Driver: Add support for a CLANGXX_IS_PRODUCTION build variable, which enable
Clang++ support, even in "Production" mode (for testing purposes).

llvm-svn: 100119
diff --git a/clang/examples/clang-interpreter/main.cpp b/clang/examples/clang-interpreter/main.cpp
index b739b71..4eaa1dd 100644
--- a/clang/examples/clang-interpreter/main.cpp
+++ b/clang/examples/clang-interpreter/main.cpp
@@ -71,7 +71,8 @@
   Diagnostic Diags(&DiagClient);
   Driver TheDriver(Path.getBasename(), Path.getDirname(),
                    llvm::sys::getHostTriple(),
-                   "a.out", /*IsProduction=*/false, Diags);
+                   "a.out", /*IsProduction=*/false, /*CXXIsProduction=*/false,
+                   Diags);
   TheDriver.setTitle("clang interpreter");
 
   // FIXME: This is a hack to try to force the driver to do something we can
diff --git a/clang/include/clang/Driver/Driver.h b/clang/include/clang/Driver/Driver.h
index 37575fc..90c3a0d 100644
--- a/clang/include/clang/Driver/Driver.h
+++ b/clang/include/clang/Driver/Driver.h
@@ -139,7 +139,8 @@
   Driver(llvm::StringRef _Name, llvm::StringRef _Dir,
          llvm::StringRef _DefaultHostTriple,
          llvm::StringRef _DefaultImageName,
-         bool IsProduction, Diagnostic &_Diags);
+         bool IsProduction, bool CXXIsProduction,
+         Diagnostic &_Diags);
   ~Driver();
 
   /// @name Accessors
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index aa55d39..921147f 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -45,7 +45,8 @@
 Driver::Driver(llvm::StringRef _Name, llvm::StringRef _Dir,
                llvm::StringRef _DefaultHostTriple,
                llvm::StringRef _DefaultImageName,
-               bool IsProduction, Diagnostic &_Diags)
+               bool IsProduction, bool CXXIsProduction,
+               Diagnostic &_Diags)
   : Opts(createDriverOptTable()), Diags(_Diags),
     Name(_Name), Dir(_Dir), DefaultHostTriple(_DefaultHostTriple),
     DefaultImageName(_DefaultImageName),
@@ -66,7 +67,8 @@
     CCCClangArchs.insert(llvm::Triple::x86_64);
     CCCClangArchs.insert(llvm::Triple::arm);
 
-    CCCUseClangCXX = false;
+    if (!CXXIsProduction)
+      CCCUseClangCXX = false;
   }
 
   // Compute the path to the resource directory.
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 935c415..7243f70 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -378,7 +378,7 @@
 
   // FIXME: We shouldn't have to pass in the path info.
   driver::Driver TheDriver("clang", "/", llvm::sys::getHostTriple(),
-                           "a.out", false, Diags);
+                           "a.out", false, false, Diags);
 
   // Don't check that inputs exist, they have been remapped.
   TheDriver.setCheckInputsExist(false);
diff --git a/clang/tools/driver/Makefile b/clang/tools/driver/Makefile
index 6434cb4..f88d229d 100644
--- a/clang/tools/driver/Makefile
+++ b/clang/tools/driver/Makefile
@@ -11,6 +11,10 @@
 TOOLNAME = clang
 ifndef CLANG_IS_PRODUCTION
 TOOLALIAS = clang++
+else
+  ifdef CLANGXX_IS_PRODUCTION
+    TOOLALIAS = clang++
+  endif
 endif
 CPP.Flags += -I$(PROJ_SRC_DIR)/../../include -I$(PROJ_OBJ_DIR)/../../include
 
@@ -33,4 +37,6 @@
 ifdef CLANG_IS_PRODUCTION
 CPP.Defines += -DCLANG_IS_PRODUCTION
 endif
-
+ifdef CLANGXX_IS_PRODUCTION
+CPP.Defines += -DCLANGXX_IS_PRODUCTION
+endif
diff --git a/clang/tools/driver/driver.cpp b/clang/tools/driver/driver.cpp
index daab519..3f1cca1 100644
--- a/clang/tools/driver/driver.cpp
+++ b/clang/tools/driver/driver.cpp
@@ -197,12 +197,19 @@
 
 #ifdef CLANG_IS_PRODUCTION
   const bool IsProduction = true;
+#  ifdef CLANGXX_IS_PRODUCTION
+  const bool CXXIsProduction = true;
+#  else
+  const bool CXXIsProduction = false;
+#  endif
 #else
   const bool IsProduction = false;
+  const bool CXXIsProduction = false;
 #endif
   Driver TheDriver(Path.getBasename(), Path.getDirname(),
                    llvm::sys::getHostTriple(),
-                   "a.out", IsProduction, Diags);
+                   "a.out", IsProduction, CXXIsProduction,
+                   Diags);
 
   // Check for ".*++" or ".*++-[^-]*" to determine if we are a C++
   // compiler. This matches things like "c++", "clang++", and "clang++-1.1".