Merge pull request #74077 from kubamracek/embedded-autolink1

[embedded] In -emit-empty-object-file mode, don't emit autolink entries

Author: kubamracek

lib/IRGen/IRGenModule.cpp

@@ -1865,6 +1865,11 @@ static llvm::GlobalObject *createForceImportThunk(IRGenModule &IGM) {
 }
 
 void IRGenModule::emitAutolinkInfo() {
+  if (getSILModule().getOptions().StopOptimizationAfterSerialization) {
+    // We're asked to emit an empty IR module
+    return;
+  }
+
   auto Autolink =
       AutolinkKind::create(TargetInfo, Triple, IRGen.Opts.LLVMLTOKind);
 

test/embedded/modules-empty-object.swift

@@ -0,0 +1,38 @@
+// RUN: %empty-directory(%t)
+// RUN: split-file %s %t
+
+// RUN: %target-swift-frontend -target armv7em-none-none-eabi -enable-experimental-feature Embedded -c -I%t -parse-as-library %t/MyModuleA.swift -o %t/MyModuleA.o -emit-module -emit-module-path %t/MyModuleA.swiftmodule -emit-empty-object-file
+// RUN: %target-swift-frontend -target armv7em-none-none-eabi -enable-experimental-feature Embedded -c -I%t -parse-as-library %t/MyModuleB.swift -o %t/MyModuleB.o -emit-module -emit-module-path %t/MyModuleB.swiftmodule -emit-empty-object-file
+// RUN: %target-swift-frontend -target armv7em-none-none-eabi -enable-experimental-feature Embedded -c -I%t -parse-as-library %t/MyModuleC.swift -o %t/MyModuleC.o -emit-module -emit-module-path %t/MyModuleC.swiftmodule -emit-empty-object-file
+// RUN: %target-swift-frontend -target armv7em-none-none-eabi -enable-experimental-feature Embedded -c -I%t %t/Main.swift -o %t/Main.o
+// RUN: %target-clang %t/Main.o %t/MyModuleA.o %t/MyModuleB.o %t/MyModuleC.o -o %t/a.out
+
+// REQUIRES: swift_in_compiler
+// REQUIRES: OS=macosx || OS=linux-gnu
+// REQUIRES: CODEGENERATOR=ARM
+
+//--- MyModuleA.swift
+
+public func a() {}
+
+//--- MyModuleB.swift
+
+import MyModuleA
+
+public func b() {}
+
+//--- MyModuleC.swift
+
+import MyModuleB
+
+public func c() {}
+
+//--- Main.swift
+
+import MyModuleA
+import MyModuleB
+import MyModuleC
+
+a()
+b()
+c()