Support shared_libs, static_libs and default_shared_libs in cc_object

cc_object files don't link against static or shared libraries, but they
can use headers from them.  Make cc_object use the default_shared_libs
headers, and add support for explicit static and shared library
dependencies.

Bug: 153662223
Test: go test ./cc/...
Change-Id: I9ab160ede06db1b135d217d72770c22f500cfe1b

bp2build/cc_object_conversion_test.go

@@ -46,6 +46,7 @@ func TestCcObjectSimple(t *testing.T) {
 		blueprint: `cc_object {
     name: "foo",
     local_include_dirs: ["include"],
+    default_shared_libs: [],
     cflags: [
         "-Wno-gcc-compat",
         "-Wall",
@@ -83,6 +84,7 @@ func TestCcObjectDefaults(t *testing.T) {
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
+    default_shared_libs: [],
     local_include_dirs: ["include"],
     srcs: [
         "a/b/*.h",
@@ -135,12 +137,14 @@ func TestCcObjectCcObjetDepsInObjs(t *testing.T) {
 		},
 		blueprint: `cc_object {
     name: "foo",
+    default_shared_libs: [],
     srcs: ["a/b/c.c"],
     objs: ["bar"],
 }
 
 cc_object {
     name: "bar",
+    default_shared_libs: [],
     srcs: ["x/y/z.c"],
 }
 `,
@@ -178,6 +182,7 @@ func TestCcObjectIncludeBuildDirFalse(t *testing.T) {
 		},
 		blueprint: `cc_object {
     name: "foo",
+    default_shared_libs: [],
     srcs: ["a/b/c.c"],
     include_build_directory: false,
 }
@@ -199,6 +204,7 @@ func TestCcObjectProductVariable(t *testing.T) {
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
+    default_shared_libs: [],
     include_build_directory: false,
     product_variables: {
         platform_sdk_version: {
@@ -227,6 +233,7 @@ func TestCcObjectCflagsOneArch(t *testing.T) {
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
+    default_shared_libs: [],
     srcs: ["a.cpp"],
     arch: {
         x86: {
@@ -266,6 +273,7 @@ func TestCcObjectCflagsFourArch(t *testing.T) {
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
+    default_shared_libs: [],
     srcs: ["base.cpp"],
     arch: {
         x86: {
@@ -321,6 +329,7 @@ func TestCcObjectCflagsMultiOs(t *testing.T) {
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
+    default_shared_libs: [],
     srcs: ["base.cpp"],
     target: {
         android: {

cc/object.go

@@ -67,9 +67,19 @@ func (handler *objectBazelHandler) generateBazelBuildActions(ctx android.ModuleC
 }
 
 type ObjectLinkerProperties struct {
+	// list of static library modules that should only provide headers for this module.
+	Static_libs []string `android:"arch_variant,variant_prepend"`
+
+	// list of shared library modules should only provide headers for this module.
+	Shared_libs []string `android:"arch_variant"`
+
 	// list of modules that should only provide headers for this module.
 	Header_libs []string `android:"arch_variant,variant_prepend"`
 
+	// list of default libraries that will provide headers for this module.  If unset, generally
+	// defaults to libc, libm, and libdl.  Set to [] to prevent using headers from the defaults.
+	Default_shared_libs []string `android:"arch_variant"`
+
 	// names of other cc_object modules to link into this module using partial linking
 	Objs []string `android:"arch_variant"`
 
@@ -198,7 +208,18 @@ func (*objectLinker) linkerInit(ctx BaseModuleContext) {}
 
 func (object *objectLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
 	deps.HeaderLibs = append(deps.HeaderLibs, object.Properties.Header_libs...)
+	deps.SharedLibs = append(deps.SharedLibs, object.Properties.Shared_libs...)
+	deps.StaticLibs = append(deps.StaticLibs, object.Properties.Static_libs...)
 	deps.ObjFiles = append(deps.ObjFiles, object.Properties.Objs...)
+
+	deps.SystemSharedLibs = object.Properties.Default_shared_libs
+	if deps.SystemSharedLibs == nil {
+		// Provide a default set of shared libraries if default_shared_libs is unspecified.
+		// Note: If an empty list [] is specified, it implies that the module declines the
+		// default shared libraries.
+		deps.SystemSharedLibs = append(deps.SystemSharedLibs, ctx.toolchain().DefaultSharedLibraries()...)
+	}
+	deps.LateSharedLibs = append(deps.LateSharedLibs, deps.SystemSharedLibs...)
 	return deps
 }
 
@@ -247,6 +268,20 @@ func (object *objectLinker) link(ctx ModuleContext,
 	return outputFile
 }
 
+func (object *objectLinker) linkerSpecifiedDeps(specifiedDeps specifiedDeps) specifiedDeps {
+	specifiedDeps.sharedLibs = append(specifiedDeps.sharedLibs, object.Properties.Shared_libs...)
+
+	// Must distinguish nil and [] in default_shared_libs - ensure that [] in
+	// either input list doesn't come out as nil.
+	if specifiedDeps.defaultSharedLibs == nil {
+		specifiedDeps.defaultSharedLibs = object.Properties.Default_shared_libs
+	} else {
+		specifiedDeps.defaultSharedLibs = append(specifiedDeps.defaultSharedLibs, object.Properties.Default_shared_libs...)
+	}
+
+	return specifiedDeps
+}
+
 func (object *objectLinker) unstrippedOutputFilePath() android.Path {
 	return nil
 }

cc/testing.go

@@ -367,6 +367,7 @@ func commonDefaultModules() string {
 			stl: "none",
 			min_sdk_version: "16",
 			crt: true,
+			default_shared_libs: [],
 			apex_available: [
 				"//apex_available:platform",
 				"//apex_available:anyapex",

sdk/cc_sdk_test.go

@@ -347,6 +347,7 @@ func TestSnapshotWithObject(t *testing.T) {
 		cc_object {
 			name: "crtobj",
 			stl: "none",
+			default_shared_libs: [],
 			sanitize: {
 				never: true,
 			},
@@ -364,6 +365,7 @@ cc_prebuilt_object {
     apex_available: ["//apex_available:platform"],
     stl: "none",
     compile_multilib: "both",
+    default_shared_libs: [],
     sanitize: {
         never: true,
     },
@@ -388,6 +390,7 @@ cc_prebuilt_object {
     apex_available: ["//apex_available:platform"],
     stl: "none",
     compile_multilib: "both",
+    default_shared_libs: [],
     sanitize: {
         never: true,
     },