Implement support for module requirements, which indicate the language

features needed for a particular module to be available. This allows
mixed-language modules, where certain headers only work under some
language variants (e.g., in C++, std.tuple might only be available in
C++11 mode).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147387 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 4 deletions

diff --git a/include/clang/Lex/ModuleMap.h b/include/clang/Lex/ModuleMap.h
index 2d95255290..b017a05e97 100644
--- a/include/clang/Lex/ModuleMap.h
+++ b/include/clang/Lex/ModuleMap.h
@@ -38,8 +38,13 @@ class ModuleMapParser;
 class ModuleMap {
   SourceManager *SourceMgr;
   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> Diags;
-  LangOptions LangOpts;
-  
+  const LangOptions &LangOpts;
+
+  /// \brief Language options used to parse the module map itself.
+  ///
+  /// These are always simple C language options.
+  LangOptions MMapLangOpts;
+
   /// \brief The top-level modules that are known.
   llvm::StringMap<Module *> Modules;
   
@@ -82,7 +87,10 @@ public:
   ///
   /// \param DC A diagnostic consumer that will be cloned for use in generating
   /// diagnostics.
-  ModuleMap(FileManager &FileMgr, const DiagnosticConsumer &DC);
+  ///
+  /// \param LangOpts Language options for this translation unit.
+  ModuleMap(FileManager &FileMgr, const DiagnosticConsumer &DC,
+            const LangOptions &LangOpts);
 
   /// \brief Destroy the module map.
   ///
@@ -96,6 +104,10 @@ public:
   /// that no module owns this header file.
   Module *findModuleForHeader(const FileEntry *File);
 
+  /// \brief Determine whether the given header is part of a module
+  /// marked 'unavailable'.
+  bool isHeaderInUnavailableModule(const FileEntry *Header);
+
   /// \brief Retrieve a module with the given name.
   ///
   /// \param The name of the module to look up.
@@ -188,7 +200,7 @@ public:
 
   /// \brief Adds this header to the given module.
   void addHeader(Module *Mod, const FileEntry *Header);
-  
+
   /// \brief Parse the given module map file, and record any modules we 
   /// encounter.
   ///