[concurrency] Implement a compatibility .a library for Concurrency.

In a back deployment scenario, this will provide a place where one could provide
function implementations that are not available in the relevant stdlib.

This is just setting up for future work and isn't doing anything interesting
beyond wiring it up/making sure that it is wired up correctly with tests.

Author: gottesmm

include/swift/AST/IRGenOptions.h

@@ -370,6 +370,8 @@ class IRGenOptions {
   /// Pull in runtime compatibility shim libraries by autolinking.
   Optional<llvm::VersionTuple> AutolinkRuntimeCompatibilityLibraryVersion;
   Optional<llvm::VersionTuple> AutolinkRuntimeCompatibilityDynamicReplacementLibraryVersion;
+  Optional<llvm::VersionTuple>
+      AutolinkRuntimeCompatibilityConcurrencyLibraryVersion;
 
   JITDebugArtifact DumpJIT = JITDebugArtifact::None;
 

include/swift/Frontend/BackDeploymentLibs.def

@@ -27,5 +27,6 @@
 BACK_DEPLOYMENT_LIB((5, 0), all, "swiftCompatibility50")
 BACK_DEPLOYMENT_LIB((5, 1), all, "swiftCompatibility51")
 BACK_DEPLOYMENT_LIB((5, 0), executable, "swiftCompatibilityDynamicReplacements")
+BACK_DEPLOYMENT_LIB((5, 5), all, "swiftCompatibilityConcurrency")
 
 #undef BACK_DEPLOYMENT_LIB

include/swift/Option/Options.td

@@ -1228,6 +1228,12 @@ def disable_autolinking_runtime_compatibility_dynamic_replacements
       HelpText<"Do not use autolinking for the dynamic replacement runtime "
                "compatibility library">;
 
+def disable_autolinking_runtime_compatibility_concurrency
+    : Flag<[ "-" ], "disable-autolinking-runtime-compatibility-concurrency">,
+      Flags<[ FrontendOption ]>,
+      HelpText<"Do not use autolinking for the concurrency runtime "
+               "compatibility library">;
+
 def emit_symbol_graph: Flag<["-"], "emit-symbol-graph">,
   Flags<[FrontendOption, NoInteractiveOption, SupplementaryOutput, HelpHidden]>,
   HelpText<"Emit a symbol graph">;

lib/Driver/DarwinToolChains.cpp

@@ -409,6 +409,8 @@ toolchains::Darwin::addArgsToLinkStdlib(ArgStringList &Arguments,
       runtimeCompatibilityVersion = llvm::VersionTuple(5, 0);
     } else if (value.equals("5.1")) {
       runtimeCompatibilityVersion = llvm::VersionTuple(5, 1);
+    } else if (value.equals("5.5")) {
+      runtimeCompatibilityVersion = llvm::VersionTuple(5, 5);
     } else if (value.equals("none")) {
       runtimeCompatibilityVersion = None;
     } else {

lib/Driver/ToolChains.cpp

@@ -560,7 +560,7 @@ ToolChain::constructInvocation(const CompileJobAction &job,
                       options::OPT_disable_autolinking_runtime_compatibility)) {
     Arguments.push_back("-disable-autolinking-runtime-compatibility");
   }
-                                 
+
   if (auto arg = context.Args.getLastArg(
                                   options::OPT_runtime_compatibility_version)) {
     Arguments.push_back("-runtime-compatibility-version");
@@ -581,6 +581,9 @@ ToolChain::constructInvocation(const CompileJobAction &job,
       Arguments,
       options::
           OPT_disable_autolinking_runtime_compatibility_dynamic_replacements);
+  context.Args.AddLastArg(
+      Arguments,
+      options::OPT_disable_autolinking_runtime_compatibility_concurrency);
 
   if (context.OI.CompilerMode == OutputInfo::Mode::SingleCompile) {
     context.Args.AddLastArg(Arguments, options::OPT_emit_symbol_graph);

lib/Frontend/CompilerInvocation.cpp

@@ -1836,6 +1836,8 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
         runtimeCompatibilityVersion = llvm::VersionTuple(5, 0);
       } else if (version.equals("5.1")) {
         runtimeCompatibilityVersion = llvm::VersionTuple(5, 1);
+      } else if (version.equals("5.5")) {
+        runtimeCompatibilityVersion = llvm::VersionTuple(5, 5);
       } else {
         Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
                        versionArg->getAsString(Args), version);
@@ -1858,6 +1860,12 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
         getRuntimeCompatVersion();
   }
 
+  if (!Args.hasArg(
+          options::OPT_disable_autolinking_runtime_compatibility_concurrency)) {
+    Opts.AutolinkRuntimeCompatibilityConcurrencyLibraryVersion =
+        getRuntimeCompatVersion();
+  }
+
   if (const Arg *A = Args.getLastArg(OPT_num_threads)) {
     if (StringRef(A->getValue()).getAsInteger(10, Opts.NumThreads)) {
       Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,

lib/IRGen/GenDecl.cpp

@@ -485,6 +485,9 @@ void IRGenModule::emitSourceFile(SourceFile &SF) {
       if (libraryName == "swiftCompatibilityDynamicReplacements") {
         compatibilityVersion = IRGen.Opts.
             AutolinkRuntimeCompatibilityDynamicReplacementLibraryVersion;
+      } else if (libraryName == "swiftCompatibilityConcurrency") {
+        compatibilityVersion =
+            IRGen.Opts.AutolinkRuntimeCompatibilityConcurrencyLibraryVersion;
       } else {
         compatibilityVersion = IRGen.Opts.
             AutolinkRuntimeCompatibilityLibraryVersion;

stdlib/cmake/modules/SwiftSource.cmake

@@ -459,6 +459,7 @@ function(_compile_swift_files
   if (SWIFTFILE_IS_STDLIB OR SWIFTFILE_IS_SDK_OVERLAY)
     list(APPEND swift_flags "-runtime-compatibility-version" "none")
     list(APPEND swift_flags "-disable-autolinking-runtime-compatibility-dynamic-replacements")
+    list(APPEND swift_flags "-Xfrontend" "-disable-autolinking-runtime-compatibility-concurrency")
   endif()
 
   if (SWIFTFILE_IS_STDLIB_CORE OR SWIFTFILE_IS_SDK_OVERLAY)

stdlib/toolchain/CMakeLists.txt

@@ -54,3 +54,4 @@ add_subdirectory(legacy_layouts)
 add_subdirectory(Compatibility50)
 add_subdirectory(Compatibility51)
 add_subdirectory(CompatibilityDynamicReplacements)
+add_subdirectory(CompatibilityConcurrency)

stdlib/toolchain/CompatibilityConcurrency/CMakeLists.txt

@@ -0,0 +1,31 @@
+set(library_name "swiftCompatibilityConcurrency")
+
+add_swift_target_library("${library_name}" STATIC
+  CompatibilityConcurrency.cpp
+
+  TARGET_SDKS ${SWIFT_APPLE_PLATFORMS}
+
+  C_COMPILE_FLAGS ${CXX_COMPILE_FLAGS}
+  LINK_FLAGS ${CXX_LINK_FLAGS}
+  SWIFT_COMPILE_FLAGS ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
+  DEPLOYMENT_VERSION_OSX ${COMPATIBILITY_MINIMUM_DEPLOYMENT_VERSION_OSX}
+  DEPLOYMENT_VERSION_IOS ${COMPATIBILITY_MINIMUM_DEPLOYMENT_VERSION_IOS}
+  DEPLOYMENT_VERSION_TVOS ${COMPATIBILITY_MINIMUM_DEPLOYMENT_VERSION_TVOS}
+  DEPLOYMENT_VERSION_WATCHOS ${COMPATIBILITY_MINIMUM_DEPLOYMENT_VERSION_WATCHOS}
+
+  INSTALL_IN_COMPONENT compiler
+  INSTALL_WITH_SHARED)
+
+# FIXME: We need a more flexible mechanism to add lipo targets generated by
+# add_swift_target_library to the ALL target. Until then this hack is necessary
+# to ensure these libraries build.
+foreach(sdk ${SWIFT_SDKS})
+  set(target_name "${library_name}-${SWIFT_SDK_${sdk}_LIB_SUBDIR}")
+  if(NOT TARGET "${target_name}")
+    continue()
+  endif()
+
+  set_target_properties("${target_name}"
+    PROPERTIES
+      EXCLUDE_FROM_ALL FALSE)
+endforeach()