Use export_as for autolinking frameworks

framework module SomeKitCore {
  ...
  export_as SomeKit
}

Given the module above, while generting autolink information during
codegen, clang should to emit '-framework SomeKitCore' only if SomeKit
was not imported in the relevant TU, otherwise it should use '-framework
SomeKit' instead.

rdar://problem/38269782

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@330152 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/include/clang/Lex/ModuleMap.h b/include/clang/Lex/ModuleMap.h
index 8593fcd8b1..a34f0d845d 100644
--- a/include/clang/Lex/ModuleMap.h
+++ b/include/clang/Lex/ModuleMap.h
@@ -21,6 +21,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/PointerIntPair.h"
+#include "llvm/ADT/StringSet.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
@@ -104,7 +105,19 @@ class ModuleMap {
   /// \brief The number of modules we have created in total.
   unsigned NumCreatedModules = 0;
 
+  /// In case a module has a export_as entry, it might have a pending link
+  /// name to be determined if that module is imported.
+  llvm::StringMap<llvm::StringSet<>> PendingLinkAsModule;
+
 public:
+  /// Use PendingLinkAsModule information to mark top level link names that
+  /// are going to be replaced by export_as aliases.
+  void resolveLinkAsDependencies(Module *Mod);
+
+  /// Make module to use export_as as the link dependency name if enough
+  /// information is available or add it to a pending list otherwise.
+  void addLinkAsDependency(Module *Mod);
+
   /// \brief Flags describing the role of a module header.
   enum ModuleHeaderRole {
     /// \brief This header is normally included in the module.