Merge pull request swiftlang#82355 from etcwilde/ewilde/fbsd-cxx-interop-runtime

FreeBSD: Link C++ runtimes when Cxx interop is enabled

Author: etcwilde

lib/AST/ModuleDependencies.cpp

@@ -585,7 +585,8 @@ void swift::dependencies::registerCxxInteropLibraries(
                       return mainModuleName == Name;
                     })) {
     // Only link with CxxStdlib on platforms where the overlay is available.
-    if (Target.isOSDarwin() || Target.isOSLinux() || Target.isOSWindows())
+    if (Target.isOSDarwin() || Target.isOSLinux() || Target.isOSWindows() ||
+        Target.isOSFreeBSD())
       RegistrationCallback(LinkLibrary{"swiftCxxStdlib", LibraryKind::Library,
                                        hasStaticCxxStdlib});
   }

lib/Driver/ToolChains.cpp

@@ -1650,9 +1650,10 @@ const char *ToolChain::getClangLinkerDriver(
   // a C++ standard library if it's not needed, in particular because the
   // standard library that `clang++` selects by default may not be the one that
   // is desired.
-  const char *LinkerDriver =
-      Args.hasArg(options::OPT_enable_experimental_cxx_interop) ? "clang++"
-                                                                : "clang";
+  bool useCxxLinker = Args.hasArg(options::OPT_enable_experimental_cxx_interop);
+  if (Arg *arg = Args.getLastArg(options::OPT_cxx_interoperability_mode))
+      useCxxLinker |= StringRef(arg->getValue()) != "off";
+  const char *LinkerDriver = useCxxLinker ? "clang++" : "clang";
   if (const Arg *A = Args.getLastArg(options::OPT_tools_directory)) {
     StringRef toolchainPath(A->getValue());
 

lib/Frontend/CompilerInvocation.cpp

@@ -391,7 +391,8 @@ void CompilerInvocation::computeCXXStdlibOptions() {
     // (see https://reviews.llvm.org/D101479).
     LangOpts.CXXStdlib = CXXStdlibKind::Msvcprt;
     LangOpts.PlatformDefaultCXXStdlib = CXXStdlibKind::Msvcprt;
-  } else if (LangOpts.Target.isOSLinux() || LangOpts.Target.isOSDarwin()) {
+  } else if (LangOpts.Target.isOSLinux() || LangOpts.Target.isOSDarwin() ||
+             LangOpts.Target.isOSFreeBSD()) {
     auto [clangDriver, clangDiagEngine] =
         ClangImporter::createClangDriver(LangOpts, ClangImporterOpts);
     auto clangDriverArgs = ClangImporter::createClangArgs(

test/Interop/Cxx/stdlib/avoid-import-cxx-math.swift

@@ -2,7 +2,7 @@
 // RUN: %target-swift-frontend %s -typecheck -verify -cxx-interoperability-mode=swift-6
 // RUN: %target-swift-frontend %s -typecheck -verify -cxx-interoperability-mode=upcoming-swift
 
-// REQUIRES: OS=macosx || OS=linux-gnu
+// REQUIRES: OS=macosx || OS=linux-gnu || OS=freebsd
 
 import CxxStdlib
 

test/Interop/Cxx/stdlib/overlay/custom-sequence.swift

@@ -1,7 +1,7 @@
 // RUN: %target-run-simple-swift(-I %S/Inputs -Xfrontend -enable-experimental-cxx-interop)
 //
 // REQUIRES: executable_test
-// REQUIRES: OS=macosx || OS=linux-gnu
+// REQUIRES: OS=macosx || OS=linux-gnu || OS=freebsd
 
 // REQUIRES: rdar102364960
 

test/Interop/Cxx/stdlib/use-std-map.swift

@@ -11,7 +11,7 @@
 
 // REQUIRES: executable_test
 //
-// REQUIRES: OS=macosx || OS=linux-gnu
+// REQUIRES: OS=macosx || OS=linux-gnu || OS=freebsd
 
 import StdlibUnittest
 #if !BRIDGING_HEADER