[embedded] Error if embedded Swift enables library evolution.

Author: zoecarver

include/swift/AST/DiagnosticsFrontend.def

@@ -554,5 +554,8 @@ ERROR(layout_string_instantiation_without_layout_strings,none,
       "-enable-layout-string-value-witnesses-instantiation can not be enabled "
       "without -enable-layout-string-value-witnesses.", ())
 
+ERROR(evolution_with_embedded,none,
+      "Library evolution cannot be enabled with embedded Swift.", ())
+
 #define UNDEFINE_DIAGNOSTIC_MACROS
 #include "DefineDiagnosticMacros.h"

lib/Frontend/CompilerInvocation.cpp

@@ -1316,6 +1316,11 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
   }
   Opts.BypassResilienceChecks |= Args.hasArg(OPT_bypass_resilience);
 
+  if (FrontendOpts.EnableLibraryEvolution && Opts.hasFeature(Feature::Embedded)) {
+    Diags.diagnose(SourceLoc(), diag::evolution_with_embedded);
+    HadError = true;
+  }
+
   return HadError || UnsupportedOS || UnsupportedArch;
 }
 

test/embedded/evolution-with-embedded-diag.swift

@@ -0,0 +1,4 @@
+// RUN: not %target-swift-frontend -emit-ir %s -enable-library-evolution -enable-experimental-feature Embedded 2>&1 | %FileCheck %s
+// RUN: not %target-swift-frontend -emit-ir %s -enable-resilience -enable-experimental-feature Embedded 2>&1 | %FileCheck %s
+
+// CHECK: error: Library evolution cannot be enabled with embedded Swift.