cc_prebuilt_library respect module name and stem

Installed name of prebuilt shared library should be stem or module name.
For example:

cc_prebuilt_library_shared {
  name: "libfoo",
  srcs: ["libbar.so"],
}
should install with the filename libfoo.so, and

cc_prebuilt_library_shared {
  name: "libfoo",
  stem: "libbaz",
  srcs: ["libbar.so"],
}
should install with the filename libbaz.so.

Prebuilt Windows PE library should specify its import library.
For example:

cc_prebuilt_library_shared {
  name: "libfoo",
  srcs: ["libfoo.dll"],
  windows_import_lib: "libfoo.lib",
  enabled: false,
  target: {
    windows: {
      enabled: true,
    },
  },
}

Bug: 151744695
Test: prebuilt_test.go && built walleye-userdebug
Change-Id: Ia8d0afb7fa46783c670870440432779c5fc7321a

cc/prebuilt.go

@@ -43,6 +43,11 @@ type prebuiltLinkerProperties struct {
 	// Check the prebuilt ELF files (e.g. DT_SONAME, DT_NEEDED, resolution of undefined
 	// symbols, etc), default true.
 	Check_elf_files *bool
+
+	// Optionally provide an import library if this is a Windows PE DLL prebuilt.
+	// This is needed only if this library is linked by other modules in build time.
+	// Only makes sense for the Windows target.
+	Windows_import_lib *string `android:"path,arch_variant"`
 }
 
 type prebuiltLinker struct {
@@ -109,9 +114,16 @@ func (p *prebuiltLibraryLinker) link(ctx ModuleContext,
 
 		in := android.PathForModuleSrc(ctx, srcs[0])
 
+		if p.static() {
+			return in
+		}
+
 		if p.shared() {
 			p.unstrippedOutputFile = in
 			libName := p.libraryDecorator.getLibName(ctx) + flags.Toolchain.ShlibSuffix()
+			outputFile := android.PathForModuleOut(ctx, libName)
+			var implicits android.Paths
+
 			if p.needsStrip(ctx) {
 				stripped := android.PathForModuleOut(ctx, "stripped", libName)
 				p.stripExecutableOrSharedLib(ctx, in, stripped, builderFlags)
@@ -122,10 +134,41 @@ func (p *prebuiltLibraryLinker) link(ctx ModuleContext,
 			// depending on a table of contents file instead of the library itself.
 			tocFile := android.PathForModuleOut(ctx, libName+".toc")
 			p.tocFile = android.OptionalPathForPath(tocFile)
-			TransformSharedObjectToToc(ctx, in, tocFile, builderFlags)
+			TransformSharedObjectToToc(ctx, outputFile, tocFile, builderFlags)
-		}
 
-		return in
+			if ctx.Windows() && p.properties.Windows_import_lib != nil {
+				// Consumers of this library actually links to the import library in build
+				// time and dynamically links to the DLL in run time. i.e.
+				// a.exe <-- static link --> foo.lib <-- dynamic link --> foo.dll
+				importLibSrc := android.PathForModuleSrc(ctx, String(p.properties.Windows_import_lib))
+				importLibName := p.libraryDecorator.getLibName(ctx) + ".lib"
+				importLibOutputFile := android.PathForModuleOut(ctx, importLibName)
+				implicits = append(implicits, importLibOutputFile)
+
+				ctx.Build(pctx, android.BuildParams{
+					Rule:        android.Cp,
+					Description: "prebuilt import library",
+					Input:       importLibSrc,
+					Output:      importLibOutputFile,
+					Args: map[string]string{
+						"cpFlags": "-L",
+					},
+				})
+			}
+
+			ctx.Build(pctx, android.BuildParams{
+				Rule:        android.Cp,
+				Description: "prebuilt shared library",
+				Implicits:   implicits,
+				Input:       in,
+				Output:      outputFile,
+				Args: map[string]string{
+					"cpFlags": "-L",
+				},
+			})
+
+			return outputFile
+		}
 	}
 
 	return nil

cc/prebuilt_test.go

@@ -184,7 +184,7 @@ func TestPrebuiltLibraryShared(t *testing.T) {
 	})
 
 	shared := ctx.ModuleForTests("libtest", "android_arm64_armv8-a_shared").Module().(*Module)
-	assertString(t, shared.OutputFile().String(), "libf.so")
+	assertString(t, shared.OutputFile().Path().Base(), "libtest.so")
 }
 
 func TestPrebuiltLibraryStatic(t *testing.T) {
@@ -198,7 +198,7 @@ func TestPrebuiltLibraryStatic(t *testing.T) {
 	})
 
 	static := ctx.ModuleForTests("libtest", "android_arm64_armv8-a_static").Module().(*Module)
-	assertString(t, static.OutputFile().String(), "libf.a")
+	assertString(t, static.OutputFile().Path().Base(), "libf.a")
 }
 
 func TestPrebuiltLibrary(t *testing.T) {
@@ -221,8 +221,53 @@ func TestPrebuiltLibrary(t *testing.T) {
 	})
 
 	shared := ctx.ModuleForTests("libtest", "android_arm64_armv8-a_shared").Module().(*Module)
-	assertString(t, shared.OutputFile().String(), "libf.so")
+	assertString(t, shared.OutputFile().Path().Base(), "libtest.so")
 
 	static := ctx.ModuleForTests("libtest", "android_arm64_armv8-a_static").Module().(*Module)
-	assertString(t, static.OutputFile().String(), "libf.a")
+	assertString(t, static.OutputFile().Path().Base(), "libf.a")
+}
+
+func TestPrebuiltLibraryStem(t *testing.T) {
+	ctx := testPrebuilt(t, `
+	cc_prebuilt_library {
+		name: "libfoo",
+		stem: "libbar",
+		static: {
+			srcs: ["libfoo.a"],
+		},
+		shared: {
+			srcs: ["libfoo.so"],
+		},
+		strip: {
+			none: true,
+		},
+	}
+	`, map[string][]byte{
+		"libfoo.a":  nil,
+		"libfoo.so": nil,
+	})
+
+	static := ctx.ModuleForTests("libfoo", "android_arm64_armv8-a_static").Module().(*Module)
+	assertString(t, static.OutputFile().Path().Base(), "libfoo.a")
+
+	shared := ctx.ModuleForTests("libfoo", "android_arm64_armv8-a_shared").Module().(*Module)
+	assertString(t, shared.OutputFile().Path().Base(), "libbar.so")
+}
+
+func TestPrebuiltLibrarySharedStem(t *testing.T) {
+	ctx := testPrebuilt(t, `
+	cc_prebuilt_library_shared {
+		name: "libfoo",
+		stem: "libbar",
+		srcs: ["libfoo.so"],
+		strip: {
+			none: true,
+		},
+	}
+	`, map[string][]byte{
+		"libfoo.so": nil,
+	})
+
+	shared := ctx.ModuleForTests("libfoo", "android_arm64_armv8-a_shared").Module().(*Module)
+	assertString(t, shared.OutputFile().Path().Base(), "libbar.so")
 }