m,aarch64_elf64_le_vec",
 })
 
-var ClangLibToolingUnknownCflags []string = nil
+var ClangLibToolingUnknownCflags = sorted([]string{
+	"-fno-sanitize=implicit-integer-sign-change",
+})
 
 func init() {
 	pctx.StaticVariable("ClangExtraCflags", strings.Join([]string{

cc/config/global.go

@@ -120,8 +120,8 @@ var (
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-r344140b"
+	ClangDefaultVersion      = "clang-r346389"
-	ClangDefaultShortVersion = "8.0.4"
+	ClangDefaultShortVersion = "8.0.5"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{

cc/sanitize.go

@@ -376,6 +376,22 @@ func (sanitize *sanitize) deps(ctx BaseModuleContext, deps Deps) Deps {
 	return deps
 }
 
+func toDisableImplicitIntegerChange(flags []string) bool {
+	// Returns true if any flag is fsanitize*integer, and there is
+	// no explicit flag about sanitize=implicit-integer-sign-change.
+	for _, f := range flags {
+		if strings.Contains(f, "sanitize=implicit-integer-sign-change") {
+			return false
+		}
+	}
+	for _, f := range flags {
+		if strings.HasPrefix(f, "-fsanitize") && strings.Contains(f, "integer") {
+			return true
+		}
+	}
+	return false
+}
+
 func (sanitize *sanitize) flags(ctx ModuleContext, flags Flags) Flags {
 	minimalRuntimeLib := config.UndefinedBehaviorSanitizerMinimalRuntimeLibrary(ctx.toolchain()) + ".a"
 	minimalRuntimePath := "${config.ClangAsanLibDir}/" + minimalRuntimeLib
@@ -533,6 +549,10 @@ func (sanitize *sanitize) flags(ctx ModuleContext, flags Flags) Flags {
 				flags.LdFlags = append(flags.LdFlags, "-Wl,--exclude-libs,"+minimalRuntimeLib)
 			}
 		}
+		// http://b/119329758, Android core does not boot up with this sanitizer yet.
+		if toDisableImplicitIntegerChange(flags.CFlags) {
+			flags.CFlags = append(flags.CFlags, "-fno-sanitize=implicit-integer-sign-change")
+		}
 	}
 
 	if len(diagSanitizers) > 0 {