build system implementation for c/cpp test mode codegen

Bug: b/300488560
Test: added unit test and tested with AconfigDemoActivity app
Change-Id: I6ad71cc2dada8feb53662ec47c8acad5bc43d5ce

aconfig/Android.bp

@@ -32,6 +32,8 @@ bootstrap_go_package {
         "aconfig_values_test.go",
         "aconfig_value_set_test.go",
         "java_aconfig_library_test.go",
+        "cc_aconfig_library_test.go",
+        "rust_aconfig_library_test.go",
     ],
     pluginFor: ["soong_build"],
 }

aconfig/cc_aconfig_library.go

@@ -17,7 +17,9 @@ package aconfig
 import (
 	"android/soong/android"
 	"android/soong/cc"
+
 	"github.com/google/blueprint"
+	"github.com/google/blueprint/proptools"
 
 	"fmt"
 	"strings"
@@ -32,6 +34,9 @@ var ccDeclarationsTag = ccDeclarationsTagType{}
 type CcAconfigLibraryProperties struct {
 	// name of the aconfig_declarations module to generate a library for
 	Aconfig_declarations string
+
+	// whether to generate test mode version of the library
+	Test *bool
 }
 
 type CcAconfigLibraryCallbacks struct {
@@ -113,6 +118,12 @@ func (this *CcAconfigLibraryCallbacks) GeneratorBuildActions(ctx cc.ModuleContex
 	}
 	declarations := ctx.OtherModuleProvider(declarationsModules[0], declarationsProviderKey).(declarationsProviderData)
 
+	var mode string
+	if proptools.Bool(this.properties.Test) {
+		mode = "test"
+	} else {
+		mode = "production"
+	}
 	ctx.Build(pctx, android.BuildParams{
 		Rule:  cppRule,
 		Input: declarations.IntermediatePath,
@@ -123,6 +134,7 @@ func (this *CcAconfigLibraryCallbacks) GeneratorBuildActions(ctx cc.ModuleContex
 		Description: "cc_aconfig_library",
 		Args: map[string]string{
 			"gendir": this.generatedDir.String(),
+			"mode":   mode,
 		},
 	})
 }

aconfig/cc_aconfig_library_test.go

@@ -0,0 +1,67 @@
+// Copyright 2023 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package aconfig
+
+import (
+	"fmt"
+	"testing"
+
+	"android/soong/android"
+	"android/soong/cc"
+)
+
+var codegenModeTestData = []struct {
+	setting, expected string
+}{
+	{"", "production"},
+	{"test: false,", "production"},
+	{"test: true,", "test"},
+}
+
+func TestCCCodegenMode(t *testing.T) {
+	for _, testData := range codegenModeTestData {
+		testCCCodegenModeHelper(t, testData.setting, testData.expected)
+	}
+}
+
+func testCCCodegenModeHelper(t *testing.T, bpMode string, ruleMode string) {
+	t.Helper()
+	result := android.GroupFixturePreparers(
+		PrepareForTestWithAconfigBuildComponents,
+		cc.PrepareForTestWithCcDefaultModules).
+		ExtendWithErrorHandler(android.FixtureExpectsNoErrors).
+		RunTestWithBp(t, fmt.Sprintf(`
+			aconfig_declarations {
+				name: "my_aconfig_declarations",
+				package: "com.example.package",
+				srcs: ["foo.aconfig"],
+			}
+
+			cc_library {
+    		name: "server_configurable_flags",
+    		srcs: ["server_configurable_flags.cc"],
+			}
+
+			cc_aconfig_library {
+				name: "my_cc_aconfig_library",
+				aconfig_declarations: "my_aconfig_declarations",
+				%s
+			}
+		`, bpMode))
+
+	module := result.ModuleForTests("my_cc_aconfig_library", "android_arm64_armv8-a_shared")
+	rule := module.Rule("cc_aconfig_library")
+	android.AssertStringEquals(t, "rule must contain test mode", rule.Args["mode"], ruleMode)
+}

aconfig/init.go

@@ -64,13 +64,14 @@ var (
 			Command: `rm -rf ${gendir}` +
 				` && mkdir -p ${gendir}` +
 				` && ${aconfig} create-cpp-lib` +
+				`    --mode ${mode}` +
 				`    --cache ${in}` +
 				`    --out ${gendir}`,
 			CommandDeps: []string{
 				"$aconfig",
 				"$soong_zip",
 			},
-		}, "gendir")
+		}, "gendir", "mode")
 
 	rustRule = pctx.AndroidStaticRule("rust_aconfig_library",
 		blueprint.RuleParams{