Modules: Add LangOptions::CacheGeneratedPCH
Add an option to cache the generated PCH in the ModuleCache when
emitting it. This protects clients that build PCHs and read them in the
same process, allowing them to avoid race conditions between parallel
jobs the same way that Clang's implicit module build system does.
rdar://problem/48740787
llvm-svn: 355950
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 85bc281..933cc6b 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -4596,7 +4596,8 @@
ASTFileSignature ASTWriter::WriteAST(Sema &SemaRef,
const std::string &OutputFile,
Module *WritingModule, StringRef isysroot,
- bool hasErrors) {
+ bool hasErrors,
+ bool ShouldCacheASTInMemory) {
WritingAST = true;
ASTHasCompilerErrors = hasErrors;
@@ -4620,7 +4621,7 @@
this->BaseDirectory.clear();
WritingAST = false;
- if (SemaRef.Context.getLangOpts().ImplicitModules && WritingModule) {
+ if (ShouldCacheASTInMemory) {
// Construct MemoryBuffer and update buffer manager.
ModuleCache.addBuiltPCM(OutputFile,
llvm::MemoryBuffer::getMemBufferCopy(