rust: Add export_include_dirs property to rust_ffi

The cc property include_dirs is neverallowed in certain paths since it
has been deprecated. The property in rust_ffi modules with the same name  functionally works the same way as the CC property export_include_dirs.

To reduce confusion, and avoid triggering the neverallow rule, deprecate
include_dirs and create an export_include_dirs property which does the
same thing. This brings rust module properties into better alignment
with cc module property as well, reducing confusion.

Bug: 330736943
Test: New Soong test
Change-Id: Ib2020a22e6747ac690c46dbff84e38744f93ed15

rust/library.go

@@ -54,9 +54,13 @@ type LibraryCompilerProperties struct {
 	Shared VariantLibraryProperties `android:"arch_variant"`
 	Static VariantLibraryProperties `android:"arch_variant"`
 
-	// path to include directories to pass to cc_* modules, only relevant for static/shared variants.
+	// TODO: Remove this when all instances of Include_dirs have been removed from rust_ffi modules.
+	// path to include directories to pass to cc_* modules, only relevant for static/shared variants (deprecated, use export_include_dirs instead).
 	Include_dirs []string `android:"path,arch_variant"`
 
+	// path to include directories to export to cc_* modules, only relevant for static/shared variants.
+	Export_include_dirs []string `android:"path,arch_variant"`
+
 	// Whether this library is part of the Rust toolchain sysroot.
 	Sysroot *bool
 }
@@ -465,6 +469,7 @@ func (library *libraryDecorator) compilerFlags(ctx ModuleContext, flags Flags) F
 	flags.RustFlags = append(flags.RustFlags, "-C metadata="+ctx.ModuleName())
 	if library.shared() || library.static() {
 		library.includeDirs = append(library.includeDirs, android.PathsForModuleSrc(ctx, library.Properties.Include_dirs)...)
+		library.includeDirs = append(library.includeDirs, android.PathsForModuleSrc(ctx, library.Properties.Export_include_dirs)...)
 	}
 	if library.shared() {
 		if ctx.Darwin() {

rust/library_test.go

@@ -403,3 +403,22 @@ func TestLibstdLinkage(t *testing.T) {
 	}
 
 }
+
+func TestRustFFIExportedIncludes(t *testing.T) {
+	ctx := testRust(t, `
+		rust_ffi {
+			name: "libbar",
+			srcs: ["foo.rs"],
+			crate_name: "bar",
+			export_include_dirs: ["rust_includes"],
+			host_supported: true,
+		}
+		cc_library_static {
+			name: "libfoo",
+			srcs: ["foo.cpp"],
+			shared_libs: ["libbar"],
+			host_supported: true,
+		}`)
+	libfooStatic := ctx.ModuleForTests("libfoo", "linux_glibc_x86_64_static").Rule("cc")
+	android.AssertStringDoesContain(t, "cFlags for lib module", libfooStatic.Args["cFlags"], " -Irust_includes ")
+}

rust/vendor_snapshot_test.go

@@ -32,7 +32,7 @@ func TestVendorSnapshotCapture(t *testing.T) {
 		crate_name: "ffivendor_available",
 		srcs: ["lib.rs"],
 		vendor_available: true,
-		include_dirs: ["rust_headers/"],
+		export_include_dirs: ["rust_headers/"],
 	}
 
 	rust_ffi {
@@ -40,7 +40,7 @@ func TestVendorSnapshotCapture(t *testing.T) {
 		crate_name: "ffivendor",
 		srcs: ["lib.rs"],
 		vendor: true,
-		include_dirs: ["rust_headers/"],
+		export_include_dirs: ["rust_headers/"],
 	}
 
 	rust_library {