diff --git a/apex/apex_test.go b/apex/apex_test.go
index dbc85d9..699ef6d 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -123,16 +123,17 @@
 	`
 
 	ctx.MockFileSystem(map[string][]byte{
-		"Android.bp":                                []byte(bp),
-		"build/target/product/security":             nil,
-		"apex_manifest.json":                        nil,
-		"system/sepolicy/apex/myapex-file_contexts": nil,
-		"mylib.cpp":                                 nil,
-		"myprebuilt":                                nil,
-		"vendor/foo/devkeys/test.x509.pem":          nil,
-		"vendor/foo/devkeys/test.pk8":               nil,
-		"vendor/foo/devkeys/testkey.avbpubkey":      nil,
-		"vendor/foo/devkeys/testkey.pem":            nil,
+		"Android.bp":                                   []byte(bp),
+		"build/target/product/security":                nil,
+		"apex_manifest.json":                           nil,
+		"system/sepolicy/apex/myapex-file_contexts":    nil,
+		"system/sepolicy/apex/otherapex-file_contexts": nil,
+		"mylib.cpp":                                    nil,
+		"myprebuilt":                                   nil,
+		"vendor/foo/devkeys/test.x509.pem":             nil,
+		"vendor/foo/devkeys/test.pk8":                  nil,
+		"vendor/foo/devkeys/testkey.avbpubkey":         nil,
+		"vendor/foo/devkeys/testkey.pem":               nil,
 	})
 	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
 	android.FailIfErrored(t, errs)
@@ -729,3 +730,47 @@
 			"vendor/foo/devkeys/test.x509.pem vendor/foo/devkeys/test.pk8")
 	}
 }
+
+func TestMacro(t *testing.T) {
+	ctx := testApex(t, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			native_shared_libs: ["mylib"],
+		}
+
+		apex {
+			name: "otherapex",
+			key: "myapex.key",
+			native_shared_libs: ["mylib"],
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+
+		cc_library {
+			name: "mylib",
+			srcs: ["mylib.cpp"],
+			system_shared_libs: [],
+			stl: "none",
+		}
+	`)
+
+	// non-APEX variant does not have __ANDROID__APEX__ defined
+	mylibCFlags := ctx.ModuleForTests("mylib", "android_arm64_armv8-a_core_static").Rule("cc").Args["cFlags"]
+	ensureNotContains(t, mylibCFlags, "-D__ANDROID_APEX__=myapex")
+	ensureNotContains(t, mylibCFlags, "-D__ANDROID_APEX__=otherapex")
+
+	// APEX variant has __ANDROID_APEX__=<apexname> defined
+	mylibCFlags = ctx.ModuleForTests("mylib", "android_arm64_armv8-a_core_static_myapex").Rule("cc").Args["cFlags"]
+	ensureContains(t, mylibCFlags, "-D__ANDROID_APEX__=myapex")
+	ensureNotContains(t, mylibCFlags, "-D__ANDROID_APEX__=otherapex")
+
+	// APEX variant has __ANDROID_APEX__=<apexname> defined
+	mylibCFlags = ctx.ModuleForTests("mylib", "android_arm64_armv8-a_core_static_otherapex").Rule("cc").Args["cFlags"]
+	ensureNotContains(t, mylibCFlags, "-D__ANDROID_APEX__=myapex")
+	ensureContains(t, mylibCFlags, "-D__ANDROID_APEX__=otherapex")
+}
diff --git a/cc/cc.go b/cc/cc.go
index baee70a..02efcc9 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -258,7 +258,7 @@
 	getVndkExtendsModuleName() string
 	isPgoCompile() bool
 	useClangLld(actx ModuleContext) bool
-	isApex() bool
+	apexName() string
 	hasStubsVariants() bool
 	isStubs() bool
 }
@@ -720,9 +720,8 @@
 	return ctx.mod.getVndkExtendsModuleName()
 }
 
-// Tests if this module is built for APEX
-func (ctx *moduleContextImpl) isApex() bool {
-	return ctx.mod.ApexName() != ""
+func (ctx *moduleContextImpl) apexName() string {
+	return ctx.mod.ApexName()
 }
 
 func (ctx *moduleContextImpl) hasStubsVariants() bool {
diff --git a/cc/compiler.go b/cc/compiler.go
index 63d2ade..fbe10b5 100644
--- a/cc/compiler.go
+++ b/cc/compiler.go
@@ -341,6 +341,10 @@
 		flags.GlobalFlags = append(flags.GlobalFlags, "-D__ANDROID_RECOVERY__")
 	}
 
+	if ctx.apexName() != "" {
+		flags.GlobalFlags = append(flags.GlobalFlags, "-D__ANDROID_APEX__="+ctx.apexName())
+	}
+
 	instructionSet := String(compiler.Properties.Instruction_set)
 	if flags.RequiredInstructionSet != "" {
 		instructionSet = flags.RequiredInstructionSet