Add C symbol file to module sdk snapshot

cc_prebuilt_library_shared does not currently support generating stubs
from API symbol_files, and therefore the symbol file was removed from
the module sdk snapshots in https://ag.corp.google.com/11394495

As part of b/275273834, the stubs will be generated from the API files
for cc_prebuilt_library_shared, so add the symbol file back to the
module sdk

Bug: 275273834
Test: m nothing --no-skip-soong-tests
Test: m art-module-sdk and verified the map.txt is copied to the zip
next to the Android.bp file

Change-Id: I9551e7b8a76ceb9db3ed0434d315b6839f5e3d54

cc/cc.go

@@ -4079,6 +4079,13 @@ func (c *Module) BaseModuleName() string {
 	return c.ModuleBase.BaseModuleName()
 }
 
+func (c *Module) stubsSymbolFilePath() android.Path {
+	if library, ok := c.linker.(*libraryDecorator); ok {
+		return library.stubsSymbolFilePath
+	}
+	return android.OptionalPath{}.Path()
+}
+
 var Bool = proptools.Bool
 var BoolDefault = proptools.BoolDefault
 var BoolPtr = proptools.BoolPtr

cc/library.go

@@ -428,6 +428,9 @@ type libraryDecorator struct {
 	*baseInstaller
 
 	apiListCoverageXmlPath android.ModuleOutPath
+
+	// Path to the file containing the APIs exported by this library
+	stubsSymbolFilePath android.Path
 }
 
 // linkerProps returns the list of properties structs relevant for this library. (For example, if
@@ -596,6 +599,7 @@ func (library *libraryDecorator) compile(ctx ModuleContext, flags Flags, deps Pa
 			ctx.PropertyErrorf("symbol_file", "%q doesn't have .map.txt suffix", symbolFile)
 			return Objects{}
 		}
+		library.stubsSymbolFilePath = android.PathForModuleSrc(ctx, symbolFile)
 		// b/239274367 --apex and --systemapi filters symbols tagged with # apex and #
 		// systemapi, respectively. The former is for symbols defined in platform libraries
 		// and the latter is for symbols defined in APEXes.

cc/library_sdk_member.go

@@ -406,6 +406,9 @@ func addPossiblyArchSpecificProperties(sdkModuleContext android.ModuleContext, b
 	if len(libInfo.StubsVersions) > 0 {
 		stubsSet := outputProperties.AddPropertySet("stubs")
 		stubsSet.AddProperty("versions", libInfo.StubsVersions)
+		// The symbol file will be copied next to the Android.bp file
+		stubsSet.AddProperty("symbol_file", libInfo.StubsSymbolFilePath.Base())
+		builder.CopyToSnapshot(libInfo.StubsSymbolFilePath, libInfo.StubsSymbolFilePath.Base())
 	}
 }
 
@@ -481,6 +484,9 @@ type nativeLibInfoProperties struct {
 	// is written to does not vary by arch so cannot be android specific.
 	StubsVersions []string `sdk:"ignored-on-host"`
 
+	// The symbol file containing the APIs exported by this library.
+	StubsSymbolFilePath android.Path `sdk:"ignored-on-host"`
+
 	// Value of SanitizeProperties.Sanitize. Several - but not all - of these
 	// affect the expanded variants. All are propagated to avoid entangling the
 	// sanitizer logic with the snapshot generation.
@@ -549,6 +555,11 @@ func (p *nativeLibInfoProperties) PopulateFromVariant(ctx android.SdkMemberConte
 				// the versioned stub libs are retained in the prebuilt tree; currently only
 				// the stub corresponding to ccModule.StubsVersion() is.
 				p.StubsVersions = lib.allStubsVersions()
+				if lib.buildStubs() && ccModule.stubsSymbolFilePath() == nil {
+					ctx.ModuleErrorf("Could not determine symbol_file")
+				} else {
+					p.StubsSymbolFilePath = ccModule.stubsSymbolFilePath()
+				}
 			}
 		}
 		p.SystemSharedLibs = specifiedDeps.systemSharedLibs

sdk/cc_sdk_test.go

@@ -2205,6 +2205,7 @@ cc_prebuilt_library_shared {
             "3",
             "current",
         ],
+        symbol_file: "stubslib.map.txt",
     },
     arch: {
         arm64: {
@@ -2268,6 +2269,7 @@ cc_prebuilt_library_shared {
             "3",
             "current",
         ],
+        symbol_file: "stubslib.map.txt",
     },
     target: {
         host: {