Create 'androidmk' rule to automatically run androidbp

This finds any Android.bp files with Android modules defined, and if
there isn't an Android.mk file in the same directory, it will run
androidbp to generate one in $OUT

Change-Id: Ie8aef492e8cd28f6c314ce1254730975a1b8991f

2 files changed, 59 insertions, 0 deletions

diff --git a/common/defs.go b/common/defs.go
index 67b93ffe..98464fef 100644
--- a/common/defs.go
+++ b/common/defs.go
@@ -15,7 +15,10 @@
 package common
 
 import (
+	"path/filepath"
+
 	"github.com/google/blueprint"
+	"github.com/google/blueprint/bootstrap"
 )
 
 var (
@@ -24,6 +27,13 @@ var (
 	cpPreserveSymlinks = pctx.VariableConfigMethod("cpPreserveSymlinks",
 		Config.CpPreserveSymlinksFlags)
 
+	androidbpCmd = filepath.Join(bootstrap.BinDir, "androidbp")
+	androidbp    = pctx.StaticRule("androidbp",
+		blueprint.RuleParams{
+			Command:     androidbpCmd + " $in $out",
+			Description: "androidbp $out",
+		})
+
 	// A phony rule that is not the built-in Ninja phony rule.  The built-in
 	// phony rule has special behavior that is sometimes not desired.  See the
 	// Ninja docs for more details.
diff --git a/common/module.go b/common/module.go
index 33c586cd..bf3c435e 100644
--- a/common/module.go
+++ b/common/module.go
@@ -17,6 +17,8 @@ package common
 import (
 	"path/filepath"
 	"runtime"
+	"sort"
+	"strings"
 
 	"android/soong/glob"
 
@@ -523,12 +525,15 @@ func (c *buildTargetSingleton) GenerateBuildActions(ctx blueprint.SingletonConte
 	checkbuildDeps := []string{}
 
 	dirModules := make(map[string][]string)
+	hasBPFile := make(map[string]bool)
+	bpFiles := []string{}
 
 	ctx.VisitAllModules(func(module blueprint.Module) {
 		if a, ok := module.(AndroidModule); ok {
 			blueprintDir := a.base().blueprintDir
 			installTarget := a.base().installTarget
 			checkbuildTarget := a.base().checkbuildTarget
+			bpFile := ctx.BlueprintFile(module)
 
 			if checkbuildTarget != "" {
 				checkbuildDeps = append(checkbuildDeps, checkbuildTarget)
@@ -538,6 +543,11 @@ func (c *buildTargetSingleton) GenerateBuildActions(ctx blueprint.SingletonConte
 			if installTarget != "" {
 				dirModules[blueprintDir] = append(dirModules[blueprintDir], installTarget)
 			}
+
+			if !hasBPFile[bpFile] {
+				hasBPFile[bpFile] = true
+				bpFiles = append(bpFiles, bpFile)
+			}
 		}
 	})
 
@@ -560,4 +570,43 @@ func (c *buildTargetSingleton) GenerateBuildActions(ctx blueprint.SingletonConte
 			Optional:  true,
 		})
 	}
+
+	// Create Android.bp->mk translation rules
+	androidMks := []string{}
+	srcDir := ctx.Config().(Config).SrcDir()
+	intermediatesDir := filepath.Join(ctx.Config().(Config).IntermediatesDir(), "androidmk")
+	sort.Strings(bpFiles)
+	for _, origBp := range bpFiles {
+		bpFile := filepath.Join(srcDir, origBp)
+		mkFile := filepath.Join(srcDir, filepath.Dir(origBp), "Android.mk")
+
+		files, err := Glob(ctx, intermediatesDir, mkFile, nil)
+		if err != nil {
+			ctx.Errorf("glob: %s", err.Error())
+			continue
+		}
+
+		// Existing Android.mk file, use that instead
+		if len(files) > 0 {
+			continue
+		}
+
+		transMk := filepath.Join("androidmk", "Android_"+strings.Replace(filepath.Dir(origBp), "/", "_", -1)+".mk")
+		ctx.Build(pctx, blueprint.BuildParams{
+			Rule:      androidbp,
+			Outputs:   []string{transMk},
+			Inputs:    []string{bpFile},
+			Implicits: []string{androidbpCmd},
+			Optional:  true,
+		})
+
+		androidMks = append(androidMks, transMk)
+	}
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:      blueprint.Phony,
+		Outputs:   []string{"androidmk"},
+		Implicits: androidMks,
+		Optional:  true,
+	})
 }