diff --git a/cmd/multiproduct_kati/main.go b/cmd/multiproduct_kati/main.go
index 20f146a..55a5470 100644
--- a/cmd/multiproduct_kati/main.go
+++ b/cmd/multiproduct_kati/main.go
@@ -460,19 +460,21 @@
 		}
 	}()
 
-	buildWhat := build.BuildProductConfig
+	config.SetSkipNinja(true)
+
+	buildWhat := build.RunProductConfig
 	if !*onlyConfig {
-		buildWhat |= build.BuildSoong
+		buildWhat |= build.RunSoong
 		if !*onlySoong {
-			buildWhat |= build.BuildKati
+			buildWhat |= build.RunKati
 		}
 	}
 
 	before := time.Now()
-	build.Build(ctx, config, buildWhat)
+	build.Build(ctx, config)
 
 	// Save std_full.log if Kati re-read the makefiles
-	if buildWhat&build.BuildKati != 0 {
+	if buildWhat&build.RunKati != 0 {
 		if after, err := os.Stat(config.KatiBuildNinjaFile()); err == nil && after.ModTime().After(before) {
 			err := copyFile(stdLog, filepath.Join(filepath.Dir(stdLog), "std_full.log"))
 			if err != nil {
diff --git a/cmd/soong_ui/main.go b/cmd/soong_ui/main.go
index 390a9ec..22922c0 100644
--- a/cmd/soong_ui/main.go
+++ b/cmd/soong_ui/main.go
@@ -59,12 +59,10 @@
 	run func(ctx build.Context, config build.Config, args []string, logsDir string)
 }
 
-const makeModeFlagName = "--make-mode"
-
 // list of supported commands (flags) supported by soong ui
 var commands []command = []command{
 	{
-		flag:        makeModeFlagName,
+		flag:        "--make-mode",
 		description: "build the modules by the target name (i.e. soong_docs)",
 		config: func(ctx build.Context, args ...string) build.Config {
 			return build.NewConfig(ctx, args...)
@@ -506,15 +504,7 @@
 		ctx.Fatal("done")
 	}
 
-	toBuild := build.BuildAll
-	if config.UseBazel() {
-		toBuild = build.BuildAllWithBazel
-	}
-
-	if config.Checkbuild() {
-		toBuild |= build.RunBuildTests
-	}
-	build.Build(ctx, config, toBuild)
+	build.Build(ctx, config)
 }
 
 // getCommand finds the appropriate command based on args[1] flag. args[0]
diff --git a/cuj/cuj.go b/cuj/cuj.go
index 3333012..b4ae9a2 100644
--- a/cuj/cuj.go
+++ b/cuj/cuj.go
@@ -115,7 +115,7 @@
 	defer f.Shutdown()
 	build.FindSources(buildCtx, config, f)
 
-	build.Build(buildCtx, config, build.BuildAll)
+	build.Build(buildCtx, config)
 
 	t.results.metrics = met
 }
diff --git a/ui/build/build.go b/ui/build/build.go
index c2ad057..da44b65 100644
--- a/ui/build/build.go
+++ b/ui/build/build.go
@@ -87,15 +87,20 @@
 
 // These are bitmasks which can be used to check whether various flags are set e.g. whether to use Bazel.
 const (
-	BuildNone          = iota
-	BuildProductConfig = 1 << iota
-	BuildSoong         = 1 << iota
-	BuildKati          = 1 << iota
-	BuildNinja         = 1 << iota
-	BuildBazel         = 1 << iota
-	RunBuildTests      = 1 << iota
-	BuildAll           = BuildProductConfig | BuildSoong | BuildKati | BuildNinja
-	BuildAllWithBazel  = BuildProductConfig | BuildSoong | BuildKati | BuildBazel
+	_ = iota
+	// Whether to run the kati config step.
+	RunProductConfig = 1 << iota
+	// Whether to run soong to generate a ninja file.
+	RunSoong = 1 << iota
+	// Whether to run kati to generate a ninja file.
+	RunKati = 1 << iota
+	// Whether to run ninja on the combined ninja.
+	RunNinja = 1 << iota
+	// Whether to run bazel on the combined ninja.
+	RunBazel        = 1 << iota
+	RunBuildTests   = 1 << iota
+	RunAll          = RunProductConfig | RunSoong | RunKati | RunNinja
+	RunAllWithBazel = RunProductConfig | RunSoong | RunKati | RunBazel
 )
 
 // checkProblematicFiles fails the build if existing Android.mk or CleanSpec.mk files are found at the root of the tree.
@@ -173,7 +178,7 @@
 
 // Build the tree. The 'what' argument can be used to chose which components of
 // the build to run, via checking various bitmasks.
-func Build(ctx Context, config Config, what int) {
+func Build(ctx Context, config Config) {
 	ctx.Verboseln("Starting build with args:", config.Arguments())
 	ctx.Verboseln("Environment:", config.Environment().Environ())
 
@@ -208,33 +213,35 @@
 
 	SetupPath(ctx, config)
 
+	what := RunAll
+	if config.UseBazel() {
+		what = RunAllWithBazel
+	}
+	if config.Checkbuild() {
+		what |= RunBuildTests
+	}
 	if config.SkipConfig() {
 		ctx.Verboseln("Skipping Config as requested")
-		what = what &^ BuildProductConfig
+		what = what &^ RunProductConfig
 	}
-
 	if config.SkipKati() {
 		ctx.Verboseln("Skipping Kati as requested")
-		what = what &^ BuildKati
+		what = what &^ RunKati
 	}
-
 	if config.SkipNinja() {
 		ctx.Verboseln("Skipping Ninja as requested")
-		what = what &^ BuildNinja
+		what = what &^ RunNinja
 	}
 
 	if config.StartGoma() {
-		// Ensure start Goma compiler_proxy
 		startGoma(ctx, config)
 	}
 
 	if config.StartRBE() {
-		// Ensure RBE proxy is started
 		startRBE(ctx, config)
 	}
 
-	if what&BuildProductConfig != 0 {
-		// Run make for product config
+	if what&RunProductConfig != 0 {
 		runMakeProductConfig(ctx, config)
 	}
 
@@ -254,8 +261,7 @@
 		return
 	}
 
-	if what&BuildSoong != 0 {
-		// Run Soong
+	if what&RunSoong != 0 {
 		runSoong(ctx, config)
 
 		if config.bazelBuildMode() == generateBuildFiles {
@@ -264,8 +270,7 @@
 		}
 	}
 
-	if what&BuildKati != 0 {
-		// Run ckati
+	if what&RunKati != 0 {
 		genKatiSuffix(ctx, config)
 		runKatiCleanSpec(ctx, config)
 		runKatiBuild(ctx, config)
@@ -289,17 +294,16 @@
 		testForDanglingRules(ctx, config)
 	}
 
-	if what&BuildNinja != 0 {
-		if what&BuildKati != 0 {
+	if what&RunNinja != 0 {
+		if what&RunKati != 0 {
 			installCleanIfNecessary(ctx, config)
 		}
 
-		// Run ninja
 		runNinjaForBuild(ctx, config)
 	}
 
 	// Currently, using Bazel requires Kati and Soong to run first, so check whether to run Bazel last.
-	if what&BuildBazel != 0 {
+	if what&RunBazel != 0 {
 		runBazel(ctx, config)
 	}
 }
diff --git a/ui/build/config.go b/ui/build/config.go
index 3ebde0d..bbb3c9c 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -565,8 +565,7 @@
 func (c *configImpl) parseArgs(ctx Context, args []string) {
 	for i := 0; i < len(args); i++ {
 		arg := strings.TrimSpace(args[i])
-		if arg == "--make-mode" {
-		} else if arg == "showcommands" {
+		if arg == "showcommands" {
 			c.verbose = true
 		} else if arg == "--skip-ninja" {
 			c.skipNinja = true
@@ -794,6 +793,10 @@
 	return c.skipNinja
 }
 
+func (c *configImpl) SetSkipNinja(v bool) {
+	c.skipNinja = v
+}
+
 func (c *configImpl) SkipConfig() bool {
 	return c.skipConfig
 }