From 4daffc176fddbedf0950cba2efd7f64201ec468d Mon Sep 17 00:00:00 2001
From: Volodymyr Sapsai <vsapsai@apple.com>
Date: Thu, 17 Jan 2019 00:20:43 +0000
Subject: [PATCH] [Frontend] Make WrapperFrontendAction call
 WrappedAction.PrepareToExecuteAction.

Fixes `-emit-header-module` when GenerateHeaderModuleAction is wrapped
by another frontend action.

rdar://problem/47302588

Reviewers: rsmith, arphaman

Reviewed By: arphaman

Subscribers: jkorous, dexonsmith, cfe-commits

Differential Revision: https://reviews.llvm.org/D56766

llvm-svn: 351402
---
 clang/include/clang/Frontend/FrontendAction.h | 1 +
 clang/lib/Frontend/FrontendAction.cpp         | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/clang/include/clang/Frontend/FrontendAction.h b/clang/include/clang/Frontend/FrontendAction.h
index 22314386e060..530849537a37 100644
--- a/clang/include/clang/Frontend/FrontendAction.h
+++ b/clang/include/clang/Frontend/FrontendAction.h
@@ -305,6 +305,7 @@ class WrapperFrontendAction : public FrontendAction {
   std::unique_ptr<FrontendAction> WrappedAction;
 
 protected:
+  bool PrepareToExecuteAction(CompilerInstance &CI) override;
   std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
                                                  StringRef InFile) override;
   bool BeginInvocation(CompilerInstance &CI) override;
diff --git a/clang/lib/Frontend/FrontendAction.cpp b/clang/lib/Frontend/FrontendAction.cpp
index f5226380b4dd..9ab8001b002a 100644
--- a/clang/lib/Frontend/FrontendAction.cpp
+++ b/clang/lib/Frontend/FrontendAction.cpp
@@ -1045,6 +1045,9 @@ PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
   llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
 }
 
+bool WrapperFrontendAction::PrepareToExecuteAction(CompilerInstance &CI) {
+  return WrappedAction->PrepareToExecuteAction(CI);
+}
 std::unique_ptr<ASTConsumer>
 WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI,
                                          StringRef InFile) {