From f5a1854655ef102b920d800b6c2f12d01bb6f872 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 27 Oct 2010 17:24:53 +0000
Subject: Introduce libclang-level options for C++ precompiled preambles,
 separating out chaining precompiled preambles from non-chaining ones.

llvm-svn: 117457
---
 clang/lib/Frontend/ASTUnit.cpp | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

(limited to 'clang/lib/Frontend')

diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index e8e80647b40..33abb073316 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -1328,8 +1328,7 @@ bool ASTUnit::LoadFromCompilerInvocation(bool PrecompilePreamble) {
   
   
   llvm::MemoryBuffer *OverrideMainBuffer = 0;
-  // FIXME: When C++ PCH is ready, allow use of it for a precompiled preamble.
-  if (PrecompilePreamble && !Invocation->getLangOpts().CPlusPlus) {
+  if (PrecompilePreamble) {
     PreambleRebuildCounter = 1;
     OverrideMainBuffer
       = getMainBufferWithPrecompiledPreamble(*Invocation);
@@ -1386,7 +1385,9 @@ ASTUnit *ASTUnit::LoadFromCommandLine(const char **ArgBegin,
                                       bool CaptureDiagnostics,
                                       bool PrecompilePreamble,
                                       bool CompleteTranslationUnit,
-                                      bool CacheCodeCompletionResults) {
+                                      bool CacheCodeCompletionResults,
+                                      bool CXXPrecompilePreamble,
+                                      bool CXXChainedPCH) {
   bool CreatedDiagnosticsObject = false;
   
   if (!Diags.getPtr()) {
@@ -1457,6 +1458,16 @@ ASTUnit *ASTUnit::LoadFromCommandLine(const char **ArgBegin,
   // Override the resources path.
   CI->getHeaderSearchOpts().ResourceDir = ResourceFilesPath;
 
+  // Check whether we should precompile the preamble and/or use chained PCH.
+  // FIXME: This is a temporary hack while we debug C++ chained PCH.
+  if (CI->getLangOpts().CPlusPlus) {
+    PrecompilePreamble = PrecompilePreamble && CXXPrecompilePreamble;
+    
+    if (PrecompilePreamble && !CXXChainedPCH &&
+        !CI->getPreprocessorOpts().ImplicitPCHInclude.empty())
+      PrecompilePreamble = false;
+  }
+  
   // Create the AST unit.
   llvm::OwningPtr<ASTUnit> AST;
   AST.reset(new ASTUnit(false));
-- 
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