Serialize `#pragma comment`.

`#pragma comment` was handled by Sema calling a function on ASTConsumer, and
CodeGen then implementing this function and writing things to its output.

Instead, introduce a PragmaCommentDecl AST node and hang one off the
TranslationUnitDecl for every `#pragma comment` line, and then use the regular
serialization machinery. (Since PragmaCommentDecl has codegen relevance, it's
eagerly deserialized.)

http://reviews.llvm.org/D17799

llvm-svn: 262493

1 files changed, 19 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index b98094f6656..887c53331f6 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -3689,6 +3689,25 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
     ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
     break;
 
+  case Decl::PragmaComment: {
+    const auto *PCD = cast<PragmaCommentDecl>(D);
+    switch (PCD->getCommentKind()) {
+    case PCK_Unknown:
+      llvm_unreachable("unexpected pragma comment kind");
+    case PCK_Linker:
+      AppendLinkerOptions(PCD->getArg());
+      break;
+    case PCK_Lib:
+      AddDependentLib(PCD->getArg());
+      break;
+    case PCK_Compiler:
+    case PCK_ExeStr:
+    case PCK_User:
+      break; // We ignore all of these.
+    }
+    break;
+  }
+
   case Decl::LinkageSpec:
     EmitLinkageSpec(cast<LinkageSpecDecl>(D));
     break;