[PATCH] Make ToolChain::SelectTool virtual.

[Douglas Katzman]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10246

Files:
  cfe/trunk/include/clang/Driver/ToolChain.h
  cfe/trunk/lib/Driver/Driver.cpp

Index: cfe/trunk/lib/Driver/Driver.cpp
===================================================================
--- cfe/trunk/lib/Driver/Driver.cpp
+++ cfe/trunk/lib/Driver/Driver.cpp
@@ -2117,13 +2117,12 @@
 }
 
 bool Driver::ShouldUseClangCompiler(const JobAction &JA) const {
-  // Check if user requested no clang, or clang doesn't understand this type (we
-  // only handle single inputs for now).
+  // Say "no" if there is not exactly one input of a type clang understands.
   if (JA.size() != 1 ||
       !types::isAcceptedByClang((*JA.begin())->getType()))
     return false;
 
-  // Otherwise make sure this is an action clang understands.
+  // And say "no" if this is not a kind of action clang understands.
   if (!isa<PreprocessJobAction>(JA) && !isa<PrecompileJobAction>(JA) &&
       !isa<CompileJobAction>(JA) && !isa<BackendJobAction>(JA))
     return false;
Index: cfe/trunk/include/clang/Driver/ToolChain.h
===================================================================
--- cfe/trunk/include/clang/Driver/ToolChain.h
+++ cfe/trunk/include/clang/Driver/ToolChain.h
@@ -164,7 +164,10 @@
   }
 
   /// Choose a tool to use to handle the action \p JA.
-  Tool *SelectTool(const JobAction &JA) const;
+  ///
+  /// This can be overridden when a particular ToolChain needs to use
+  /// a C compiler other than Clang.
+  virtual Tool *SelectTool(const JobAction &JA) const;
 
   // Helper methods

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