[clang-cl, PCH] Support for /Yc and /Yu without filename and #pragma hdrstop

With clang-cl, when the user specifies /Yc or /Yu without a filename
the compiler uses a #pragma hdrstop in the main source file to
determine the end of the PCH. If a header is specified with /Yc or
/Yu #pragma hdrstop has no effect.

The optional #pragma hdrstop filename argument is not yet supported.

Differential Revision: https://reviews.llvm.org/D51391

llvm-svn: 341963

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index aea8106..b11581d 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -2862,6 +2862,9 @@ static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
                                   frontend::ActionKind Action) {
   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
+  Opts.PCHWithHdrStop = Args.hasArg(OPT_pch_through_hdrstop_create) ||
+                        Args.hasArg(OPT_pch_through_hdrstop_use);
+  Opts.PCHWithHdrStopCreate = Args.hasArg(OPT_pch_through_hdrstop_create);
   Opts.PCHThroughHeader = Args.getLastArgValue(OPT_pch_through_header_EQ);
   if (const Arg *A = Args.getLastArg(OPT_token_cache))
       Opts.TokenCache = A->getValue();